A hot gas welding device and welding method for automotive plastic parts

Abstract

This invention relates to the field of automotive parts processing equipment technology, specifically a hot gas welding device and method for automotive plastic parts. The device includes a machine body with a heating intermediate mold slidably mounted at its center. Mounting grooves are provided in the middle of the upper and lower surfaces of the heating intermediate mold. Needle plates are mounted inside the mounting grooves via screws, and the needle plates have hollow slots arranged in an array inside. A cooling box is fixed to the bottom of both side walls of the machine body. A single-outlet heating assembly includes a sliding lower cylinder slidably mounted in the inner wall of the hollow slots and an upper sliding cylinder positioned directly above the lower cylinder. A docking cylinder is fixed at the top center of the lower cylinder, and a fixing ring is fixed above the outer wall of the docking cylinder. This hot gas welding device for automotive plastic parts can adapt to the size and shape of the plastic part welding surface by adjusting the number of air needles, has a wide range of applications, allows for quick disassembly and replacement of the fixed mold, offers good safety, and enables continuous welding operations for plastic parts.

Description

Technical Field

[0001] This invention relates to the field of automotive parts processing equipment technology, and in particular to a hot gas welding equipment and welding method for automotive plastic parts. Background Technology

[0002] Automotive parts are the collective term for all components and accessories that make up a car, maintain its normal operation, improve its performance, or are repaired or replaced. They are an important part of the automotive industry, supporting a huge aftermarket and maintenance system. Among them, automotive plastic parts are common plastic products in automobiles. They utilize the properties of plastic materials to replace or partially replace traditional materials such as metal, glass, and rubber, and are widely used in various parts of modern automobiles.

[0003] However, in the manufacturing process of automotive plastic parts, multiple automotive plastic parts are welded using hot air welding equipment. Hot air welding, also known as hot air welding, mainly involves converting compressed air into an inert gas, heating it to the required temperature through a heating device, and then directing the heated gas through a series of airflow needles onto the welding ribs of the upper and lower parts. This heats and softens and melts the welding ribs. The airflow needles are then removed, and the upper and lower parts are pressed together to cool and maintain a certain pressure until they are welded together. It is a non-contact, high-cleanliness, and high-weld-strength plastic welding method. For example, the existing public document CN111703081B - A Hot Air Welding Plastic Welding Equipment and Welding Method discloses a hot air welding equipment.

[0004] While existing publicly available hot air welding equipment for automotive plastic parts can achieve welding, it still has certain shortcomings in practical use: First, existing hot air welding equipment heats the welding surface of plastic parts of a specific size using a fixed number of air needles. This method cannot adjust the number of air needles according to the size of the plastic part, nor can it heat irregular surfaces, thus limiting its applicability. Second, because the upper and lower molds are located inside the machine body, manual disassembly and assembly are required when changing positioning parts for plastic parts of different sizes. This method is inconvenient for workers, affects efficiency, and poses safety hazards. Finally, existing hot air welding equipment involves installing plastic parts in the upper and lower molds and performing hot air welding and cooling operations. Since the plastic parts require a certain amount of time to cool after welding, the equipment needs to be stopped, thus affecting the welding efficiency. Therefore, it is necessary to improve the existing technology to solve the above-mentioned technical problems. Summary of the Invention

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0006] In view of the fact that the existing hot gas welding equipment cannot adjust the number of air needles for heating according to the size of the plastic parts, and cannot heat irregular heating surfaces, thus limiting its applicability, a hot gas welding equipment for automotive plastic parts is proposed.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a hot gas welding device for automotive plastic parts, comprising a body, a heating intermediate mold slidably mounted at the center of the body, mounting grooves being provided at the center of both the upper and lower surfaces of the heating intermediate mold, a needle plate being mounted inside the mounting groove by screws, and hollow grooves being arrayed inside the needle plate; a cooling box fixedly mounted at the bottom of both side walls of the body; and a single-outlet heating assembly, comprising a sliding lower cylinder slidably mounted in the inner wall of the hollow groove and an upper sliding cylinder positioned directly above the sliding lower cylinder, a docking cylinder fixedly mounted at the center of the top of the sliding lower cylinder, and a fixing ring fixedly mounted on the upper outer wall of the docking cylinder. A first guide rod is slidably connected to the sliding holes around the ring. A first spring is fitted on the outer wall of the first guide rod. A hollow plate is fixed in the middle of the inner wall of the upper sliding cylinder. A sealing plug is installed in the air port on the hollow plate. A second guide rod is fixed at each of the four corners at the bottom of the sealing plug. The other end of the second guide rod passes through the sliding hole in the hollow plate and is connected to the moving ring. A second spring is fitted on the outer wall of the second guide rod. An air needle is fixed at the center of the top of the upper sliding cylinder. The outer wall of the connecting cylinder is slidably installed in the inner wall of the upper sliding cylinder. Both ends of the first guide rod are fixed on the inner wall of the hollow groove. The fixing ring is located directly above the first spring. The second spring is located between the hollow plate and the moving ring.

