A rotatable laser welding fixture for sensor packaging

Abstract

The present invention discloses a laser welding fixture for sensor packaging, which belongs to the field of laser welding. The invention includes a set of pre-tightening fixtures, a rotating drive mechanism and a base; the pre-tightening fixture includes an up-and-down moving mechanism, a self-locking mechanism, a standard force sensor and an upper fixture, the upper fixture is installed on the standard sensor, the up-and-down moving mechanism is connected to the standard force sensor through a bearing frame, and drives the sensor and the upper fixture to move; the rotating drive mechanism includes a stepper motor and a lower fixture, the stepper motor is installed on the stepper motor bracket, the motor bracket is installed on the base, the lower fixture is connected to the stepper motor, and the motor drives the workbench to rotate; in the present invention, through the setting of the standard force sensor and the stepper motor, the packaging mechanism can achieve 360° rotation and controllable speed, and the target of the pre-tightening force can be freely set. The fixture has a simple structure and is easy to install, while improving welding efficiency and welding quality.

Description

Technical Field

[0001] The invention relates to the technical field of laser welding, in particular to a laser welding fixture for sensor packaging with high requirements for dimensional accuracy and preload accuracy. Background Art

[0002] Sensors are important tools for engineering systems to obtain accurate and reliable external environmental information. They can be used to detect and control various parameters in the production process and play an important role in industrial production and other fields. However, the working environment of the sensor will affect the sensitive components and cause deviations in the measurement data. Sensor packaging is an important way to protect sensitive components from external factors.

[0003] Laser welding is a new type of welding technology, which has the characteristics of heat concentration, high welding precision and high degree of automation. It is widely used in the packaging of special components. During the welding process, adjusting parameters such as current, pulse width, frequency and scanning speed can improve the welding quality.

[0004] Chinese Patent 202011530771.3 discloses a sensor laser welding device, whose structure includes a frame, a feeding component, a pre-clamping component, a moving component, a positioning component, a welding component and a receiving component. The device performs three-point pre-clamping on the capillary and the blind cover before welding through the setting of the pre-clamping component to prevent the blind cover from moving in the capillary during welding. The various workstations are closely combined to achieve highly integrated automated production with high production efficiency. However, during the welding process, the workpiece to be welded cannot rotate and the pre-tightening force cannot be detected; Patent 202011489445.2 discloses a laser welding fixture and a laser welding system, whose structure is rotated from top to bottom once. Driving machine, internal expansion clamping mechanism, anti-splash mechanism and base. The fixture has a simple structure and is easy to install. During the welding process, the workpiece to be welded can rotate and rise and fall with the workbench. It is suitable for welding workpieces with different shapes, but the preload force cannot be accurately displayed during the welding process; Chinese Patent 202010834779.2 discloses a laser welding fixture, whose structure includes a workbench, a moving mechanism, two clamping mechanisms and two buffer mechanisms. The laser welding fixture can adjust the fixing part and the adjusting rod to change the length, but the welded part cannot rotate during welding and the preload force cannot be displayed. For precision products such as sensors, the value of the preload force will have a certain impact on the performance of the sensor. Summary of the invention

[0005] Therefore, the purpose of the present invention is to overcome the defects of the above-mentioned laser welding fixture and provide a welding fixture that can be used for welding a variety of sensors. The fixture can be adapted to a variety of laser welding systems, is suitable for sensor welding packages with diameters between 5mm and 30mm, and can load a numerically controllable preload on the sensor.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a laser welding fixture for sensor packaging, whose structure from top to bottom is a lifting mechanism 3, a preload detection mechanism 2, a rotation drive mechanism 1 and a base 4, the rotation drive mechanism 1 includes a No. 1 screw group 101, a stepper motor bracket 102, a No. 1 bolt group 103, a lower shaft 104, an adapter 105 and a stepper motor 106, the preload detection mechanism 2 includes an upper fixture 201, a standard force measuring The sensor 202, the No. 1 bearing frame 203, the bearing 204, the upper rotating shaft 205 and the No. 2 bolt group 206, the lifting mechanism 3 includes a screw 301, a left outer shell 302, a screw nut 303, a No. 3 bolt group 304, a No. 2 bearing frame 305, a turntable 306, a No. 4 bolt group 307, a worm 308, a worm wheel 309, a bearing seat group 310, a lifting platform 311, a guide rod 312, a No. 3 bearing frame 313, a right outer shell 314 and a No. 2 screw group 315.

