Double-cone internal expansion belt positioning quick-change clamp for nonmetal carbon fiber tube parts

Abstract

The utility model relates to the technical field of carbon fiber tube parts, in particular to a nonmetal carbon fiber tube part double-cone internal expansion belt positioning quick-change clamp which comprises a positioning table, guide rails, sliding blocks and an internal expansion supporting plate, the four guide rails are symmetrically installed on the top of the positioning table, the sliding blocks are connected to the guide rails in a sliding mode, and the internal expansion supporting plate is arranged on the positioning table. The top of each sliding block is provided with an inner expansion supporting plate, the inner expansion supporting plates extend upwards in a vertical state, the faces, close to each other, of the inner expansion supporting plates are symmetrically located in the center of the positioning table, and intervals are reserved between the faces. Through the double-cone structure that the first conical surface at the upper end of the inner expansion supporting plate makes contact with the pipe wall and the second conical surface at the lower portion of the inner expansion supporting plate is matched with the groove of the limiting base, radial even stress supporting and axial accurate positioning are achieved, and the problem that a traditional clamp is not accurate in Z-direction positioning is solved; the motor drives the lead screw to be matched with the lifting block to control radial expansion or contraction of the inner expansion supporting plate, the electric push rod is combined to synchronously adjust the outer clamping rod, and rapid adaptation and replacement of different pipe diameters are achieved.

Description

Technical Field

[0001] This utility model relates to the technical field of carbon fiber tube parts, and in particular to a double-cone internal expansion belt positioning quick-change fixture for non-metallic carbon fiber tube parts. Background Technology

[0002] Non-metallic carbon fiber tubular parts refer to tubular structural components made from carbon fiber composite materials, the material itself containing no metallic elements. These parts are formed by combining carbon fiber bundles with a resin matrix and processing them using specific techniques, resulting in a combination of lightweight and high strength.

[0003] Most existing fixtures for processing carbon fiber tube parts rely on a single rigid internal expansion mechanism or external clamping structure. Uneven radial support can easily cause tube misalignment (especially for tubes with a large length-to-diameter ratio). In addition, the lack of a precise axial positioning mechanism leads to excessive coaxiality during drilling and end face processing, resulting in insufficient product yield. Furthermore, existing fixtures usually require manual adjustment of locking bolts or replacement of adaptable parts, with single tube diameter switching taking more than 15 minutes. Repeated clamping can easily introduce cumulative positioning errors, which seriously restricts the demand for multi-variety, small-batch production.

[0004] To address this issue, a double-cone internal expansion belt positioning quick-change fixture for non-metallic carbon fiber tube parts was specially designed to solve the aforementioned technical problems. Utility Model Content

[0005] In order to overcome the shortcomings of the existing technology, this utility model provides a double-cone internal expansion belt positioning quick-change fixture for non-metallic carbon fiber tube parts.

[0006] The technical implementation scheme of this utility model is as follows: a quick-change fixture for positioning double-cone internal expansion bands of non-metallic carbon fiber tube parts, including a positioning platform, guide rails, sliders, internal expansion plates, lifting blocks, motors, lead screws, and connecting rods. Four guide rails are symmetrically installed on the top of the positioning platform, and sliders are slidably connected to each guide rail. An internal expansion plate is provided on the top of each slider. The internal expansion plates extend vertically upward. The sides of each internal expansion plate that are close to each other are symmetrically located at the center of the positioning platform, with a gap between them. A lifting block is slidably connected to the middle of the top of the positioning platform. A motor is installed in the middle of the top of the positioning platform. A lead screw is connected to the output shaft of the motor. The lead screw is rotatably connected to the lifting block. Symmetrical connecting rods are hinged to the sides of the lifting block corresponding to the close surfaces of each internal expansion plate. The outward end of the connecting rod is hinged to the close surface of the corresponding internal expansion plate.

[0007] Furthermore, the upper end of the inner expansion support plate is provided with a first conical surface, and the lower top surface of the inner expansion support plate protrudes and is provided with a second conical surface, forming a double conical surface mating structure.

[0008] Furthermore, it also includes a limit plate, a guide rod, a pressure plate, a return spring, a connecting rope, and a counterweight block. The limit plate is slidably connected to the top of the inner expansion plate. A guide rod is provided on the top of the inner expansion plate. The limit plate is slidably connected to the guide rod on the outside. A pressure plate is connected to the top of the limit plate. One end of the pressure plate extends horizontally outward and is made of elastic material. A return spring is arranged around the limit plate and the guide rod. A connecting rope is connected to the top of the pressure plate. The end of each connecting rope extends vertically downward and is close to the upper part of the lifting block. A counterweight block is provided at the lower end of each connecting rope.