[0008] As a preferred embodiment of the hot gas welding equipment for automotive plastic parts of the present invention, a guide seat is installed in the middle of the two side walls of the heating mold, an internal groove is provided at the center of the bottom of the mounting groove, connecting pipes are evenly spaced at the bottom of the internal groove, and a heating pipe is provided at the center of the interior of the heating mold.

[0009] As a preferred embodiment of the hot gas welding equipment for automotive plastic parts of the present invention, nitrogen pipes are provided at the upper and lower parts of the heating mold, and an upper pressure plate and a lower top plate are provided at the upper and lower parts of the machine body, respectively. A first electric push rod is installed at each of the four corners of the top of the upper pressure plate, and a rotating groove is opened at both ends of the upper surface of the upper pressure plate and the lower top plate.

[0010] As a preferred embodiment of the hot gas welding equipment for automotive plastic parts of the present invention, a top seat is installed at the bottom center of the lower top plate, and the bottom of the top seat is provided with evenly spaced insertion holes. The front ends of the upper pressure plate and the lower top plate are movably connected to the rotating frame through hinges, and a fixed mold is installed on one side wall of the rotating frame.

[0011] As a preferred embodiment of the hot gas welding equipment for automotive plastic parts of the present invention, the following features are provided: docking seats are installed at both the front and rear ends of the bottom of the lower top plate; second electric push rods are installed at both the front and rear ends below the lower top plate; lifting plates are installed at the telescopic ends of the second electric push rods; and insertion posts are fixedly provided at even intervals along the horizontal direction on the top of the lifting plates; wherein the top end of the docking pipe is slidably inserted into the interior of the lower cylinder; the top end of the first electric push rod is installed on the inner wall of the machine body; and the insertion posts are correspondingly inserted into the insertion holes.

[0012] The beneficial effects of this invention are as follows: by using a single heating component, the positions of the air needle, the lower sliding cylinder, and the upper sliding cylinder are adjusted under the elastic action of the first and second springs, and air passage is achieved. Therefore, the number of air needles can be adjusted according to the contact area of ​​the welding surface of the plastic part, and can also be adjusted according to the shape and flatness of the welding surface of the automotive plastic part. It has a wide range of applications. At the same time, it will not cause waste due to excessive discharge of high-temperature nitrogen, nor will it affect the heat melting effect due to insufficient discharge.

[0013] Given that existing hot gas welding equipment requires manual disassembly and replacement of molds by workers due to the upper and lower molds being located inside the machine body, which is inconvenient for workers, affects efficiency, and poses safety hazards, a further improvement to the hot gas welding equipment for automotive plastic parts is proposed.

[0014] As a preferred embodiment of the hot gas welding equipment for automotive plastic parts of the present invention, it further includes an adjustment component disposed inside the rotating groove. The adjustment component includes a rotating block disposed inside the rotating groove and a third electric push rod installed inside the rotating block. A rotating shaft is fixed at the center of both side walls of the rotating block.

[0015] In a preferred embodiment of the hot gas welding equipment for automotive plastic parts of the present invention, the telescopic end of the third electric push rod is connected to the connecting plate via a hinge; one end of the rotating shaft is rotatably mounted in a bearing on the wall of the rotating groove, and one side wall of the connecting plate is fixed to the outer wall of the rotating frame.

[0016] Another beneficial effect of the present invention is that by setting the adjustment component, the rotating frame can be driven to rotate under the action of the third electric push rod, so that the fixed mold on the surface of the rotating frame faces the worker, thereby making it easier for the worker to quickly change the fixed mold suitable for the corresponding size and shape of automotive plastic parts, without the need for manual disassembly and assembly inside the machine body, improving the convenience of the worker's operation, increasing efficiency, reducing safety hazards, and at the same time, making it easier for the worker to pick up materials and improving the material unloading efficiency.

[0017] Given that existing hot gas welding equipment requires equipment downtime after welding plastic parts due to the cooling time required, thus affecting the welding efficiency, a further improvement to the hot gas welding equipment for automotive plastic parts is proposed.

