A plastic welding machine

Abstract

The utility model belongs to the technical field of welding equipment, concretely relates to a plastic welding machine for welding plastic parts, including frame and the laser welding device, at least one conveying device and at least one positioning device connected to the frame, and the positioning device includes light transmission presser and at least one telescopic component, and the telescopic component is connected with the frame, and the light transmission presser is connected with the telescopic end of telescopic component, and the light transmission presser is located between the laser head of laser welding device and the conveying end of conveying device. The utility model improves structure, is convenient for the worker to feed, and there is no ascending action of plastic parts, can reduce the probability of the displacement of unwelded plastic parts, improves welding effect.

Description

Technical Field

[0001] This utility model belongs to the technical field of welding equipment, and specifically relates to a plastic welding machine. Background Technology

[0002] Laser welding is a highly efficient and precise welding method that uses a high-energy-density laser beam as a heat source. It is an important application of laser materials processing technology. In the 1970s, it was mainly used for welding thin-walled materials and low-speed welding. The welding process is heat conduction type; the laser radiation heats the surface of the workpiece, and the surface heat diffuses inward through heat conduction. By controlling parameters such as the width, energy, peak power, and repetition frequency of the laser pulse, the workpiece is melted, forming a specific molten pool. Due to its unique advantages, it has been successfully applied to the precision welding of micro and small parts. Laser welding technology uses the heat generated by a laser beam to melt the plastic contact surfaces, thereby bonding thermoplastic sheets, films, or molded parts together.

[0003] Chinese utility model CN222039637U discloses a plastic welding device, including a machine base, a synchronous guide column lifting platform, a material-carrying boss, a glass top plate, a Z-axis rodless cylinder, and a laser welding machine. The machine base is equipped with a synchronous guide column lifting platform, and a material-carrying boss is movably disposed on the surface of the synchronous guide column lifting platform. The glass top plate is horizontally mounted on the top of the synchronous guide column lifting platform. The synchronous guide column lifting platform is directly driven by the Z-axis rodless cylinder. The material-carrying boss can support the bottom surface of the glass top plate. The laser welding machine is correspondingly disposed above the glass top plate. This technical solution connects the synchronous guide column lifting platform with the x-axis servo linear module. The synchronous guide column lifting platform pushes the loading boss to the bottom surface of the glass top plate, and then laser welding is performed. Each time the material is loaded, the entire guide column lifting platform needs to be moved out to the loading area. Furthermore, the glass top plate will affect the workers' placement of plastic parts onto the loading boss. In addition, plastic parts are prone to separation when they are not welded. When the guide column lifting platform rises, it may cause the plastic parts to shift, thereby reducing the welding effect.

[0004] Therefore, there is an urgent need to propose a new technical solution to address the above problems. Utility Model Content

[0005] The purpose of this utility model is to provide a plastic welding machine that addresses the shortcomings of existing technologies. By improving the structure, it facilitates material loading for workers and eliminates the upward movement of plastic parts, thereby reducing the probability of displacement of unwelded plastic parts and improving the welding effect.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A plastic welding machine includes a frame and a laser welding device, at least one conveying device, and at least one positioning device connected to the frame. The positioning device includes a light-transmitting pressure plate and at least one telescopic component. The telescopic component is connected to the frame, and the light-transmitting pressure plate is connected to the telescopic end of the telescopic component. The light-transmitting pressure plate is located between the laser head of the laser welding device and the conveying end of the conveying device.

[0007] Preferably, the positioning device further includes a mounting plate and a guide post. The mounting plate is connected to the telescopic end of the telescopic assembly. The side of the mounting plate has a through hole. The light-transmitting pressure plate is correspondingly arranged with the through hole. The guide post is connected to the frame. The guide post is slidably connected to a guide member. The guide member is connected to the mounting plate.

[0008] Preferably, the mounting plate is connected to a buffer, the frame is connected to a limit post, and the buffer and the limit post are correspondingly arranged.

