A two-dimensional laser scanning device

Abstract

The utility model discloses a two-dimensional laser scanning device, which belongs to laser application technology. The device includes a laser guiding module, a polarization module and a field lens module; the laser guiding module is connected to a laser generator, and is used to convert the laser into parallel light; the polarization module includes a reflective lens and a polarization motor, and the parallel light transmitted by the laser guiding module is reflected to the scene module through the reflective lens; the scene module realizes the focusing of the laser beam after being reflected by the polarization module. The cooling system of the utility model includes a water cooling pipeline and a semiconductor heat dissipation component. The semiconductor heat dissipation component includes a temperature control module and a cooling block, and a semiconductor cooling sheet is attached to the cooling block, and the semiconductor cooling sheet is connected to the water cooling pipeline through a connector to realize heat dissipation. The utility model has efficient heat dissipation.

Description

Technical Field

[0001] The utility model belongs to laser application technology, and specifically relates to a two-dimensional laser scanning device. Background Art

[0002] The galvanometer is a special swing motor, but unlike the rotary motor, its rotor cannot rotate like an ordinary motor but can only deflect. The deflection angle is proportional to the current, similar to the galvanometer, so the galvanometer is also called a galvanometer scanner. Because it is used for optical path switching in some double-beam spectrophotometers, the speed is extremely fast. When working, the stepping action looks like high-speed vibration, so it is named a galvanometer.

[0003] The more mature application of galvanometer is laser scanning. The laser galvanometer consists of an optical scanning head, an electronic drive amplifier and an optical reflective lens. It reflects the laser on the XY plane by two galvanometers. It is a special motion device specially used in the field of laser processing. The scanning galvanometer system is a closed-loop control system composed of a processor, a power amplifier, a galvanometer motor, a photoelectric sensor, and a signal demodulator. The two form a high-precision, high-speed servo control system. The two galvanometers rotate or vibrate, and the galvanometer control system is matched, so that the laser beam can move in different directions and focus to different positions to achieve precise marking, cutting or engraving. The galvanometer and control system can realize the positioning of the laser beam on the surface of the workpiece and guide it along a predetermined path, so that the laser beam can move on the surface of the workpiece at a very high speed, and can also accurately control the path and speed of the laser beam to achieve complex patterns, text or graphic markings. It can also be used to adjust the focal length of the laser beam to ensure clear marking on the surface of the workpiece at different heights, and can also achieve marking of different shapes and surfaces on three-dimensional objects by using multiple galvanometers.

[0004] Traditional laser galvanometers are mostly water-cooled. First, the water vapor pollution control during the heat dissipation process is insufficient, and the heat dissipation effect needs to be improved. Second, the astigmatism processing machine is insufficiently controlled during the propagation of the light beam. Some scattered light is diffusely reflected in the internal space of the galvanometer. If it splashes onto the electronic parts of the temperature control module, it is very easy to cause damage. Utility Model Content

[0005] Purpose of the utility model: In view of the deficiencies of the above-mentioned prior art, the utility model aims to provide a two-dimensional laser scanning device.

[0006] Technical solution: A two-dimensional laser scanning device, which includes a laser guiding module, a polarization module and a field lens module; the laser guiding module is connected to a laser generator and is used to convert laser light into parallel light; the polarization module includes a reflective lens and a polarization motor, and the parallel light transmitted by the laser guiding module is reflected to the field lens module through the reflective lens; the field lens module realizes focusing of the laser beam after being reflected by the polarization module.

[0007] Furthermore, the device is provided with a cooling system, and the cooling system includes a water cooling pipeline and a semiconductor heat dissipation component;

[0008] The semiconductor heat dissipation component includes a temperature control module and a cooling block, on which a semiconductor cooling sheet is attached, and the semiconductor cooling sheet is connected to a water cooling pipeline via a connector to achieve heat dissipation.

[0009] Preferably, the polarization module and the field lens module are integrated in a box body, the polarization module is located in the box body, and the field lens module is arranged through a field lens mounting plate at the bottom of the box body, including a field lens assembly.

