High-precision thermoplastic composite welding tool

Abstract

The utility model discloses a high-precision thermoplastic composite material welding tool, and relates to the technical field of welding tools. The electric welding device comprises a U-shaped welding frame, a translation assembly is arranged on the lower side of the inner wall of the U-shaped welding frame, a lifting assembly is arranged on the translation assembly, and an electric welding mechanism is arranged on the lifting assembly; the two sides of the inner wall of the U-shaped welding frame are each provided with a fixing plate and two supporting frames, and each fixing plate is located between the corresponding two supporting frames. Through cooperation of the translation assembly and the lifting assembly, the position of the electric welding mechanism is adjusted in the transverse direction and the vertical direction, the welding position is conveniently and accurately positioned, an electric push rod stretches to push a first movable plate and a second movable plate to rotate, and a rotating rod presses a first lifting plate downwards through an extrusion head; the elastic pressing and fixing piece can elastically press the workpiece on the fixing plate, and the uniformity of the pressing force of the welding tool on the thermoplastic composite material workpiece is improved.

Description

Technical Field

[0001] This utility model belongs to the field of welding tooling, specifically, it relates to a high-precision thermoplastic composite material welding tooling. Background Technology

[0002] Thermoplastic composite welding fixtures are specialized equipment or devices used to assist in the welding process of thermoplastic composites. Their main functions are to accurately position and reliably clamp the workpiece to be welded, and to provide a stable welding operating environment.

[0003] Chinese Patent No. CN215095717U discloses a welding fixture for continuous fiber reinforced thermoplastic composite materials, including: a fixed base, four evenly spaced support columns fixedly welded to the bottom wall of the fixed base, two parallel support plates fixedly connected to the top wall of the fixed base, and a horizontal plate fixedly connected to the opposite side of the two support plates, with a processing groove provided on the horizontal plate.

[0004] The welding fixture for continuous fiber reinforced thermoplastic composite materials disclosed in this application is fixed by turning the threaded rod to make the fixing plate abut against the end surface of the composite material. The operation process is relatively cumbersome and can easily affect the welding efficiency of the composite material. Moreover, the tightening degree of the two threaded rods is often different, which can easily lead to inconsistent clamping force of the two fixing plates on their respective composite materials. This may affect the flatness of the joint between the two composite materials and affect the subsequent welding effect. Furthermore, over-tightening the threaded rod can easily damage the surface of the composite material. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a high-precision thermoplastic composite material welding fixture, which solves the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by this utility model is as follows:

[0007] A high-precision thermoplastic composite welding fixture includes: a U-shaped welding frame, multiple support legs mounted on the lower side of the U-shaped welding frame, a translation component mounted on the lower side of the inner wall of the U-shaped welding frame, a lifting component mounted on the translation component, and an electric welding mechanism mounted on the lifting component.

[0008] Both sides of the inner wall of the U-shaped welding frame are equipped with fixed plates and two support frames. The fixed plates are located between the corresponding two support frames. The support frames are rotatably fitted with an electric push rod, a first movable plate, and a rotating rod. The upper part of the rotating rod is equipped with an extrusion head, and the lower part of the rotating rod is rotatably fitted with a second movable plate. The lower part of the second movable plate and the output shaft of the electric push rod are rotatably connected to the upper part of the first movable plate. There are two first lifting plates that slide elastically between the two sides of the inner wall of the U-shaped welding frame. The first lifting plates are equipped with two elastic clamping members, which are located above the corresponding fixed plates. The extrusion head is located above the corresponding first lifting plate.

[0009] Optionally, the translation component includes a first motor installed on the lower side of the inner wall of the U-shaped welding frame, the output shaft of the first motor being fixedly connected to a screw, a sliding block being slidably fitted on the lower side of the inner wall of the U-shaped welding frame, the sliding block being threadedly fitted on the periphery of the screw, and a lifting component being disposed on the upper part of the sliding block.

