Special clamp for well completion tool parts

Abstract

According to the special clamp for the well completion tool part, a through moving groove is formed in a chuck in the axial direction of the part and comprises a straight groove allowing the part to eccentrically move and two positioning grooves located in the two ends of the straight groove; the side wall of the chuck is provided with at least one pair of threaded holes which are oppositely distributed in the circumferential direction, the pressing studs are screwed into the threaded holes respectively, and the ends of the pressing studs fix parts capable of eccentrically moving. According to the utility model, the moving groove of the chuck is matched with the pressing stud, so that the gun drilling processing of two fixed dot eccentric holes and any radial position of a part can be completed by clamping at one time, the workpiece reloading time and the production auxiliary time are reduced, and meanwhile, the clamping precision of the workpiece can be ensured.

Description

Technical Field

[0001] This utility model relates to auxiliary tools for machining mechanical parts, specifically a special fixture for well completion tool parts. Background Technology

[0002] With the development of technology, the requirements for machining precision of mechanical workpieces are becoming increasingly higher, especially for complex-shaped workpieces such as shells. To produce ideal products, not only are high-precision machine tools required, but also the design and application of reasonably structured fixtures during the machining process; currently, the application of fixtures is developing towards high efficiency and low labor intensity.

[0003] Previously, when machining well completion tool parts, if general-purpose jigs were used, for workpieces requiring machining on multiple sides, each side had to be machined before the workpiece could be removed from the jig, re-clamped, and then the next side could be machined. Therefore, multiple clamping operations were typically required when machining several sides. This method was not only slow and cumbersome, with repeated disassembly and reassembly being time-consuming and labor-intensive, significantly impacting machining speed, but it also introduced installation errors, directly affecting the machining quality of the workpiece.

[0004] CN218745046U discloses an eccentric hole machining fixture, including a chuck for clamping the workpiece to be drilled; and a pad for contacting the assembly plane of the workpiece. A locking mechanism causes the pad to move radially inward, fixing the workpiece in the chuck. This fixture achieves eccentric displacement, but it cannot be quickly replaced during operation, requiring repeated disassembly and assembly. It cannot meet the need for rapidly machining multiple eccentric holes or gun-drilled holes on a tubular part. Summary of the Invention

[0005] To address existing problems, this utility model designs a special fixture for well completion tool parts, providing a clamping structure solution that can reduce workpiece changeover time and production auxiliary time during the processing of complex parts, while ensuring workpiece clamping accuracy and promoting production efficiency.

[0006] To achieve the above objectives, the technical solution adopted in this utility model is used to process eccentric holes and gun-drilled holes on cylindrical parts, including a chuck for fixing the parts, the chuck being fixed on a mounting bracket. The chuck has a through moving groove, the extending direction of which is parallel to the axial direction of the part. The moving groove includes a straight groove for eccentric movement of the part and two positioning grooves located at both ends of the straight groove; the side wall of the chuck has at least a pair of threaded holes distributed circumferentially opposite each other, and clamping studs are screwed into the threaded holes respectively, the ends of the clamping studs fixing the eccentrically movable part.

[0007] The mounting bracket is provided with several vertical lifting threaded holes, and the upper base plate is provided with corresponding lifting and fixing holes; the lifting screw is screwed into the lifting threaded holes and lifting and fixing holes in sequence to realize the up and down displacement and fixing of the mounting bracket and parts.

[0008] It also includes a base standard plate for connecting with a standard machine tool. The upper end face of the base standard plate has a recessed part, and the upper bottom plate is placed in the recessed part and moves horizontally.

[0009] The recessed portion has at least one pair of translation threaded holes on opposite sides. Translation screws are screwed into the translation threaded holes, and their ends fix the opposite sides of the horizontally movable upper base plate.

[0010] The outer wall of the part is provided with a pressure cover as a protective layer. The pressure cover is located in the moving groove of the chuck, and the outer wall of the chuck is in contact with the end of the clamping stud.