[0007] As a further limitation of the technical solution, the turntable 306 is connected to the worm 308, driving the worm wheel 309 to rotate, the worm wheel 309 is installed at the upper end of the screw 301, the screw nut 303 cooperates with the screw 301, and the screw nut 303 is fixed to the lifting platform 311 using the No. 3 bolt group 304. When the screw 301 rotates, the screw nut 303 and the lifting platform 311 can move up and down at the same time, the No. 1 bearing frame 203 is installed on the lifting platform 311, the bearing 204 is installed below the No. 1 bearing frame 203, the upper rotating shaft 205 cooperates with the bearing 204, and the standard force sensor 202 is installed on At the lower end of the upper rotating shaft 205, the upper clamp 201 is installed at the lower end of the standard force sensor 202, the adapter 105 is installed at the upper end of the lower rotating shaft 104, the lower end of the lower rotating shaft 104 is connected to the stepper motor 106, the stepper motor 106 is fixed to the stepper motor bracket 102 by the No. 1 bolt group 103, and the stepper motor bracket 102 is fixed to the base 4 by the No. 1 bolt group 101; the No. 2 screw group 315 fixes the left outer shell 302 and the right outer shell 314 on both sides of the No. 2 bearing frame 305 and the No. 3 bearing frame 313, and the space formed on the front side can act as a guide groove to limit the rotation of the lifting platform 304.

[0008] As a further limitation of the present technical solution, the transmission system composed of the worm wheel 309 and the worm 308 has a self-locking function. When the connecting block reaches the specified position and the preload force is applied, even if the turntable 306 is released, the lifting platform 311 will not be displaced or change the size of the preload force under the action of the reverse force, thereby ensuring the consistency of the weld quality and sensor sensitivity; the rotary drive mechanism uses a single-chip microcomputer to control the motion control of the stepper motor 106, driving the movement of the lower shaft 104 and the adapter 105, realizing the forward rotation, reverse rotation, uniform rotation and accelerated rotation of the sensor to be welded, so as to achieve the goal of improving the welding quality and welding efficiency; the base 4 is in the shape of the letter "L", which can realize the horizontal and vertical installation modes of the laser welding preload device, and the base 4 can be flexibly adapted to various laser welding instruments, and laser welding packaging is performed for sensors of different shapes; the rotary drive mechanism includes an adapter 104, and by changing the specifications of the adapter 104, the welding fixture can be flexibly adapted to sensors with a diameter between 5mm and 30mm, and has a wide range of uses.

[0009] As a further limitation of the technical solution, the device is fixed on a laser welding workbench, and adapters 105 of different sizes are replaced according to the size of the sensor to be welded. The position of the upper clamp 201 is adjusted using the turntable 306, and the preload force is adjusted according to the output of the standard force sensor 202. The welding speed is adjusted by controlling the rotation speed of the stepper motor 106.

[0010] Compared with the prior art, the advantages and positive effects of the present invention are as follows: 1. The laser welding fixture of the present invention uses an upper and lower fixture to fix the sensor to be welded, and a standard force sensor is installed above the upper fixture, which can accurately display the size of the preload force, realize the controllable preload force during welding, improve welding quality, and reduce the influence of the preload force deviation on the sensor accuracy and sensitivity;

[0011] 2 The laser welding fixture of the present invention includes a rotary drive mechanism, which can control the direction and rotation speed of the sensor to be welded, thereby improving welding efficiency and welding quality;

[0012] 3 The base of the laser welding fixture of the present invention is "L" shaped, which can be used for both sitting and standing, and is flexibly adapted to a variety of laser welding systems;

[0013] 4 The laser welding fixture of the present invention can replace adapters of different sizes, and is suitable for sensors or other cylindrical parts to be welded with a diameter of 5mm to 30mm, and has a wide range of uses. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 The figure is a schematic diagram of the overall structure of a laser welding fixture for sensor packaging in one embodiment of the present invention.