[0010] Optionally, a bearing seat is installed on the lower side of the inner wall of the U-shaped welding frame, one end of the screw is rotatably fitted in the bearing seat, and the sliding block is located between the first motor and the bearing seat.

[0011] Optionally, the lifting assembly includes a second lifting plate and a second motor mounted on one side of the sliding block. The output shaft of the second motor is fixedly connected to a first rotating plate. The second rotating plate is rotatably fitted on one side of the second lifting plate. The lower part of the second rotating plate is rotatably connected to the upper part of the first rotating plate. Two fixed rods are mounted on the upper side of the sliding block. The fixed rods penetrate the second lifting plate vertically. A circular plate is provided on the upper end face of the fixed rod. The welding mechanism is mounted on the top of the second lifting plate and is located between the two circular plates.

[0012] Optionally, the welding mechanism includes a welding machine mounted on the second lifting plate, with a welding head fixedly connected to the output end of the welding machine. The welding head is located at the top of the welding machine and between the two fixed plates.

[0013] Optionally, the support frame includes a rectangular plate installed on one side of the inner wall of the U-shaped welding frame. A first support plate, a first U-shaped frame, and two second support plates are installed on the upper side of the rectangular plate. An electric push rod is rotatably engaged with the upper part of the first support plate, the lower part of the first movable plate is rotatably engaged with the first U-shaped frame, and the middle part of the rotating rod is rotatably engaged with the upper part between the two second support plates.

[0014] Optionally, two sliding grooves are provided on both sides of the inner wall of the U-shaped welding frame, and protrusions are provided on both sides of the first lifting plate. The protrusions slide in the corresponding sliding grooves, and a first spring is installed between the protrusions and the lower side of the sliding grooves.

[0015] Optionally, the elastic clamping component includes a housing mounted on the first lifting plate, a limiting plate slidingly fitted inside the housing, a second spring provided between the limiting plate and the upper end face of the inner wall of the housing, a sliding rod provided on the lower end face of the limiting plate, the sliding rod vertically penetrating the first lifting plate, a clamping plate mounted on the lower end face of the sliding rod, and the clamping plate located between the first lifting plate and the fixed plate.

[0016] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art. Of course, any product implementing the present invention does not necessarily need to achieve all of the following advantages at the same time:

[0017] By coordinating the translation and lifting components, the welding mechanism can be adjusted horizontally and vertically to facilitate precise positioning of the welding position. The extension of the electric push rod pushes the first and second movable plates to rotate, causing the rotating rod to press down on the first lifting plate with the extrusion head. This achieves elastic clamping of the workpiece on the fixed plate by the elastic clamping device, improving the uniformity of the clamping force of the welding fixture on the thermoplastic composite workpiece, reducing the probability of misalignment between two thermoplastic composite workpieces, and improving the convenience of fixing and disassembling the thermoplastic composite workpiece, thereby increasing the welding efficiency of the thermoplastic composite workpiece.

[0018] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0019] The accompanying drawings described below are merely some embodiments. Those skilled in the art can obtain other drawings based on these drawings without any creative effort. In the drawings:

[0020] Figure 1 This is a schematic diagram of the three-dimensional structure;

[0021] Figure 2 This is a schematic diagram of the support frame structure;

[0022] Figure 3 A schematic diagram of the translation component, lifting component, and welding mechanism;

[0023] Figure 4 This is a schematic diagram of the elastic compression fitting structure.

[0024] The attached diagram lists the components represented by each number as follows:

[0025] 1. U-shaped welding frame; 2. Support leg; 3. First motor; 4. Screw; 5. Sliding block; 6. Bearing seat; 7. Fixed rod; 8. Second lifting plate; 9. Electric welding machine; 10. Electric welding head; 11. Second rotating plate; 12. Second motor; 13. Fixed plate; 14. First lifting plate; 15. Outer shell; 16. Sliding rod; 17. Second spring; 18. Clamping plate; 19. Rectangular plate; 20. First support plate; 21. First U-shaped frame; 22. Second support plate; 23. Second U-shaped frame; 24. Electric push rod; 25. Second movable plate; 26. First movable plate; 27. Rotating rod; 28. First spring.

