Plastic welding device

Abstract

The embodiment of the utility model provides a plastic welding device. The plastic welding device comprises a laser assembly, a pressing plate and a bottom plate, the pressing plate and the bottom plate are located in the emitting direction of the laser assembly, a first welding piece and a second welding piece which are stacked are installed between the pressing plate and the bottom plate, and the bottom plate is arranged on the side, away from the surface of the laser assembly, of the second welding piece. The pressing plate abuts against the surface, close to the laser assembly, of the first welding piece. And the flexible supporting piece is arranged between the bottom plate and the surface, away from the laser assembly, of the second welding piece, and under the condition that the flexible supporting piece expands, the first welding piece and the second welding piece are tightly attached. Therefore, when the plastic welding part provided by the embodiment of the utility model is used for welding the first welding part and the second welding part, the welding surfaces of the first welding part and the second welding part can be ensured to be tightly attached, the processing requirements of the first welding part and the second welding part are reduced, and the welding effect between the first welding part and the second welding part is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of welding, in particular to a plastic welding device. Background Art

[0002] In the relevant plastic product production technology field, it is usually necessary to weld two plastic toolings together by laser. At present, during laser welding, one of the plastic toolings can penetrate the laser, and the other plastic tooling can absorb the laser. When the laser passes through the plastic tooling that can penetrate the laser and is absorbed by the other plastic tooling, the contact surfaces of the two plastic toolings melt and are connected into one under the action of pressure, completing the welding of the plastic toolings. In the process of plastic welding, it is usually necessary to clamp the plastic tooling to be welded by a clamping piece to ensure the welding effect.

[0003] However, when the surface of the plastic tooling to be welded and the pressing member in contact is uneven, it is difficult for the pressing member to always press against the surface of the plastic tooling to be welded, thereby reducing the pressing effect of the pressing member and making it difficult to ensure the welding effect of the plastic tooling to be welded. Utility Model Content

[0004] In order to solve or partially solve the above problems, the utility model discloses a plastic welding device to solve the problem in the prior art that the welding effect is difficult to ensure due to the uneven surface of the plastic tooling to be welded.

[0005] In order to solve the above problems, the embodiment of the utility model provides a plastic welding device, which includes: a laser assembly, and a pressing plate and a bottom plate located in the emission direction of the laser assembly, a first welding piece and a second welding piece stacked and arranged are installed between the pressing plate and the bottom plate, the bottom plate is arranged on a side of the surface of the second welding piece away from the laser assembly, and the pressing plate is pressed against the surface of the first welding piece close to the laser assembly;

[0006] A flexible support member is disposed between the bottom plate and a surface of the second welding member away from the laser assembly. When the flexible support member expands, the first welding member and the second welding member are closely fitted.

[0007] Optionally, a fluid channel is opened on the bottom plate along a first direction (Z), and the fluid channel is used to pass fluid into the flexible support member to expand the flexible support member, wherein the first direction (Z) is a direction perpendicular to the plane where the bottom plate is located.

[0008] Optionally, the welding device further comprises a fluid delivery pipe;

[0009] The fluid delivery pipe is disposed in the fluid channel, and the delivery pipe is extended toward the first direction (Z).

[0010] Optionally, the plastic welding device further comprises a pressurizing assembly, wherein the pressurizing assembly is connected to the end of the delivery pipe and is used for introducing fluid into the fluid delivery pipe.

[0011] Optionally, the fluid is any one of compressed air, nitrogen, pressurized oil, and pressurized water.

[0012] Optionally, the pressure plate includes at least a light-transmitting area, and the light-transmitting area and the welding parts of the first welding part and the second welding part are in relative positions in a first direction (Z), wherein the first direction (Z) is a direction perpendicular to the plane where the base plate is located.

[0013] Optionally, a portion of the pressing plate other than the light-transmitting area is a supporting area, and a material strength of the supporting area is greater than a material strength of the light-transmitting area.

[0014] Optionally, the material of the light-transmitting area is any one of glass material and acrylic material.

[0015] Optionally, the flexible support member is any one of an O-ring, a rubber strip, and a rubber pad.

[0016] Optionally, the plastic welding device further includes a connecting assembly;

[0017] The laser assembly, the pressing plate and the bottom plate are connected to the connecting assembly, and the distance between the pressing plate and the bottom plate is adjustable.