[0018] As a preferred embodiment of the hot gas welding equipment for automotive plastic parts of the present invention, it further includes a drive rail disposed directly below the docking seat, a drive seat being slidably mounted on the surface of the drive rail, and the two ends of the drive rail being respectively fixed to the inner walls of adjacent cooling boxes.

[0019] As a preferred embodiment of the hot gas welding equipment for automotive plastic parts of the present invention, it further includes a cooling device installed at the center of the top of the cooling box.

[0020] Another beneficial effect of the present invention is that by setting up a drive track and a cooling device, the positions of the two sets of lower top plates and rotating frames can be adjusted synchronously. Therefore, when welding automotive plastic parts, the previous automotive plastic part can be cooled down at the same time, realizing continuous welding operations of automotive plastic parts, shortening machine downtime, and improving efficiency.

[0021] In addition, the present invention also provides the following technical solution: a welding method for a hot gas welding equipment for automotive plastic parts, wherein the hot gas welding equipment for automotive plastic parts welds automotive plastic parts according to the following steps;

[0022] S1: First, use the third electric push rod to push and adjust the angle of the rotating frame so that the fixed mold is placed vertically. Then, the staff disassembles and replaces the appropriate fixed mold.

[0023] S2: Next, use a fixed mold to fix the two automotive plastic parts onto the rotating frame on the surface of the upper pressure plate and the lower top plate;

[0024] S3: Then, move the position of the heating middle mold between the upper pressure plate and the lower top plate, and then bring the upper and lower automotive plastic parts welding surfaces into contact with the air needles to allow the heated nitrogen gas to be discharged and heat melt the automotive plastic parts welding surfaces.

[0025] S4: After the upper and lower automotive plastic parts are hot-melted and joined together, the upper and lower automotive plastic parts are welded, and the welding operation of the automotive plastic parts is completed. After the overall automotive plastic parts are welded, the positions of the two sets of lower top plates are adjusted by using the drive rail and drive seat to move and adjust.

[0026] S5: At this time, a set of lower top plates containing welded automotive plastic parts will move to the cooling box and be cooled down by the cooling equipment, while another set of empty lower top plates will move to the machine body for welding operations, thus realizing continuous welding operations of automotive plastic parts. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0028] Figure 1 This is a schematic diagram of the overall structure of the hot gas welding equipment for automotive plastic parts in this invention.

[0029] Figure 2 This is a vertical sectional view of the hot gas welding equipment for automotive plastic parts in this invention.

[0030] Figure 3 For the present invention Figure 2 A schematic diagram showing the disassembly of the heating mold in the structure.

[0031] Figure 4 For the present invention Figure 2 Vertical sectional view of the heating mold in the structure.

[0032] Figure 5 For the present invention Figure 4 Vertical sectional view of a single-outlet heating component in the structure.

[0033] Figure 6 For the present invention Figure 5 A disassembly diagram of a single-outlet heating component in the structure.

[0034] Figure 7 For the present invention Figure 2 A schematic diagram of the upper pressure plate in the structure.

[0035] Figure 8 For the present invention Figure 2 A schematic diagram of the structure of the lower pressure plate and the drive track.

[0036] Figure 9 For the present invention Figure 8 A schematic diagram of the lower pressure plate in the structure.

[0037] Figure 10 For the present invention Figure 8 A schematic diagram of the second electric actuator in the structure.

[0038] Figure 11 For the present invention Figure 9 A schematic diagram of the regulating component in the structure.

[0039] The attached diagram lists the components represented by each number as follows:

[0040] 100. Machine body; 101. Heated intermediate mold; 101a. Guide seat; 101b. Mounting slot; 101c. Internal slot; 101d. Connecting pipe; 101e. Heating pipe; 102. Nitrogen pipe; 103. Needle plate; 103a. Hollow slot; 104. Upper pressure plate; 104a. First electric push rod; 104b. Rotating groove; 105. Lower top plate; 105a. Top seat; 105b. Insertion hole; 106. Rotating frame; 106a. Fixed mold; 107. Connecting seat; 108. Second electric push rod; 108a. Lifting plate; 108b. Insertion column; 200. Cooling box; 300. Single-outlet heating assembly; 301. Lower slide cylinder; 301a. Connecting cylinder; 302. Upper slide cylinder; 302a. Air needle; 303. Fixing ring; 304. First guide rod; 304a. First spring; 305. Hollow plate; 306. Sealing plug plate; 307. Second guide rod; 307a. Second spring; 308. Moving ring; 400. Adjusting assembly; 401. Rotating block; 401a. Rotating shaft; 402. Third electric push rod; 403. Connecting plate; 500. Drive rail; 501. Drive seat; 600. Cooling equipment. Detailed Implementation