[0026] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] In the field of thermoplastic composite welding, efficient and precise workpiece fixation is a key prerequisite for ensuring welding quality. Existing technologies utilize a variety of welding fixtures for such materials, primarily aimed at providing stable support for the workpieces to be welded, ensuring precise alignment of the joints, and maintaining a constant position during the welding process. Based on their fixing principles and structural forms, common fixtures can be broadly categorized into several types, including mechanical clamping, vacuum adsorption, and magnetic fixing.

[0030] Mechanical clamping fixtures are currently the most widely used type. Their core structure typically includes a rigid frame (such as a C-frame, U-frame, or worktable), a support platform (fixed plate) for placing the workpiece, and a clamping mechanism to apply clamping force. The most basic clamping mechanism relies on a simple combination of threaded rods and pressure plates. The operator manually tightens one or more vertically or horizontally arranged threaded rods, driving the pressure plate downwards to clamp the composite workpiece onto the support platform. While this structure is simple, reliable, and inexpensive, it also has significant drawbacks: the manual tightening process is time-consuming and labor-intensive, especially when frequently clamping small or batch workpieces, severely limiting welding efficiency; more importantly, when using two or more threaded rods, it is difficult to ensure that the torque applied by each rod is completely consistent, easily leading to uneven clamping force on different areas of the workpiece. This uneven pressure is extremely harmful when welding thermoplastic composites, potentially causing localized micro-deformation or stress concentration in the workpiece, directly damaging the flatness of the joint between the two buttressing workpieces (i.e., misalignment or warping), thus severely affecting the bonding quality of the weld fusion zone and the final mechanical properties of the weld. In addition, if the operator overtightens the threaded rod in pursuit of "stability", the sharp threads or the edge of the pressure plate can easily leave indentations or even cause internal damage on the relatively soft surface of the composite material, reducing the yield of the finished product.

[0031] To improve efficiency and uniformity, some tooling systems have adopted pneumatic or hydraulic drives to replace manual threading rods. These systems utilize the piston rod of a cylinder or hydraulic cylinder to directly push the pressure plate downwards. Compared to manual threading, the clamping and releasing speeds are significantly increased, improving efficiency to some extent. The drive source (compressed air or hydraulic oil) itself also makes it easier to achieve relatively uniform pressure distribution (e.g., by uniformly setting the pressure through a pressure reducing valve). However, their structure is usually more complex, requiring additional air / hydraulic pumps, pipelines, and control valves, increasing equipment costs and maintenance difficulty. More importantly, for applications requiring multi-point independent control or complex pressure distribution profiles, the design and commissioning of pneumatic / hydraulic systems remain challenging, and the problem of uneven local pressure caused by insufficient rigidity of the pressure plate or initial workpiece unevenness remains unresolved. Furthermore, when large workpieces require multiple drive units to work together, system costs and complexity increase further.

[0032] Vacuum adsorption fixtures offer an alternative approach. They feature densely packed adsorption holes on a support platform or specialized clamp. A vacuum pump draws air in, using atmospheric pressure to firmly adhere the flat composite workpiece to the platform. The significant advantage of this method is its extremely uniform pressure distribution and surface contact, greatly reducing the risk of localized pressure damage to the workpiece surface. This is particularly suitable for thin plates or composite materials requiring high surface finish. However, its limitations are also apparent: First, it requires a very flat and airtight contact surface between the workpiece and the adsorption platform; any warping, curved surfaces, or porous surfaces (such as some fabric-reinforced materials) will lead to air leakage and adsorption failure. Second, the system relies on a continuously operating vacuum pump, raising concerns about energy consumption and noise. Third, vacuum adsorption is unsuitable for special composite materials requiring breathability or for situations requiring clamping the workpiece's edges for specific operations. Finally, both initial vacuum establishment and release require time, which is insufficient for extremely rapid clamping cycles.