[0009] Furthermore, the top of the counterweight block is provided with a semi-circular ring for external pulling.

[0010] Furthermore, it also includes a limiting seat, an outer clamping rod, and an electric push rod. A limiting seat is provided on the top surface of the lower part of the inner tension support plate. An outer clamping rod is slidably connected to the top of the limiting seat. An electric push rod is installed on the outside of the limiting seat. The telescopic rod of the electric push rod slides into the interior of the limiting seat. The lower end of the outer clamping rod slides into the interior of the limiting seat and connects with the telescopic rod of the electric push rod.

[0011] Furthermore, a concave conical groove is provided at the lower part of the limiting seat near the inner expansion plate to adapt to the conical mating structure of the lower top surface of the inner expansion plate.

[0012] Furthermore, the outer clamp rod is shaped like a smooth cylindrical rod.

[0013] Compared with the prior art, this utility model has the following advantages: 1. This utility model achieves radial uniform force support and axial precise positioning through the double cone structure of the upper first cone surface of the inner expansion plate contacting the pipe wall and the lower second cone surface cooperating with the groove of the limiting seat, thus solving the problem of inaccurate Z-axis positioning of traditional clamps; the motor-driven screw, in conjunction with the lifting block, controls the radial expansion or contraction of the inner expansion plate, and the electric push rod synchronously adjusts the outer clamping rod to achieve rapid adaptation and replacement of different pipe diameters; the elastic pressure plate and smooth outer clamping rod design avoid scratching the inner wall of the carbon fiber tube, and the return spring stores force to ensure axial fixation stability.

[0014] 2. This utility model uses a counterweight pull block and a connecting rope linkage limit plate to press the upper end of the pipe fitting, forming a double protection against accidental detachment.

[0015] 3. This utility model uses the central gap formed by the four internal expansion plates in the contracted state to form a physical clearance zone for the tool path, which, together with the positioning table and guide rail layout, allows milling cutters, drills and other equipment to contact the end face and outer wall of the carbon fiber tube without obstruction during axial and radial movement, avoiding the processing blind spots caused by the structural redundancy of traditional fixtures. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0017] Figure 2 This is a three-dimensional structural diagram of the positioning platform, guide rail, and slider components of this utility model.

[0018] Figure 3 This is a three-dimensional structural diagram of the internal expansion support plate, lifting block, motor, and other components of this utility model.

[0019] Figure 4 This is a three-dimensional structural diagram of the limiting plate, guide rod, and pressure plate components of this utility model.

[0020] Figure 5 This is a three-dimensional sectional view of the limiting seat, external clamping rod, and electric push rod of this utility model.

[0021] Figure 6 This is a plan view of the positioning platform, guide rail, and inner expansion plate of this utility model.

[0022] Reference numerals: 1. Positioning platform, 2. Guide rail, 3. Slider, 4. Inner tension plate, 5. Lifting block, 6. Motor, 7. Lead screw, 8. Connecting rod, 9. Limiting plate, 10. Guide rod, 101. Pressure plate, 102. Return spring, 11. Connecting rope, 12. Counterweight pull block, 13. Limiting seat, 14. Outer clamping rod, 15. Electric push rod. Detailed Implementation

[0023] The present invention will now be described more fully below with reference to the accompanying drawings, in which presently preferred embodiments of the invention are shown. However, the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided for thoroughness and completeness and to fully convey the scope of the invention to those skilled in the art.

[0024] Example: A quick-change fixture for positioning non-metallic carbon fiber tube parts with a double-cone internal expansion band, such as... Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 6As shown, the fixture includes a positioning table 1, guide rails 2, sliders 3, inner expansion plates 4, lifting blocks 5, a motor 6, a lead screw 7, and a connecting rod 8. The positioning table 1 serves as the mounting reference surface for the fixture and is fixed by a machine tool chuck to achieve overall positioning. Four guide rails 2 are symmetrically installed on the top of the positioning table 1 by bolts. Each guide rail 2 is slidably connected to a slider 3, which slides with the guide rail 2 through a dovetail groove. Each slider 3 has an inner expansion plate 4 on its top. The guide rails 2 provide a radial motion track. The sliders 3 drive the inner expansion plates 4 to slide precisely along the guide rails 2, achieving adaptive clamping of the pipe fitting's inner diameter. The upper end of the inner expansion plate 4 has a first conical surface, and the lower top surface of the inner expansion plate 4 protrudes and has a second conical surface. The two conical surfaces form a double-conical surface mating structure. The inner expansion plate 4 extends vertically upwards. Each inner expansion plate 4 has its adjacent side symmetrically positioned at the center of the positioning platform 1, with a gap between them. A lifting block 5 is slidably connected to the top center of the positioning platform 1. A motor 6 is installed in the top center of the positioning platform 1. A lead screw 7 is connected to the output shaft of the motor 6. The lead screw 7 is rotatably connected to the lifting block 5. Symmetrical connecting rods 8 are hinged to the outer side of the lifting block 5 corresponding to the adjacent surfaces of each inner expansion plate 4. The outward end of the connecting rod 8 is hinged to the adjacent surface of the corresponding inner expansion plate 4. The lifting block 5 is driven by the lead screw 7, and the vertical motion is converted into the radial expansion or contraction of the inner expansion plate 4 through the connecting rod 8. The lifting block 5 is connected to the lead screw 7 by a threaded pair. The two ends of the connecting rod 8 are respectively hinged to the lifting block 5 and the inner expansion plate 4. The inner expansion plate 4, the lifting block 5, the motor 6, the lead screw 7 and the connecting rod 8 together form the inner expansion mechanism.

