CN212603478U - Laser butt welding device for transparent plastic - Google Patents
Laser butt welding device for transparent plastic Download PDFInfo
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- CN212603478U CN212603478U CN202021316591.0U CN202021316591U CN212603478U CN 212603478 U CN212603478 U CN 212603478U CN 202021316591 U CN202021316591 U CN 202021316591U CN 212603478 U CN212603478 U CN 212603478U
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Abstract
The utility model provides a transparent plastic's laser butt welding device, butt welding device includes laser instrument and workstation, is equipped with motion platform and frock clamp subassembly on the workstation, is equipped with two butt welding transparent plastic boards on the frock clamp subassembly, and plastic board butt joint position top is equipped with the fin, and motion platform is equipped with the soldered connection subassembly, and two soldered connections on the soldered connection subassembly become certain angle installation, and the soldered connection passes through optic fibre and is connected with the laser instrument. The laser emits two laser beams, the focuses of the two laser beams are focused on the butt joint position of the two butt-welded transparent plastic plates, the plastic absorbs the laser energy and converts the laser energy into heat energy, so that the plastic at the butt joint position is slightly melted, and a butt joint welding line is formed after cooling. The utility model discloses under the condition of absorbent of not coating, realize two blocks of transparent plastic's laser butt welding, have welding efficiency height, welding strength height, the welding seam is pleasing to the eye, the characteristics of clean environmental protection, be applicable to the transparent plastic's of high requirement field laser butt welding such as food, medical treatment.
Description
Technical Field
The utility model relates to a plastic laser welding field, concretely relates to transparent plastic's laser butt welding field.
Background
The plastic is a high molecular compound polymerized by addition polymerization or polycondensation reaction by using monomers as raw materials, and is an engineering material with wide application because of the excellent characteristics of light weight, good chemical stability, corrosion resistance, impact resistance, good insulating property and the like.
Most of plastic products in the market are formed by injection molding, and due to the diversity development of the plastic products, the individualized requirements are difficult to meet only by means of injection molding, so that secondary molding of injection molding plastics is imperative. At present, the traditional plastic secondary forming method mainly comprises cementing, hot-melt welding, hot-air welding, ultrasonic welding, friction welding and the like. In the actual production process, the traditional plastic secondary forming method has respective defects which are difficult to overcome, such as low connection strength, toxic gas, noise, welding stress and the like. In recent years, the laser welding method has become a very potential plastic welding method due to the advantages of high welding strength, high welding efficiency, capability of realizing precise fine welding, no stress, cleanness, environmental protection and the like.
In common plastic laser welding (wavelength of 800-. However, a large proportion of the plastic products on the market are double-layer transparent, and the common plastic laser welding is difficult to directly weld.
Engineers have conducted a lot of research on welding of double-layer transparent plastics, and patents CN 101868495B and CN105440639B disclose a method of adding near-infrared laser absorber or carbon black into transparent plastic injection molding raw material powder, wherein plastic powder and light-absorbing powder are uniformly mixed by a mixer, and then injection-molded into a plastic product, and the light-absorbing powder absorbs laser energy to achieve the welding effect. Patent CN107379560B discloses a method for coating clearwell absorbent or black paint on the surface of the lower light-transmitting layer, and the welding effect is achieved by absorbing laser energy with auxiliary light absorbent. Patent CN105968566B discloses a method for welding by using a plastic dissolving agent to dissolve black light-absorbing plastic particles, mixing the two, stirring to form a viscous plastic solution, coating the viscous plastic solution on the surface of a lower transparent layer, and passing through the light-absorbing agent to achieve the welding effect. The method disclosed by the four patents can realize the welding of the double-layer transparent plastic, but can increase the raw material cost of the plastic product to a certain extent and influence the appearance of the transparent plastic product; furthermore, the quality of the weld seam may also be uneven due to the uneven distribution of the light-absorbing powder. Patent CN108515703A discloses that transparent plastics have low light transmittance to laser with wavelength of 1700 nm-2000 nm, so that when welding transparent plastics, no absorbent needs to be added. However, the method disclosed in the patent can only realize laser lap welding of transparent plastics, and cannot realize laser butt welding of transparent plastics, and the welding speed in the method disclosed in the patent is low, and is only 2 mm/s-4 mm/s, so that the low welding speed is difficult to meet the market demand of high-speed development.
