Laser scanning plastic welding device using a fiber bundle

Abstract

The present application relates to a kind of laser scanning type plastic welding device using optical fiber bundle, comprising: scanner, by laser oscillator, light source and multiple rotating mirror are formed, for irradiating laser beam;Beam box is arranged below scanner, forms space so that laser beam is irradiated in space;First fixed plate, fixed to the bottom of beam box, laser beam is irradiated to first fixed plate;First optical fiber bundle, fixed to first fixed plate, by multiple first optical fiber, for the laser beam irradiated is branched into multiple first laser beam;Second fixed plate, fixed to the pair of bridge frame extended from beam box;Second optical fiber bundle, fixed to second fixed plate, by multiple second optical fiber, multiple second optical fiber is connected with each optical fiber in multiple first optical fiber, for the first laser beam irradiated is branched into multiple second laser beam;Beam guide fixture, including the pipeline being oppositely formed along the first welding frame border and being arranged with second optical fiber outlet end, for selectively pressing lid to bottom shell.

Description

TECHNICAL FIELD

[0001] The present invention relates to a plastic welding apparatus, and more particularly, to a laser scanning type plastic welding apparatus using an optical fiber bundle. Still more particularly, the present invention relates to a laser scanning type plastic welding apparatus for welding a temporary assembly of a three-dimensional shape by directly irradiating laser beams emitted from a laser beam scanner to first and second welding frames of the temporary assembly made of plastic using an optical fiber bundle. BACKGROUND

[0002] Generally, a method of joining two plastic members is to apply an adhesive to one of the upper or lower members to be joined, or to join them by ultrasonic welding, vibration welding, hot plate welding, etc.

[0003] However, these methods cause environmental pollution by using an adhesive, have poor appearance quality of the joint, have unstable joint strength, cause damage to the inside of the product when a mechanical external force is applied, and most importantly, cause a water tightness problem.

[0004] In order to solve these problems, a method of performing laser welding in a non-contact manner while conducting heat on a local area has been proposed.

[0005] This laser welding method is a method of joining a plastic cover having a property of being penetrated by a laser beam as an upper member to an opaque plastic bottom case as a lower member by pressing them together to form a temporary assembly in which a second welding frame on the edge of the bottom case and a first welding frame on the edge of the cover are stacked, and then welding the cover to the bottom case by irradiating a laser beam along the first and second welding frames from a light source provided on a robot. In other words, the laser beam, which has penetrated the first welding frame of the cover, is absorbed by the second welding frame of the opaque bottom case, causing the second welding frame to melt and thereby be welded to the first welding frame, thereby joining the cover and the bottom case.

[0006] However, since plastic welding of the temporary assembly must be performed by moving the robot provided with the light source, the production efficiency related to welding is not high because either the moving path of the robot must be precisely set or the robot must be moved for a long time during actual welding.

[0007] In addition, the robot itself is expensive and occupies a large space, resulting in a very high price of the plastic welding apparatus, and a lot of effort is required to precisely set the moving path of the robot, and a large installation space is also required. SUMMARY

[0008] The present application is proposed to solve the above problems of the prior art, and aims to provide a laser scanning type plastic welding device using an optical fiber bundle. The device can weld a temporarily assembled three-dimensional member made of plastic without using a robot, and can improve welding-related production efficiency by shortening the welding time.

[0009] To achieve the above object, the present application adopts the following technical solutions:

[0010] The present application is a laser scanning type plastic welding device using an optical fiber bundle, which is used to weld a first welding frame (R1) on a cover (P1) made of transparent plastic that can be penetrated by a laser beam to a second welding frame (R2) on a bottom shell (P2) having a three-dimensional shape made of non-transparent plastic using a laser beam, comprising:

[0011] A scanner (10) composed of a laser oscillator, a light source and a plurality of rotating mirrors for irradiating a laser beam (B);

[0012] A beam box (20) disposed below the scanner (10), which forms a space so that the laser beam (B) is irradiated in the space;

[0013] A first fixed plate (30) fixed at the bottom of the beam box (20), to which the laser beam (B) is irradiated;

[0014] A first optical fiber bundle (40) fixed to the first fixed plate (30), which is composed of a plurality of first optical fibers (41) for branching the irradiated laser beam (B) into a plurality of first laser beams (B1);

[0015] A second fixed plate (50) fixed to a pair of bridge frames (51) extending from the beam box (20);

[0016] A second optical fiber bundle (60) fixed to the second fixed plate (50), which is composed of a plurality of second optical fibers (61);

[0017] The plurality of second optical fibers (61) are connected to each of the plurality of first optical fibers (41) for branching the irradiated first laser beams (B1) into a plurality of second laser beams (B2);

[0018] A beam guide clamp (80) including a pipe (81) arranged with the outlet end of the second optical fiber (61) and opposite along the frame of the first welding frame (R1), which is used to selectively press the cover (P1) towards the bottom shell (P2).