[0041] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0042] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0043] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0044] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0045] Example 1, referring to Figure 1 , Figure 2 , Figure 3 and Figure 5 This is the first embodiment of the present invention. This embodiment provides a hot gas welding device for automotive plastic parts. The hot gas welding device for automotive plastic parts realizes the adaptive adjustment of the number of air needles 302a through the elastic action of the first spring 304a and the second spring 307a, and makes adaptive adjustments according to the shape, flatness and other properties of the welding surface of the automotive plastic parts.

[0046] Specifically, the machine body 100 has a heating intermediate mold 101 slidably mounted at the center of its interior. The heating intermediate mold 101 has mounting grooves 101b at the center of its upper and lower surfaces. A needle plate 103 is mounted inside the mounting groove 101b by screws. Hollow grooves 103a are arrayed inside the needle plate 103. A cooling box 200 is fixed to the bottom of the two side walls of the machine body 100. A single-exit heating assembly 300 includes a sliding cylinder 301 slidably mounted in the inner wall of the hollow groove 103a and an upper sliding cylinder 302 located directly above the sliding cylinder 301. A docking cylinder 301a is fixed at the center of the top of the sliding cylinder 301.

[0047] For details, please refer to Figure 5 and Figure 6 A fixing ring 303 is fixedly installed on the upper part of the outer wall of the connecting cylinder 301a. A first guide rod 304 is slidably sleeved in the sliding holes around the fixing ring 303. A first spring 304a is sleeved on the outer wall of the first guide rod 304. A hollow plate 305 is fixedly installed in the middle of the inner wall of the upper sliding cylinder 302. A sealing plug plate 306 is installed in the air port on the hollow plate 305. A second guide rod 307 is fixedly installed at each of the four corners at the bottom of the sealing plug plate 306. The other end of the second guide rod 307 passes through the hollow plate 305. The upper sliding hole is connected to the moving ring 308, and the outer wall of the second guide rod 307 is fitted with a second spring 307a; wherein, the top center position of the upper sliding cylinder 302 is fixedly provided with an air needle 302a, the outer wall of the docking cylinder 301a is slidably installed in the inner wall of the upper sliding cylinder 302, the two ends of the first guide rod 304 are fixed on the inner wall of the hollow groove 103a, the fixing ring 303 is located directly above the first spring 304a, and the second spring 307a is located between the hollow plate 305 and the moving ring 308;

[0048] In use, when welding automotive plastic parts, the two parts to be welded are placed sequentially on the upper pressure plate 104 and the lower top plate 105, and clamped and limited by the fixed mold 106a. After the parts are fixed, the heating middle mold 101 is moved by the drive device. Under the action of the guide seat 101a, the heating middle mold 101 moves forward and is positioned between the upper pressure plate 104 and the lower top plate 105. Then, the first electric push rod 104a and the second electric push rod 108 are activated. The telescopic end of the first electric push rod 104a extends and pushes the upper pressure plate 104 downward, causing the bottom of the upper pressure plate 104 to rotate. The automotive plastic parts fixed on the rotating frame 106 move downwards synchronously. The telescopic end of the second electric push rod 108 extends and pushes the lifting plate 108a upwards. As the lifting plate 108a rises, the insert 108b at its top inserts into the insertion hole 105b on the base of the lower top plate 105, causing the automotive plastic parts fixed on the rotating frame 106 at the top of the lower top plate 105 to move upwards synchronously. The welding surfaces of the upper and lower automotive plastic parts come into contact with the adjacent air needles 302a. As the upper pressure plate 104 and the lower top plate 105 continue to apply force, the welding surfaces of the upper and lower automotive plastic parts continuously squeeze the corresponding contacting air needles 302a, and the air needles 302a in contact with the welding surfaces are subjected to force. This will push the upper sliding cylinder 302 towards the lower sliding cylinder 301. During this process, the docking cylinder 301a moves relative to the lower cylinder and squeezes the moving ring 308. The moving ring 308, under the force of the second guide rod 307, pushes the sealing plug plate 306 and squeezes the second spring 307a. At this time, the sealing plug plate 306 can open the air port on the hollow plate 305, so that the air passages inside the lower sliding cylinder 301 and the upper sliding cylinder 302 are opened. When dealing with uneven welding surfaces, the air needle 302a is continuously stressed. Therefore, after the upper sliding cylinder 302 presses against the lower sliding cylinder 301, the lower sliding cylinder 301 is continuously stressed by the fixed ring 303 and the first guide rod 307a. The rod 304 moves under the action of the rod and squeezes the first spring 304a, so that the air passages in contact with each part of the uneven welding surface can be opened. Then, the heating tube 101e is used to heat the nitrogen gas delivered in the nitrogen tube 102, and the high-temperature nitrogen gas can be used to heat melt the welding surface of the adjacent automotive plastic parts. Therefore, the single-outlet heating component 300 can adaptively adjust the number of air needles 302a according to the contact area of ​​the welding surface of the plastic parts, and make adaptive adjustments according to the shape and flatness of the welding surface of the automotive plastic parts. It has a wide range of applications. At the same time, it will not cause waste due to excessive discharge of high-temperature nitrogen, or affect the heat melting effect due to insufficient discharge.

