External supporting self-locking clamp

Abstract

The utility model belongs to the technical field of mechanical clamps, and particularly discloses an external supporting self-locking clamp which comprises a self-locking mechanism and a connecting rod mechanism, the self-locking mechanism comprises a fixing pipe and a center supporting rod, the polished rod end of the center supporting rod is arranged in the fixing pipe in a penetrating mode and makes sliding contact with the inner wall of the fixing pipe, and the threaded rod end of the center supporting rod is in threaded connection with a flange nut. The connecting rod mechanism comprises a plurality of connecting rod supporting seats, side connecting rods are hinged to the left end and the right end of each connecting rod supporting seat respectively, and the other ends of the side connecting rods are hinged to the left end fixed ring or the right end movable ring respectively. The flange nut can drive the center supporting rod to move left and right along a straight line, the center supporting rod drives the equal-height screw and the right-end movable ring to slide along the sliding groove while moving, external supporting, contraction and position locking of the clamp are achieved, the clamp can keep the external supporting force unchanged for a long time, the outer diameter of the clamp can be adjusted, and the clamp is convenient to use. And the device is suitable for to-be-processed pipe fittings with different specifications.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical clamping technology, and specifically discloses an external support self-locking clamp. Background Technology

[0002] When milling thin-walled tubular parts, the thin wall thickness and insufficient overall support cause vibration during machining, leading to poor machining results. Therefore, a fixture capable of external support and locking is needed. Existing technology uses a hollow profile air pipe, sealed at both ends and equipped with inlet and outlet logic valves. Several inlet-type threaded cylinders are evenly spaced along the circumference of the air pipe. The bottom of each inlet-type threaded cylinder is connected to the air passage of the hollow profile via a threaded connection, and the top of the cylinder rod serves as a support. When using the rubber on the inner wall of the tube, place this clamp inside the thin-walled tube part where support is needed, align it with the inlet and outlet logic valves to inflate and pressurize the hollow profile. As the pressure rises, the threaded cylinder connected to the hollow profile extends, and the rubber at the top of the cylinder rod makes tight contact with the inner wall of the thin-walled tube part until the air pressure reaches the predetermined requirement. Inflation ends, and the cylinder completes the internal support action of the thin-walled tube part. After use, vent the air through the inlet and outlet logic valves, the cylinder loses pressure, and the cylinder rod automatically retracts, completing the recycling.

[0003] Existing external support fixtures are pneumatically expanded, requiring excellent airtightness. However, in actual use, these fixtures need to be moved between various workstations. Due to the harsh operating environment, gas leakage in the air pipes is unavoidable, and the air pressure in the pipes decreases over time, making it difficult to maintain a stable external support force and failing to meet the requirements for stable support. Furthermore, existing external support fixtures are limited by air source pressure and cylinder model, making them unable to meet the needs of machining circular workpieces requiring a large external expansion support force. Summary of the Invention

[0004] To address the problems in the background art, this utility model discloses an external support self-locking fixture, including a linkage mechanism and a self-locking mechanism. The self-locking mechanism and the linkage mechanism work together to realize the external support, contraction and self-locking of the fixture, which can provide a stable and large external expansion support force to meet the needs of processing circular workpieces of different specifications.

[0005] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0006] An external support self-locking clamp includes a linkage mechanism and a self-locking mechanism. The self-locking mechanism includes a horizontally arranged fixed tube and a central support rod. The fixed tube is a hollow tube. The left end of the central support rod is a smooth rod, and the right end of the central support rod is a threaded rod. The smooth rod end of the central support rod passes through the fixed tube and slides in contact with the inner wall of the fixed tube. A flange nut is threadedly connected to the threaded rod end of the central support rod. A flange nut retaining ring is fixedly connected to the right end of the fixed tube. The flange nut retaining ring is provided with a limiting groove for limiting the axial displacement of the flange nut. A retaining edge matching the limiting groove is provided on the flange nut.

[0007] The linkage mechanism includes several linkage support seats arranged parallel to the fixed tube. The linkage support seats are spaced apart circumferentially along the fixed tube. Side connecting rods are hinged to the left and right ends of the linkage support seats respectively. A tension spring is provided between the left and right side connecting rods of the same linkage support seat. The other end of the side connecting rod is hinged to the left fixed ring or the right moving ring respectively. The left fixed ring is fixedly connected to the left end of the fixed tube. The right moving ring is sleeved on the fixed tube and slides in contact with the outer wall of the fixed tube. A height equalizing screw is connected to the right moving ring. A sliding groove matching the height equalizing screw is provided on the outer circular surface of the right end of the fixed tube. The sliding groove extends along the axial direction of the fixed tube. The height equalizing screw passes through the sliding groove and is fixedly connected to the middle of the central support rod.