[0019] Further, a monitoring section (70) is provided for monitoring the working condition by using a probe optical fiber (62) branched from the second optical fiber bundle (60).

[0020] Further, the monitoring section (70) comprises:

[0021] a power detector (71) for sensing the output power of the second laser beam (B2) irradiated in a first probe optical fiber (62a) among the probe optical fibers (62) for real-time confirming whether the second laser beam (B2) is currently being irradiated;

[0022] a thermal detector (72) for sensing the second laser beam (B2) irradiated in a second probe optical fiber (62b) among the probe optical fibers (62) for generating a signal for detecting the temperature of the welding site of the product corresponding to the current output power of the second laser beam (B2) being irradiated;

[0023] a beam analyzer (73) for sensing the second laser beam (B2) irradiated in a third probe optical fiber (62c) among the probe optical fibers (62) for confirming the characteristics of the second laser beam (B2) being irradiated.

[0024]

[0025] Further, a contamination prevention section (90) is provided for preventing external contamination sources from entering into the beam box (20).

[0026] The contamination prevention section (90) comprises an air inlet (91) and a plurality of air outlet holes (92),

[0027] The air inlet (91) is formed on the upper side of the beam box (20) for supplying air filtered and cleaned of foreign substances;

[0028] The plurality of air outlet holes (92) are formed on the lower side of the beam box (20) for discharging the air flowing in from the air inlet (91).

[0029] Further, a first cooling section (100) is provided for cooling the first fixed plate (30) during the operation of the scanner (10).

[0030] Further, an optical fiber temperature sensing section (110) is provided, which is composed of a plurality of temperature sensors (111) arranged on the first fixed plate (30).

[0031] ​The plurality of temperature sensors (111) are respectively connected independently with each of the plurality of first optical fibers (41) constituting the first optical fiber bundle (40) for measuring the temperature of each first optical fiber (41) and generating a corresponding signal.

[0032] Further, a second cooling unit (120) is further included for cooling the second fixed plate (50) during the operation of the scanner (10).

[0033] In summary, the laser scanning type plastic welding device using an optical fiber bundle comprises:

[0034] A first optical fiber bundle (40) fixed to the first fixed plate (30), the first optical fiber bundle (40) is composed of a plurality of first optical fibers (41) for branching the irradiated laser beam (B) into a plurality of first laser beams (B1);

[0035] A second optical fiber bundle (60) fixed to the second fixed plate (50), the second optical fiber bundle (60) is composed of a plurality of second optical fibers (61);

[0036] The plurality of second optical fibers (61) are connected with each of the plurality of first optical fibers (41) for branching the irradiated first laser beam (B1) into a plurality of second laser beams (B2);

[0037] A beam guide clamp (80) comprising a pipeline (81) arranged with the outlet end of the second optical fiber (61) and oppositely formed along the frame of the first welding frame (R1) for selectively pressing the cover (P1) to the bottom shell (P2).

[0038] This makes it possible to irradiate the second laser beam (B2) through all the pipelines (81) at the same time, achieving the welding of the first and second welding frames (R1) (R2) at one time, thereby reducing the time required for welding and improving efficiency.

[0039] In addition, during the welding of the temporary assembly (P), the temperature (output power) of the second laser beam (B2) irradiated by the pipeline (81) is monitored in real time by the monitoring unit (70), which makes it possible to confirm whether the welding is defective in real time, thereby achieving high-quality welding and convenient maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the patent, the related drawings will be briefly introduced as follows. It can be understood that the drawings described below are only used to illustrate some embodiments of the patent, and those skilled in the art can also obtain many other technical features and connection relationships not mentioned in this paper from these drawings.

