Sensor laser welding equipment

Abstract

The utility model discloses sensor laser welding equipment, which belongs to the technical field of sensor packaging and comprises a clamping mechanism for clamping a sensor shell, a laser welding head for welding and sealing a gap of the sensor shell, and a moving mechanism for driving the laser welding head to move relative to the gap of the shell, and the cooling mechanism is used for cooling two sides of the gap on the sensor shell. According to the sensor laser welding device, the cooling mechanisms arranged along the two sides of the welding seam are arranged and used for cooling the sensor, heat accumulation in a sensor shell is reduced by taking away heat in the welding process in time, welding can be continuously carried out with higher power, and therefore the welding efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sensor packaging, and also to the technical field of welding, especially the technical field of laser welding, and specifically is a sensor laser welding device, which is used for welding a shell containing electronic components inside to achieve sealed packaging. Background Art

[0002] A sensor is a device that receives signals or stimuli and responds. It is used to convert the physical or chemical quantity to be measured into another corresponding output. There are many types of sensors, such as pressure sensors, temperature sensors, humidity sensors, etc. Generally speaking, a sensor includes a probe and an electronic component. The probe is in contact with the object to be measured, and the electronic component is electrically connected to the probe to convert and transmit the captured signal. In order to prevent the electronic components from being affected by the external environment, it is usually necessary to set up a shell to seal the electronic components. For example, an automobile exhaust sensor encapsulates the circuit part in the shell. Such a packaging setting can isolate the electronic components from the atmosphere and reduce the impact of water and dust in the atmosphere on its measurement. This setting is particularly common for sensors operating outdoors.

[0003] The packaging of sensors is usually achieved by welding. However, the welding process involves the melting of welding materials, which results in high temperatures. High temperatures can easily cause thermal damage to electronic components in the housing. In view of this, people usually use laser welding, which has more concentrated heat and a relatively small heat-affected range, for intermittent welding or low-power operation to avoid excessive heat accumulation in the housing that may cause damage to electronic components. However, this affects the welding rate and reduces manufacturing efficiency. Utility Model Content

[0004] In order to solve the above problems, the utility model provides a sensor laser welding device. The device is provided with cooling facilities arranged along both sides of the weld to cool the sensor. The heat accumulated in the sensor housing is reduced by timely removing the heat during the welding process, so that welding can be carried out continuously at a higher power, thereby improving the welding efficiency.

[0005] The specific scheme of the utility model is as follows:

[0006] A sensor laser welding device, comprising:

[0007] A clamping mechanism, used for clamping the sensor housing;

[0008] Laser welding head, used to weld and seal the gap of the sensor housing;

[0009] A moving mechanism, used for driving the laser welding head to move relative to the gap of the housing;

[0010] The cooling mechanism is used to cool both sides of the gap on the sensor housing.

[0011] As a specific implementation of the utility model, the cooling mechanism includes:

[0012] Two hollow baffles, which are respectively arranged on both sides of the gap of the outer wall of the shell, and the inner ring wall of the hollow baffle is closely connected with the outer wall of the shell;

[0013] A spray structure for spraying a cryogenic fluid onto the outer wall of the housing located outside the two hollow baffles;

[0014] The liquid collector located below the shell is used to collect the low-temperature fluid sprayed by the spray structure.

[0015] Furthermore, a high temperature resistant sealing ring is arranged on the inner ring wall surface of the hollow baffle.

[0016] As a specific embodiment of the utility model, the cooling mechanism also includes a second baffle, which has two pieces and is also a hollow structure. The two second baffles are respectively located on the outside of the two hollow baffles and are sealed with the outer wall of the shell. The low-temperature fluid sprayed by the spray structure is located between the hollow baffle and the second baffle.

[0017] As a specific embodiment of the utility model, the moving mechanism is the rotating shaft of the motor, and the clamping mechanism is a chuck for clamping the shell. The chuck is coaxially fixedly connected to the rotating shaft of the motor, so that the shell can be driven to rotate by the motor. The laser welding head is suspended by a bracket, and the nozzle of the laser welding head is facing the gap of the shell.

[0018] Compared with the existing technology, it has the following advantages:

[0019] The sensor laser welding device of the utility model is provided with a cooling mechanism arranged along both sides of the weld to cool the sensor. The heat accumulated in the sensor housing is reduced by timely removing the heat during the welding process, so that the welding can be carried out continuously at a higher power, thereby improving the welding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of an automobile sensor in the prior art;

[0021] Figure 2 It is a structural schematic diagram of a specific embodiment of the sensor laser welding equipment of the utility model;

[0022] Figure 3 for Figure 2 Schematic diagram of the structure of the hollow baffle;

[0023] Figure 4 It is a structural schematic diagram of another specific embodiment of the sensor laser welding device of the utility model;

[0024] In the figure, a clamping mechanism 100; a laser welding head 200; a moving mechanism 300; a cooling mechanism 400; a housing 500;

[0025] Spray structure 410; hollow baffle 420; liquid collector 430; second baffle 440;

[0026] Sealing ring 421. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below in conjunction with the embodiments and drawings, but the implementation manner of the present invention is not limited thereto.