[0018] In the embodiment of the utility model, since the laser assembly and the pressure plate and the bottom plate located in the emission direction of the laser assembly are used to install the first welding part and the second welding part stacked between the pressure plate and the bottom plate, the bottom plate is arranged on the side of the surface of the second welding part away from the laser assembly, and the pressure plate is pressed on the surface of the first welding part close to the laser assembly, the first welding part and the second welding part can be pressed together by the pressure plate and the bottom plate. In addition, since the flexible support is arranged between the bottom plate and the second welding part away from the surface of the laser assembly, when the flexible support expands, the first welding part and the second welding part are closely fitted, so the second welding part can be given a thrust close to the first welding part by the flexible support, thereby causing the contact surface between the first welding part and the second welding part to deform and achieve close fitting. In summary, the plastic welding part provided in the embodiment of the utility model can ensure that the welding surfaces between the first welding part and the second welding part are closely fitted when welding the first welding part and the second welding part, reduce the processing requirements of the first welding part and the second welding part, and ensure the welding effect between the first welding part and the second welding part. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a structural schematic diagram of a plastic welding device provided by an embodiment of the utility model.

[0021] Description of reference numerals:

[0022] 1-laser assembly; 2-pressing plate; 3-bottom plate; 4-first welding part; 5-second welding part; 6-flexible support part; 7-fluid delivery pipe. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] It should be understood that the references to "one embodiment" or "an embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present invention. Therefore, the references to "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0025] Figure 1 Schematic diagram of a plastic welding device provided by an embodiment of the utility model. Figure 1 As shown, the plastic welding device comprises:

[0026] A laser assembly 1 and a pressing plate 2 and a bottom plate 3 located in the emission direction of the laser assembly 1, a first welding member 4 and a second welding member 5 stacked and arranged are installed between the pressing plate 2 and the bottom plate 3, the bottom plate 3 is arranged on a side of the second welding member 5 away from the surface of the laser assembly 1, and the pressing plate 2 is pressed against the surface of the first welding member 4 close to the laser assembly 1;

[0027] The flexible support member 6 is arranged between the bottom plate 3 and the surface of the second welding member 5 away from the laser assembly 1. When the flexible support member 6 expands, the first welding member 4 and the second welding member 5 are tightly fitted.

[0028] It can be seen from the above embodiments that in the embodiments of the utility model, since the laser assembly 1 and the pressing plate 2 and the bottom plate 3 located in the emission direction of the laser assembly 1 are used to install the first welding part 4 and the second welding part 5 stacked between the pressing plate 2 and the bottom plate 3, the bottom plate 3 is arranged on the side of the surface of the second welding part 5 away from the laser assembly 1, and the pressing plate 2 is pressed on the surface of the first welding part 4 close to the laser assembly 1, so the first welding part 4 and the second welding part 5 can be pressed together by the pressing plate 2 and the bottom plate 3. In addition, since the flexible support member 6 is arranged between the bottom plate 3 and the second welding part 5 away from the surface of the laser assembly 1, when the flexible support member 6 expands, the first welding part 4 and the second welding part 5 are tightly fitted, so the flexible support member 6 can give the second welding part 5 a thrust close to the first welding part 4, thereby causing the contact surface between the first welding part 4 and the second welding part 5 to deform and achieve tight fit. To sum up, the plastic welding part provided in the embodiment of the utility model can ensure that the welding surfaces between the first welding part 4 and the second welding part 5 are tightly fitted when welding the first welding part 4 and the second welding part 5, thereby reducing the processing requirements of the first welding part 4 and the second welding part 5 and ensuring the welding effect between the first welding part 4 and the second welding part 5.

[0029] It should be noted that, when welding, the plastic welding device provided by the embodiment of the utility model has the first welding part 4 and the second welding part 5 stacked, wherein the first welding part 4 is close to the laser assembly 1, and the second welding part 5 is far away from the laser assembly 1, the welding area of ​​the first welding part 4 is made of laser-transmitting material, and the welding area of ​​the second welding part 5 is made of laser-absorbing material.