[0008] When the flange nut rotates relative to the flange nut retaining ring, the flange nut can drive the central support rod to move left and right along a straight line. While the central support rod moves, it also drives the equal-height screw and the right-end moving ring to slide along the slide groove. The self-locking mechanism and the linkage mechanism work together to realize the external support, retraction and self-locking of the fixture.

[0009] Furthermore, the external support self-locking clamp is provided with supporting rubber on the outside of the connecting rod support seat.

[0010] Furthermore, the external support self-locking clamp has a movable ring sleeved on the right end of the fixed tube. The movable ring is movably connected to the fixed tube, and the outer diameter of the movable ring is larger than the inner diameter of the right end movable ring.

[0011] Furthermore, in the external self-locking clamp, the axial length of the threaded central support rod is greater than the axial length of the slide groove.

[0012] Furthermore, the external support self-locking clamp has two fixing rings spaced apart at the left end of the fixing tube, with the left-end fixing ring embedded between the two fixing rings, and the left-end fixing ring is fixedly connected to the fixing rings and the fixing tube.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This utility model of an external support self-locking clamp includes a linkage mechanism and a self-locking mechanism. The self-locking mechanism includes a horizontally arranged fixed tube and a central support rod. The smooth end of the central support rod passes through the fixed tube and slides in contact with the inner wall of the fixed tube. A flange nut is threadedly connected to the threaded end of the central support rod. A flange nut retaining ring is fixedly connected to the right end of the fixed tube. The flange nut retaining ring has a limiting groove for limiting the axial displacement of the flange nut. The central support rod is locked by the flange nut thread. This utility model of an external support self-locking clamp can maintain a constant external support force for a long time, prevent the clamping force from decreasing due to gas leakage, and maintain stable processing performance.

[0015] The linkage mechanism includes several linkage support seats arranged parallel to the fixed tube. The linkage support seats are spaced apart circumferentially along the fixed tube. Side connecting rods are hinged to the left and right ends of the linkage support seats respectively. The other end of the side connecting rods is hinged to the left fixed ring or the right moving ring respectively. The left fixed ring is fixedly connected to the left end of the fixed tube. The right moving ring is sleeved on the fixed tube and slides in contact with the outer wall of the fixed tube. A height equalizing screw is connected to the right moving ring. A sliding groove matching the height equalizing screw is provided on the outer circular surface of the right end of the fixed tube. The sliding groove extends along the axial direction of the fixed tube. The height equalizing screw passes through the sliding groove and is fixedly connected to the middle of the central support rod. The linkage mechanism greatly enhances the external support force of the fixture, improves the processing efficiency of the outer wall features of the pipe to be processed, and the outer diameter of the fixture can be automatically adjusted according to the inner diameter of the pipe wall to be processed, which is suitable for pipes of different specifications. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the external support self-locking clamp of this utility model;

[0017] Figure 2 yes Figure 1 Schematic diagram of the sectional structure of the middle AA section;

[0018] Figure 3 This is a three-dimensional structural diagram of the connecting rod structure in this utility model;

[0019] Figure 4 This is a three-dimensional structural diagram of the self-locking mechanism in this utility model;

[0020] In the above figure: 1-Linkage mechanism; 11-Left end fixed ring; 12-Side link; 13-Linkage support seat; 14-Support rubber; 15-Tension spring; 16-Equal height screw; 17-Right end moving ring; 2-Self-locking mechanism; 21-Fixing tube; 22-Flange nut fixing ring; 23-Flange nut; 24-Central support rod; 25-Fixing ring; 26-Moving ring; 3-Slide groove. Detailed Implementation

[0021] To better understand this utility model, the following embodiments further illustrate the content of this utility model, but the content of this utility model is not limited to the following embodiments.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and 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. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0024] Combined with appendix Figure 1-4 This invention provides a detailed description of an external self-locking clamp, comprising a linkage mechanism 1 and a self-locking mechanism 2. The self-locking mechanism 2 includes a horizontally arranged fixed tube 21 and a central support rod 24. The fixed tube 21 is a hollow tube. The left end of the central support rod 24 is a smooth rod, and the right end of the central support rod 24 is a threaded rod. The threaded end of the central support rod 24 extends to the outside of the fixed tube 21. The smooth end of the central support rod 24 passes through the fixed tube 21 and slides in contact with the inner wall of the fixed tube 21. The threaded end of the central support rod 24 is threadedly connected to a flange nut 23. A flange nut fixing ring 22 is fixedly connected to the right end of the fixed tube 21. The flange nut fixing ring 22 has a limiting groove for limiting the axial displacement of the flange nut 23. The flange nut 23 has a stop edge that matches the limiting groove. Under the limiting action of the flange nut fixing ring 22, the flange nut 23 cannot move axially and can only rotate.