As described above, the prior art methods and patents have not been investigated to find a method and an apparatus for laser butt welding that can satisfy the requirements of transparent plastics, and it is necessary to develop a new method and a new apparatus.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a do not coat absorbent, welding efficiency is high, welding strength is high, the welding seam is pleasing to the eye, clean environmental protection, satisfies the transparent plastic's of high requirement field transparent plastic butt welding demand laser butt welding device such as food, medical treatment to overcome the weak point among the prior art.
According to a laser butt welding device of transparent plastic of this purpose design, including laser instrument and workstation, be equipped with motion platform on the workstation, and be used for the frock clamp subassembly of two butt welding transparent plastic boards of clamping, two butt welding transparent plastic board tops are equipped with the fin, the fin covers the butt joint position of two butt welding transparent plastic boards at least, motion platform is equipped with the soldered connection subassembly, the soldered connection subassembly includes two soldered connections, two soldered connections are connected through optic fibre and laser instrument, the laser beam of laser instrument transmission passes through optical fiber transmission and passes through two soldered connections respectively, and have contained angle A between two soldered connections, so that the relative angle of two bundles of laser beams through two soldered connections is 60 ~ 90, the focus of two bundles of laser beams all focuses on two butt welding transparent plastic board butt joint positions.
The two welding heads are respectively provided with a focusing lens assembly and a collimating lens assembly so as to realize focusing and collimation of the laser beam output by the optical fiber; the welding head realizes uniform laser beam spots by adjusting the mounting position of the focusing lens assembly, and the diameter of each spot is 0.4-2.0 mm; the welding head assembly further comprises a welding head fixing block, and the two welding heads are obliquely fixed on the welding head fixing block respectively.
The laser is at least a semiconductor laser, the laser emits laser beams with the wavelength of 1700 nm-2000 nm, the output power of the laser is 30-100W, the stable fluctuation value of the output power is less than 3%, and the beam quality M2The factor is less than 1.5.
The motion platform is at least a three-axis linear motion platform or a multi-joint manipulator motion platform, and the two welding heads respectively realize an executing mechanism of a two-dimensional plane or three-dimensional space curve welding track through the motion platform.
The tool clamp assembly comprises a tool bottom plate, an electrically driven or pneumatic upper and lower pressing component and a horizontal pressing component, wherein more than two sliding guide columns, two pressing cylinders and a plastic plate supporting matching piece are arranged on the tool bottom plate; the pressing cylinder is provided with a pressing plate, the pressing plate is provided with an opening part, the opening part is provided with a transparent radiating fin, more than two sliding guide pillars respectively penetrate through the pressing plate, the pressing plate is positioned above the supporting and matching piece of the plastic plate, the pressing plate is connected with the pressing cylinder in a matched mode, so that the pressing plate moves up and down along the sliding guide pillars, the pressing cylinder, the pressing plate and the radiating fin are pressed up and down on two butt welding transparent plastic plates together, and the pressing cylinder and the pressing plate are combined into a pneumatic up-down.
The plastic plate supporting matching piece comprises a supporting side plate, a supporting flat plate and an elastic piece, wherein the elastic piece is arranged on the supporting flat plate, the supporting flat plate is positioned at the top of the supporting side plate, one end of the elastic piece abuts against the inner side of the supporting flat plate, the other end of the elastic piece abuts against the outer side of the transparent plastic plate, the elastic piece realizes the butt joint horizontal compression of the transparent plastic plates so as to enable the two butt-welded transparent plastic plates to keep horizontal compression force in the welding process, and the butt joint horizontal compression force of the transparent plastic plates is adjusted by changing the pre-compression force of the elastic piece so as to enable the elastic.
The material of the radiating fin is at least quartz glass or sapphire glass, in order to ensure sufficient radiating efficiency and not obviously consume laser energy, the heat conductivity coefficient of the radiating fin at the temperature of 150-300 ℃ is more than 1.0W/m.K, and the absorptivity of the radiating fin to laser beams with the wavelength of 1700-2000 nm is less than 5%.