[0009] Preferably, the conveying device includes a guide rail, a first lead screw, a first motor, and a placement platform. The guide rail is connected to the frame, the placement platform is slidably connected to the guide rail, the first lead screw is arranged parallel to the guide rail and threadedly connected to the placement platform, and the first motor is mounted on the guide rail and drivenly connected to the first lead screw.

[0010] Preferably, the placement platform is provided with a baffle, and a first photoelectric sensor, a second photoelectric sensor, and a third photoelectric sensor are sequentially provided on the side of the guide rail. The baffle is provided in correspondence with the first photoelectric sensor, the second photoelectric sensor, and the third photoelectric sensor. The first photoelectric sensor, the second photoelectric sensor, the third photoelectric sensor, and the first motor are all electrically connected to the control system.

[0011] Preferably, a transfer device is connected to the frame. The transfer device includes a base, a second lead screw, a second motor, and a connector. The base is connected to the frame, the laser welding device is connected to the connector, the connector is slidably connected to the base, the second lead screw is arranged parallel to the base and threadedly connected to the connector, and the second motor is mounted on the base and driven by the second lead screw.

[0012] Preferably, the top of the base is provided with at least one slide rail, the connector is connected to a slider, and the slider and the slide rail are slidably connected.

[0013] Preferably, the frame is connected to a lifting device, the connecting piece is connected to the body of the lifting device, and the lifting end of the lifting device is connected to the laser welding device.

[0014] Preferably, there are two conveying devices, and a first switch, a second switch, and a third switch are sequentially arranged on the frame; wherein, the first switch is a common switch and is connected in series on the power bus; the second switch is connected in series with one of the conveying devices to form an independent control branch; and the third switch is connected in series with the other conveying device to form another independent control branch.

[0015] Preferably, the rack is connected to at least one grating; wherein the mounting position of the grating includes any one or a combination of the following: a) Located between the conveying device and the first switch and the second switch; b) Located between the conveying device and the first switch and the third switch.

[0016] The beneficial effects of this utility model are as follows: This utility model includes a frame and a laser welding device connected to the frame, at least one conveying device, and at least one positioning device. The positioning device includes a light-transmitting pressure plate and at least one telescopic component. The telescopic component is connected to the frame, and the light-transmitting pressure plate is connected to the telescopic end of the telescopic component. The telescopic end of the telescopic component refers to the end of the telescopic component that can extend and retract. The light-transmitting pressure plate can be quartz glass and is used to press the plastic parts to be welded. The telescopic component can be a telescopic cylinder or a telescopic motor, preferably a telescopic cylinder. The side of the light-transmitting pressure plate is connected to the telescopic rod end of the telescopic cylinder. The cylinder body of the telescopic cylinder is connected to the frame. There can be multiple plastic parts. After multiple plastic parts to be welded are combined, they are placed at the conveying end of the conveying device. Then, the conveying device transports the combined plastic parts to the bottom of the light-transmitting pressure plate. The telescopic cylinder drives the light-transmitting pressure plate to descend and press the combined plastic parts. Finally, the laser welding device is started to weld the combined plastic parts. The light-transmitting pressure plate is located between the laser head of the laser welding device and the conveying end of the conveying device. This invention improves the structure, making it easier for workers to load materials. Furthermore, by eliminating the upward movement of plastic parts, it reduces the probability of displacement of unwelded plastic parts and improves the welding effect. Attached Figure Description

[0017] Figure 1 This is one of the exploded views of this utility model.

[0018] Figure 2 This is an exploded view of the positioning device of this utility model.

[0019] Figure 3 This is a schematic diagram of the structure of the laser welding device, lifting device, and transfer device of this utility model.

[0020] Figure 4 This is one of the overall structural schematic diagrams of this utility model.

[0021] Figure 5This is a schematic diagram of the circuit connection of the first switch, second switch, third switch and conveying device of this utility model.

[0022] Figure 6 This is the second exploded view of this utility model.

[0023] Figure 7 This is the second schematic diagram of the overall structure of this utility model.

