Pipe inside support clamp

Abstract

The utility model discloses a pipe inner support clamp, including main shaft, pull rod and clamping assembly, hollow chamber is opened in the main shaft, and pull rod is arranged in the sliding, clamping assembly includes a plurality of circumferential distribution on the slide cavity of main shaft and the telescopic block of sliding arrangement in it, and the outer periphery of pull rod is equipped with the first inclined plane structure, and the inboard of telescopic block is equipped with the second inclined plane structure with it cooperation, and pull rod axial movement passes through the inclined plane cooperation and drives telescopic block radial telescopic, and the outside of telescopic block detachably installs the outer clamping piece for clamping the inner wall of pipe, and realizes automatic reset through annular snap spring, and the axial both sides of main shaft in slide cavity are fixed with annular stopper through bolt, and one end is equipped with dust cover, the utility model discloses the combination of the inclined plane drive and multiple clamping assembly has realized stable inner support clamping, and the design of replaceable outer clamping piece has strengthened the versatility, and the dustproof cover structure of stopper has effectively prevented the dust, has improved the reliability, is applicable to the inner support fixed processing of multiple pipe.

Description

Technical Field

[0001] This utility model relates to the technical field of internal support clamps, specifically an internal support clamp for pipe fittings. Background Technology

[0002] In the machining of tubular parts, such as turning and milling, internal support fixtures are often used to tighten and fix the pipe from the inside to ensure stability and accuracy during machining. Traditional internal support fixtures for pipes mostly adopt a single conical drive structure, using the axial movement of a tie rod to drive the radial expansion of the expansion sleeve or jaws to achieve clamping. However, such fixtures are usually only suitable for pipes with a specific inner diameter range, with poor adaptability. When changing to different specifications of pipes, the entire fixture must be replaced, which is costly and inefficient. Furthermore, metal shavings generated during machining can easily intrude into the clearance of the moving parts of the fixture, causing jamming, wear, and even damage to the mechanism, affecting the life and reliability of the fixture. Therefore, there is an urgent need for a pipe internal support fixture that provides stable clamping, strong versatility, and is resistant to contamination and jamming. Utility Model Content

[0003] The purpose of this utility model is to provide a pipe fitting internal support clamp, which effectively solves the technical problems of unstable clamping, poor adaptability and easy jamming by debris in traditional pipe fitting internal support clamps through inclined surface cooperation and replaceable external clamping plate structure, and achieves the technical effects of significantly improving processing accuracy, enhancing versatility and ensuring long-term operational reliability.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a pipe fitting internal support clamp, comprising a main shaft, characterized in that a hollow cavity is formed within the main shaft, and a pull rod is slidably disposed within the hollow cavity; a plurality of sliding cavities are formed on the main shaft along its axial direction, and a telescopic block is slidably disposed within each sliding cavity; a first inclined surface structure is provided on the outer circumferential surface of the pull rod, and a second inclined surface structure that cooperates with the first inclined surface structure is provided on the side of the telescopic block near the axis of the main shaft; wherein, the axial movement of the pull rod can drive the telescopic block to extend and retract radially through the sliding cooperation between the first inclined surface structure and the second inclined surface structure.

[0005] In a further technical solution, an outer clamping plate is detachably fixed on the side of the telescopic block away from the main shaft axis.

[0006] In a further technical solution, a first bolt groove is provided on the telescopic block, and a second bolt groove corresponding to the first bolt groove is provided on the outer clamping plate. The telescopic block and the outer clamping plate are fixed by bolt connection.

[0007] A further technical solution is that the telescopic block is provided with a retaining ring groove, and an annular retaining ring is installed in the retaining ring groove and sleeved on the outside of all the telescopic blocks.

[0008] In a further technical solution, annular stops are fixed to both sides of the sliding cavity on the main shaft by bolts.

[0009] In a further technical solution, a dust cover for sealing the hollow cavity is fixed to one end of the main shaft.

[0010] In a further technical solution, a flange for connecting to external equipment is fixed on the outer circumferential surface of the spindle.

[0011] In a further technical solution, a limiting block is fixed on one side of the stop block facing the telescopic block, and limiting grooves are formed on both axial sides of the telescopic block, with the limiting block inserted into the limiting grooves.

[0012] In a further technical solution, the sliding cavity is provided with four cavities, which are evenly distributed in a circle with the axis of the main shaft as the center.

[0013] In a further technical solution, the sliding cavity is provided in two sets, with four in each set. The two sets of sliding cavities are distributed at different axial positions on the outer periphery of the main shaft. Correspondingly, the telescopic block and the outer clamping plate are also provided in two sets to form a double clamping assembly.