[0030] In addition, the laser assembly 1 is a device or assembly that uses the heat generated by the laser beam to melt the plastic contact surface, thereby bonding thermoplastic sheets, films or molded parts together. Exemplarily, the process of the laser assembly 1 can be laser transmission welding. The process of this technology is: first clamp the first welding part 4 and the second welding part 5 together, and then direct a beam of short-wave infrared laser to the part to be bonded. The laser beam passes through the first welding part 4 and is then absorbed by the second welding part 5. The laser energy is absorbed so that the material temperature of the second welding part 5 increases, melting the first welding part 4 and the second welding part 5, so that the first welding part 4 and the second welding part 5 are bonded. Common laser equipment can be laser welding equipment such as neodymium-doped yttrium aluminum garnet synthetic crystal equipment, semiconductor diode equipment or carbon dioxide laser equipment, which is not limited in the embodiment of the utility model.

[0031] In the embodiment of the utility model, the pressing plate 2 is a plate-like structure, which, on the one hand, enables the first welding part 4 and the second welding part 5 to have a relatively stable pressing surface, and on the other hand, facilitates the installation and fixation of the pressing plate 2. In addition, in some embodiments, the pressing plate 2 may include a connecting portion and a pressing portion, which are stacked and arranged between the connecting portion and the pressing portion, and a T-shaped plate-like structure is formed between the connecting portion and the pressing portion, that is, the area of ​​the positive projection of the pressing portion on the bottom plate 3 is smaller than the area of ​​the positive projection of the connecting portion on the bottom plate 3, so that the area of ​​the pressing plate 2 in contact with the surface of the first welding part 4 close to the laser assembly 1 is smaller, thereby enabling the first welding part 4 and the second welding part 5 to be subjected to a greater pressure from the pressing plate 2. In addition, the pressing plate 2 can provide a clamping force to the pressing plate 2 through a driving mechanism such as a motor screw structure and a cylinder structure, or can provide a clamping force to the pressing plate 2 through a mechanical fixing method such as bolt fixing, elbow clamping and clamping, or provide a clamping force to the pressing plate 2 through other methods, which is not limited in the embodiment of the utility model.

[0032] A bottom plate 3 is provided on the side of the pressing plate 2 away from the bottom plate 3. The bottom plate 3 is mainly used to provide support force for the first welding part 4 and the second welding part 5. The pressing plate 2 can be a plate-shaped structure. Since the plane of the bottom plate 3 is relatively flat, when the bottom plate 3 and the second welding part 5 are directly in contact with the surface away from the laser assembly 1, if the surface of the second welding part 5 is uneven or the surface of the first welding part 4 is uneven (such as the surface of the second welding part 5 has a convex rib or a groove structure or the surface of the second welding part 5 has a convex rib or a groove structure), there is a gap between the first welding part 4 and the second welding part 5, and they cannot fit tightly, thereby reducing the welding effect between the first welding part 4 and the second welding part 5. Based on this, in the embodiment of the utility model, the plastic welding device provided by the embodiment of the utility model further includes a flexible support member 6, which is arranged between the bottom plate 3 and the second welding part 5 away from the surface of the laser assembly 1. In this way, the thrust generated by the expansion of the flexible support member 6 can make the first welding part 4 and the second welding part 5 fit tightly under the action of the thrust of the flexible support member 6. It should be noted that the flexible support member 6 can be filled with fluid from at least one direction such as the top, bottom or side, so that the flexible support member 6 expands, or the flexible support member 6 can also expand through special internal expansion materials, or other methods, which are not limited in the embodiments of the present utility model.

[0033] It should be noted that the flexible support member 6 can be a square plate structure, a circular plate structure, or a ring structure, or other structures, and the embodiment of the utility model does not limit this. The flexible support member 6 can be determined according to the area of ​​the region where the welding part between the first welding member 4 and the second welding member 5 is located. The flexible support member 6 can make the welding part between the first welding member 4 and the second welding member 5 more supported, so that the compression area between the first welding member 4 and the second welding member 5 is larger, and then the welding line width between the first welding member 4 and the second welding member 5 is larger [the size of the welding part between the first welding member 4 and the second welding member 5 in the second direction (X), the second direction (X) is the length direction of the plane where the bottom plate 3 is located]. In this way, by increasing the welding line width between the first welding member 4 and the second welding member 5, the number of welding times between the first welding member 4 and the second welding member 5 can be reduced, and the welding efficiency between the first welding member 4 and the second welding member 5 can be improved.