[0024] The components include: 1. Frame; 11. First switch; 12. Second switch; 13. Third switch; 14. First workstation; 15. Second workstation; 2. Laser welding device; 3. Conveying device; 31. Guide rail; 311. First photoelectric sensor; 312. Second photoelectric sensor; 313. Third photoelectric sensor; 32. First lead screw; 33. First motor; 34. Placement platform; 341. Baffle; 4. Positioning device; 41. Light-transmitting pressure plate; 42. Telescopic component; 43. Mounting plate; 431. Through hole; 44. Guide post; 45. Guide component; 46. Buffer; 47. Limiting post; 48. Fixing component; 5. Transfer device; 51. Base; 52. Second lead screw; 53. Second motor; 54. Connecting component; 55. Slide rail; 56. Slider; 6. Lifting device; 7. Grating. Detailed Implementation

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0026] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0027] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0028] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0029] The following is in conjunction with the appendix Figures 1-7 The present invention will be further described in detail with reference to specific embodiments, but this is not intended to limit the present invention.

[0030] Example 1 A plastic welding machine for welding plastic parts, such as Figures 1-6 As shown, the system includes a frame 1 and a laser welding device 2, at least one conveying device 3, and at least one positioning device 4 connected to the frame 1. The positioning device 4 includes a light-transmitting pressure plate 41 and at least one telescopic component 42. The telescopic component 42 is connected to the frame 1, and the light-transmitting pressure plate 41 is connected to the telescopic end of the telescopic component 42. The telescopic end of the telescopic component 42 refers to the end of the telescopic component 42 that can extend and retract. The light-transmitting pressure plate 41 can be made of quartz glass and is used to press the plastic parts to be welded. The telescopic component 42 can be a telescopic cylinder or a telescopic motor, preferably a telescopic cylinder. The side of the light-transmitting pressure plate 41 is connected to the telescopic rod end of the telescopic cylinder. The cylinder body of the telescopic cylinder is connected to the frame 1. The connection process involves multiple plastic parts. These parts are assembled and placed at the conveying end of the conveying device 3. The conveying device 3 then transports the assembled plastic parts to below the light-transmitting pressure plate 41. A telescopic cylinder drives the light-transmitting pressure plate 41 to descend and press the assembled plastic parts together. Finally, the laser welding device 2 is activated to weld the assembled plastic parts. The light-transmitting pressure plate 41 is positioned between the laser head of the laser welding device 2 and the conveying end of the conveying device 3. The conveying end of the conveying device 3 refers to the movable feeding end of the conveying device 3. It should be noted that the conveying end of the conveying device 3 and the positioning device 4 are not directly connected, but only cooperate with each other. This structural improvement facilitates worker loading and eliminates the upward movement of the plastic parts, reducing the probability of displacement of unwelded plastic parts and improving the welding effect.

[0031] In this embodiment, the positioning device 4 further includes a mounting plate 43 and a guide post 44. The mounting plate 43 is connected to the telescopic end of the telescopic assembly 42. Four telescopic assemblies 42 are provided, and they are respectively arranged on two opposite outer sides of the conveying device 3. Two telescopic assemblies 42 are provided on each outer side, and the positions of the two outer telescopic assemblies 42 correspond to each other. The surface of the mounting plate 43 is provided with mounting holes. The telescopic end of the telescopic assembly 42 passes through the mounting holes and is connected to the mounting plate 43. The side of the mounting plate 43 has a through hole 431. A light-transmitting pressure plate 41 is arranged corresponding to the through hole 431. The side wall of the through hole 431 has a step. The light-transmitting pressure plate 41 is placed on the step. A fixing member 48 for pressing the light-transmitting pressure plate 41 is provided at the through hole 431. The fixing member 48 is a ring. The structure has a light-transmitting pressure plate 41 with one side edge abutting against the surface of the step, and the other side edge abutting against the side of the fixing member 48. The fixing member 48 is connected to the mounting plate 43. The guide column 44 is set along the Z-axis direction. There are two guide columns 44, which are respectively set on the two opposite outer sides of the conveying device 3. One end of the guide column 44 is connected to the frame 1. The surface of the mounting plate 43 has a guide hole. The other end of the guide column 44 passes through the guide hole. The guide column 44 is slidably connected to the guide member 45. The guide member 45 is a cylindrical structure and is sleeved on the guide column 44. The guide member 45 is connected to the mounting plate 43. This arrangement can guide the lifting and lowering of the mounting plate 43, improve the stability of the lifting and lowering, and ensure the squeezing effect of the light-transmitting pressure plate 41 on the plastic parts.