[0011] The invention also includes a variable static balance structure, comprising an inner ring, an outer ring, a balance block, and several pins. The inner ring is fitted onto the outer wall of the part, and the outer ring is fitted over the inner ring. A balance block for counterweight is located between the inner and outer rings. Several pins pass through several through holes on the outer ring, the balance block, and the inner ring in sequence to secure the part. Compared with existing technologies, this invention, through the interaction of the chuck's moving groove and the clamping stud, can achieve one-time clamping and completion of gun drilling for two fixed-point eccentric holes and arbitrary radial positions of the part. Furthermore, in the processing of complex workpieces, it can reduce workpiece changeover time and production auxiliary time, while ensuring workpiece clamping accuracy and promoting increased production efficiency, thus reducing labor intensity. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0013] Figure 2 A schematic diagram of the chuck and its assembled components;

[0014] Figure 3 This is a cross-sectional view of the present invention;

[0015] Figure 4 Schematic diagram of a variable static equilibrium structure

[0016] See attached figures: 101 Part; 201 Chuck; 202 Moving slot; 301 Mounting bracket; 302 Lifting screw; 401 Upper base plate; 501 Base standard plate; 502 Translation screw; 601 Clamping stud; 701 Pressure cap; 800 Variable static balance structure; 801 Inner ring; 802 Outer ring; 803 Balance block; 804 Pin. Detailed Implementation

[0017] The present invention will now be further described with reference to the accompanying drawings.

[0018] See Figures 1 to 3 , Figures 1 to 3 This embodiment illustrates one example of the present invention. This embodiment is used to process two eccentric holes and four gun drill holes along the axial direction on multiple parts of a cylindrical part. It mainly includes: two chucks for fixing the two ends of the part, the two chucks are respectively fixed on two mounting brackets, and the lower ends of the mounting brackets are respectively fixed on the upper end surface of the upper base plate.

[0019] The chuck has a moving groove in the middle of its body. The moving groove extends parallel to the central axis of the part and passes through both end faces of the chuck. Its cross-sectional shape is similar to an elliptical hole. Specifically, the moving groove includes a straight groove in the middle for the part to move radially eccentrically, and two positioning grooves at both ends of the straight groove.

[0020] The width of the straight groove is adapted to the diameter of the part, and its middle part covers the center of the chuck. Moving the part along the straight groove allows for eccentric displacement relative to the lathe tool at different distances. In machining parts with two axial eccentric holes, repositioning can be completed simply by adjusting the movement distance along the straight groove, without requiring overall disassembly and reassembly. The cross-sectional shape of the positioning groove is adapted to the outer wall of the part; in this embodiment, it is set to semi-circular. The groove surface of the positioning groove is at the end of the part's eccentric movement stroke.

[0021] After the part is inserted into the moving slots of the two chucks at both ends, it is first moved to the position of the first eccentric distance, and then the part is fixed. In this embodiment, two pairs of threaded holes arranged circumferentially opposite each other are provided on the side wall of the chuck. The four threaded holes are respectively provided on the side wall at the end of the two positioning slots and are arranged along the axial direction of the part; the extension direction of the threaded holes is parallel to the direction of the eccentric movement of the part. During the fixing process, four clamping studs are respectively screwed into the four threaded holes on both sides of the part. The inner ends of the clamping studs after being screwed in abut against the outer wall of the part to fix it. At this time, the first eccentric hole can be machined.

[0022] When machining the second eccentric hole, the eccentric position of the part is changed by rotating the four clamping studs and adjusting the screw-in distance of their inner ends. The part moves along the moving groove until it reaches the second eccentric distance position. Then, the aforementioned fixing operation is repeated to finally complete the machining of the second eccentric hole. In this embodiment, the eccentric distance of the part can be changed inside the chuck through rapid positioning and clamping without the need for reassembly and reassembly. Therefore, multiple eccentric holes can be machined with only one clamping of the well completion tool parts, eliminating the installation errors that occur in existing fixtures under multiple clamping conditions, improving machining quality and CNC machine tool machining efficiency.

[0023] Further, see Figure 1 and Figure 3The two mounting brackets are vertical plates, perpendicular to the axis of the part. Vertical lifting threaded holes are formed on both sides of the plates; these holes are through holes. Corresponding lifting and fixing holes are provided on the upper base plate. Two lifting screws are screwed into the lifting threaded holes in sequence, with their lower ends inserted into the lifting and fixing holes. Rotating the lifting screws adjusts the vertical movement of the plates, thereby achieving the vertical displacement and fixing of the mounting brackets and parts. When using a gun drill, adjusting the relative position of the upper base plate and the mounting brackets allows for drilling at the desired location.