[0025] The linkage mechanism 1 includes several linkage support seats 13 arranged parallel to the fixed tube 21. The linkage support seats 13 are spaced apart circumferentially along the fixed tube 21. Side connecting rods 12 are hinged to the left and right ends of the linkage support seats 13 respectively. Tension springs 15 are arranged between the side connecting rods 12 at the left and right ends of the same linkage support seat 13. The left end of the side connecting rod 12 on the left side of the linkage support seat 13 is hinged to the left fixed ring 11. The right end of the side connecting rod 12 on the right side of the linkage support seat 13 is hinged to the right moving ring 17. The left fixed ring 11 is fixedly connected to the left end of the fixed tube 21. The right moving ring 17 is sleeved on the fixed tube 21 and slides in contact with the outer wall of the fixed tube 21. The 17 is connected to an equal-height screw 16. A sliding groove 3 matching the equal-height screw 16 is provided on the outer circular surface of the right end of the fixed tube 21. The sliding groove 3 extends along the axial direction of the fixed tube 21 and limits the left and right movement of the right end moving ring 17. The equal-height screw 16 passes through the sliding groove 3 and is fixedly connected to the middle of the central support rod 24. The utility model external support self-locking fixture is provided with a linkage mechanism 1. The outer diameter of the fixture can be adjusted according to the diameter of the pipe wall, and the external support force of the fixture is strengthened, improving the processing efficiency of the pipe fitting. A threaded self-locking mechanism 2 is provided to lock the fixture, which can maintain the external support force unchanged for a long time, avoiding the problem of reduced clamping force due to gas leakage in existing fixtures, and maintaining processing stability.

[0026] It should be noted that for threaded screw transmission mechanisms, if the rotational degree of freedom of the screw is fixed—for example, by restricting its rotation through keyways, bearings, or mechanical structures—the rotational motion of the nut will be directly converted into the axial linear motion of the screw, while the screw itself will not rotate. This is a typical "nut rotation → screw linear motion" scenario, commonly seen in transmission designs requiring linear output. In this invention, when the flange nut 23 rotates relative to the flange nut fixing ring 22, the flange nut 23 can drive the central support rod 24 to move linearly left and right. Simultaneously, the central support rod 24 moves, causing the equal-height screw 16 and the right-end moving ring 17 to slide along the slide groove 3. The self-locking mechanism 2 and the linkage mechanism 1 work together to achieve the external support and retraction of the clamp. The specific operation process for retraction and position locking is as follows: When the central support rod 24 moves to the left, the central support rod 24 moves simultaneously, driving the equalizing screw 16 and the right-end moving ring 17 to slide to the left along the slide groove 3. The included angle between the connecting rod support seat 13 and the side connecting rod 12 becomes smaller, and the side connecting rod 12 lifts the connecting rod support seat 13. The radial distance between the connecting rod support seat 13 and the fixed tube 21 increases, realizing the external support of the clamp. When the central support rod 24 moves to the right, the central support rod 24 moves simultaneously, driving the equalizing screw 16 and the right-end moving ring 17 to slide to the right along the slide groove 3. The included angle between the connecting rod support seat 13 and the side connecting rod 12 increases, and the radial distance between the connecting rod support seat 13 and the fixed tube 21 decreases, realizing the retraction of the clamp.

[0027] As an optional design, the external support self-locking clamp is preferably provided with supporting rubber 14 on the outer side of the connecting rod support seat 13. When the external support self-locking clamp of this utility model is used to support the processing of a circular workpiece, the supporting rubber 14 contacts the inner wall of the circular workpiece, avoiding rigid contact between the clamp and the workpiece and protecting the circular workpiece.

[0028] As an optional design, the external support self-locking clamp is preferably provided with a movable ring 26 sleeved on the right end of the fixed tube 21. The movable ring 26 is movably connected to the fixed tube 21. The outer diameter of the movable ring 26 is larger than the inner diameter of the right end movable ring 17. The movable ring 26 can restrict the leftward movement of the right end movable ring 17. During operation, the leftward movement of the right end movable ring 17 can be easily adjusted by adjusting the position of the movable ring 26.