[0032] In this embodiment, the mounting plate 43 is connected to a buffer 46, and the frame 1 is connected to a limit post 47. The buffer 46 and the limit post 47 are correspondingly arranged. By setting the buffer 46, the lowering speed of the mounting plate 43 can be avoided from being too fast, thus ensuring the squeezing effect of the light-transmitting pressure plate 41 on the plastic part.

[0033] In this embodiment, the telescopic component 42, the guide post 44, and the limiting post 47 are all connected to the base. By setting the base, it is convenient for the user to move the telescopic component 42, the guide post 44, and the limiting post 47.

[0034] Example 2 The embodiment differs from Embodiment 1 in that the conveying device 3 includes a guide rail 31, a first lead screw 32, a first motor 33, and a placement platform 34. The guide rail 31 is arranged along the Y-axis direction, and one side of the guide rail 31 is connected to the frame 1. The placement platform 34 is slidably connected to the guide rail 31. The first lead screw 32 is arranged parallel to the guide rail 31 and threadedly connected to the placement platform 34. The placement platform 34 includes a support block and a sliding member. A plastic part is placed on top of the support block. The sliding member is Y-shaped, forming a first end, a second end, and a third end in sequence. The top of the guide rail 31 has two strip-shaped openings, and a sliding cavity is provided inside the guide rail 31. The sliding cavity and the strip-shaped openings are connected... The sliding member has a first end set inside the sliding cavity, and a second end and a third end extended out from two strip-shaped openings in sequence. One side of the support block is connected to the second end and the third end of the sliding member. The first motor 33 is mounted on the outside of the guide rail 31, and the output shaft of the first motor 33 is connected to one end of the first lead screw 32. The first lead screw 32 is set inside the sliding cavity and is threadedly connected to the sliding member. The side of the sliding member has a first threaded hole corresponding to the first lead screw 32. The output shaft of the first motor 33 drives one end of the first lead screw 32 to rotate. The first lead screw 32 can drive the sliding member to move, thereby driving the support block to move along the Y-axis.

[0035] In this embodiment, the placement platform 34 is equipped with a baffle 341, and a first photoelectric sensor 311, a second photoelectric sensor 312, and a third photoelectric sensor 313 are sequentially arranged on the side of the guide rail 31. The baffle 341 is correspondingly arranged with the first photoelectric sensor 311, the second photoelectric sensor 312, and the third photoelectric sensor 313. The first photoelectric sensor 311, the second photoelectric sensor 312, the third photoelectric sensor 313, the first motor 33, and the laser welding device 2 are all electrically connected to the control system. The control system can be a PLC control system, used to control the operation of the first motor 33. The first photoelectric sensor 311 is set at the origin position, the second photoelectric sensor 312 is set at the welding position, and the third photoelectric sensor 313 is set at the material feeding position. By setting different photoelectric sensors, it is convenient for the motor to drive the placement platform 34 to move to the designated area.

[0036] In this embodiment, a transfer device 5 is connected to the frame 1. The transfer device 5 includes a base 51, a second lead screw 52, ​​a second motor 53, and a connector 54. The base 51 is arranged along the X-axis and is connected to the frame 1. The laser welding device 2 is connected to the connector 54, and the connector 54 is slidably connected to the base 51. The second lead screw 52 is arranged parallel to the base 51 and is threadedly connected to the connector 54. The second motor 53 is installed on the outside of the base 51, and the output shaft of the second motor 53 is drivenly connected to one end of the second lead screw 52. The end of the connector 54 is provided with a second threaded hole that matches the second lead screw 52. The output shaft of the second motor 53 can drive one end of the second lead screw 52 to rotate, and the second lead screw 52 drives the connector 54 to move, thereby driving the laser welding device 2 to move along the X-axis. The second motor 53 is electrically connected to the control system. Both the first motor 33 and the second motor 53 are servo motors.