The two butt welding transparent plastic plates are made of the same plastic or different melting plastics.
The utility model provides a method of transparent plastic's laser butt welding, including above-mentioned transparent plastic's laser butt welding device, transparent plastic's laser butt welding device includes the laser instrument, and motion platform and frock clamp subassembly of setting on the workstation, frock clamp subassembly clamping two butt welding transparent plastic boards, be equipped with the fin on two butt welding transparent plastic boards, motion platform is triaxial linear motion platform or articulated manipulator motion platform at least, and be equipped with the soldered connection subassembly on the motion platform, the soldered connection subassembly includes two soldered connections, two soldered connections are connected through optic fibre and laser instrument, and two soldered connections tilting settings, contained angle A has between two soldered connections, focus lens subassembly and collimation lens subassembly are installed respectively to two soldered connections.
The welding method comprises
a. Clamping two butt-welded transparent plastic plates on a tool clamp assembly, and adjusting pressing force;
b. and adjusting an included angle between the two welding heads on the moving platform, and respectively adjusting the mounting positions of the focusing lens assemblies on the two welding heads.
c. The laser is started, two bundles of laser beams are emitted by the laser, the laser beams pass through two welding heads respectively through optical fiber transmission and then penetrate through the radiating fins to reach the butt joint parts of the two transparent plastic plates, the focuses of the two bundles of laser beams are all focused on the butt joint parts of the transparent plastic plates, high-speed movement of polymers inside the plastic is performed under the action of laser energy, the laser energy is converted into heat energy, a small amount of plastic at the butt joint parts is melted, meanwhile, the plastic is fused mutually under the action of a clamp, and butt joint welding seams are formed after cooling.
In addition, the butt joint part of the two transparent plastic plates is ensured to be accurately controlled between the glass transition temperature and the thermal decomposition temperature in the welding process through the selection of welding process parameters, so that a high-strength welding seam is formed, wherein the welding process parameters comprise laser power, welding speed and spot diameter.
The utility model has the advantages as follows:
a. two welding heads forming a certain angle are arranged on the moving platform, and the focuses of the two beams of laser are focused on the butt joint part of the plastic plate, so that the energy of the laser absorbed by the plastic at the butt joint part is maximum;
b. by optimizing and selecting welding process parameters, the plastic temperature range of the butt joint part is controlled between the glass transition temperature and the thermal decomposition temperature in the welding process, and a high-strength welding seam is formed under the action of a tool clamp;
c. due to reasonable space distribution of laser energy and the action of the radiating fins, the plastic on the upper surface of the plastic is guaranteed not to be melted.
The utility model discloses under the condition of absorbent of not coating, realize two blocks of transparent plastic's laser butt welding, have welding efficiency height, welding strength height, the welding seam is pleasing to the eye, the characteristics of clean environmental protection, be applicable to the transparent plastic's of high requirement field laser butt welding such as food, medical treatment.
Drawings
Fig. 1 is a schematic view of a three-dimensional structure of a laser butt welding device for transparent plastics according to a first embodiment of the present invention.
Fig. 2 is a schematic view of a three-dimensional structure of a fixture assembly according to a first embodiment of the present invention.
Fig. 3 is a schematic view of a planar structure of a fixture assembly according to a first embodiment of the present invention.
Fig. 4 is a schematic view of a plane structure of a welding head assembly according to a first embodiment of the present invention.
Fig. 5 is a schematic structural view of the butt welding of two butt welded transparent plastic plates according to the first embodiment of the present invention.
In the figure, 1 is a laser, 2 is an optical fiber, 3 is a welding head, 4 is a laser beam, 5 is a radiating fin, 6 is a transparent plastic plate, 7 is a workbench, 8 is a moving platform, 8.1 is a first sliding table, 8.2 is a second sliding table, 8.3 is a third sliding table, 9 is a welding head component, 10 is a tooling fixture component, 11 is a quasi-straight lens component, 12 is a focusing lens component, 13 is a welding head fixing block, 14 is a tooling bottom plate, 15 is an upper and lower pressing component, 16 is a horizontal pressing component, 17 is a supporting side plate, 18 is a pressing plate, 19 is a sliding guide pillar, 20 is an elastic component, 21 is a supporting flat plate, 22 is a pressing cylinder, 23 is a plastic plate supporting matching piece, and 24 is a supporting rack.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples.