[0041] Figure 1This is a schematic diagram of a laser scanning plastic welding device utilizing an optical fiber bundle according to the present invention.

[0042] Figure 2 for Figure 1 A schematic diagram of a plastic base and cover being welded by a welding device;

[0043] Figure 3 for Figure 1 A schematic diagram of the main structure of a laser scanning plastic welding device;

[0044] Figure 4 for Figure 3 A schematic diagram of a conduit with a second fiber bundle arranged in rows along the bottom edge of the mid-beam guide clamp;

[0045] Figure 5 for Figure 3 A schematic diagram of the first cooling section disposed on the first fixed plate;

[0046] Figure 6 for Figure 3 A schematic diagram of the second cooling section disposed on the second fixed plate;

[0047] Figure 7 for Figure 3 A schematic diagram of an optical fiber temperature sensor that independently senses the temperature of each optical fiber in the first optical fiber bundle.

[0048] Figure 8 for Figure 2 A schematic diagram showing that the bottom shell and the cover have been welded together by a laser beam.

[0049] Explanation of reference numerals in the attached figures:

[0050] P... Temporary assembly

[0051] P1 ... lid

[0052] R1 ... First welding frame

[0053] P2 ... Bottom shell

[0054] R2 ... Second welding frame

[0055] 10 ... Scanner

[0056] 20 ...beam box

[0057] 21 ... Laser safety window

[0058] 30 ... First fixing plate

[0059] 40 ... First fiber bundle

[0060] 41 ... First optical fiber

[0061] 50 ... Second fixing plate

[0062] 51... Cable tray

[0063] 60 ... Second fiber bundle

[0064] 61 ... Second optical fiber

[0065] 62... Detection fiber

[0066] 62a, 62b, 62c ... First, second, and third detection optical fibers

[0067] 70 ... Monitor

[0068] 71 ... Power Detector

[0069] 72 ... Thermal detector

[0070] 73 ... Beam Analyzer

[0071] 80 ... Beam guide clamp

[0072] 81 ... Pipeline

[0073] 90 ... Pollution Prevention Department

[0074] 91 ... Air intake

[0075] 92 ... Exhaust port

[0076] 100 ... First Cooling Section

[0077] 101 ... First refrigerant flow path

[0078] 102 ... First-class entrance

[0079] 103 ... First-class exit

[0080] 110 ... Temperature Sensing Unit

[0081] 111 ... Temperature sensor

[0082] 120 ... Second Cooling Section

[0083] 121 ... Second inner refrigerant flow path

[0084] 122 ... Second side inlet

[0085] 123 ... Second side outlet

[0086] 124... second outer refrigerant flow path

[0087] 125... second outer flow inlet

[0088] 126... second outer flow outlet DETAILED DESCRIPTION

[0089] A laser scanning type plastic welding device using an optical fiber bundle according to the present application will be described in detail below with reference to the accompanying drawings.

[0090] The above-mentioned "over" or "above" includes not only direct contact but also indirect contact. The terms of first, second, etc. can be used to describe various components, but the components should not be limited by these terms. The terms are used only to distinguish one component from another component. Unless the context clearly indicates otherwise, the singular expression includes the plural expression. In addition, whenever it is said that any part "includes" any component, it does not mean that any other component is excluded, but it means that additional components can be included unless there is a specific contrary indication. In addition, the terms "unit", "module", etc. in the specification mean a unit that performs at least one function or operation.

[0091] Figure 1 A schematic diagram of a laser scanning type plastic welding device using an optical fiber bundle according to the present application;

[0092] Figure 2 A schematic diagram of a laser scanning type plastic welding device using an optical fiber bundle according to the present application; Figure 1 A schematic diagram of a bottom case and a cover made of plastic that are welded by the welding device according to the present application;

[0093] Figure 3 A schematic diagram of a laser scanning type plastic welding device using an optical fiber bundle according to the present application; Figure 1

[0094] A schematic diagram of a laser scanning type plastic welding device using an optical fiber bundle according to the present application; Figure 4 Figure 3 A schematic diagram of a laser scanning type plastic welding device using an optical fiber bundle according to the present application;

[0095] Figure 5 Figure 3 A schematic diagram of a laser scanning type plastic welding device using an optical fiber bundle according to the present application;

[0096] Figure 6 A schematic diagram of a laser scanning type plastic welding device using an optical fiber bundle according to the present application; Figure 3

[0097] A schematic diagram of a laser scanning type plastic welding device using an optical fiber bundle according to the present application; Figure 7 Figure 3 A schematic diagram of a laser scanning type plastic welding device using an optical fiber bundle according to the present application;​​​

[0098] Figure 8 For Figure 2 Schematic diagram of the middle bottom shell and the cover welded by the laser beam.