[0049] Further, the cross-section of the hollow groove 103a is in the shape of the Chinese character 'zhong'. A heat-insulating curtain is provided between the body 100 and the cooling box 200 to reduce the mixing amount of the hot air in the body 100 and the cold air in the cooling box 200, thereby reducing energy loss. The upper sliding cylinder 302 and the lower sliding cylinder 301 are slidably connected and limited by a docking cylinder 301a. The first guide rod 304 plays a role in limiting and assisting the sliding of the fixing ring 303 and the first spring 304a. The cross-section of the sealing plug plate 306 is in the shape of a T, and its bottom can be disassembled and inserted into the air port on the hollow plate 305. The second guide rod 307 plays a role in limiting and assisting the sliding of the second spring 307a.

[0050] For details, see Figure 2 、 Figure 3 、 Figure 4 、 Figure 7 、 Figure 8 、 Figure 9 and Figure 10 As shown in

[0051] 、 Figure 9 and Figure 10 shown, on the middle parts of the two side walls of the heating middle mold 101, guide seats 101a are installed. At the center position of the bottom of the installation groove 101b, an internal groove 101c is provided. At the bottom of the internal groove 101c, docking pipes 101d are evenly spaced. At the center position inside the heating middle mold 101, a heating pipe 101e is provided; nitrogen pipes 102 are provided above and below the inside of the heating middle mold 101. Above and below the inside of the body 100, an upper pressing plate 104 and a lower top plate 105 are respectively provided. At the four corners of the top of the upper pressing plate 104, first electric push rods 104a are installed. At both ends of the upper surfaces of the upper pressing plate 104 and the lower top plate 105, rotating grooves 104b are provided; at the center position of the bottom of the lower top plate 105, a top seat 105a is installed. At the bottom of the top seat 105a, insertion holes 105b are evenly spaced. At the front parts of the opposite end faces of the upper pressing plate 104 and the lower top plate 105, they are respectively movably connected to a rotating frame 106 through hinges. On one side wall of the rotating frame 106, a fixed mold 106a is installed; at the front and rear ends of the bottom of the lower top plate 105, docking seats 107 are installed. At the front and rear ends below the lower top plate 105, second electric push rods 108 are installed. The telescopic ends of the second electric push rods 108 are provided with lifting plates 108a. Along the horizontal direction on the top of the lifting plates 108a, insertion columns 108b are fixedly provided at equal intervals; among them, the top ends of the docking pipes 101d are slidably inserted into the inside of the lower sliding cylinder 301. The top ends of the first electric push rods 104a are installed on the inner wall of the body 100. The insertion columns 108b and the insertion holesIn use, the above-mentioned setup uses the first electric push rod 104a and the second electric push rod 108 to raise and lower the positions of the upper pressure plate 104 and the lower top plate 105. After the welding surfaces of the upper and lower automotive plastic parts are heat-melted, the heating middle mold 101 is withdrawn, and then the upper pressure plate 104 and the lower top plate 105 are moved towards the center to align the heat-melted parts of the welding surfaces of the upper and lower automotive plastic parts. After standing for a period of time, the welding operation of the upper and lower automotive plastic parts can be completed. Then, the upper pressure plate 104 is removed, and the entire automotive plastic part on the lower top plate 105 is cooled and removed.

[0052] Furthermore, the fixed mold 106a is disassembled and assembled using screws, the heating intermediate mold 101 moves back and forth using a drive device, and the guide seat 101a serves to limit and guide the heating intermediate mold 101. The top of the connecting pipe 101d is slidably inserted into the lower cylinder 301, which enables the disassembly and assembly of the needle plate 103. The heating tube 101e, nitrogen tube 102, fixed mold 106a, etc. are all existing technologies, so they will not be described in detail here.