[0033] Electromagnetic clamping fixtures use the magnetic force generated by electromagnets to hold workpieces. Their advantages include rapid clamping and releasing (simply by switching power on and off) and ease of automation. However, their fatal weakness lies in their applicability only to ferromagnetic materials (such as metal matrix composites or workpieces with magnetically conductive underlay). Most continuous fiber-reinforced thermoplastic composites (such as carbon fiber / PA and glass fiber / PEEK) are inherently non-magnetic, thus severely limiting the application of electromagnetic clamping in this field.

[0034] The existing tooling is primarily used for welding thermoplastic composite components in aerospace (e.g., aircraft skin, ribs), automotive (structural parts, interior panels), wind power (blade components), and sporting goods (bicycle frames, rackets). These applications typically place high demands on the strength, sealing, and appearance quality of welded joints, posing significant challenges to the precision, efficiency, and reliability of the tooling's fixing mechanisms. Basic tooling structures are usually built around a rigid frame (providing basic support and rigidity), adjustable support / positioning blocks (for initial workpiece centering), a core clamping mechanism (mechanical, pneumatic, vacuum, etc.), and sometimes simple translational or rotational mechanisms (facilitating access to the welding position).

[0035] Despite continuous technological advancements, traditional tooling still faces several common challenges in securing thermoplastic composite workpieces with high precision, high efficiency, and without material damage, particularly in ensuring the flatness of butt joint edges for large areas or long welds: First, precise control of clamping force uniformity is difficult; manual or simple mechanical methods can easily lead to excessive or insufficient local stress. Second, there is a contradiction between automation level and cost / complexity; highly efficient automated tooling (such as complex pneumatic multi-point systems) is often expensive and bulky. Third, balancing rapid assembly / disassembly with reliable clamping is challenging; vacuum adsorption is limited by workpiece surface conditions, and rapid clamping mechanisms may sacrifice uniformity. Fourth, there is insufficient flexibility to adapt to different workpiece shapes and sizes; dedicated tooling has poor versatility, while general-purpose tooling struggles to guarantee high precision. These pain points directly restrict further improvements in the production efficiency and product quality of thermoplastic composite welding processes. Therefore, developing a novel fixing solution that provides uniform and controllable clamping force, is convenient and efficient to operate, protects the material surface, adapts to certain workpiece variations, and facilitates integration into automated welding processes remains a crucial direction for technological development in this field.

[0036] Please see Figure 1-4 As shown, this embodiment provides a high-precision thermoplastic composite welding fixture, including: a U-shaped welding frame 1, a plurality of support legs 2 are installed on the lower side of the U-shaped welding frame 1, a translation component is installed on the lower side of the inner wall of the U-shaped welding frame 1, a lifting component is provided on the translation component, and an electric welding mechanism is provided on the lifting component.

[0037] Both sides of the inner wall of the U-shaped welding frame 1 are equipped with a fixed plate 13 and two support frames. The fixed plate 13 is located between the two corresponding support frames. The support frames are rotatably fitted with an electric push rod 24, a first movable plate 26 and a rotating rod 27. The upper part of the rotating rod 27 is equipped with a pressing head, and the lower part of the rotating rod 27 is rotatably fitted with a second movable plate 25. The lower part of the second movable plate 25 and the output shaft of the electric push rod 24 are rotatably connected to the upper part of the first movable plate 26. There are two first lifting plates 14 that slide elastically between the two sides of the inner wall of the U-shaped welding frame 1. The first lifting plate 14 is equipped with two elastic clamping members. The elastic clamping members are located above the corresponding fixed plate 13, and the pressing head is located above the corresponding first lifting plate 14.

[0038] The upper and lower parts of one side of the second movable plate 25 are respectively provided with a first rod and a second rod. The first rod is equipped with a first bearing on its periphery. The lower part of the rotating rod 27 is installed on the periphery of the first bearing. Two second bearings are installed on the periphery of the second rod. The output shaft of the electric push rod 24 is fixedly connected to a connecting block. The upper part of the first movable plate 26 and the connecting block are respectively installed on the periphery of the corresponding second bearings.