[0099] As shown in the figure, the laser scanning type plastic welding device using optical fiber bundle of the present application is used to weld the first welding frame (R1) on the cover (P1) made of transparent plastic which can be penetrated by the laser beam to the second welding frame (R2) on the bottom shell (P2) made of opaque plastic with a three-dimensional shape by using the laser beam.

[0100] The laser scanning type plastic welding device comprises:

[0101] A scanner (10) composed of a laser oscillator, a light source and a plurality of rotating mirrors for irradiating a laser beam (B);

[0102] A beam box (20) disposed below the scanner (10) to form a space so that the laser beam (B) is irradiated in the space;

[0103] A first fixed plate (30) fixed at the bottom of the beam box (20) to which the laser beam (B) is irradiated;

[0104] A first optical fiber bundle (40) fixed to the first fixed plate (30) composed of a plurality of first optical fibers (41) for branching the irradiated laser beam (B) into a plurality of first laser beams (B1);

[0105] A second fixed plate (50) fixed to a pair of bridges (51) extended from the beam box (20);

[0106] A second optical fiber bundle (60) fixed to the second fixed plate (50) composed of a plurality of second optical fibers (61);

[0107] The plurality of second optical fibers (61) are connected to each of the plurality of first optical fibers (41) for branching the irradiated first laser beams (B1) into a plurality of second laser beams (B2);

[0108] A monitoring part (70) for monitoring the working condition by using a detection optical fiber (62) branched from the second optical fiber bundle (60);

[0109] A bundle guide clamp (80) comprising a pipe (81) formed by arranging the second fiber (61) outlet end and the opposite edges of the first welding frame (R1) for selectively pressing the cover (P1) to the bottom shell (P2);

[0110] A pollution prevention part (90) for preventing external pollution sources from entering the inside of the beam box (20);

[0111] A first cooling part (100) for cooling the first fixed plate (30) during the operation of the scanner (10);

[0112] A fiber temperature sensing part (110) composed of a plurality of temperature sensors (111) arranged on the first fixed plate (30);

[0113] The plurality of temperature sensors (111) are respectively connected to each of the plurality of first fibers (41) constituting the first fiber bundle (40) for measuring the temperature of each first fiber (41) and generating a corresponding signal.

[0114] A second cooling part (120) for cooling the second fixed plate (50) during the operation of the scanner (10);

[0115] As shown in Figure 2 The temporary assembly (P) composed of the cover (P1) and the bottom shell (P2) is completely combined by welding the first and second welding frames (R1) (R2) using a laser beam. After welding, it can be used for various purposes, such as a lamp body for a car headlight or a rear light.

[0116] The scanner (10) includes a laser oscillator, a light source, and a plurality of rotating mirrors, which is a common configuration in the industry and will not be described in detail.

[0117] As shown in Figure 1 The beam box (20) is arranged below the scanner (10), has a three-dimensional shape and forms a space in which the laser beam (B) can be irradiated, the inlet end faces the scanner (10), and the outlet end faces the first fixed plate (30).

[0118] The front side of the beam box (20) is provided with a laser safety window (21) for observing the internal situation. The operator can view the inside of the beam box (20) through the laser safety window (21) to confirm whether the welding device is operating normally, and protect the operator from being injured by the laser beam during the confirmation process.

[0119] As shown in Figure 3As shown, the first fixing plate (30) is rectangular in shape and is fixed to the bottom of the exit end of the beam box (20).

[0120] Two elongated holes (31) and (32) are formed on the upper part of the first fixing plate (30) for fixing the entrance ends of a plurality of first optical fibers (41). Preferably, beam guides (not shown) are provided in the two elongated holes (31) and (32) for focusing the laser beam (B) emitted from the scanner (10) onto the first optical fiber (41).

[0121] In order to make the incoming laser beam (B) branch into multiple first laser beams (B1), the first fiber bundle (40) is composed of multiple first optical fibers (41), and the entrance end of the first optical fiber (41) is located inside the elongated hole.