[0037] In this embodiment, two slide rails 55 are provided on the top of the base 51, and a slider 56 is connected to the connector 54. The slider 56 and the slide rails 55 are slidably connected. The laser welding device 2 is relatively heavy. The cooperation between the slider 56 and the slide rails 55 can ensure that the connector 54 slides on the base 51 and can also support the laser welding device 2.

[0038] In this embodiment, the frame 1 is connected to a lifting device 6, and the connecting piece 54 is connected to the body of the lifting device 6. The lifting end of the lifting device 6 is connected to the laser welding device 2. The lifting end of the lifting device 6 refers to the end of the lifting device 6 used to drive the laser welding device 2 to move up and down along the Z-axis direction. The height direction of the frame 1 is the Z-axis direction. The lifting device 6 can be a lifting cylinder module. The body of the lifting device 6 and the connecting piece 54 are connected so that the laser welding device 2 can move along the X-axis direction and move up and down along the Z-axis direction.

[0039] In this embodiment, two conveying devices 3 and two positioning devices 4 are provided. A first switch 11, a second switch 12, and a third switch 13 are sequentially arranged on the frame 1. The first switch 11 is a common switch connected in series with the power bus. The second switch 12 is connected in series with one conveying device 3 to form an independent control branch. The third switch 13 is connected in series with another conveying device 3 to form another independent control branch. A first workstation 14 and a second workstation 15 are sequentially arranged on the top of the frame 1. One conveying device 3 is located at the first workstation 14, and the other conveying device 3 is located at the second workstation 15. By setting two conveying devices 3, the other conveying device 3 can be started to perform the feeding and welding process while one conveying device 3 is performing the material loading process, which effectively improves work efficiency. When starting one conveying device 3, two hands need to be pressed at the same time, which can avoid injury to the worker's hands when the conveying device 3 is started.

[0040] In this embodiment, the frame 1 is connected to at least one grating 7; wherein the mounting position of the grating 7 includes any one or a combination of the following: a) Located between the conveying device 3 and the first switch 11 and the second switch 12; b) Located between the conveying device 3 and the first switch 11 and the third switch 13.

[0041] The safety of the welding machine can be improved by setting grating 7.

[0042] The other structures in this embodiment are the same as those in Embodiment 1, and will not be described again here.

[0043] Example 3 The difference between this embodiment and Embodiment 1 is that, Figure 7 As shown, the outer side of the rack 1 is equipped with multiple baffles and cabinet doors to prevent dust from falling into the rack 1.

[0044] The other structures in this embodiment are the same as those in Embodiment 1, and will not be described again here.

[0045] Obviously, this utility model includes a frame and a laser welding device, at least one conveying device, and at least one positioning device connected to the frame. The positioning device includes a light-transmitting pressure plate and at least one telescopic component. The telescopic component is connected to the frame, and the light-transmitting pressure plate is connected to the telescopic end of the telescopic component. The telescopic end of the telescopic component refers to the end of the telescopic component that can extend and retract. The light-transmitting pressure plate can be quartz glass and is used to press the plastic parts to be welded. The telescopic component can be a telescopic cylinder or a telescopic motor, preferably a telescopic cylinder. The side of the light-transmitting pressure plate is connected to the telescopic rod end of the telescopic cylinder, and the cylinder body of the telescopic cylinder is connected to the frame. There can be multiple plastic parts. After multiple plastic parts to be welded are combined, they are placed at the conveying end of the conveying device. Then, the conveying device transports the combined plastic parts to the bottom of the light-transmitting pressure plate. The telescopic cylinder drives the light-transmitting pressure plate to descend and press the combined plastic parts. Finally, the laser welding device is started to weld the combined plastic parts. The light-transmitting pressure plate is located between the laser head of the laser welding device and the conveying end of the conveying device. This invention improves the structure, making it easier for workers to load materials. Furthermore, by eliminating the upward movement of plastic parts, it reduces the probability of displacement of unwelded plastic parts and improves the welding effect.