[0053] Example 2, refer to Figure 9 and Figure 11 This is the second embodiment of the present invention. This embodiment is based on the previous embodiment. The difference is that, in order to facilitate the replacement of the fixed mold 106a, the third electric push rod 402 is used to push the rotating frame 106 to rotate, so that the fixed mold 106a on the rotating frame 106 faces the workers. This makes disassembly and assembly more convenient and improves the subsequent material unloading efficiency.

[0054] Specifically, it also includes an adjustment assembly 400 disposed inside the rotating groove 104b. The adjustment assembly 400 includes a rotating block 401 disposed inside the rotating groove 104b and a third electric push rod 402 installed inside the rotating block 401. A rotating shaft 401a is fixed at the center of both side walls of the rotating block 401. The telescopic end of the third electric push rod 402 is connected to the connecting plate 403 via a hinge. One end of the rotating shaft 401a is rotatably installed in a bearing on the groove wall of the rotating groove 104b, and one side wall of the connecting plate 403 is fixed on the outer wall of the rotating frame 106.

[0055] When the above-mentioned configuration is in use, and it is necessary to clamp and fix automotive plastic parts of different sizes and shapes, the third electric push rod 402 is activated. The telescopic end of the third electric push rod 402 extends and pushes the connecting plate 403 to move. The connecting plate 403 is fixed on the outer wall of the adjacent rotating frame 106, and the front part of the rotating frame 106 is rotatably mounted on the front part of the adjacent upper pressure plate 104 and lower top plate 105 via a hinge. At the same time, the third electric push rod 402 is installed inside the rotating block 401, and the rotating block 401 is rotatably mounted in the rotating groove 104b via the rotating shaft 401a. Therefore, the third electric push rod 402... 02 The extension will push the rotating frame 106 to rotate around the hinge, rotating the rotating frame 106 to a vertical position. Then, the workers can disassemble the fixed mold 106a on the surface of the upper pressure plate 104 and the lower top plate 105 and replace it with a fixed mold 106a suitable for the corresponding size and shape of automotive plastic parts. Therefore, there is no need for manual disassembly and assembly inside the machine body 100, which improves the convenience of workers' operation, increases efficiency, and reduces safety hazards. At the same time, in the subsequent material unloading process, it is only necessary to drive the rotating frame 106 on the lower top plate 105 to rotate, so that workers can pick up materials and improve unloading efficiency.

[0056] Furthermore, when the third electric push rod 402 extends, its end pushes the connecting plate 403 to move. At the same time, in order to ensure that the rotating frame 106 can rotate, the third electric push rod 402 can rotate around the rotating shaft 401a as the axis during the extension process.

[0057] Example 3, referring to Figure 2 and Figure 8 This is the third embodiment of the present invention, which is based on embodiment 1. The difference is that, in order to improve the welding efficiency of automotive plastic parts, the welding and cooling operations of two sets of automotive plastic parts can be realized under the action of the drive rail 500 and the drive seat 501.

[0058] Specifically, it also includes a drive rail 500 located directly below the docking seat 107, a drive seat 501 slidably mounted on the surface of the drive rail 500, and both ends of the drive rail 500 fixed to the inner wall of the adjacent cooling box 200; it also includes a cooling device 600 installed at the center of the top of the cooling box 200.

[0059] In use, after the upper and lower automotive plastic parts are hot-melt welded, the entire automotive plastic part is positioned on the lower top plate 105. Then, the second electric push rod 108 is activated, continuously lowering the height of the lower top plate 105. As the lower top plate 105 descends, the insertion post 108b separates from the insertion hole 105b. Simultaneously, the mating seat 107 at the bottom of the lower top plate 105 is inserted into the top of the drive seat 501. Then, under the action of the drive device, the drive seat 501 and the lower top plate 105 in the middle, as well as the drive seat 501 and the lower top plate 105 located in the cooling box 200 on one side, move along the drive track 5. At this point, the drive seat 501 and the lower top plate 105 (containing the welded integral automotive plastic parts) located in the middle will move to the cooling box 200 on the other side, and the cooling equipment 600 will cool down the integral automotive plastic parts. The drive seat 501 and the lower top plate 105, which were originally located in the cooling box 200, will now be placed in the machine body 100, and subsequent automotive plastic parts welding operations will be carried out. Therefore, when welding automotive plastic parts, the previous automotive plastic parts can be cooled down at the same time, realizing continuous welding operations of automotive plastic parts, shortening machine downtime, and improving efficiency.