[0014] In summary, the pipe fitting internal support clamp provided by this utility model has the following significant advantages compared with the prior art: Stable clamping and high precision: The first inclined structure on the pull rod and the second inclined structure on the telescopic block are precisely matched to convert the axial tension into a synchronous and stable radial expansion force of multiple telescopic blocks. By setting up two sets of clamping components, multi-point and multi-directional balanced support is formed, which greatly improves the clamping rigidity and stability, effectively suppresses processing vibration, and ensures processing accuracy.

[0015] High versatility and convenient changeover: The outer clamp is detachably fixed to the telescopic block by bolt connection. Users can quickly replace the outer clamp of different sizes according to the inner diameter of the pipe to be processed, so that one set of clamps can be adapted to multiple pipe diameters, which significantly improves the versatility of the clamp and reduces equipment investment costs and changeover time.

[0016] Dust and chip prevention, high reliability: By setting annular blocks on both sides of the telescopic block and a dust cover at the end of the spindle, a protective barrier is formed, which can effectively prevent machining chips from entering the gap between the sliding cavity and the telescopic block and the hollow cavity, preventing the mechanism from jamming and abnormal wear, and ensuring the long-term reliability and service life of the fixture.

[0017] Reasonable structure and automatic reset: The design adopts a ring spring sleeved in the spring groove of all telescopic blocks. When the hydraulic cylinder retracts and the pull rod moves downward, it can automatically and synchronously pull all telescopic blocks radially retract and reset by relying on the elastic restoring force of the spring. The action is reliable and no additional reset drive mechanism is required. The structure is compact and reasonable. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is the front view of this application; Figure 2 This application Figure 1 A cross-sectional view along the AA direction; Figure 3 This application Figure 2 Enlarged view of point B in the middle; Figure 4 This is a three-dimensional structural diagram of this application.

[0019] In the diagram: 10. Main shaft; 11. Tie rod; 12. Hollow cavity; 13. First inclined surface structure; 14. Telescopic block; 15. First bolt groove; 16. Outer clamp; 17. Second bolt groove; 18. Stop block; 19. Second inclined surface structure; 20. Dust cover; 21. Flange; 22. Sliding cavity; 23. Snap ring groove; 24. Limiting block; 25. Limiting slide groove; 26. Third bolt groove; 27. Fourth bolt groove. Detailed Implementation

[0020] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.

[0021] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0022] Furthermore, it should be understood in the description of this application that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and are not intended to 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 of the present invention.

[0023] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0024] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0025] like Figures 1-4 As shown, a pipe fitting internal support clamp includes a main shaft 10, a hollow cavity 12 is formed inside the main shaft 10, a pull rod 11 is slidably arranged inside the hollow cavity 12, and a connecting rod is fixedly connected to the bottom of the pull rod 11 by a threaded connection. The connecting rod is poweredly connected to a hydraulic cylinder, which can be a solid rotary hydraulic cylinder. Several clamping components are arranged on the main shaft 10, and the several clamping components are distributed along the axial direction of the main shaft 10. In this embodiment, two clamping components are provided.

[0026] In one embodiment, the clamping assembly includes a plurality of sliding cavities 22 formed on the main shaft 10. The plurality of sliding cavities 22 are evenly distributed in a circular shape with the axis of the main shaft 10 as the center. Telescopic blocks 14 are slidably disposed in the sliding cavities 22. The telescopic blocks 14 are evenly distributed in a circular shape with the axis of the main shaft 10 as the center. A first inclined surface structure 13 is provided on the outer circumferential surface of the pull rod 11. The side of the plurality of telescopic blocks 14 near the axis of the main shaft 10 is provided as a second inclined surface structure 19. The first inclined surface structure 13 can slide and cooperate with the second inclined surface structure 19. The cooperation inclination angle of the first inclined surface structure 13 and the second inclined surface structure 19 can be 11° (specifically, with the axial direction of the main shaft 10 as the reference zero degree, the end of the cooperation surface near the dust cover 20 is inclined at 11° towards the axis of the main shaft 10). By sliding the pull rod 11 in the hollow cavity 12, the first inclined surface structure 13 can press against the second inclined surface structure 19, thereby pushing out the telescopic blocks 14.

[0027] Specifically, in this embodiment, the clamping components in the same group are provided with four sliding cavities 22, and each sliding cavity 22 is slidably provided with a telescopic block 14, so there are four telescopic blocks 14.

[0028] In one embodiment, an outer clamping piece 16 is fixed on the side of the telescopic block 14 away from the axis of the main shaft 10. The outer clamping piece 16 is used to clamp the inner wall of the pipe fitting.

[0029] In one embodiment, the telescopic block 14 and the outer clamp 16 are detachably fixedly connected. The telescopic block 14 has a first bolt groove 15 and the outer clamp 16 has a second bolt groove 17. The first bolt groove 15 and the second bolt groove 17 can be aligned and a bolt can be inserted to fix the outer clamp 16 and the telescopic block 14 together. This allows different outer clamps 16 to be replaced according to the specifications of different pipe fittings to meet the requirements of various pipe fitting inner diameters.