[0034] It should also be noted that according to Figure 1 In the embodiment of the present invention, the X-axis direction and the Z-axis direction intersect. For the sake of convenience, the first direction is defined as the Z-axis direction (that is, the direction perpendicular to the plane where the bottom plate 3 is located in the embodiment of the present invention), and the second direction is defined as the X-axis direction (that is, the length direction of the plane where the bottom plate 3 is located in the embodiment of the present invention). Further explanation: the definition of vertical in the specification should be understood as vertical within a 10% fluctuation of 90 degrees, that is, the angle between the first direction and the second direction defined should be understood as vertical if it is between 80 degrees and 90 degrees.

[0035] In some feasible embodiments, a fluid channel is opened on the bottom plate 3 along the first direction (Z), and the fluid channel is used to pass fluid into the flexible support member 6 to expand the flexible support member 6, wherein the first direction (Z) is a direction perpendicular to the plane where the bottom plate 3 is located.

[0036] In this embodiment, the fluid channel can be a circular hole structure, a square hole structure, or a hole structure of other shapes, and the fluid channel should penetrate two opposite surfaces of the bottom plate 3 in the first direction (Z) (i.e., the surface of the bottom plate 3 close to the pressing plate 2 and the surface of the bottom plate 3 away from the pressing plate 2). In this way, when the fluid enters between the bottom plate 3 and the flexible support member 6 through the fluid channel, the fluid enters from the bottom of the flexible support member 6. Compared with entering from the side and top of the flexible support member 6, the flow path of the fluid is smaller, which is not only conducive to the entry of the fluid, but also can reduce the loss of the fluid in the process of entering between the bottom plate 3 and the flexible support member 6.

[0037] Furthermore, in some embodiments, the welding device also includes a fluid delivery tube 7; the fluid delivery tube 7 is arranged in the fluid channel, and the delivery tube is extended in the first direction (Z). The structure of the fluid delivery tube 7 is determined according to the shape of the fluid channel. For example, when the fluid channel can be a circular hole structure, the fluid delivery tube 7 is a circular tube, and when the fluid channel can be a square hole structure, the fluid delivery tube 7 is a square tube. In this way, the fluid is directly delivered through the fluid delivery tube 7, which can further reduce the loss of the fluid in the process of entering between the bottom plate 3 and the flexible support member 6. It should be noted that, in order to ensure the sealing of the fluid, a seal can also be provided between the outer wall of the fluid delivery tube 7 and the hole wall of the fluid channel to further reduce the loss of the fluid in the process of entering between the bottom plate 3 and the flexible support member 6.

[0038] Optionally, in some embodiments, the plastic welding device further includes a pressurizing component, which is connected to the end of the delivery pipe and is used to supply fluid to the fluid delivery pipe 7 .

[0039] It should be noted that the boost component can be at least one of a high-pressure pump, an air compressor or an electronic supercharger. The specific type of the boost component is determined according to the type of fluid, and the embodiment of the utility model does not limit this. Exemplarily, when the fluid is compressed air, the boost component can be an air compressor. In this way, by connecting the boost component to the end of the delivery pipe, the expansion degree of the flexible support member 6 can be automatically controlled, and the degree of fit between the first welding member 4 and the second welding member 5 can be further ensured.

[0040] For the above fluid, in some embodiments, the fluid is any one of compressed air, nitrogen, pressurized oil, and pressurized water, and the embodiments of the utility model do not limit this. When the fluid is any one of compressed air, nitrogen, pressurized oil, and pressurized water, the stability of the fluid can be guaranteed, and the introduction of high pressure can avoid affecting the life and structure of the flexible support member 6.

[0041] Furthermore, the flexible support member 6 is any one of an O-ring, a rubber strip, and a rubber pad, and the embodiments of the utility model do not limit this. It should be noted that no matter whether the flexible support member 6 is an O-ring, a rubber strip, or a rubber pad, it can ensure that the flexible support member 6 expands under the action of the fluid, and when the spacing between the bottom plate 3 and the second welding member 5 is fixed, the flexible support member 6 can give the second welding member 5 a thrust close to the first welding member, thereby causing the contact surface between the first welding member 4 and the second welding member 5 to deform and achieve a close fit.