[0060] Furthermore, the docking seat 107 can be slidably inserted into the top of the drive seat 501, and under the action of the drive rail 500 and the drive device, the two sets of lower top plates 105 can be slidably moved. The cooling device 600 is a refrigeration device such as a refrigerator. A refrigerator is a machine that transfers the heat of a cooled object with a lower temperature to the ambient medium to obtain cooling capacity. The heat transferred from a lower temperature object is conventionally called cooling capacity. Its types include: compression refrigerator, absorption refrigerator, steam jet refrigerator, etc. A refrigerator can accelerate the cooling of the welded integral automotive plastic parts and improve the cooling efficiency. This is existing technology and will not be described in detail here.

[0061] Example 4, this is the fourth embodiment of the present invention, which provides a welding method for hot gas welding equipment for automotive plastic parts, specifically including the following steps;

[0062] S1: First, use the third electric push rod 402 to push and adjust the angle of the rotating frame 106 so that the fixed mold 106a is placed vertically. Then, the staff disassembles and replaces the appropriate fixed mold 106a.

[0063] S2: Next, the two automotive plastic parts are fixed on the rotating frame 106 on the surface of the upper pressure plate 104 and the lower top plate 105 using the fixed mold 106a;

[0064] S3: Then, move the position of the heating middle mold 101 between the upper pressure plate 104 and the lower top plate 105, and then bring the upper and lower automotive plastic parts welding surfaces into contact with the air needle 302a, so that the heated nitrogen gas is discharged to heat melt the automotive plastic parts welding surfaces.

[0065] S4: After the upper and lower automotive plastic parts are hot-melted and joined together, the upper and lower automotive plastic parts are welded, and the automotive plastic parts welding operation is completed. After the overall automotive plastic parts are welded, the positions of the two sets of lower top plates 105 are adjusted by using the drive rail 500 and drive seat 501 to translate.

[0066] S5: At this time, a set of lower top plates 105 containing welded automotive plastic parts will move to the cooling box 200 and be cooled by the cooling equipment 600. Another set of empty lower top plates 105 will move to the machine body 100 for welding operations, thus realizing continuous welding operations of automotive plastic parts.

[0067] Additionally, it should be noted that components not described in detail in this article are existing technologies.

[0068] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., variations in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, the use of materials, colors, orientations, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application. For example, an element shown as integrally formed may be composed of multiple parts or elements, the positions of elements may be inverted or otherwise altered, and the nature, number, or position of discrete elements may be changed or modified. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the invention is not limited to the particular embodiments but extends to a variety of modifications that still fall within the scope of the appended claims.

[0069] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the currently considered best mode for carrying out the invention, or those features that are not relevant to implementing the invention) may be omitted.

[0070] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0071] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A hot gas welding equipment for automotive plastic parts, characterized in that: include, The machine body (100) has a heating middle mold (101) that is slidably installed at the center of the machine body (100). The upper and lower surfaces of the heating middle mold (101) are provided with mounting grooves (101b). A needle plate (103) is installed inside the mounting groove (101b) by screws. Hollow grooves (103a) are arrayed inside the needle plate (103). An upper pressure plate (104) and a lower top plate (105) are respectively provided at the upper and lower parts of the machine body (100). Rotary grooves (104b) are provided at both ends of the upper surfaces of the upper pressure plate (104) and the lower top plate (105). Cooling box (200), the cooling box (200) is fixed to the bottom of both side walls of the body (100); A single-outlet heating assembly (300) includes a sliding cylinder (301) slidably installed in the inner wall of the hollow groove (103a) and an upper sliding cylinder (302) disposed directly above the sliding cylinder (301). A docking cylinder (301a) is fixedly provided at the top center of the sliding cylinder (301). A fixing ring (303) is fixedly provided on the upper part of the outer wall of the docking cylinder (301a). A first guide rod (304) is slidably sleeved in the sliding holes around the fixing ring (303). The outer wall of the first guide rod (304) is sleeved with... A first spring (304a) is provided. A hollow plate (305) is fixedly provided in the middle of the inner wall of the upper sliding cylinder (302). A sealing plug plate (306) is installed in the air port on the hollow plate (305). A second guide rod (307) is fixedly provided at each of the four corners at the bottom of the sealing plug plate (306). The other end of the second guide rod (307) passes through the sliding hole on the hollow plate (305) and is connected to the moving ring (308). A second spring (307a) is sleeved on the outer wall of the second guide rod (307). Among them, an air needle (302a) is fixedly provided at the top center of the upper sliding cylinder (302), the outer wall of the docking cylinder (301a) is slidably installed in the inner wall of the upper sliding cylinder (302), the two ends of the first guide rod (304) are fixed on the inner wall of the hollow groove (103a), the fixed ring (303) is located directly above the first spring (304a), and the second spring (307a) is located between the hollow plate (305) and the moving ring (308); The adjustment assembly (400) includes a rotating block (401) disposed inside the rotating groove (104b) and a third electric push rod (402) installed inside the rotating block (401). A rotating shaft (401a) is fixed at the center of both side walls of the rotating block (401). A drive rail (500), on the surface of which a drive seat (501) is slidably mounted, and both ends of the drive rail (500) are respectively fixed to the inner walls of adjacent cooling boxes (200); and, It also includes a cooling device (600) installed at the center of the top of the cooling box (200).