[0030] In one embodiment, a retaining ring groove 23 is provided on the telescopic block 14. The retaining ring groove 23 passes through the telescopic block 14 along the circumferential direction of the main shaft 10 and is used to install a retaining ring. The retaining ring is annular and can pass through several telescopic blocks 14. The annular retaining ring is sleeved on four telescopic blocks 14.

[0031] In one embodiment, the telescopic block 14 is provided with stop blocks 18 on both sides along the axial direction of the main shaft 10 to prevent machining debris from entering the gap between the telescopic block 14 and the sliding cavity 22. The stop blocks 18 are annular and are fitted onto the main shaft 10. The sliding cavity 22 is provided with third bolt grooves 26 on both sides along the axial direction of the main shaft 10. The stop blocks 18 are provided with a plurality of fourth bolt grooves 27. The stop blocks 18 are fixed to the outer periphery of the main shaft 10 by aligning the fourth bolt grooves 27 with the third bolt grooves 26 and inserting bolts.

[0032] In one embodiment, a dust cover 20 is fixed to one end of the spindle 10 to prevent debris from entering the hollow cavity 12.

[0033] In one embodiment, a flange 21 is fixed on the outer periphery of the spindle 10 for fixing the spindle 10 to a machine tool, machining center or robotic arm.

[0034] In one embodiment, a limiting block 24 is fixed on one side of each of the two stops 18 facing the telescopic block 14. A limiting groove 25 is formed on both sides of the telescopic block 14 along the axial direction of the main shaft 10. The limiting block 24 is inserted into the limiting groove 25 to prevent the telescopic block 14 from completely disengaging from the main shaft 10.

[0035] Its working principle is as follows: The central rotary cylinder extends, driving the connecting rod and pull rod to rise and move. Since the telescopic block and the pull rod are in contact at an 11° angle, as the pull rod rises, the telescopic block expands outwards, thereby causing the outer clamping plate to expand outwards and internally support the inner wall of the pipe fitting. When the central rotary cylinder retracts, the snap ring in the snap ring groove forcibly retracts the telescopic block, and the telescopic block and outer clamping plate retract in this way. To accommodate various pipe diameters, the outer clamping plate can be easily replaced with various specifications. The overall structure is designed with two sets of outer clamping plates, using upper and lower sets, with the clamping plate dimensions being the same, making the internal support of the pipe fitting more convenient. The upper and lower stop blocks are designed to prevent cutting chips from entering the telescopic block and affecting the expansion and contraction of the clamping plate. The dust cap design serves the same purpose, preventing chips from entering and affecting the movement of the pull rod and telescopic block. The overall design of the internal support fixture takes into account the simplicity of the structure, practicality, lower processing difficulty, better internal support effect, and stronger overall fixture reliability.

[0036] A method for using a pipe fitting internal support clamp, characterized by comprising the following steps: S1. Installation and Preparation: The spindle 10 is fixedly mounted on a machine tool, machining center or robotic arm via the flange 21 on its outer periphery; according to the inner diameter specification of the pipe to be processed, a matching outer clamp 16 is selected, and the outer clamp 16 is detachably fixed to the telescopic block 14 by aligning the first bolt groove 15 on the telescopic block 14 with the second bolt groove 17 on the outer clamp 16 and inserting bolts; the pipe is sleeved on the outside of the spindle (10) and the spindle 10 is located inside the pipe.

[0037] S2, Perform internal support operation: The hydraulic cylinder (preferably a solid rotary hydraulic cylinder) connected to the bottom of the pull rod 11 is activated, and the piston rod of the hydraulic cylinder is extended. The pull rod 11 is driven to slide upward in the hollow cavity 12 of the main shaft 10 through the connecting rod. When the pull rod 11 moves upward, the first inclined surface structure 13 on its outer periphery slides and engages with the second inclined surface structure 19 on the telescopic block 14, generating a radially outward force. This pushes the multiple telescopic blocks 14 to move outward radially in the corresponding sliding cavities 22, thereby causing the outer clamping pieces 16 fixed on their outer sides to expand outward until all the outer clamping pieces 16 are tightly abutted against and supported on the inner wall of the pipe, thus achieving reliable clamping and fixing of the pipe.

[0038] S3, Perform processing operations: After the pipe is fixed by the stable internal support, the pipe can be cut, ground or otherwise machined by a machine tool, machining center or robotic arm. During this process, the annular blocks 18 installed on the spindle 10 on both sides of the telescopic block 14 can effectively prevent the chips generated during processing from entering the gap between the telescopic block 14 and the sliding cavity 22, ensuring the smooth movement of the mechanism. At the same time, the dust cover 20 installed at the end of the spindle 10 can prevent chips from entering the hollow cavity 12 and protect the tie rod 11 and its mating surface.