[0016] Figure 2 The figure is a schematic structural diagram of a rotation driving mechanism of a laser welding fixture for sensor packaging in one embodiment of the present invention.

[0017] Figure 3 It is a structural schematic diagram of a preload force detection mechanism of a laser welding fixture for sensor packaging in one embodiment of the present invention.

[0018] Figure 4 The figure is a schematic structural diagram of a lifting mechanism of a laser welding fixture for sensor packaging in one embodiment of the present invention.

[0019] Numbers in the figure: rotation drive mechanism 1, preload force detection mechanism 2, lifting mechanism 3, base 4, No. 1 screw group 101, stepper motor bracket 102, No. 1 bolt group 103, lower shaft 104, adapter 105, stepper motor 106, upper fixture 201, standard force sensor 202, No. 1 bearing frame 203, bearing 204, upper shaft 205, No. 2 bolt group 206, screw 301, left housing 302, screw nut 303, No. 3 bolt group 304, No. 2 bearing frame 305, turntable 306, No. 4 bolt group 307, worm 308, worm wheel 309, bearing seat group 310, lifting platform 311, guide rod 312, No. 3 bearing frame 313, right housing 314, No. 2 screw group 315. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0022] like Figure 1 As shown, the laser welding fixture for sensor packaging of the present invention includes a rotation drive mechanism 1, a preload force detection mechanism 2, a lifting mechanism 3 and a base 4.

[0023] like Figure 2 As shown, the rotary drive mechanism 1 described in the present invention includes a No. 1 screw group 101, a stepper motor bracket 102, a No. 1 bolt group 103, a lower rotating shaft 104, an adapter 105 and a stepper motor 106.

[0024] The No. 1 screw group 101 fixes the stepper motor bracket 102 on the base 4, and the No. 1 bolt group 103 fixes the stepper motor 106 on the stepper motor bracket 102. The output shaft of the stepper motor 106 is connected to the lower rotating shaft 104, and the adapter 105 is installed on the upper end of the lower rotating shaft 104. The adapter 105 is used to install the sensor to be welded, and its size is determined by the sensor to be welded. The size of the adapter 104 can be changed, but the sensor packaging laser welding fixture can be flexibly adapted to sensors of various sizes to be welded.

[0025] like Figure 3 As shown, the preload force detection mechanism 2 of the present invention includes an upper fixture 201, a standard force sensor 2002, a No. 1 bearing frame 203, a bearing 204, an upper rotating shaft 205 and a No. 2 bolt group 206.

[0026] The upper clamp 201 is used to fix the sensor to be welded. The standard force sensor 202 can output the preload force value of the sensor to be welded in real time. The preload force can be adjusted by adjusting the position of the upper clamp 201 to achieve precise control of the preload force. The No. 2 bolt group 206 is used to connect the No. 1 bearing frame 203 and the lifting platform 304.

[0027] like Figure 4 As shown, the lifting mechanism 3 described in the present invention includes a screw 301, a left housing 302, a screw nut 303, a No. 3 bolt group 304, a No. 2 bearing frame 305, a turntable 306, a No. 4 bolt group 307, a worm 308, a worm wheel 309, a bearing seat group, a lifting platform 311, a guide rod 312, a No. 3 bearing frame 313, a right housing 314, and a No. 2 screw group 315.

[0028] The transmission system composed of the worm 308 and the worm wheel 309 has a self-locking function, which can ensure that the preload force is stable during the welding process, ensure the welding quality, and reduce the influence of the preload force error on the sensitivity of the sensor.

[0029] Figures 1 to 4 As shown, one embodiment of the laser welding fixture for sensor packaging described in the present invention includes a rotary drive mechanism 1, a preload detection mechanism 2, a lifting mechanism 3 and a base 4; the lifting mechanism 3 is used to adjust the position of the upper fixture 201 and fix the sensor to be welded. The preload detection mechanism can output the value of the preload applied to the sensor to be welded in real time. By adjusting the turntable 306, the preload size can be adjusted, the preload value of the welding process can be accurately controlled, and the sensitivity of the sensor to be welded can be improved. The rotary drive mechanism 1 is used to drive the sensor to be welded to achieve 360° rotation of the sensor to be welded, and its speed is adjustable, thereby improving welding quality and welding efficiency. The base 4 plays a supporting and fixing role. The transmission system composed of the worm 308 and the worm wheel 309 has a self-locking function, which can achieve a stable preload size during welding, ensure welding quality, and reduce the influence of preload error on sensor sensitivity.