First embodiment
Referring to fig. 1, a laser butt welding device for transparent plastics comprises a laser 1 and a workbench 7, wherein the workbench 7 is provided with a moving platform 8, and a tool clamp assembly 10 for clamping two butt-welded transparent plastic plates 6, wherein a radiating fin 5 is arranged above the two butt-welded transparent plastic plates 6, the radiating fin 5 at least covers the butt joint part of the two butt-welded transparent plastic plates 6, a moving platform 8 is provided with a welding head assembly 9, the welding head assembly 9 comprises two welding heads 3, the two welding heads 3 are connected with a laser 1 through optical fibers 2, laser beams emitted by the laser 1 are transmitted through the optical fibers 2 and respectively pass through the two welding heads 3, and an included angle A is formed between the two welding heads 3, so that the relative angle of the two laser beams passing through the two welding heads 3 is 60-90 degrees, and the focuses of the two laser beams are focused on the butt joint part of the two butt-welded transparent plastic plates 6.
The laser 1 is at least a semiconductor laser, the laser 1 emits laser beams with the wavelength of 1700 nm-2000 nm, the output power of the laser 1 is 30-100W, the stable fluctuation value of the output power is less than 3%, and the beam quality M2The factor is less than 1.5.
The motion platform 8 is a three-axis linear motion platform, and the two welding heads 3 respectively realize an actuating mechanism of a two-dimensional plane through the motion platform 8. The repeated positioning precision of the motion platform 8 is +/-0.02 mm, and the motion platform is an actuating mechanism for realizing a two-dimensional plane.
The moving platform 8 comprises a first sliding table 8.1, a second sliding table 8.2 and a third sliding table 8.3.
In this embodiment, a rectangular support frame 24 is arranged on the working table 7, and the support frame 24 is provided with a first sliding table 8.1 and a second sliding table 8.2; a sliding assembly is arranged between the first sliding table 8.1 and the second sliding table 8.2, the second sliding table 8.2 and the first sliding table 8.1 form relative motion through the sliding assembly, the second sliding table 8.2 is provided with a third sliding table 8.3, and the second sliding table 8.2 drives the third sliding table 8.3 to slide on the first sliding table 8.1 in a reciprocating manner; in addition, the third sliding table 8.3 is in sliding fit with the second sliding table 8.2, and the welding head fixing block 13 is connected with the third sliding table 8.3, so that the third sliding table 8.3 drives the two welding heads 3 to slide on the second sliding table 8.2 in a reciprocating manner through the welding head fixing block 13.
The third sliding table 8.3 is provided with a lifting screw rod or a lifting guide rail or a sliding block corresponding to the welding head fixing block 13, so that the two welding heads 3 can be lifted up and down on the third sliding table 8.3.
The material of the radiating fin 5 is at least quartz glass or sapphire glass, and in order to ensure sufficient radiating efficiency and not obviously consume laser energy, the heat conductivity coefficient of the radiating fin 5 at the temperature of 150-300 ℃ is more than 1.0W/m.K, and the absorptivity of laser beams with the wavelength of 1700-2000 nm is less than 5%.
Referring to fig. 2-3, the tooling clamp assembly 10 includes a tooling bottom plate 14, an electrically or pneumatically driven upper and lower pressing member 15, and a horizontal pressing member 16, wherein the tooling bottom plate 14 is provided with more than two sliding guide posts 19, two pressing cylinders 22, and a plastic plate supporting fitting piece 23; the pressing cylinder 22 is provided with a pressing plate 18, the pressing plate 18 is provided with an opening part, the opening part is provided with a transparent radiating fin 5, more than two sliding guide posts 19 respectively penetrate through the pressing plate 18, the pressing plate 18 is positioned above the plastic plate supporting and matching part 23, and the pressing plate 18 and the pressing cylinder 22 are connected in a matching mode so that the pressing plate 18 can move up and down along the sliding guide posts 19. A guide sleeve is arranged between the pressing plate 18 and the sliding guide post 19 and plays a role in guiding, and sliding friction between the pressing plate 18 and the sliding guide post 19 is reduced. The compressing cylinder 22, the pressing plate 18 and the radiating fins 5 jointly realize the up-and-down compression of the two butt-welded transparent plastic plates 6, so that the compressing cylinder 22 and the pressing plate 18 are combined into a pneumatic up-and-down compressing component 15.