[0039] S4. Perform the release operation: After the processing is completed, the piston rod of the hydraulic cylinder is retracted, driving the pull rod 11 to slide downward in the hollow cavity 12. The downward movement of the pull rod 11 releases the radial thrust of the first inclined structure 13 on the second inclined structure 19. At this time, the rebound force of the annular retaining rings pre-installed in the retaining ring grooves 23 of all telescopic blocks 14 takes effect, forcing all telescopic blocks 14 to synchronously retract radially inward along the sliding cavity 22, causing the outer clamping plate 16 to disengage from the inner wall of the pipe and return to the initial position, so that the processed pipe can be removed from the fixture.

[0040] In step S1, the stop block 18 is fixed to the main shaft 10 by aligning its fourth bolt groove 27 with the third bolt grooves 26 on both sides of the slide cavity 22 and inserting bolts; the limiting block 24 on the stop block 18 is inserted into the limiting slide grooves 25 on both sides of the telescopic block 14. This mating structure plays a guiding role when the telescopic block 14 is radially extended and retracted, and prevents the telescopic block 14 from completely detaching from the main shaft 10.

[0041] The clamp is provided with two sets of clamping components distributed along the axis of the main shaft 10. Each set of clamping components includes four telescopic blocks 14 and outer clamping plates 16 evenly distributed around the axis of the main shaft 10. In steps S2 and S4, the two sets of clamping components move synchronously to jointly clamp and release the pipe, which significantly improves the stability and balance of the clamping.

[0042] This completes one full cycle of use for the pipe fitting's internal support clamp. This method achieves efficient, stable, and automated internal support and release actions through hydraulic drive and a sloped mechanical structure. Dustproof and chip-proof design improves reliability, and replaceable outer clamps provide the clamp with excellent versatility.

[0043] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0044] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0045] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A pipe fitting internal support clamp, comprising a main shaft (10), characterized in that, A hollow cavity (12) is formed inside the main shaft (10), and a pull rod (11) is slidably arranged inside the hollow cavity (12). A plurality of sliding cavities (22) are formed on the main shaft (10) along its axial direction, and a telescopic block (14) is slidably arranged inside each sliding cavity (22). A first inclined surface structure (13) is provided on the outer peripheral surface of the pull rod (11), and a second inclined surface structure (19) that cooperates with the first inclined surface structure (13) is provided on the side of the telescopic block (14) near the axis of the main shaft (10). The axial movement of the pull rod (11) can drive the telescopic block (14) to extend and retract radially through the sliding cooperation between the first inclined surface structure (13) and the second inclined surface structure (19).

2. The pipe fitting internal support clamp according to claim 1, characterized in that, The telescopic block (14) has an outer clamp (16) detachably fixed on the side away from the axis of the main shaft (10).

3. The pipe fitting internal support clamp according to claim 2, characterized in that, The telescopic block (14) is provided with a first bolt groove (15), and the outer clamp (16) is provided with a second bolt groove (17) corresponding to the first bolt groove (15). The telescopic block (14) and the outer clamp (16) are fixed by bolt connection.

4. The pipe fitting internal support clamp according to claim 1, characterized in that, The telescopic block (14) is provided with a retaining ring groove (23), and a ring retaining ring is installed in the retaining ring groove (23) and sleeved on the outside of all the telescopic blocks (14).

5. The pipe fitting internal support clamp according to claim 1, characterized in that, On the main shaft (10), on both sides of the sliding cavity (22), there are annular stops (18) fixed by bolts.

6. The pipe fitting internal support clamp according to claim 1, characterized in that, One end of the main shaft (10) is fixed with a dust cover (20) for sealing the hollow cavity (12).

7. The pipe fitting internal support clamp according to claim 1, characterized in that, A flange (21) for connecting to external equipment is fixed on the outer circumferential surface of the main shaft (10).

8. The pipe fitting internal support clamp according to claim 5, characterized in that, The stop block (18) is fixed with a limit block (24) on one side facing the telescopic block (14), and a limit groove (25) is opened on both axial sides of the telescopic block (14), and the limit block (24) is inserted into the limit groove (25).

9. The pipe fitting internal support clamp according to claim 2, characterized in that, The sliding cavity (22) is provided with four cavities, which are evenly distributed in a circle with the axis of the main shaft (10) as the center.

10. The pipe fitting internal support clamp according to claim 9, characterized in that, The sliding cavity (22) is provided in two sets, with four in each set. The two sets of sliding cavities (22) are distributed at different axial positions on the outer periphery of the main shaft (10). The corresponding telescopic block (14) and the outer clamping piece (16) are also provided in two sets to form a double clamping assembly.

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