[0122] like Figure 3 As shown, the second fixing plate (50) is a square plate and is fixed to a pair of bridges (51) extending from the beam box (20).

[0123] To branch the incoming first laser beam (B1) into multiple second laser beams (B2), the second fiber bundle (60) includes multiple second fibers (61). For this purpose, as... Figure 4 As shown, multiple second optical fibers (61) are connected to each first optical fiber (41) by branching into multiple units.

[0124] The monitoring unit (70) uses a probe fiber (62) branching from the second fiber bundle (60) to monitor the operation. For example... Figure 1 As shown, it includes:

[0125] The power detector (71) senses the output power of the second laser beam (B2) irradiated in the first detection fiber (62a) in the detection fiber (62) to confirm in real time whether the second laser beam (B2) is currently irradiating.

[0126] The thermal detector (72) generates a signal to detect the temperature of the welded part of the product at the current output power of the second laser beam (B2) irradiated in the second detection fiber (62b) of the detection fiber (62).

[0127] The beam analyzer (73) senses the second laser beam (B2) irradiated in the second probe fiber (62c) of the probe fiber (62) to confirm the characteristics of the irradiated second laser beam (B2). That is, the power detector (71) can confirm in real time whether the second laser beam (B2) is irradiating normally;

[0128] The temperature of the welding portion of the product corresponding to the current output power of the irradiated second laser beam (B2) is detected by the heat detector (72);

[0129] The wavelength and other characteristics of the irradiated second laser beam (B2) are confirmed by the beam analyzer (73).

[0130] Furthermore, the signals generated by the power detector (71), the heat detector (72), and the beam analyzer (73) are used as signals for confirming whether the lid (P1) is normally welded to the case P2 in real time, and conversely, as signals for triggering an alarm when an abnormal situation occurs.

[0131] As shown in Figure 4 In order to be able to pressurize the lid (P1), the beam guide jig (80) has a concave-convex surface shape corresponding to the lid (P1).

[0132] On the bottom edge of the beam guide jig (80), a plurality of pipes (81) in which the outlet ends of the second optical fiber bundle (60) are arranged are formed along the edge of the first welding frame (R1). When the beam guide jig (80) pressurizes the lid (P1) temporarily assembled to the case (P2), the pipes (81) will be directed to the first and second welding frames (R1) (R2). At this time, the second laser beam (B2) is irradiated from the second optical fiber (61) constituting the second optical fiber bundle (60) all at once, thereby welding the entire first and second welding frames (R1) (R2) corresponding to the pipes (81) at once.

[0133] By the beam guide jig (80), the second welding frame (R2) on the case (P2) and the first welding frame (R1) on the lid (P1) are welded to each other, as shown in Figure 8 As a result, the case (P2) and the lid (P1) have become one.

[0134] The anti-pollution portion (90) includes an air inlet (91) formed on the upper side of the beam box (20) for supplying air filtered and cleared of foreign matter, and a plurality of air outlet holes (92) formed on the lower side of the beam box (20) for discharging the air flowing in from the air inlet (91).

[0135] An appropriate space is required between the scanner (10) and the first optical fiber bundle (40) in order to diffuse the laser beam, and such a space is formed inside the beam box (20).

[0136] On the other hand, if a foreign matter such as dust or smoke generated when temporarily assembling a welding jig enters the inside of the light bundle case (20), it can adhere to the entrance end face of the first optical fiber (41) (41') that constitutes the first optical fiber bundle (40). In this case, if the entrance end face is irradiated with a laser beam, the foreign matter adhering to the entrance end face can be burned and the entrance end face can become opaque.

[0137] In this case, the opaque entrance end face can absorb the energy of the laser beam and cause the temperature thereof to rise to several hundred degrees or more, which can cause the first optical fiber bundle (40) itself to be damaged or can cause the sheath wire that wraps the first optical fiber bundle (40) to be damaged.

[0138] To prevent this, the contamination prevention section (90) maintains the inside of the light bundle case (20) at a positive pressure at all times by allowing only air filtered and cleaned of foreign matter by the air inlet (91) to flow in, thereby preventing external foreign matter from entering the inside of the light bundle case (20). Thus, the various optical systems and the first optical fiber bundle (40) can be protected from external contamination.