[0039] One application of this embodiment is as follows: First, the thermoplastic composite material workpiece to be welded is placed on the fixed plate 13. Then, the electric push rod 24 is extended, causing it to push the first movable plate 26 and the second movable plate 25 to rotate. The second movable plate 25 pushes the middle part of the rotating rod 27 to rotate around its rotation point on the support frame. At this time, the extrusion head on the rotating rod 27 begins to press down on the first lifting plate 14. As the first lifting plate 14 is pressed down, it will drive the two elastic clamping members to move down synchronously, so that the elastic clamping members press on the workpiece, and the workpiece is firmly pressed on the fixed plate 13 by elasticity. After the workpiece is fixed, the translation component can be operated to move the lifting component and the welding mechanism. After reaching the welding position, the lifting component adjusts the height of the welding mechanism. Finally, the welding mechanism is started to weld the two workpieces together. Similarly, referring to the above operation, the electric push rod 24 is controlled to retract, and the welded workpiece can be disassembled. It should be noted that all electrical equipment involved in this application can be powered by a battery or an external power source.

[0040] By coordinating the translation and lifting components, the welding mechanism can be adjusted horizontally and vertically to facilitate precise positioning of the welding position. The electric push rod 24 extends and pushes the first movable plate 26 and the second movable plate 25 to rotate, so that the rotating rod 27 uses the extrusion head to press down on the first lifting plate 14, so that the elastic clamping device can elastically press the workpiece on the fixed plate 13, improve the uniformity of the pressure of the welding fixture on the thermoplastic composite workpiece, reduce the probability of misalignment between two thermoplastic composite workpieces, and improve the convenience of fixing and disassembling thermoplastic composite workpieces, thereby improving the welding efficiency of thermoplastic composite workpieces.

[0041] like Figure 1 , 3 As shown, the translation component of this embodiment includes a first motor 3 installed on the lower side of the inner wall of the U-shaped welding frame 1. The output shaft of the first motor 3 is fixedly connected to a screw 4. A sliding block 5 is slidably fitted on the lower side of the inner wall of the U-shaped welding frame 1. The sliding block 5 is threadedly fitted on the periphery of the screw 4. A lifting component is set on the upper part of the sliding block 5. The first motor 3 drives the screw 4 to move the sliding block 5 linearly, which facilitates the adjustment of the horizontal position of the lifting component and the welding mechanism.

[0042] like Figure 3 As shown, in this embodiment, a bearing seat 6 is installed on the lower side of the inner wall of the U-shaped welding frame 1. One end of the screw 4 is rotatably fitted in the bearing seat 6. The sliding block 5 is located between the first motor 3 and the bearing seat 6. The bearing seat 6 supports the end of the screw 4, improving the stability of the screw 4 rotation and reducing the probability of the screw 4 being deformed by force.

[0043] like Figure 3As shown, the lifting assembly of this embodiment includes a second lifting plate 8 and a second motor 12 mounted on one side of the sliding block 5. The output shaft of the second motor 12 is fixedly connected to a first rotating plate. A second rotating plate 11 is rotatably fitted on one side of the second lifting plate 8. The lower part of the second rotating plate 11 is rotatably connected to the upper part of the first rotating plate. Two fixed rods 7 are mounted on the upper side of the sliding block 5. The fixed rods 7 vertically penetrate the second lifting plate 8. A circular plate is provided on the upper end face of the fixed rods 7. The welding mechanism is mounted on the top of the second lifting plate 8 and is located between the two circular plates. A third rod and a fourth rod are mounted on one side of the second rotating plate 11. The fourth rod is located above the third rod. A third bearing is mounted on the periphery of the third rod. The upper part of the first rotating plate is mounted on the periphery of the third bearing. A fourth bearing is mounted on the periphery of the fourth rod. The fourth bearing is embedded in one side of the second lifting plate 8. The second motor 12 drives the first rotating plate to rotate, so that the second lifting plate 8 can slide up and down along the fixed rods 7 by pushing and pulling the second rotating plate 11, thereby facilitating the adjustment of the position and height of the welding mechanism.