[0024] Further, see Figure 1 and Figure 3 Below the upper base plate is a standard base plate, which allows for connection to standard machine tools, enabling compatibility with conventional lathes and fixed gun drills. The upper surface of the standard base plate has a recessed section, within which the upper base plate can be placed and moved horizontally. After movement, it needs to be secured; therefore, two pairs of horizontally extending translational threaded holes are provided on the two opposite sides of the recessed section. Four translational screws are screwed into these threaded holes, with their ends abutting against the two opposite sides of the upper base plate, thus fixing the upper base plate in place.

[0025] Further, see Figure 3 The part is wrapped with a protective cover, which is set on the outer wall of the part located in the chuck moving groove. The inner end of the clamping stud acts directly on the protective cover to avoid damage to the part.

[0026] Because in the aforementioned processing, only both ends of the part are fixed, resulting in a relatively long overhang in the middle section. Furthermore, the part's eccentric holes and gun-drilled holes cause a shift in its center of gravity. Therefore, as a preferred option, see [reference needed]. Figure 2 and Figure 4 It also includes a variable static balance structure, comprising an inner ring, an outer ring, a balance block, and several pins. The inner ring is fitted onto the outer wall of the middle section of the component, and the outer ring is fitted onto the outside of the inner ring. A balance block for counterweight is located between the inner and outer rings. Three sets of circumferentially distributed through holes are provided on the outer ring, balance block, and inner ring, respectively. A corresponding number of pins pass through the through holes on the outer ring, balance block, and inner ring in sequence to complete the relative fixation of the balance block and the component. The variable static balance structure can rotate around the well completion component. Removing the pins and rotating the static balance block can change the static balance counterweight. The three freely movable balance blocks can make the axis of the component more level and can also reduce wobble during drill bit machining, improving drilling accuracy.

[0027] This embodiment utilizes the interaction between the chuck's moving slot and the clamping stud to achieve simultaneous clamping and drilling of two fixed-point eccentric holes and arbitrary radial positions on the part. Furthermore, in machining complex workpieces, it reduces workpiece changeover time and production auxiliary time, while ensuring workpiece clamping accuracy and promoting increased production efficiency, thus reducing labor intensity.

[0028] The embodiments of this utility model have been described above with reference to the accompanying drawings and examples. The structures given in the embodiments do not constitute a limitation on this utility model. Those skilled in the art can make adjustments as needed, and various modifications or variations within the scope of the appended claims are all within the scope of protection.

Claims

1. A special fixture for well completion tool parts, used for machining eccentric holes and gun drill holes on cylindrical parts, comprising a chuck for fixing the parts, the chuck being fixed on a mounting bracket, characterized in that: The chuck is provided with a through moving groove, including a straight groove for the part to move eccentrically, and two positioning grooves located at both ends of the straight groove; The chuck has at least one pair of threaded holes distributed circumferentially opposite each other on its sidewall. The clamping studs are screwed into the threaded holes respectively, and the ends of the clamping studs fix the eccentrically movable parts.

2. The special fixture for well completion tool parts according to claim 1, characterized in that: The mounting bracket has several vertical lifting threaded holes, and the upper base plate has corresponding lifting and fixing holes; the lifting screw is screwed into the lifting threaded holes and lifting and fixing holes in sequence to realize the up and down displacement and fixing of the mounting bracket and parts.

3. The special fixture for well completion tool parts according to claim 1 or 2, characterized in that: It also includes a base standard plate for connecting with a standard machine tool, the upper end face of which has a recess, and the upper base plate is placed in the recess and moves horizontally.

4. The special fixture for well completion tool parts according to claim 3, characterized in that: At least one pair of translation threaded holes are provided on the opposite sides of the recessed portion. Translation screws are screwed into the translation threaded holes respectively, and their ends fix the opposite sides of the horizontally movable upper base plate.

5. The special fixture for well completion tool parts according to claim 1, characterized in that: The outer wall of the part is provided with a pressure cover as a protective layer. The pressure cover is located in the moving groove of the chuck, and the outer wall of the chuck is in contact with the end of the clamping stud.

6. The special fixture for well completion tool parts according to claim 1, characterized in that: It also includes a variable static balance structure, comprising an inner ring, an outer ring, a balance block, and several pins; wherein the inner ring is fitted on the outer wall of the part, the outer ring is fitted outside the inner ring, and a balance block for counterweight is provided between the inner and outer rings; several pins pass through several through holes on the outer ring, the balance block, and the inner ring in sequence to complete the fixation with the part.

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