The plastic plate supporting and matching piece 23 comprises a supporting side plate 17, a supporting flat plate 21 and an elastic piece 20, wherein the elastic piece 20 is arranged on the supporting flat plate 21, the supporting flat plate 21 is positioned at the top of the supporting side plate 17, one end of the elastic piece 20 abuts against the inner side of the supporting flat plate 21, the other end of the elastic piece 20 abuts against the outer side of the transparent plastic plate 6, the elastic piece 20 realizes the butt joint horizontal pressing of the transparent plastic plates 6, so that two butt-welded transparent plastic plates 6 keep horizontal pressing force in the welding process, and the butt joint horizontal pressing force of the transparent plastic plates 6 is adjusted by changing the pre-pressing force of the elastic piece 20, so that the elastic piece 20 and the supporting flat.
In this embodiment, the supporting plate 21 has a cavity corresponding to the elastic member 20 and the transparent plastic plate 6, and the elastic member 20 and the transparent plastic plate 6 are located in the cavity. Two elastic pieces 20 are adopted, and one ends of the two elastic pieces 20 are respectively abutted against the outer sides of the two transparent plastic plates 6; the other ends of the two elastic pieces 20 respectively lean against the inner sides of the cavities of the support flat plate 21; the elastic member 20 is a compression spring.
Alternatively, an elastic member 20 is used, the elastic member 20 is abutted on the outer side of one transparent plastic plate 6, and the outer side of the other transparent plastic plate 6 is contacted with the inner side of the support plate 21 to transversely press the two transparent plastic plates 6.
Referring to fig. 4, two welding heads 3 are respectively provided with a focusing lens assembly 12 and a collimating lens assembly 11 to realize focusing and collimation of the optical fiber output laser beam; the welding head 3 realizes the uniformity of laser beam spots by adjusting the installation position of the focusing lens assembly 12, and the diameter of the laser beam spots is 0.4-2.0 mm, so that the diameter of the laser beam spots is adjusted within the range; the welding head assembly 9 further comprises a welding head fixing block 13, and the two welding heads 3 are respectively fixed on the welding head fixing block 13 in an inclined mode.
The two butt-welded transparent plastic plates 6 are made of the same plastic or different melting plastics, including PMMA, ABS and the like.
Referring to fig. 5, a method for laser butt welding of transparent plastics comprises the laser butt welding device of the transparent plastics,
as shown in fig. 1, the laser butt welding device for transparent plastic comprises a laser 1, and a motion platform 8 and a tooling clamp assembly 10 which are arranged on a workbench 7, the tooling clamp assembly 10 clamps two butt welding transparent plastic plates 6, cooling fins 5 are arranged on the two butt welding transparent plastic plates 6, the motion platform 8 is a three-axis linear motion platform, a welding head assembly 9 is arranged on the motion platform 8, the welding head assembly 9 comprises two welding heads 3, the two welding heads 3 are connected with the laser 1 through optical fibers 2, two welding heads 3 are obliquely arranged, an included angle A is formed between the two welding heads 3, and a focusing lens assembly 12 and a collimating lens assembly 11 are respectively arranged on the two welding heads 3.
The welding method comprises
a. Clamping two butt-welded transparent plastic plates 6 on a tool clamp assembly 10, and adjusting pressing force;
b. and adjusting the included angle between the two welding heads 3 on the moving platform 8, and respectively adjusting the installation positions of the focusing lens assemblies 12 on the two welding heads 3.
c. Starting laser 1, two bundles of laser beams 4 are launched out to laser 1, through the transmission of optic fibre 2, pass through two soldered connections 3 respectively, see through fin 5 again, reach two 6 butt joint positions of transparent plastic board, the focus of two bundles of laser beams 4 all focuses on the butt joint position at transparent plastic board 6, the inside polymer of plastics high-speed motion under the effect of laser energy, turn into heat energy with laser energy, make butt joint position plastics produce a small amount of melting, fuse each other under the effect of anchor clamps simultaneously, form butt weld after the cooling.