[0028] The sensor laser welding equipment of the utility model is mainly used for welding the outer shell of the sensor. In order to facilitate the understanding of the specific scheme of the utility model, the structure of the sensor is explained here, please refer to Figure 1 , which shows an existing automotive sensor, which includes a probe, an electronic component and a housing. The housing is used to seal and package the electronic component to isolate it from the atmosphere and reduce the influence of water and dust on its measurement. The sensor laser welding equipment of the utility model is mainly used to weld the gap on the housing. The specific shape of the gap is related to the shape of the housing, such as Figure 1 In the structure shown, the shell is divided into two parts, namely part A and part B, which are connected by threads. The connection point is a gap C that needs to be welded and sealed. It can be seen from the figure that the gap C is located on the circumferential side of the shell and is in a circular ring shape. During installation, the electronic components are in contact with both ends of the shell. In particular, it is necessary to avoid contact between the electronic components and the corresponding inner walls of the shell gap to avoid damage to the electronic components due to high temperature during welding. However, there is heat transfer during welding, and the heat will be transferred along the shell, thereby increasing the temperature inside the shell. When in use, the temperature inside the shell can only be controlled by reducing the welding rate, such as intermittent welding, such as low-power welding.

[0029] Example

[0030] Please refer to Figure 2 to Figure 4 , which shows the structure of two specific embodiments of the sensor laser welding device of the utility model, the sensor laser welding device of the utility model comprises a clamping mechanism 100, a laser welding head 200, a moving mechanism 300 and a cooling mechanism 400, wherein the clamping mechanism 100 is used to clamp the sensor housing 500, the housing 500 is as Figure 1As shown, the gap to be welded is located on the circumferential side wall, the laser welding head 200 is used to weld and seal the gap of the sensor housing 400, the moving mechanism 300 is used to drive the laser welding head 200 to move (rotate) relative to the gap of the housing 500, so as to weld the gap of the housing 500, and the cooling mechanism 400 is used to cool both sides of the gap on the housing 500, so as to remove the heat in the welding process in time and reduce the heat accumulation in the housing 500, so that the welding can be carried out continuously at a higher power (without having to operate at a low power or a high power intermittent operation), thereby improving the welding efficiency.

[0031] The clamping mechanism 100, the laser welding head 200, and the moving mechanism 300 of the present invention are all conventional devices in the prior art. For example, in some embodiments, Figure 1 As shown, the motor shaft is used as the moving mechanism 300, and the chuck is used as the clamping mechanism 100 to fix the shell 500. The chuck is coaxially fixedly connected with the motor shaft, so that the shell 500 can be driven to rotate by the motor, and the laser welding head 200 is suspended by a bracket (not shown in the figure). When in use, the laser welding head 200 is stationary, and the shell 500 is rotated by the moving mechanism 300. During the rotation, the nozzle of the laser welding head 200 is facing the gap of the shell 500, so as to weld the gap.

[0032] The cooling mechanism 400 of the present invention can be specifically arranged in a variety of ways. In some embodiments, for example, Figure 2 As shown, the cooling mechanism 400 includes a spray structure 410, a hollow baffle 420 and a liquid collector 430, wherein there are two hollow baffles 420, and the two hollow baffles 420 are respectively arranged on both sides of the gap of the outer wall of the outer shell 500, and the inner ring wall of the hollow baffle 420 is sealed to the outer wall of the outer shell 500. In order to enhance the sealing effect, in some embodiments, a high-temperature resistant sealing ring 421 is arranged on the inner ring wall surface of the hollow baffle 420, and the spray structure 410 is used to spray low-temperature fluid, such as normal temperature water, to the outer wall of the shell outside the two hollow baffles 420 so as to remove the heat of the outer shell 500. The liquid collector 430 is located below the outer shell 500, and is used to collect the low-temperature fluid sprayed by the spray structure 410. In the present invention, one function of the hollow baffle 420 is to shield the cryogenic fluid from entering the welding gap and affecting the welding quality. In addition, in order to prevent the cryogenic fluid from moving axially (flowing horizontally) along the housing 500 and falling outside the liquid collector 430, in some embodiments, such as Figure 4As shown, a second baffle 440 is also provided. There are two second baffles 440 and they are also hollow structures. The two second baffles 440 are respectively located on the outsides of the two hollow baffles 420 and are sealed to the outer wall of the shell 500. The low-temperature fluid sprayed from the spray structure 410 is located between the hollow baffle 410 and the second baffle 440 (away from the gaps that need to be welded and the two ends of the shell), thereby limiting the horizontal flow range of the low-temperature fluid.

[0033] The above is only a preferred specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the embodiments of the present invention should be covered within the protection scope of the present invention.

Claims

1. A sensor laser welding device, characterized in that: include: A clamping mechanism, used for clamping a housing of the sensor; A laser welding head, used for welding and sealing the gap of the shell; A moving mechanism, used for driving the laser welding head to move relative to the gap of the housing; A cooling mechanism, used for cooling both sides of the gap on the shell; The cooling mechanism comprises: Two hollow baffles, which are respectively arranged on both sides of the gap of the outer wall of the shell, and the inner ring wall of the hollow baffle is sealed and connected to the outer wall of the shell; A spray structure for spraying a cryogenic fluid onto the outer wall of the housing located outside the two hollow baffles; The liquid collector located below the shell is used to collect the low-temperature fluid sprayed by the spray structure.

2. A sensor laser welding device according to claim 1, characterized in that: A high temperature resistant sealing ring is arranged on the inner ring wall surface of the hollow baffle.

3. A sensor laser welding device according to claim 1, characterized in that: The cooling mechanism also includes a second baffle, which has two pieces and both are hollow structures. The two second baffles are respectively located on the outside of the two hollow baffles and are sealed to the outer wall of the shell. The low-temperature fluid sprayed by the spray structure is located between the hollow baffle and the second baffle.

4. A sensor laser welding device according to claim 1, characterized in that: The moving mechanism is the rotating shaft of the motor, and the clamping mechanism is a chuck for clamping the shell. The chuck is coaxially fixedly connected to the rotating shaft of the motor, so that the shell can be driven to rotate by the motor. The laser welding head is suspended by a bracket, and the nozzle of the laser welding head is facing the gap of the shell.

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