[0044] like Figure 3 As shown, the welding mechanism in this embodiment includes a welding machine 9 mounted on the second lifting plate 8. A welding head 10 is fixedly connected to the output end of the welding machine 9. The welding head 10 is located on the top of the welding machine 9 and between two fixed plates 13. The welding machine 9 facilitates the control of the welding head 10 to weld the joint of the two workpieces.

[0045] like Figure 2 As shown, the support frame in this embodiment includes a rectangular plate 19 installed on one side of the inner wall of the U-shaped welding frame 1. A first support plate 20, a first U-shaped frame 21, and two second support plates 22 are installed on the upper side of the rectangular plate 19. An electric push rod 24 is rotatably fitted on the upper part of the first support plate 20. The lower part of the first movable plate 26 is rotatably fitted inside the first U-shaped frame 21. The middle part of the rotating rod 27 is rotatably fitted on the upper part between the two second support plates 22. One end of the electric push rod 24 is fitted with a second U-shaped frame 23. A first shaft is installed between the two sides of the inner wall of the second U-shaped frame 23. The upper part of the first support plate 20 is sleeved around the periphery of the first shaft. A second support plate 22 is installed between the two sides of the inner wall of the first U-shaped frame 21. The two-axis rod has a first movable plate 26 fitted around the lower part of the second axis rod, and a third axis rod installed between the upper parts of the two second support plates 22. The middle part of the rotating rod 27 is fitted around the third axis rod. The first support plate 20, the first axis rod, and the second U-shaped frame 23 cooperate to support the electric push rod 24 and allow the electric push rod 24 to adaptively adjust its rotation according to the extension length. The first U-shaped frame 21 and the second axis rod cooperate to improve the stability of the rotation of the first movable plate 26. The middle part of the rotating rod 27 is supported by the second support plate 22 and the third axis rod. The lever principle is used to make one end of the rotating rod 27 rotate and rise, and the other end rotate and fall.

[0046] like Figure 2 As shown, the inner wall of the U-shaped welding frame 1 in this embodiment is provided with two sliding grooves on both sides, and the first lifting plate 14 is provided with protrusions on both sides. The protrusions slide in the corresponding sliding grooves, and a first spring 28 is installed between the protrusions and the lower side of the sliding grooves. By cooperating with the sliding grooves, the stability of the first lifting plate 14 when sliding up and down is improved. At the same time, in cooperation with the first spring 28, it is convenient to move the elastic clamping device to the top of the fixed plate 13 when the first lifting plate 14 is reset, thereby facilitating the subsequent placement of workpieces.

[0047] like Figure 1 , 2 As shown in Figure 4, the elastic clamping device of this embodiment includes a housing 15 mounted on the first lifting plate 14. A limiting plate is slidably fitted inside the housing 15. A second spring 17 is provided between the limiting plate and the upper end face of the inner wall of the housing 15. A sliding rod 16 is provided on the lower end face of the limiting plate. The sliding rod 16 vertically penetrates the first lifting plate 14. A clamping plate 18 is installed on the lower end face of the sliding rod 16. The clamping plate 18 is located between the first lifting plate 14 and the fixed plate 13. By cooperating with the housing 15, the probability of the limiting plate detaching from the housing 15 is reduced. The contact area between the sliding rod 16 and the workpiece is increased by the clamping plate 18.

[0048] This utility model is not limited to the above-described embodiments. Anyone should know that structural changes made under the guidance of this utility model, and any technical solutions that are the same as or similar to this utility model, fall within the protection scope of this utility model. Technical aspects, shapes, and structures not described in detail in this utility model are all publicly known technologies.