[0042] It should be noted that the pressure generated by the expansion of the flexible support member 6 can make the first welding part 4 and the second welding part 5 fit tightly under the pressure of the flexible support member 6, so that the entire welding process does not require the participation of friction parts (balls in ball welding), so there is no part loss, and it is not affected by the structure of the first welding part 4 and the second welding part 5, thereby improving the welding speed and welding efficiency of the plastic welding device.

[0043] Furthermore, in some feasible embodiments, the pressure plate 2 includes at least a light-transmitting area, and the light-transmitting area and the welding parts of the first welding part 4 and the second welding part 5 are in relative positions in a first direction (Z), wherein the first direction (Z) is a direction perpendicular to the plane where the base plate 3 is located.

[0044] It should be noted that the material of the light-transmitting area includes materials that are transparent to visible light (wavelength 0.39-0.76 μm), infrared light (wavelength 1-1000 μm) and ultraviolet light (wavelength 0.01-0.4 μm). The light-transmitting materials include inorganic light-transmitting materials, polymer light-transmitting materials and light-transmitting composite materials. Exemplarily, the material of the light-transmitting area can be glass materials, acrylic materials and other light-transmitting materials, which are not limited in the embodiments of the present invention. The pressing plate 2 can be a plate made of light-transmitting material for the entire plate, or a part of the plate can be made of light-transmitting material, which is not limited in the embodiments of the present invention. In this way, since the pressing plate 2 at least includes a light-transmitting area, and the light-transmitting area and the welding part of the workpiece 4 to be welded are in relative positions in the first direction (X), it can be ensured that the light of the laser assembly 11 can pass through the pressing plate 2 to reach the workpiece 4 to be welded.

[0045] Optionally, in some embodiments, the portion of the pressing plate 2 other than the light-transmitting area is a supporting area, and the material strength of the supporting area is greater than the material strength of the light-transmitting area.

[0046] In this embodiment, since the portion of the pressure plate 2 other than the light-transmitting area is the supporting area, the material strength of the supporting area is greater than that of the light-transmitting area. Therefore, the overall strength of the pressure plate 2 can be enhanced through the supporting area. On the one hand, it is convenient to improve the pressure strength of the pressure plate 2 on the first welding part 4 and the second welding part 5. On the other hand, it is convenient to improve the overall strength of the pressure plate 2, reduce the probability of the pressure plate 2 breaking, and increase the service life of the pressure plate 2.

[0047] Next, the assembly method between the pressing plate 2 and the bottom plate 3 provided by the embodiment of the utility model is specifically introduced as follows:

[0048] In some feasible embodiments, the plastic welding device further includes a connecting component; the laser component 1, the pressing plate 2 and the bottom plate 3 are connected to the connecting component, and the distance between the pressing plate 2 and the bottom plate 3 is adjustable.

[0049] It should be noted that the connection assembly may include a first connection plate, a second connection plate and a third connection plate, the first connection plate and the third connection plate are respectively connected to the two ends of the second connection plate, the second connection plate may extend along the emission direction of the laser assembly 1, the first connection plate is arranged parallel to the plane where the bottom plate 3 is located, and the third connection plate extends parallel to the plane where the bottom plate 3 is located. In this way, the bottom plate 3 can be fixed on the second connection plate, the laser assembly 1 can be fixed on the first connection plate, and the pressure plate 2 can be fixed on the third connection plate. In this way, by assembling the laser assembly 1, the bottom plate 3 and the pressure plate 2 on the connection assembly, the integrated installation of the entire plastic welding device can be achieved, which is more conducive to the simplified setting of the structure of the plastic welding device.

[0050] As for the adjustable distance between the pressing plate 2 and the bottom plate 3, in the above embodiment, the end of the bottom plate 3 can be connected to the connecting assembly by means of clamping, riveting or threaded connection, so as to facilitate the disassembly and assembly of the supporting bottom plate 3, thereby reducing the installation cost of the plastic welding device. In addition, in some embodiments, a sliding groove can be provided on the connecting assembly so that the end of the bottom plate 3 is slidably connected to the connecting assembly, and the supporting bottom plate 3 can slide along the emission direction of the laser assembly 1, so that when the type of the laser assembly 1 changes, the laser melting point of the laser assembly 1 changes due to welding, or the thickness of the first welding part 4 and the thickness of the second welding part 5 change, the distance between the pressing plate 2 and the bottom plate 3 can be adjusted, so that the bottom plate 3 and the pressing plate 2 can adapt to different types of laser assemblies 1 and first welding parts 4 and second welding parts 5 of different thicknesses.