[0025] like Figure 2 , Figure 3 and Figure 5 As shown, it also includes a limiting plate 9, a guide rod 10, a pressure plate 101, a return spring 102, a connecting rope 11, and a counterweight pull block 12. The limiting plate 9 is slidably connected to the top of the inner expansion support plate 4. The guide rod 10 is provided on the top of the inner expansion support plate 4. The limiting plate 9 is slidably connected to the guide rod 10. The pressure plate 101 is connected to the top of the limiting plate 9. One end of the pressure plate 101 extends horizontally outward and is made of elastic material. The return spring 102 is arranged around the limiting plate 9 and the guide rod 10. The pressure plate 101, made of elastic material, generates frictional resistance through deformation to pre-fix the pipe. The return spring 102 provides axial clamping force. The top of the pressure plate 101 is connected to the connecting rope 11. The end of each connecting rope 11 extends vertically downward and is close to the upper part of the lifting block 5. The lower end of each connecting rope 11 is provided with a counterweight pull block 12. The top of the counterweight pull block 12 is provided with a semi-circular ring for external pulling.

[0026] like Figure 2 , Figure 4 and Figure 5As shown, it also includes a limiting seat 13, an outer clamping rod 14, and an electric push rod 15. The limiting seat 13 is provided on the top surface of the lower part of the inner expansion plate 4. The lower part of the limiting seat 13 near the inner expansion plate 4 has a concave conical groove to adapt to the conical mating structure of the lower top surface of the inner expansion plate 4. The top of the limiting seat 13 is slidably connected to the outer clamping rod 14. The outer clamping rod 14 is in the shape of a smooth cylindrical rod. The smooth outer clamping rod 14 is driven by the electric push rod 15 and works with the inner expansion mechanism to achieve bidirectional clamping of the pipe fitting inside and outside to avoid scratches. The electric push rod 15 is installed on the outside of the limiting seat 13 by bolts. The telescopic rod of the electric push rod 15 slides into the interior of the limiting seat 13. The lower end of the outer clamping rod 14 slides into the interior of the limiting seat 13 and is connected to the telescopic rod of the electric push rod 15.

