Laser transmission welding clamp for plastic unequal-diameter rotary body

Abstract

The laser transmission welding clamp comprises a base, a rotating mechanism, a plurality of radial clamping mechanisms and an axial clamping mechanism, a workpiece is arranged in the middle of the upper surface of the base, the rotating mechanism is installed below the base, the radial clamping mechanisms are circumferentially and evenly distributed, and the axial clamping mechanism is installed below the base. The radial clamping mechanism comprises a pushing mechanism and a temperature-resistant sponge, the pushing mechanism is installed on the upper surface of the base, and the temperature-resistant sponge is connected to the output end of the pushing mechanism and used for making contact with the outer surface of the workpiece in an attached mode and deforming along with the shape of the workpiece to achieve radial clamping of the workpiece; the axial clamping mechanism is located above the workpiece and used for achieving axial clamping of the workpiece. The problems that an existing clamp is poor in adaptability to any rotary special-shaped surface part, and clamping force distribution is uneven can be solved.

Description

Technical Field

[0001] This invention relates to the field of workpiece clamping technology, and more particularly to a laser transmission welding clamp for a plastic unequal diameter rotating body. Background Technology

[0002] Traditional plastic joining technologies (such as infrared welding, hot plate welding, ultrasonic welding, friction welding, and adhesive / solvent bonding) generally face technical bottlenecks when dealing with plastic rotating structural components, including high energy consumption, long cycle times, difficulty in controlling flash, material thermal degradation, and insufficient environmental friendliness. In contrast, laser transmission welding technology stands out due to its non-contact processing characteristics, excellent automation adaptability, programmable complex trajectories, and broad material compatibility. Welded joints produced by this technology feature high production efficiency, strong connection reliability, and excellent sealing performance, making it a significant application value in aerospace, defense, energy and chemical industries, and automotive manufacturing, and has now become the preferred solution for welding and forming plastic rotating products.

[0003] When using laser transmission welding technology to process plastic rotating products of unequal diameter (such as stepped tubes and tapered tubes), the following three main problems are encountered: First, the grippers of existing fixtures are mostly rigid surfaces, and the clamping contact surface cannot perfectly fit the surface of the component, which easily leads to uneven distribution of clamping force. It is difficult to ensure the stability of the tooling, which in turn can cause roundness deviations or uneven force on the clamping system, potentially causing abnormal weld gaps (the technical specification requires a gap value of <0.1mm). Such defects will directly affect the laser energy absorption efficiency and joint sealing performance. Second, different tooling fixtures are required for products of different sizes and specifications, which significantly increases manufacturing costs and reduces production efficiency. Third, given the high energy density and micron-level focusing characteristics of the laser beam, it places extremely stringent technical requirements on the positioning accuracy and stability of the tooling fixtures.

[0004] In summary, developing a flexible welding fixture for unequal-diameter plastic rotating bodies has broad prospects for industrial application and practical significance. It can provide the industry with a high-quality and high-efficiency solution for the poor laser welding quality of unequal-diameter plastic rotating body products. Summary of the Invention

[0005] To address the aforementioned technical problems, a laser transmission welding fixture for plastic unequal-diameter rotating bodies is provided. This invention primarily utilizes the heat-resistant sponge of the radial clamping mechanism to effectively adhere to the surface of irregularly shaped workpieces, transmitting uniform clamping force. Furthermore, multiple sets of radial clamping mechanisms are provided, evenly distributed circumferentially, enabling uniform clamping of the workpiece at multiple positions along its circumference.

[0006] The technical means employed in this invention are as follows: A laser transmission welding fixture for a plastic unequal-diameter rotating body includes: a base, a rotating mechanism, multiple sets of radial clamping mechanisms, and an axial clamping mechanism. The workpiece is placed in the middle of the upper surface of the base. The rotating mechanism is installed below the base. The multiple sets of radial clamping mechanisms are evenly distributed circumferentially. Each radial clamping mechanism includes a pushing mechanism and a heat-resistant sponge. The pushing mechanism is installed on the upper surface of the base. The heat-resistant sponge is connected to the output end of the pushing mechanism and is used to make contact with the outer surface of the workpiece and deform according to the shape of the workpiece to achieve radial clamping of the workpiece. The axial clamping mechanism is located above the workpiece and is used to achieve axial clamping of the workpiece.

[0007] Furthermore, the radial clamping mechanism includes a double cylinder, a guide rail, a slider, and a top block. The double cylinder and the guide rail are both mounted on the base. The output end of the double cylinder is connected to the top block. The top block is connected to the slider. The slider is slidably connected to the guide rail. The front end of the top block is connected to the heat-resistant sponge through a connecting structure.

[0008] Furthermore, the connection structure includes a ball joint and a sponge pad. The ball joint is installed at the front end of the top block to achieve angular rotation within a certain range. The sponge pad is connected to the ball joint, and the heat-resistant sponge is connected to the sponge pad.

[0009] Furthermore, the front end of the top block is provided with an inclined surface, and a threaded hole is provided on the inclined surface. The ball joint is installed on the inclined surface by bolts and the threaded hole.