[0010] Furthermore, the middle part of the box body is divided into an upper cavity and a lower cavity by a partition, the reflective lens is located in the lower cavity, and the connector in the upper cavity connected to the cooling block penetrates the upper box body to achieve heat dissipation;

[0011] The upper cavity and the lower cavity are correspondingly provided with an upper box body and a lower box body.

[0012] The partition is provided with air circulation holes inclined at 45 degrees.

[0013] Furthermore, the polarization module of the device includes horizontally arranged and vertically arranged polarization motors, and the output shaft of the polarization motor is provided with a reflective lens, thereby forming a 2D galvanometer structure.

[0014] Furthermore, a drying box for absorbing moisture is arranged in the upper box body, and a desiccant is placed in the drying box.

[0015] The upper box body is provided with a fan for promoting the flow of air.

[0016] The device includes an air knife.

[0017] Furthermore, the laser guiding module includes a collimating beam expander lens group, and the laser connection port adopts a QBH or QD laser connector.

[0018] Beneficial effects: Compared with the traditional laser galvanometer, the utility model realizes the integration of polarization module and field lens module through the box body, and the box body is separated by the partition, which can avoid the influence of astigmatism on the electronic components and controller in the upper box body. The openings on the partition do not affect the flow of air, including the setting of fans to promote the flow of air. For the cooling system, the utility model adopts the combination of water cooling pipeline and semiconductor heat dissipation component to realize double heat dissipation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the external structure of the utility model;

[0020] Figure 2 This is the assembly drawing after the upper box body is disassembled;

[0021] Figure 3 It is a schematic diagram of the structure after the upper box body and the lower box body are removed;

[0022] Figure 4 It is a schematic diagram of the internal structure of the polarization module and the field lens module;

[0023] Figure 5 1 is a schematic diagram of the structure of the lower box body;

[0024] Figure 6 It is a perspective structural diagram of the utility model. DETAILED DESCRIPTION

[0025] The utility model provides a two-dimensional laser scanning device, also known as a 2D galvanometer, which can realize a 6KW high-power two-dimensional galvanometer. It has the advantages of small size, high power and high precision, and is suitable for battery processing, laser rust removal and other occasions.

[0026] Combination Figure 1-6 As shown, the technical solution disclosed by the utility model is specifically introduced. Figure 1 As shown, the two-dimensional laser scanning device described in the utility model mainly includes:

[0027] Laser guide module 1, the laser guide module is compatible with mainstream QBH and QD laser connectors. The connector can be replaced according to needs. This module is responsible for guiding the laser entering the module and converting it into parallel light output. The laser guide module 1 includes a collimating beam expander group, and the laser entrance adopts a QBH standard interface.

[0028] Polarization module 2, composed of horizontally and vertically arranged polarization motors 207 and high-power reflective lenses 211. The laser is converted into parallel light by the laser guide module 1 and output to the polarization module, and then enters the field lens module 3 after being reflected by the double reflective lenses 211;

[0029] The field lens module 3 focuses the parallel laser beam into a laser, and realizes high-speed movement of the laser in a two-dimensional (2D) plane. The field lens module 3 can be freely replaced, and the specifications of the field lens group determine the movement range of the laser in the two-dimensional plane.

[0030] The air knife 4 can be connected to an air pump to blow out strong and high-speed airflow to remove dust, dry welding slag, and cool down.

[0031] The cooling system is mainly used for heat dissipation of the polarization motor 207 in the polarization module 2 , and also includes heat dissipation of components of the laser guiding module 1 and the field lens module 3 .