[0027] In use, the positioning table 1 of this fixture is installed on the machine tool chuck. The outer diameter and end face are measured using a dial indicator, strictly controlling the coaxiality, perpendicularity, and end face runout error to within 0.01mm. After the positioning table 1 is fixed by the machine tool chuck, the motor 6 drives the lead screw 7 to rotate, causing the lifting block 5 to move down to its initial position. At this time, the inner expansion plate 4 remains in a contracted state through the connecting rod 8 mechanism. The electric push rod 15 synchronously retracts, driving the outer clamping rod 14 to the end position at the top of the limit seat 13. The pressure plate 101 is in a raised position under the action of the return spring 102. The operator inserts the carbon fiber tube into the central space formed by the four inner expansion plates 4. The inner wall of the tube contacts the elastic pressure plate 101, causing it to bend and deform, generating frictional resistance. The lower end of the tube naturally falls to the protruding limit position of the second conical surface of the inner expansion plate 4. The counterweight block 12 is pulled up, and the limit plate 9 slides upward along the guide rod 10 through the connecting rope 11. The outer edge of the pressure plate 101... The upper end of the tube is exposed and held against it. At the same time, the return spring 102 stores the force to complete the axial fixation. The motor 6 drives the lifting block 5 to move upward. The connecting rod 8 pushes the inner expansion plate 4 to expand radially along the guide rail 2. The double conical surface (the first conical surface contacts the tube wall and the second conical surface cooperates with the groove of the limit seat 13) to achieve uniform force support. In addition, the electric push rod 15 extends to push the smooth outer clamping rod 14 to fit against the outer wall of the tube, forming a coordinated clamping between the inside and outside. Finally, due to the center gap formed by the four inner expansion plates 4 in the contracted state, in conjunction with the layout of the positioning table 1 and the guide rail 2, a physical clearance area is provided for the tool path. This allows milling cutters, drills and other equipment to contact the end face and outer wall of the carbon fiber tube without obstruction during axial and radial movement. This avoids the processing blind spots caused by the structural redundancy of traditional fixtures. By completing multiple operations such as end face milling and drilling within the clearance space, the need for repeated clamping of workpieces is reduced, making it suitable for the composite processing flow of carbon fiber tube parts.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit the scope of protection of this utility model. Although this utility model 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 this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A quick-change fixture for positioning non-metallic carbon fiber tube parts with a double-cone internal expansion band, comprising a positioning table (1), characterized in that: It also includes guide rails (2), sliders (3), inner expansion plates (4), lifting blocks (5), motors (6), lead screws (7) and connecting rods (8). Four guide rails (2) are symmetrically installed on the top of the positioning platform (1). Each guide rail (2) is slidably connected to a slider (3). Each slider (3) is provided with an inner expansion plate (4) on its top. The inner expansion plates (4) extend vertically upwards. The sides of each inner expansion plate (4) that are close to each other are symmetrically located on the positioning platform (1). The center position is provided with a gap. A lifting block (5) is slidably connected to the top center of the positioning platform (1). A motor (6) is installed in the top center of the positioning platform (1). A lead screw (7) is connected to the output shaft of the motor (6). The lead screw (7) is rotatably connected to the lifting block (5) on the outside. Symmetrical connecting rods (8) are hinged to the corresponding inner expansion plates (4) on the outside of the lifting block (5). The outward end of the connecting rod (8) is hinged to the corresponding inner expansion plate (4) near the surface.

2. The double-cone internal expansion belt positioning quick-change fixture for non-metallic carbon fiber tube parts as described in claim 1, characterized in that: The upper end of the inner expansion support plate (4) is provided with a first conical surface, and the lower top surface of the inner expansion support plate (4) protrudes and is provided with a second conical surface. The two conical surfaces form a double conical surface mating structure.

3. The double-cone internal expansion belt positioning quick-change fixture for non-metallic carbon fiber tube parts as described in claim 2, characterized in that: It also includes a limiting plate (9), a guide rod (10), a pressure plate (101), a return spring (102), a connecting rope (11), and a counterweight pull block (12). The limiting plate (9) is slidably connected to the top of the inner expansion plate (4). The guide rod (10) is provided on the top of the inner expansion plate (4). The limiting plate (9) is slidably connected to the guide rod (10) on the outside. The pressure plate (101) is connected to the top of the limiting plate (9). One end of the pressure plate (101) extends horizontally outward, and the pressure plate (101) is made of elastic material. The return spring (102) is arranged around the limiting plate (9) and the guide rod (10). The connecting rope (11) is connected to the top of the pressure plate (101). The end of each connecting rope (11) extends vertically downward and is close to the upper part of the lifting block (5). The lower end of each connecting rope (11) is provided with a counterweight pull block (12).

4. The double-cone internal expansion belt positioning quick-change fixture for non-metallic carbon fiber tube parts as described in claim 3, characterized in that: The counterweight block (12) has a semi-circular ring at the top for external pulling.

5. A quick-change fixture for positioning non-metallic carbon fiber tube parts with a double-cone internal expansion band as described in claim 4, characterized in that: It also includes a limiting seat (13), an outer clamping rod (14) and an electric push rod (15). The limiting seat (13) is provided on the top surface of the lower part of the inner expansion plate (4). The outer clamping rod (14) is slidably connected to the top of the limiting seat (13). An electric push rod (15) is installed on the outside of the limiting seat (13). The telescopic rod of the electric push rod (15) slides into the inside of the limiting seat (13). The lower end of the outer clamping rod (14) slides into the inside of the limiting seat (13) and is connected to the telescopic rod of the electric push rod (15).

6. The double-cone internal expansion belt positioning quick-change fixture for non-metallic carbon fiber tube parts as described in claim 5, characterized in that: The lower part of the limiting seat (13) near the inner expansion plate (4) has a concave conical groove to fit the conical mating structure of the lower top surface of the inner expansion plate (4).

7. A quick-change fixture for positioning non-metallic carbon fiber tube parts with a double-cone internal expansion band as described in claim 6, characterized in that: The outer clamp rod (14) is a smooth cylindrical rod.

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