[0010] Furthermore, the heat-resistant sponge is an open-cell sponge, and is bonded to the sponge pad with a room-temperature curing adhesive.

[0011] Furthermore, a cylinder positioning block is installed on the base, and the double cylinder is installed on the cylinder positioning block.

[0012] Furthermore, the base is provided with a positioning groove, and the cylinder positioning block and the guide rail are both installed in the positioning groove.

[0013] Furthermore, the axial clamping mechanism includes a pressure plate, which is electrically connected to the PLC control unit.

[0014] Furthermore, the rotating mechanism includes a motor and a reducer, the bottom of the base is machined with a keyway, the reducer is connected to the base via a key and the keyway, and the motor is connected to the reducer.

[0015] Compared with the prior art, the present invention has the following advantages: 1. The laser transmission welding fixture for plastic unequal diameter rotating bodies provided by the present invention effectively adheres to the surface of irregular workpieces through the heat-resistant sponge of the radial clamping mechanism, transmitting uniform clamping force. Moreover, the radial clamping mechanism is provided in multiple sets, which are evenly distributed in a circumferential manner, so as to achieve uniform clamping of workpieces at multiple positions in the circumferential direction. This solves the problems of poor adaptability of existing fixtures to parts with arbitrary rotating irregular surfaces and uneven distribution of clamping force.

[0016] 2. The laser transmission welding fixture for plastic unequal diameter rotating bodies provided by the present invention uses a heat-resistant sponge that is bonded to a sponge pad with a room-temperature curing adhesive, which can withstand a certain temperature; and the heat-resistant sponge is an open-cell sponge with low stiffness and high flexibility, so that it can effectively fit the surface of irregular workpieces during the clamping process.

[0017] 3. The laser transmission welding fixture for plastic unequal diameter rotating bodies provided by the present invention has a ball joint of radial clamping mechanism fixed on the inclined surface of the top block, which can realize angular rotation within a certain range and automatically adjust according to the overall slope of the workpiece surface.

[0018] 4. The laser transmission welding fixture for plastic unequal diameter rotating bodies provided by the present invention achieves stable positioning and installation of the double cylinders through the cylinder positioning block; the piston rod of the double cylinder pushes the top block to move forward with the ball joint, and the stability of the movement is ensured by the guide rail slider group.

[0019] 5. The laser transmission welding fixture for plastic unequal diameter rotating bodies provided by the present invention has a pressure plate electrically connected to a PLC control unit. The downward pressure is controlled by the PLC control unit to ensure the axial clamping of the workpiece.

[0020] Based on the above reasons, this invention can be widely applied in fields such as clamping irregularly shaped workpieces. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of a welding fixture for an arbitrarily rotating irregularly shaped workpiece, as described in an example of the present invention.

[0023] Figure 2 This is a top view of a welding fixture for an arbitrarily rotating irregularly shaped workpiece, as described in an example of the present invention.

[0024] In the diagram: 1. Base; 2. Cylinder positioning block; 3. Double cylinder; 4. Guide rail; 5. Slider; 6. Top block; 7. Ball joint; 8. Sponge pad; 9. Heat-resistant sponge; 10. Pressure plate. Detailed Implementation

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0028] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0029] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0030] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0031] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0032] This invention provides a laser transmission welding fixture for plastic unequal diameter rotating bodies. It is a welding fixture for workpieces with arbitrary rotating irregular shapes, which can solve the problems of poor adaptability of existing fixtures to parts with arbitrary rotating irregular surfaces and uneven distribution of clamping force.

[0033] Please see Figure 1 and Figure 2This invention provides a fixture: a welding fixture for workpieces of arbitrary rotational shape, comprising a base 1, a cylinder positioning block 2, a double cylinder 3, a guide rail slider assembly (guide rail 4, slider 5), a top block 6, a ball joint 7, a sponge pad 8, a heat-resistant sponge 9, a pressure plate 10, a reducer, and a motor. After the workpiece is placed, the double cylinder 3 is controlled by a PLC control unit (existing control unit) to push the top block 6 forward, causing the heat-resistant sponge 9 to contact the workpiece. As the stroke of the double cylinder 3 increases, the heat-resistant sponge 9 deforms according to the shape of the workpiece, achieving radial clamping. Subsequently, the PLC control unit controls the pressure plate 10 to move downward, achieving axial clamping of the workpiece.

[0034] The base 1 is responsible for supporting the overall structure. The upper surface of the base 1 is machined with positioning grooves and threaded holes to realize the positioning and installation of the cylinder positioning block 2 and the guide rail 4. The bottom of the base 1 is machined with a keyway, which is connected to the reducer through a key to realize the transmission of motion. The motor is connected to the reducer. When the motor works, it drives the base 1 to rotate, thereby driving the workpiece to rotate.

[0035] The cylinder positioning block 2 is installed in the positioning groove on the periphery of the base 1 and is connected to the base 1 by bolts to realize the positioning and installation of the double cylinder 3.

[0036] The double cylinder 3 operates stably and is mounted on the cylinder positioning block 2, connected to the cylinder positioning block 2 via a threaded connection.