[0032] It is further pointed out that since the polarization module 2 is a mechanical structure in high-speed motion, it will generate a large amount of heat during operation, and a small amount of energy will be dissipated into the air and absorbed by the lens during the reflection of the laser through the reflective lens 211 in the polarization module 2. As a result, after the traditional galvanometer product has been working for a period of time, the internal temperature of the galvanometer increases, and the temperature of the reflective lens 211 increases. In response to the increase in the internal temperature of the 2D galvanometer, the current solution on the market is to process a cooling water channel on the galvanometer housing to take away the heat inside the galvanometer through the flow of the water channel. Although this method provides a heat dissipation pathway, the heat dissipation efficiency is low, and the internal temperature of the galvanometer is still in a relatively high state. If the lens works for a long time in this high temperature state, the lens itself will produce slight deformation, resulting in the reflected laser being not in line with expectations on the plane, that is, the processing accuracy is reduced. This phenomenon is called temperature drift.

[0033] In the laser scanning device described in the utility model, Figure 2-4 The polarization module 2 and the field lens module 3 are integrated through a box body. The polarization module 2 is located in the box body. The box body includes an upper box body 201 and a lower box body 202, which are separated by a partition 203. The upper box body 201 corresponds to an upper cavity, which is used to install and set electronic components including a polarization control motor 207 and an electronic drive amplifier module 208. A reflective lens 211 is arranged in the lower cavity. The reflective lens 211 is controlled by the polarization motor 207. The polarization motor 207 in the vertical direction can be installed based on the polarization motor mounting block 212 on the lower box body 202 ( Figure 5 ), the polarization motor 207 in the horizontal direction can be installed based on the partition 203. The polarization motor 207 will generate heat when running at high speed. The tail of the polarization motor 207 in the vertical direction passes through the partition 203 and is located in the upper cavity. The polarization motor 207 in the horizontal direction can rely on the partition 203 (metal material) to achieve transmission and heat dissipation. It can be seen that the heat in the upper cavity is relatively high. For this reason, the utility model sets a semiconductor heat dissipation component in the upper cavity. At the bottom of the lower box body 202, a field lens group 302 is set through a field lens mounting plate 301. The field lens group 302 is mainly used for focusing.

[0034] For heat dissipation, both the upper cavity and the lower cavity will generate heat. Therefore, the device described in the utility model is provided with a cooling system inside, including a water cooling pipeline 5 and a semiconductor heat dissipation component. The water cooling pipeline 5 ( Figure 6 ) is to use flowing cold water to take away heat, which is distributed through pipelines, including flowing through the laser guide module 1, and the pipeline also includes flowing through the box body (upper box body 201 and lower box body 202). The water cooling pipeline 5 is a conventional setting method, and the arrangement of its pipelines is not described in detail. Considering that in the structure given in this embodiment, the electronic components in the upper cavity need to be more temperature controlled, the semiconductor heat dissipation assembly arranged in the upper cavity is taken as an example to further introduce the structure.

[0035] Mainly Figure 3 and Figure 4 Take the structure shown as an example. A cooling block 204 is attached to the partition 203, including contact with the polarization motor 207 to achieve heat conduction. A semiconductor cooling sheet 206 is provided on the top of the cooling block 204. The application of the semiconductor cooling sheet 206 belongs to the technology that should be known in the art. When a current passes through a loop composed of different conductors, the semiconductor cooling sheet 206 will absorb and release heat at the joints of different conductors in addition to generating irreversible Joule heat as the current direction changes. In simple terms, the energized semiconductor cooling sheet 206 has a cold surface on one side and a hot surface on the other side. The cold surface is attached to the cooling block 204, and the hot surface penetrates the upper box body 201 through the connector 205 for heat dissipation, which also includes connecting the connector 205 to the water cooling pipeline 5 to achieve heat dissipation. The water cooling pipeline 5 is provided with a bolt interface 209 on the box body, and the external circulating water pump can be connected through the bolt interface 209 to achieve cooling.

[0036] In the lower cavity, in addition to being reflected by the lens during the transmission process, some scattered light will be diffusely reflected in the internal space of the galvanometer. If it is splashed onto the electronic components in the upper cavity, it is easy to cause damage. Therefore, a partition 203 is added. The partition 203 isolates the upper and lower parts of the galvanometer to ensure the safety of the electronic components (controller, control circuit and electronic components) in the upper cavity. The air circulation is achieved by the 45-degree air circulation hole 210 of the partition 203. In addition to preventing laser sputtering, the direction of the exhaust hole can be controlled to make the cold air concentrate around the two lenses of the polarization module, thereby indirectly improving the cooling efficiency.