[0051] It can be seen from the above embodiments that in the embodiments of the utility model, since the laser assembly 1 and the pressing plate 2 and the bottom plate 3 located in the emission direction of the laser assembly 1 are used to install the first welding part 4 and the second welding part 5 stacked between the pressing plate 2 and the bottom plate 3, the bottom plate 3 is arranged on the side of the surface of the second welding part 5 away from the laser assembly 1, and the pressing plate 2 is pressed on the surface of the first welding part 4 close to the laser assembly 1, so the first welding part 4 and the second welding part 5 can be pressed together by the pressing plate 2 and the bottom plate 3. In addition, since the flexible support member 6 is arranged between the bottom plate 3 and the second welding part 5 away from the surface of the laser assembly 1, when the flexible support member 6 expands, the first welding part 4 and the second welding part 5 are tightly fitted, so the flexible support member 6 can give the second welding part 5 a thrust close to the first welding part, thereby causing the contact surface between the first welding part 4 and the second welding part 5 to deform and achieve tight fit. To sum up, the plastic welding part provided in the embodiment of the utility model can ensure that the welding surfaces between the first welding part 4 and the second welding part 5 are tightly fitted when welding the first welding part 4 and the second welding part 5, thereby reducing the processing requirements of the first welding part 4 and the second welding part 5 and ensuring the welding effect between the first welding part 4 and the second welding part 5.

[0052] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0053] Although the preferred embodiments of the utility model embodiments have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the utility model embodiments.

[0054] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0055] The utility model has been introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model. At the same time, for general technicians in this field, according to the idea of ​​the utility model, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the utility model.

Claims

1. A plastic welding device, characterized in that: The plastic welding device comprises: A laser assembly and a pressing plate and a bottom plate located in the emission direction of the laser assembly, wherein a first welding piece and a second welding piece stacked in layers are installed between the pressing plate and the bottom plate, the bottom plate is arranged on a side of the second welding piece away from the surface of the laser assembly, and the pressing plate is pressed against a surface of the first welding piece close to the laser assembly; A flexible support member is disposed between the bottom plate and a surface of the second welding member away from the laser assembly. When the flexible support member expands, the first welding member and the second welding member are closely fitted.

2. The plastic welding device according to claim 1, characterized in that: A fluid channel is provided on the bottom plate along a first direction (Z), and the fluid channel is used to pass fluid into the flexible support member to expand the flexible support member, wherein the first direction (Z) is a direction perpendicular to the plane where the bottom plate is located.

3. The plastic welding device according to claim 2, characterized in that: The welding device also includes a fluid delivery pipe; The fluid delivery pipe is disposed in the fluid channel, and the delivery pipe is extended toward the first direction (Z).

4. The plastic welding device according to claim 3, characterized in that: The plastic welding device further comprises a pressurizing assembly, which is connected to the end of the delivery pipe and is used for introducing fluid into the fluid delivery pipe.

5. The plastic welding device according to claim 2, characterized in that: The fluid is any one of compressed air, nitrogen, pressurized oil and pressurized water.

6. The plastic welding device according to claim 1, characterized in that: The pressure plate includes at least a light-transmitting area, and the light-transmitting area and the welding parts of the first welding part and the second welding part are in relative positions in a first direction (Z), wherein the first direction (Z) is a direction perpendicular to the plane where the base plate is located.

7. The plastic welding device according to claim 6, characterized in that: The portion of the pressing plate other than the light-transmitting area is a supporting area, and the material strength of the supporting area is greater than the material strength of the light-transmitting area.

8. The plastic welding device according to claim 6, characterized in that: The material of the light-transmitting area is any one or more of glass material and acrylic material.

9. The plastic welding device according to claim 1, characterized in that: The flexible support member is any one or more of an O-ring, a rubber strip, and a rubber pad.

10. The plastic welding device according to claim 1, characterized in that: The plastic welding device also includes a connecting assembly; The laser assembly, the pressing plate and the bottom plate are connected to the connecting assembly, and the distance between the pressing plate and the bottom plate is adjustable.

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