[0030] The above description of the figure is not a limitation of the present invention, and the present invention is not limited to the above examples. The above-mentioned specific implementation methods further explain the purpose, technical scheme and beneficial effects of the present invention in detail. It should be understood that all modifications, replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A laser welding fixture for sensor packaging, comprising a rotary drive mechanism (1), a preload force detection mechanism (2), a lifting mechanism (3) and a base (4); wherein: The rotating drive mechanism (1) comprises a No. 1 screw group (101), a stepper motor bracket (102), a No. 1 bolt group (103), a lower rotating shaft (104), an adapter (105) and a stepper motor (106); the preload force detection mechanism (2) comprises an upper clamp (201), a standard force sensor (202), a No. 1 bearing frame (203), a bearing (204), an upper rotating shaft (205) and a No. 2 bolt group (206); the lifting mechanism (3) comprises a lead screw (301), a left housing (302), a lead screw nut (303), a No. 3 bolt group (304), a No. 2 bearing frame (305), a rotating disk (306), a No. 4 bolt group (30 7), a worm (308), a worm wheel (309), a bearing seat assembly (310), a lifting platform (311), a guide rod (312), a No. 3 bearing frame (313), a right housing (314) and a No. 2 screw assembly (315); the turntable (306) is connected to the worm (308) to drive the worm wheel (309) to rotate, the worm wheel (309) is installed on the upper end of the lead screw (301), the lead screw nut (303) cooperates with the lead screw (301), and the lead screw nut (303) is fixed on the lifting platform (311) using the No. 3 bolt assembly (304). When the lead screw (301) rotates, the lead screw nut (303) and the lifting platform (311) can move up and down at the same time; the No. 1 bearing frame (2 03) is installed on the lifting platform (311), the bearing (204) is installed below the No. 1 bearing frame (203), the upper rotating shaft (205) cooperates with the bearing (204), the standard force sensor (202) is installed at the lower end of the upper rotating shaft (205), and the upper clamp (201) is installed at the lower end of the standard force sensor (202); the adapter (105) is installed at the upper end of the lower rotating shaft (104), the lower end of the lower rotating shaft (104) is connected to the stepper motor (106), the stepper motor (106) is fixed to the stepper motor bracket (102) by the No. 1 bolt group (103), and the stepper motor bracket (102) is fixed to the base (4) by the No. 1 screw group (101); the No. 2 screw The nail group (315) fixes the left shell (302) and the right shell (314) on both sides of the second bearing frame (305) and the third bearing frame (313), and the space formed on the front side can act as a guide groove to limit the rotation of the lifting platform (311); the base (4) is in the shape of the letter "L", which can realize the horizontal and vertical installation modes of the laser welding preload device, and the base (4) can be flexibly adapted to various laser welding instruments, and laser welding packaging can be performed for sensors with different shapes; the rotating drive mechanism includes an adapter (105), and by changing the specifications of the adapter (105), the welding fixture can be flexibly adapted to sensors with diameters between 5 mm and 30 mm, and has a wide range of uses.

2. A laser welding fixture for sensor packaging according to claim 1, characterized in that: The transmission system composed of the worm wheel (309) and the worm (308) has a self-locking function. When the connecting block reaches the specified position and the pre-tightening force is applied, even if the turntable (306) is loosened, the lifting platform (311) will not be displaced or change the size of the pre-tightening force under the action of the reverse force, thereby ensuring the consistency of the weld quality and sensor sensitivity; the rotary drive mechanism drives the movement of the lower rotating shaft (104) and the adapter (105) by controlling the movement of the stepping motor (106), thereby realizing the forward rotation, reverse rotation, uniform rotation and accelerated rotation of the sensor to be welded, thereby achieving the goal of improving the welding quality and welding efficiency.

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