[0037] For the laser scanning device described in the utility model, considering the existence of hot air in the box body, the air is cooled and liquefied to cause the existence of water vapor, and then a drying box can be set in the box body to achieve dehumidification and drying by preventing the desiccant, and the built-in drying particles absorb moisture in the air to reduce the temperature, and prevent the temperature from dropping too fast to produce condensed water attached to the lens. The box body of the utility model also includes a fan, which can be set based on the side wall opening of the upper box body 201. The blades are located in the upper cavity to promote the air flow inside the galvanometer and accelerate the heat exchange rate. In addition, an air outlet grille can be appropriately opened on the upper box body 201 to cooperate with the heat dissipation of the fan.

[0038] Finally, it should be noted that the laser scanning device described in the present invention is not limited to the upper cavity for the semiconductor heat dissipation component. Other positions of the box body structure that are set to improve the heat dissipation effect are all within the scope of protection requested by the present invention.

Claims

1. A two-dimensional laser scanning device, characterized in that: The device comprises a laser guiding module (1), a polarization module (2) and a field lens module (3); the laser guiding module (1) is connected to a laser generator and is used to convert laser light into parallel light; the polarization module (2) comprises a reflective lens (211) and a polarization motor (207); the parallel light transmitted by the laser guiding module (1) is reflected to the field lens module (3) via the reflective lens (211); and the field lens module (3) realizes focusing of the laser beam after being reflected by the polarization module.

2. The two-dimensional laser scanning device according to claim 1, characterized in that: The device is provided with a cooling system, the cooling system comprising a water cooling pipeline (5) and a semiconductor heat dissipation component; The semiconductor heat dissipation component comprises a temperature control module and a cooling block (204), a semiconductor cooling sheet (206) being bonded to the cooling block (204), and the semiconductor cooling sheet (206) being connected to a water cooling pipeline (5) via a connector (205) to achieve heat dissipation.

3. The two-dimensional laser scanning device according to claim 1, characterized in that: The polarization module (2) and the field lens module (3) are integrated in a box body, the polarization module (2) is located in the box body, and the field lens module (3) is arranged through a field lens mounting plate (301) at the bottom of the box body, and comprises a field lens assembly (302).

4. The two-dimensional laser scanning device according to claim 3, characterized in that: The middle part of the box body is divided into an upper cavity and a lower cavity by a partition (203), the reflective lens (211) is located in the lower cavity, and the connector (205) in the upper cavity connected to the cooling block (204) penetrates the upper box body (201) to achieve heat dissipation; The upper cavity and the lower cavity are provided with an upper box body (201) and a lower box body (202) respectively.

5. The two-dimensional laser scanning device according to claim 4, characterized in that: The partition (203) is provided with an air circulation hole (210) inclined at 45 degrees.

6. The two-dimensional laser scanning device according to claim 1, characterized in that: The polarization module (2) of the device comprises polarization motors (207) arranged horizontally and vertically, and the output shaft of the polarization motor (207) is provided with a reflection lens (211), thereby forming a 2D galvanometer structure.

7. The two-dimensional laser scanning device according to claim 4, characterized in that: A drying box for absorbing moisture is arranged inside the upper box body (201), and a desiccant is placed inside the drying box.

8. The two-dimensional laser scanning device according to claim 4, characterized in that: The upper box body (201) is provided with a fan for promoting air flow.

9. The two-dimensional laser scanning device according to claim 1, characterized in that: The device comprises an air knife (4).

10. The two-dimensional laser scanning device according to claim 1, characterized in that: The laser guiding module (1) comprises a collimating beam expanding lens group, and the laser connection port adopts a QBH or QD laser connector.

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