By selecting welding process parameters, the temperature of the butt joint part of the two transparent plastic plates 6 is accurately controlled to be between the glass transition temperature and the thermal decomposition temperature in the welding process, so that a high-strength welding seam is formed, and the welding process parameters comprise laser power, welding speed and spot diameter.
Specifically, the method comprises the following steps: the absorption rate of the transparent plastic plate 6 to the laser beam 4 with the wavelength of 1700nm to 2000nm is 65% to 76%, and because the absorption rate of the transparent plastic plate 6 to the laser energy is high, in order to prevent the upper surface of the plastic from being melted, the radiating fins 5 need to be installed on the upper surface of the plastic, so that the appearance of the upper surface of the plastic is not affected.
The length of the optical fiber 2 is 2 to 5 m, and the inner diameter of the optical fiber 2 is 200 to 600 μm.
The two welding heads 3 are relatively static on the moving platform 8, the moving tracks of the two welding heads 3 are consistent with the welding seams of the butt joint parts of the two transparent plastic plates 6, and the welding heads 3 realize three-dimensional space curve welding along with the moving platform 8.
When the laser 1 emits a laser beam with the power of 60W, the welding speed can reach 10-20 mm/s. And through the optimized selection of welding process parameters, the temperature of the plastic at the butt joint part is ensured to be accurately controlled between the glass transition temperature and the thermal decomposition temperature in the welding process, so that a high-strength welding seam is formed.
The abutting portions of the two transparent plastic plates 6 are aligned with the opening portions of the pressing plates 18.
Second embodiment:
a laser butt welding apparatus for transparent plastics differs from the first embodiment in that: the supporting plate 21 is provided with more than one cylinder, the piston rod of the cylinder is provided with an elastic part 20, the elastic part 20 is made of rubber, the piston rod of the cylinder drives the elastic part 20 to move towards the outer side of the transparent plastic plate 6, and the transparent plastic plate 6 and the elastic part 20 are abutted to contact with each other to achieve the compression effect.
Other parts not described are the same as those of the first embodiment, and are not described in detail here.
The third embodiment:
a laser butt welding apparatus for transparent plastics differs from the first embodiment in that: the moving platform 8 is a multi-joint manipulator moving platform which comprises six manipulators, the six manipulators are provided with clamps for fixing the welding head 3, and the six manipulators drive the welding head 3 to move through the clamps; the executing mechanism for realizing the three-dimensional space curve welding track by the two welding heads 3 through the moving platform 8 is the executing mechanism for realizing the three-dimensional space welding track.
Other parts not described are the same as those of the first embodiment, and are not described in detail here.
The foregoing is a preferred embodiment of the present invention showing and describing the basic principles, main features and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are intended to illustrate the principles of the invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention, and the scope of the invention is to be protected. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. The utility model provides a transparent plastic's laser butt welding device, includes laser instrument (1) and workstation (7), is equipped with motion platform (8) on workstation (7) to and be used for frock clamp subassembly (10) of two butt welding transparent plastic boards (6) of clamping, two butt welding transparent plastic boards (6) tops are equipped with fin (5), and fin (5) cover the butt joint position of two butt welding transparent plastic boards (6) at least, its characterized in that: motion platform (8) are equipped with soldered connection subassembly (9), soldered connection subassembly (9) include two soldered connections (3), two soldered connections (3) are connected through optic fibre (2) and laser instrument (1), the laser beam of laser instrument (1) transmission passes through two soldered connections (3) respectively through optic fibre (2), and contained angle A has between two soldered connections (3), so that two bundles of laser beam relative angle through two soldered connections (3) is 60 ~ 90, the focus of two bundles of laser beams all focuses on two butt welding transparent plastic board (6) butt joint positions.