[0139] The optical fiber temperature sensing section (110) senses whether a particular first optical fiber has a temperature abnormality by individually measuring the temperature of each of the first optical fibers (41) that constitute the first optical fiber bundle (40) and generates a signal so that appropriate measures can be taken. The optical fiber temperature sensing section (110) includes a plurality of temperature sensors (111), in this embodiment, 20 temperature sensors (111).

[0140] When the laser beam (B) generated by the scanner (10) is irradiated onto the plurality of first optical fibers (41) provided to the first fixed plate, the portion of the laser beam (B) that does not enter the entrance end of the first optical fiber (41) can be absorbed around the first optical fiber (41) and heat the first optical fiber by thermal conduction, which can eventually cause the first optical fiber to be damaged. The present application senses abnormal heating of a particular first optical fiber (41) by the laser beam that does not completely enter the first optical fiber (41) by using the optical fiber temperature sensing section (110) that includes a plurality of temperature sensors (111) that individually measure the temperature of each of the plurality of first optical fibers (41), so that appropriate measures can be taken to prevent the first optical fiber (41) from being damaged.

[0141] Figure 5 A first cooling section provided to a first fixed plate in a laser beam machining device is shown. Figure 3 The first cooling section (100) includes:

[0142] a first refrigerant flow path (101) formed in a zigzag shape in the inside of the first fixed plate (30);

[0143] A first flow inlet (102) provided on one side of the first fixed plate (30) and supplying refrigerant to the first refrigerant flow path (101);

[0144] A first flow outlet (103) provided on the other side of the first fixed plate (30) and discharging refrigerant that has passed through the first refrigerant flow path (101).

[0145] Thus, heat that can be generated in the first fixed plate (30) during branching of the laser beam (B) emitted from the scanner (10) into a plurality of first laser beams (B1) is cooled by the first cooling portion (100), thereby preventing damage to the first fiber bundle (40) fixed to the first fixed plate (30) due to high temperature.

[0146] Figure 6 A second cooling portion provided on a second fixed plate in a scanner is shown. Figure 3 The second cooling portion (120) includes:

[0147] A second inner side refrigerant flow path (121) formed inside an inner side of the second fixed plate (50);

[0148] A second inner side flow inlet (122) provided on one side of the second fixed plate (50) and supplying refrigerant to the second inner side refrigerant flow path (121);

[0149] A second inner side flow outlet (123) provided on the other side of the second fixed plate (50) and discharging refrigerant that has passed through the second inner side refrigerant flow path (121);

[0150] A second outer side refrigerant flow path (124) formed inside an outer side of the second fixed plate (50);

[0151] A second outer side flow inlet (125) provided on one side of the second fixed plate (50) and supplying refrigerant to the second outer side refrigerant flow path (124);

[0152] A second outer side flow outlet (126) provided on the other side of the second fixed plate (50) and discharging refrigerant that has passed through the second outer side refrigerant flow path (124);

[0153] Thus, heat that can be generated in the second fixed plate (50) during branching of the first laser beam (B1) emitted from the first fiber bundle (40) into a plurality of second laser beams (B2) is cooled by the second cooling portion (120), thereby preventing damage to the second fiber bundle (60) fixed to the second fixed plate (50) due to high temperature.

[0154] In summary, the present application includes:

[0155] a first optical fiber bundle (40) fixed to the first fixing plate (30), the first optical fiber bundle (40) being composed of a plurality of first optical fibers (41) for branching the irradiated laser beam (B) into a plurality of first laser beams (B1);

[0156] a second optical fiber bundle (60) fixed to the second fixing plate (50), the second optical fiber bundle (60) being composed of a plurality of second optical fibers (61) connected to each of the plurality of first optical fibers (41), the plurality of second optical fibers (61) for branching the irradiated first laser beams (B1) into a plurality of second laser beams (B2);

[0157] a beam guide clamp (80) for selectively pressing the cover (P1) to the bottom case (P2), the beam guide clamp (80) having a pipe (81) in which the outlet end of the second optical fiber (61) is arranged, formed opposite along the frame of the first welding frame (R1).

[0158] Thus, the second laser beams (B2) can be irradiated through all the pipes (81) at the same time, thereby achieving welding of the first and second welding frames (R1) (R2) at one time, so as to reduce the time required for welding and improve the efficiency.