[0046] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, the utility model is not limited to the specific embodiments described above, and any obvious improvements, substitutions, or modifications made by those skilled in the art based on the utility model are within the protection scope of the utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on the utility model.

Claims

1. A plastic welding machine, characterized in that, The device includes a frame (1) and a laser welding device (2), at least one conveying device (3) and at least one positioning device (4) connected to the frame (1). The positioning device (4) includes a light-transmitting pressure plate (41) and at least one telescopic component (42). The telescopic component (42) is connected to the frame (1). The light-transmitting pressure plate (41) is connected to the telescopic end of the telescopic component (42). The light-transmitting pressure plate (41) is located between the laser head of the laser welding device (2) and the conveying end of the conveying device (3).

2. The plastic welding machine as described in claim 1, characterized in that, The positioning device (4) further includes a mounting plate (43) and a guide post (44). The mounting plate (43) is connected to the telescopic end of the telescopic assembly (42). The side of the mounting plate (43) has a through hole (431). The light-transmitting pressure plate (41) is correspondingly arranged with the through hole (431). The guide post (44) is connected to the frame (1). The guide post (44) is slidably connected to a guide member (45). The guide member (45) is connected to the mounting plate (43).

3. The plastic welding machine as described in claim 2, characterized in that, The mounting plate (43) is connected to a buffer (46), and the frame (1) is connected to a limit post (47). The buffer (46) and the limit post (47) are respectively set.

4. The plastic welding machine as described in claim 1, characterized in that, The conveying device (3) includes a guide rail (31), a first lead screw (32), a first motor (33), and a placement platform (34). The guide rail (31) is connected to the frame (1), and the placement platform (34) is slidably connected to the guide rail (31). The first lead screw (32) is set parallel to the guide rail (31) and threadedly connected to the placement platform (34). The first motor (33) is mounted on the guide rail (31) and is drivenly connected to the first lead screw (32).

5. The plastic welding machine as described in claim 4, characterized in that, The placement platform (34) is provided with a baffle (341), and the side of the guide rail (31) is provided with a first photoelectric sensor (311), a second photoelectric sensor (312) and a third photoelectric sensor (313) in sequence. The baffle (341) is provided in correspondence with the first photoelectric sensor (311), the second photoelectric sensor (312) and the third photoelectric sensor (313). The first photoelectric sensor (311), the second photoelectric sensor (312), the third photoelectric sensor (313) and the first motor (33) are all electrically connected to the control system.

6. The plastic welding machine as described in claim 1, characterized in that, A transfer device (5) is connected to the frame (1). The transfer device (5) includes a base (51), a second lead screw (52), a second motor (53), and a connector (54). The base (51) is connected to the frame (1), the laser welding device (2) is connected to the connector (54), and the connector (54) is slidably connected to the base (51). The second lead screw (52) is set parallel to the base (51) and threadedly connected to the connector (54). The second motor (53) is mounted on the base (51) and is drivenly connected to the second lead screw (52).

7. The plastic welding machine as described in claim 6, characterized in that, The base (51) is provided with at least one slide rail (55) on its top, and the connector (54) is connected to a slider (56), the slider (56) and the slide rail (55) being slidably connected.

8. The plastic welding machine as described in claim 6, characterized in that, The frame (1) is connected to a lifting device (6), the connector (54) is connected to the body of the lifting device (6), and the lifting end of the lifting device (6) is connected to the laser welding device (2).

9. The plastic welding machine as described in claim 1, characterized in that, There are two conveying devices (3). A first switch (11), a second switch (12) and a third switch (13) are sequentially arranged on the frame (1). The first switch (11) is a common switch connected in series on the power bus. The second switch (12) is connected in series with one of the conveying devices (3) to form an independent control branch. The third switch (13) is connected in series with the other conveying device (3) to form another independent control branch.

10. The plastic welding machine as described in claim 9, characterized in that, The frame (1) is connected to at least one grating (7); wherein the mounting position of the grating (7) includes any one or a combination of the following: a) Located between the conveying device (3) and the first switch (11) and the second switch (12); b) Located between the conveying device (3) and the first switch (11) and the third switch (13).

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