2. The hot gas welding equipment for automotive plastic parts as described in claim 1, characterized in that: Guide seats (101a) are installed in the middle of the two side walls of the heating medium mold (101), an internal groove (101c) is provided at the center of the bottom of the mounting groove (101b), and connecting pipes (101d) are evenly spaced at the bottom of the internal groove (101c). A heating pipe (101e) is provided at the center of the interior of the heating medium mold (101).

3. The hot gas welding equipment for automotive plastic parts as described in claim 2, characterized in that: Nitrogen pipes (102) are provided both above and below the interior of the heating mold (101), and first electric push rods (104a) are installed at the four corners of the top of the upper pressure plate (104).

4. The hot gas welding equipment for automotive plastic parts as described in claim 3, characterized in that: A top seat (105a) is installed at the bottom center of the lower top plate (105). The bottom of the top seat (105a) is provided with evenly spaced insertion holes (105b). The front ends of the upper pressure plate (104) and the lower top plate (105) are movably connected to the rotating frame (106) by hinges. A fixed mold (106a) is installed on one side wall of the rotating frame (106).

5. The hot gas welding equipment for automotive plastic parts as described in claim 4, characterized in that: The bottom front and rear ends of the lower top plate (105) are equipped with docking seats (107), and the bottom front and rear ends of the lower top plate (105) are equipped with second electric push rods (108). The telescopic end of the second electric push rod (108) is equipped with a lifting plate (108a), and the top of the lifting plate (108a) is fixed with inserts (108b) evenly spaced along the horizontal direction. The top end of the connecting tube (101d) is slidably inserted into the lower slide tube (301), the top end of the first electric push rod (104a) is installed on the inner wall of the body (100), and the insertion post (108b) is correspondingly inserted into the insertion hole (105b).

6. The hot gas welding equipment for automotive plastic parts as described in claim 5, characterized in that: The telescopic end of the third electric push rod (402) is connected to the connecting plate (403) via a hinge; One end of the rotating shaft (401a) is rotatably mounted in a bearing on the wall of the rotating groove (104b), and one side wall of the connecting plate (403) is fixed on the outer wall of the rotating frame (106).

7. A welding method for a hot gas welding equipment for automotive plastic parts, characterized in that: The hot gas welding equipment for automotive plastic parts according to any one of claims 4 to 6 performs welding on automotive plastic parts according to the following steps; S1: First, use the third electric push rod (402) to push and adjust the angle of the rotating frame (106) so that the fixed mold (106a) is placed vertically. Then, the staff disassembles and replaces the appropriate fixed mold (106a). S2: Next, the two automotive plastic parts are fixed on the rotating frame (106) on the surface of the upper pressure plate (104) and the lower top plate (105) using the fixed mold (106a); S3: Then, the position of the heating middle mold (101) is moved between the upper pressure plate (104) and the lower top plate (105). Then, the upper and lower automotive plastic parts welding surfaces are brought into contact with the air needle (302a) so that the heated nitrogen gas is discharged to heat melt the automotive plastic parts welding surfaces. S4: After the upper and lower automotive plastic parts are hot-melted and joined together, the upper and lower automotive plastic parts are welded, and the automotive plastic parts welding operation is completed. After the overall automotive plastic parts are welded, the positions of the two sets of lower top plates (105) are adjusted by using the drive rail (500) and drive seat (501). S5: At this time, a set of lower top plates (105) containing welded automotive plastic parts will be moved to the cooling box (200) and cooled down by the cooling equipment (600). Another set of empty lower top plates (105) will be moved to the machine body (100) for welding operations, so as to realize continuous welding operations of automotive plastic parts.

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