[0159] In addition, during the welding of the temporarily assembled part (P), the temperature (output power) of the second laser beams (B2) irradiated by the pipes (81) is monitored in real time by the monitoring part (70), so that it can be confirmed in real time whether the welding is defective, thereby achieving high-quality welding and convenient maintenance.

[0160] The technical solutions in the embodiments of the present application are described above by combining with the drawings in the embodiments of the present application. Obviously, the described embodiments are only one of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

Claims

1. A laser scanning type plastic welding apparatus using an optical fiber bundle for welding a first welding frame (Rl) on a cover (Pl) made of a transparent plastic that can be penetrated by a laser beam to a second welding frame (R2) on a bottom case (P2) having a three-dimensional shape made of an opaque plastic using a laser beam, characterized in that, The application relates to a laser beam scanning device, comprising: a scanner (10) composed of a laser oscillator, a light source and a plurality of rotating mirrors, for irradiating a laser beam (B); a beam box (20) arranged below the scanner (10), for forming a space so that the laser beam (B) irradiates in the space; a first fixed plate (30) fixed to the bottom of the beam box (20), where the laser beam (B) irradiates; a first optical fiber bundle (40) fixed to the first fixed plate (30) and composed of a plurality of first optical fibers (41), for branching the irradiated laser beam (B) into a plurality of first laser beams (B1); a second fixed plate (50) fixed to a pair of bridges (51) extending from the beam box (20); a second optical fiber bundle (60) fixed to the second fixed plate (50) and composed of a plurality of second optical fibers (61); the plurality of second optical fibers (61) are connected with each of the plurality of first optical fibers (41), for branching the irradiated first laser beams (B1) into a plurality of second laser beams (B2); a beam guide clamp (80) comprising a pipe (81) arranged with the outlet end of the second optical fiber (61) and oppositely formed along the frame of a first welding frame (R1), for selectively pressing the cover (P1) to the bottom shell (P2).

2. A laser scanning plastic welding apparatus using an optical fiber bundle according to claim 1, wherein The application further comprises a monitoring part (70) for monitoring the working condition by using a detection optical fiber (62) branched from the second optical fiber bundle (60).

3. A laser scanning plastic welding apparatus using an optical fiber bundle according to claim 2, wherein The monitoring part (70) comprises: a power detector (71) for sensing the output power of the second laser beam (B2) in a first detection optical fiber (62a) of the detection optical fiber (62), for confirming whether the second laser beam (B2) is currently irradiating in real time; a heat detector (72) for sensing the second laser beam (B2) in a second detection optical fiber (62b) of the detection optical fiber (62), for generating a signal for detecting the temperature of the welding position of a product corresponding to the current output power of the irradiated second laser beam (B2); a beam analyzer (73) for sensing the second laser beam (B2) in a third detection optical fiber (62c) of the detection optical fiber (62), for confirming the characteristics of the irradiated second laser beam (B2).

4. The laser scanning plastic welding apparatus using an optical fiber bundle according to claim 1, wherein The application further comprises: an anti-pollution part (90) for preventing external pollution sources from entering the inside of the beam box (20). The anti-pollution part (90) comprises an air inlet (91) and a plurality of air outlets (92), the air inlet (91) is formed on the upper side of the light beam box (20) for supplying air filtered and cleaned of foreign substances; The plurality of air outlets (92) are formed on the lower side of the light beam box (20) for discharging the air flowing in from the air inlet (91).

5. The laser scanning plastic welding apparatus using an optical fiber bundle according to claim 1, wherein It comprises a first cooling part (100) for cooling the first fixed plate (30) during the operation of the scanner (10).

6. A laser scanning plastic welding apparatus using an optical fiber bundle according to claim 1, wherein It also comprises an optical fiber temperature sensing part (110) composed of a plurality of temperature sensors (111) arranged on the first fixed plate (30); The plurality of temperature sensors (111) are respectively and independently connected with each of the plurality of first optical fibers (41) constituting the first optical fiber bundle (40) for measuring the temperature of each first optical fiber (41) and generating a corresponding signal.

7. The laser scanning plastic welding apparatus using an optical fiber bundle according to claim 1, wherein It also comprises a second cooling part (120) for cooling the second fixed plate (50) during the operation of the scanner (10).

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