[0037] The guide rail slider assembly is installed in the positioning groove of the base 1 (where slider 5 is slidably connected to guide rail 4, and guide rail 4 is installed in the positioning groove). After leveling with a marble ruler and dial indicator, it is fixed in the positioning groove by bolt connection, and the installation accuracy requirements must be ensured.

[0038] The top block 6 is connected to the output end of the double cylinder 3 and the slider 5 by bolts. The front end of the top block 6 is machined with a bevel and a threaded hole for mounting the ball joint 7. When the double cylinder 3 is working, its piston rod pushes the top block 6 and the ball joint 7 forward. The guide rail slider group ensures the stability of the movement.

[0039] The ball joint 7 is fixed to the inclined surface of the top block 6 by bolts and threaded holes, and can achieve angular rotation within a certain range. It can automatically adjust according to the overall slope of the workpiece surface. The ball joint 7 is connected to the sponge pad 8 by threads.

[0040] The sponge pad 8 is machined with threaded holes to connect with the ball joint 7.

[0041] The heat-resistant sponge 9 is bonded to the sponge pad 8 with room temperature curing adhesive. It can withstand a certain temperature and is an open-cell sponge with low rigidity and high flexibility. During the clamping process, the heat-resistant sponge 9 can effectively conform to the surface of irregular workpieces and transmit uniform clamping force. It has good adaptability to any rotating irregular parts.

[0042] The radial clamping mechanism consists of cylinder positioning block 2, double cylinder 3, guide rail slider group, top block 6, ball joint 7, sponge pad 8, and heat-resistant sponge 9. The radial clamping mechanism has multiple sets, which are evenly distributed in a circle to achieve uniform clamping of the workpiece at multiple positions in the circumferential direction.

[0043] The pressure plate 10 is electrically connected to the PLC control unit. The PLC control unit controls the downward pressure to ensure the axial clamping of the workpiece.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A laser transmission welding fixture for a plastic unequal-diameter rotating body, characterized in that, include: The base (1), rotating mechanism, multiple sets of radial clamping mechanisms and axial clamping mechanism are arranged in a circular pattern. The workpiece is placed in the middle of the upper surface of the base (1). The rotating mechanism is installed below the base (1). The multiple sets of radial clamping mechanisms are evenly distributed in a circular pattern. The radial clamping mechanism includes a pushing mechanism and a heat-resistant sponge (9). The pushing mechanism is installed on the upper surface of the base (1). The heat-resistant sponge (9) is connected to the output end of the pushing mechanism and is used to contact the outer surface of the workpiece and deform according to the shape of the workpiece to achieve radial clamping of the workpiece. The axial clamping mechanism is located above the workpiece and is used to achieve axial clamping of the workpiece.

2. The laser transmission welding fixture for plastic unequal-diameter rotating bodies according to claim 1, characterized in that, The radial clamping mechanism includes a double cylinder (3), a guide rail (4), a slider (5), and a top block (6). The double cylinder (3) and the guide rail (4) are both mounted on the base (1). The output end of the double cylinder (3) is connected to the top block (6). The top block (6) is connected to the slider (5). The slider (5) is slidably connected to the guide rail (4). The front end of the top block (6) is connected to the heat-resistant sponge (9) through a connecting structure.

3. The laser transmission welding fixture for plastic unequal-diameter rotating bodies according to claim 2, characterized in that, The connection structure includes a ball joint (7) and a sponge pad (8). The ball joint (7) is installed at the front end of the top block (6) to achieve angular rotation within a certain range. The sponge pad (8) is connected to the ball joint (7), and the heat-resistant sponge (9) is connected to the sponge pad (8).

4. The laser transmission welding fixture for plastic unequal-diameter rotating bodies according to claim 3, characterized in that, The front end of the top block (6) is provided with an inclined surface, and a threaded hole is provided on the inclined surface. The ball joint (7) is installed on the inclined surface by bolts and threaded holes.

5. The laser transmission welding fixture for plastic unequal-diameter rotating bodies according to claim 3, characterized in that, The heat-resistant sponge (9) is an open-cell sponge and is bonded to the sponge pad (8) with room temperature curing adhesive.

6. The laser transmission welding fixture for plastic unequal-diameter rotating bodies according to claim 2, characterized in that, A cylinder positioning block (2) is installed on the base (1), and the double cylinder (3) is installed on the cylinder positioning block (2).

7. The laser transmission welding fixture for plastic unequal-diameter rotating bodies according to claim 6, characterized in that, The base (1) is provided with a positioning groove, and the cylinder positioning block (2) and the guide rail (4) are both installed in the positioning groove.

8. The laser transmission welding fixture for plastic unequal-diameter rotating bodies according to claim 1, characterized in that, The axial clamping mechanism includes a pressure plate (10), which is electrically connected to the PLC control unit.

9. The laser transmission welding fixture for plastic unequal-diameter rotating bodies according to claim 1, characterized in that, The rotating mechanism includes a motor and a reducer. The bottom of the base (1) is machined with a keyway. The reducer is connected to the base (1) through a key and a keyway. The motor is connected to the reducer.

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