[0029] As an optional design, the external support self-locking clamp is preferred, wherein the axial length of the threaded rod of the central support rod 24 is greater than the axial length of the slide groove 3, and when the central support rod 24 moves to the left along the fixed tube 21 to the maximum displacement, part of the threaded rod at the right end of the central support rod 24 is still exposed outside the fixed tube 21.

[0030] As an optional design, the external support self-locking clamp is preferably provided with two fixing rings 25 spaced apart on the left end of the fixing tube 21, and the left end fixing ring 11 is embedded between the two fixing rings 25, and the left end fixing ring 11 is fixedly connected to the fixing rings 25 and the fixing tube 21.

[0031] The working process of this utility model is as follows:

[0032] In practical use, the fixture of this utility model is placed on the inner side of the pipe wall to be processed, which requires support. The flange nut 23 is turned counterclockwise, causing the central support rod 24 to slide to the left end of the fixed pipe 21. The central support rod 24 drives the equal height screw 16 and the right end moving ring 17 to slide to the left end in the sliding groove 3 of the fixed pipe 21. During the sliding process, the right end moving ring 17 drives the side connecting rod 12 to move, thereby causing the connecting rod support seat 13 and the top support rubber 14 to expand outward. Until the support rubber 14 is in tight contact with the inner wall of the pipe to be processed, the clamp's outward expansion action is completed. The self-locking state of the external support self-locking fixture is achieved through the threaded engagement between the flange nut 23 and the central support rod 24.

[0033] When unlocking, turn the flange nut 23 clockwise to pull the central support rod 24 inside the fixed tube 21 to the right. When the central support rod 24 slides to the right inside the fixed tube 21, it drives the equalizing screw 16 and the right end moving ring 17 to slide towards the flange nut 23 at the same time. The right end moving ring 17 drives the side connecting rod 12 to move. The side connecting rod 12 moves to the right along with the connecting rod support seat 13 and the top support rubber 14 until the equalizing screw 16 moves to the right limit of the slide groove 3 of the fixed tube 21, completing the clamp retraction.

[0034] The above description is only an application implementation of this utility model, but the protection scope of this utility model is not limited thereto and cannot be used to limit the scope of rights of this utility model. Any equivalent changes made according to the technical solution of this utility model should be included within the protection scope of this utility model.

Claims

1. An externally supported self-locking clamp, characterized in that: It includes a linkage mechanism and a self-locking mechanism. The self-locking mechanism includes a horizontally arranged fixed tube and a central support rod. The fixed tube is a hollow tube. The left end of the central support rod is a smooth rod, and the right end of the central support rod is a threaded rod. The smooth end of the central support rod passes through the fixed tube and slides in contact with the inner wall of the fixed tube. The threaded end of the central support rod is threadedly connected to a flange nut. A flange nut retaining ring is fixedly connected to the right end of the fixed tube. The flange nut retaining ring is provided with a limiting groove for limiting the axial displacement of the flange nut. The flange nut is provided with a stop edge that matches the limiting groove. The linkage mechanism includes several linkage support seats arranged parallel to the fixed tube. The linkage support seats are spaced apart circumferentially along the fixed tube. Side connecting rods are hinged to the left and right ends of the linkage support seats respectively. A tension spring is provided between the left and right side connecting rods of the same linkage support seat. The other end of the side connecting rod is hinged to the left fixed ring or the right moving ring respectively. The left fixed ring is fixedly connected to the left end of the fixed tube. The right moving ring is sleeved on the fixed tube and slides in contact with the outer wall of the fixed tube. A height equalizing screw is connected to the right moving ring. A sliding groove matching the height equalizing screw is provided on the outer circular surface of the right end of the fixed tube. The sliding groove extends along the axial direction of the fixed tube. The height equalizing screw passes through the sliding groove and is fixedly connected to the middle of the central support rod.

2. The external support self-locking clamp according to claim 1, characterized in that: Supporting rubber is provided on the outer side of the connecting rod support seat.

3. The external support self-locking clamp according to claim 1 or 2, characterized in that: A movable ring is fitted onto the right end of the fixed pipe. The movable ring is movably connected to the fixed pipe, and the outer diameter of the movable ring is larger than the inner diameter of the movable ring on the right end.

4. The external support self-locking clamp according to claim 3, characterized in that: The axial length of the threaded rod of the center support is greater than the axial length of the groove.

5. The external support self-locking clamp according to claim 3, characterized in that: Two fixing rings are provided at intervals on the left side of the fixed tube. The left fixing ring is embedded between the two fixing rings and is fixedly connected to the fixing rings and the fixed tube.

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