Claims

1. A high-precision welding fixture for thermoplastic composite materials, characterized in that, include: U-shaped welding frame (1), the lower side of the inner wall of the U-shaped welding frame (1) is equipped with a translation component, a lifting component is provided on the translation component, and an electric welding mechanism is provided on the lifting component; The inner walls of the U-shaped welding frame (1) are equipped with fixed plates (13) and two support frames on both sides. The fixed plates (13) are located between the corresponding two support frames. The support frames are rotatably fitted with electric push rods (24), first movable plates (26) and rotating rods (27). The upper part of the rotating rods (27) is equipped with extrusion heads. The lower part of the rotating rods (27) is rotatably fitted with second movable plates (25). The lower part of the second movable plates (25) and the output shaft of the electric push rods (24) are rotatably connected to the upper part of the first movable plates (26). There are two first lifting plates (14) that slide elastically between the inner walls of the U-shaped welding frame (1). The first lifting plates (14) are equipped with two elastic clamping parts. The extrusion heads are located above the corresponding first lifting plates (14).

2. The high-precision thermoplastic composite material welding fixture according to claim 1, characterized in that, The translation component includes a first motor (3) installed on the lower side of the inner wall of the U-shaped welding frame (1), the output shaft of the first motor (3) is fixedly connected to a screw (4), a sliding block (5) is slidably fitted on the lower side of the inner wall of the U-shaped welding frame (1), the sliding block (5) is threadedly fitted on the periphery of the screw (4), and the lifting component is set on the upper part of the sliding block (5).

3. The high-precision thermoplastic composite material welding fixture according to claim 2, characterized in that, The lower inner wall of the U-shaped welding frame (1) is equipped with a bearing seat (6), and one end of the screw (4) is rotatably fitted in the bearing seat (6).

4. The high-precision thermoplastic composite material welding fixture according to claim 2, characterized in that, The lifting assembly includes a second lifting plate (8) and a second motor (12) mounted on one side of the sliding block (5). The output shaft of the second motor (12) is fixedly connected to a first rotating plate. A second rotating plate (11) is rotatably fitted on one side of the second lifting plate (8). The lower part of the second rotating plate (11) is rotatably connected to the upper part of the first rotating plate. Two fixing rods (7) are mounted on the upper side of the sliding block (5). The fixing rods (7) vertically penetrate the second lifting plate (8). The welding mechanism is mounted on the top of the second lifting plate (8).

5. The high-precision thermoplastic composite material welding fixture according to claim 4, characterized in that, The welding mechanism includes a welding machine (9) mounted on the second lifting plate (8), and a welding head (10) is fixedly connected to the output end of the welding machine (9).

6. The high-precision thermoplastic composite material welding fixture according to claim 1, characterized in that, The support frame includes a rectangular plate (19) installed on one side of the inner wall of the U-shaped welding frame (1). The upper side of the rectangular plate (19) is equipped with a first support plate (20), a first U-shaped frame (21) and two second support plates (22). An electric push rod (24) is rotatably fitted on the upper part of the first support plate (20). The lower part of the first movable plate (26) is rotatably fitted inside the first U-shaped frame (21). The middle part of the rotating rod (27) is rotatably fitted on the upper part between the two second support plates (22).

7. The high-precision thermoplastic composite material welding fixture according to claim 1, characterized in that, The U-shaped welding frame (1) has two sliding grooves on both sides of its inner wall. The first lifting plate (14) has protrusions on both sides. The protrusions slide in the corresponding sliding grooves. A first spring (28) is installed between the protrusions and the lower side of the sliding groove.

8. The high-precision thermoplastic composite material welding fixture according to claim 1, characterized in that, The elastic clamping device includes a housing (15) mounted on the first lifting plate (14), a limiting plate slidingly fitted inside the housing (15), a second spring (17) between the limiting plate and the upper end face of the inner wall of the housing (15), a sliding rod (16) provided on the lower end face of the limiting plate, the sliding rod (16) vertically penetrating the first lifting plate (14), and a clamping plate (18) mounted on the lower end face of the sliding rod (16).

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