2. A device for laser butt welding of transparent plastics according to claim 1, characterized in that: the two welding heads (3) are respectively provided with a focusing lens assembly (12) and a collimating lens assembly (11); the welding head (3) realizes the uniformity of laser beam spots by adjusting the installation position of the focusing lens component (12), and the diameter of the spots is 0.4-2.0 mm; the welding head assembly (9) further comprises a welding head fixing block (13), and the two welding heads (3) are respectively fixed on the welding head fixing block (13) in an inclined mode.
3. A device for laser butt welding of transparent plastics according to claim 1, characterized in that: the laser (1) is at least a semiconductor laser, the laser (1) emits a laser beam with the wavelength of 1700 nm-2000 nm, the output power of the laser (1) is 30-100W, the stable fluctuation value of the output power is less than 3%, and the beam quality M2The factor is less than 1.5.
4. A device for laser butt welding of transparent plastics according to claim 1, characterized in that: the motion platform (8) is at least a three-axis linear motion platform or a multi-joint manipulator motion platform, and the two welding heads (3) respectively realize an executing mechanism of a two-dimensional plane or three-dimensional space curve welding track through the motion platform (8).
5. A device for laser butt welding of transparent plastics according to claim 1, characterized in that: the tool clamp assembly (10) comprises a tool bottom plate (14), an upper pressing component (15) and a lower pressing component (16) which are electrically driven or pneumatic and a horizontal pressing component (16), wherein more than two sliding guide columns (19), two pressing cylinders (22) and a plastic plate supporting matching piece (23) are arranged on the tool bottom plate (14); be equipped with clamp plate (18) on compressing tightly cylinder (22), be equipped with the opening on clamp plate (18), be equipped with transparent fin (5) on the opening, clamp plate (18) are run through respectively to more than two slip guide pillar (19), clamp plate (18) are located the top of plastic slab supporting fitting piece (23), clamp plate (18) and compressing tightly cylinder (22) cooperation are connected, so that clamp plate (18) along slip guide pillar (19) up-and-down motion, compress tightly cylinder (22), clamp plate (18), fin (5) realize compressing tightly about two butt welding transparent plastic slabs (6) jointly, so that compress tightly cylinder (22), clamp plate (18) make up into about compressing tightly component (15).
6. A device for laser butt welding of transparent plastics according to claim 5, characterized in that: the plastic plate supporting and matching piece (23) comprises a supporting side plate (17), a supporting flat plate (21) and an elastic piece (20), wherein the elastic piece (20) is arranged on the supporting flat plate (21), the supporting flat plate (21) is positioned at the top of the supporting side plate (17), one end of the elastic piece (20) abuts against the inner side of the supporting flat plate (21), the other end of the elastic piece (20) abuts against the outer side of the transparent plastic plate (6), the elastic piece (20) realizes the horizontal compression of the transparent plastic plate (6) in a butt joint mode, so that the two butt-welded transparent plastic plates (6) keep horizontal compression force in a welding process, and the horizontal compression force of the transparent plastic plate (6) is adjusted by changing the pre-compression force of the elastic piece (20), so that the elastic piece (20) and the supporting flat plate (21.
7. A device for laser butt welding of transparent plastics according to claim 1, characterized in that: the heat conductivity coefficient of the radiating fin (5) at the temperature of 150-300 ℃ is more than 1.0W/m.K, and the absorptivity of the radiating fin to laser beams with the wavelength of 1700 nm-2000 nm is less than 5%.
8. A device for laser butt welding of transparent plastics according to claim 1, characterized in that: the two butt welding transparent plastic plates (6) are made of the same plastic or different melting plastics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021316591.0U CN212603478U (en) | 2020-07-07 | 2020-07-07 | Laser butt welding device for transparent plastic |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021316591.0U CN212603478U (en) | 2020-07-07 | 2020-07-07 | Laser butt welding device for transparent plastic |
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| CN212603478U true CN212603478U (en) | 2021-02-26 |
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| CN202021316591.0U Active CN212603478U (en) | 2020-07-07 | 2020-07-07 | Laser butt welding device for transparent plastic |
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