Internal expanding clamping jig

Abstract

The utility model relates to an internal expanding clamping jig which comprises a jig base and further comprises a first clamping part, a second clamping part, a first supporting part, a second supporting part, a second supporting part and a third supporting part, and the first clamping part is detachably connected to the top of the jig base in a screwed mode; the first driving source is rotatably arranged on one side of the jig base and used for providing clamping power; the second clamping parts are movably arranged on the jig base, and the adjacent second clamping parts are symmetrically arranged on the two sides of the first clamping part; the first driving source can drive the adjacent second clamping parts to be synchronously close to or away from each other. The clamp can be widely applied to various occasions where the interior of a workpiece needs to be operated or machined, such as pipe fitting machining and shaft part inner hole machining, it is guaranteed that the workpiece is kept at a stable position and in a proper clamping state in the machining process, and the machining precision and efficiency are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical processing auxiliary frock technical field, especially a kind of inside prop open clamping fixture. BACKGROUND

[0002] In the machining process, for some workpieces with internal hole structure or needing to be processed and detected from inside, the traditional clamping method is often difficult to meet the requirements. For example, using external clamping fixture may cause deformation of the internal hole of the workpiece, affecting the machining accuracy. While the ordinary inside prop clamping fixture may have uneven clamping force and inaccurate positioning during clamping, which can easily cause displacement or shaking of the workpiece during machining, thereby affecting the product quality. In addition, the traditional clamping fixture has poor versatility, and different clamping fixtures need to be replaced for workpieces of different sizes or shapes, increasing production cost and machining time.

[0003] Therefore, a new type of inside prop open clamping fixture is developed and designed, which can effectively solve the above problems and has important practical significance. SUMMARY

[0004] The utility model aims at providing a fixture for inside prop open clamping of specific workpieces, which can be widely used in various occasions requiring operation or machining on the inside of workpieces, such as pipe machining and internal hole machining of shaft parts, to ensure stable position and appropriate clamping state of workpieces during machining, improve machining accuracy and efficiency, and solve the above technical problems.

[0005] To achieve the above technical solutions, the technical scheme of the utility model is as follows: an inside prop open clamping fixture mainly consists of a fixture base, a first clamping part, a first driving source and a second clamping part. The fixture base serves as the basic support structure of the whole fixture, providing a stable mounting platform for other components. The first clamping part is detachably screwed on the top of the fixture base, and its position is relatively fixed, which can preliminarily position and support one end of the workpiece. The first driving source is rotatably arranged on one side of the fixture base, and is a key component for providing clamping power. The second clamping part is movably arranged on the fixture base and symmetrically distributed on both sides of the first clamping part. Under the drive of the first driving source, it can move closer or farther away synchronously, realizing the prop open clamping action on the inside of the workpiece.

[0006] Further, the first driving source is selected as a servo motor, which has precise speed control and torque output capability. The servo motor is fixed on one side of the jig base by fastening bolts, and its output shaft extends to the inside of the jig base and is in transmission connection with the screw rod assembly. This connection mode can convert the rotary motion of the servo motor into linear motion of the screw rod assembly, thereby providing power for the movement of the second clamping part. The precise control characteristics of the servo motor enable the clamping force to be accurately adjusted according to the actual requirements of the workpiece, ensuring the stability and reliability of clamping.

[0007] Further, the jig base is designed as a hollow shell structure, which not only reduces the overall weight, but also provides space for the installation and movement of internal components. An elongated moving groove is provided on the jig base in an inclined manner. The inclination angle and length of the moving groove are designed according to the movement trajectory and stroke requirements of the second clamping part. The second clamping part is in sliding connection with the jig base through the moving groove, which guides and limits the movement of the second clamping part, ensuring that the second clamping part maintains a stable posture during movement and accurately performs the opening and clamping action on the workpiece.

[0008] Further, the second clamping part includes a moving bracket and a pressing rod. The moving bracket is slidably arranged on the inside of the jig base, and one end thereof is fixedly connected with the shaft sleeve on the screw rod assembly. When the screw rod assembly rotates under the drive of the servo motor, the shaft sleeve drives the moving bracket to move along the axis direction of the screw rod. The moving bracket is provided with a driving groove and symmetrical guide grooves. The driving groove is used for installing the pressing rod, and the width of the guide groove is much smaller than that of the driving groove. The guide grooves accurately guide the movement of the pressing rod and prevent the pressing rod from deviating or shaking during movement. The pressing rod is fixedly provided with a guide seat at one end, which cooperates with the guide grooves to enable the pressing rod to move up and down smoothly in the driving groove, thereby realizing the opening action on the inside of the workpiece.

[0009] Further, the first clamping part is provided with an extrusion ring, which is designed according to the shape of the end of the workpiece and can tightly fit the end of the workpiece. When the workpiece is placed on the jig, the extrusion ring of the first clamping part preliminarily positions and supports one end of the workpiece, and when the second clamping part opens and clamps the inside of the workpiece, the extrusion ring can prevent the end of the workpiece from deforming, ensuring the clamping stability of the whole workpiece.

[0010] Compared with the prior art, the utility model has the following beneficial effects:

[0011] 1) The second clamping parts are symmetrically arranged on both sides of the first clamping part and can synchronously move closer or further away under the drive of the first driving source. This symmetrical structure allows the clamping force to be evenly distributed inside the workpiece, effectively avoiding workpiece deformation or displacement caused by uneven clamping force. For example, when clamping a pipe with internal expansion, the symmetrical second clamping parts apply the same pressure to the inner wall of the pipe from both sides, ensuring that the pipe maintains a stable circular cross-section during processing and improving machining accuracy. The synchronous movement characteristic ensures that the workpiece remains in the center position during clamping and does not shift. This is particularly important for workpieces requiring high-precision machining, such as the machining of inner holes in shaft parts, ensuring the relative positional accuracy between the machining tool and the inner hole of the workpiece and improving machining quality.

[0012] 2) The primary drive source is a servo motor, which possesses precise speed control and torque output capabilities. Through a transmission connection with the lead screw assembly, the motor's rotational motion is converted into linear motion of the second clamping part, achieving high-precision position control. When clamping workpieces of different sizes, the servo motor can precisely adjust the movement distance of the second clamping part according to a preset program, ensuring the clamping force is just right. For example, for thin-walled workpieces, by precisely controlling the output torque of the servo motor and the opening degree of the second clamping part, reliable clamping can be achieved without damaging the workpiece due to excessive clamping force. The lead screw assembly's transmission method has high transmission efficiency and stability, stably transmitting the power of the servo motor to the second clamping part, reducing energy loss and fluctuations during power transmission. This makes the movement of the second clamping part smoother, further improving clamping stability.

[0013] 3) The first clamping part is detachably screwed onto the top of the fixture base. This design facilitates replacement or adjustment according to the shape and size of different workpieces. For example, when machining workpieces with different end shapes, the first clamping part with a corresponding extrusion ring can be replaced, allowing the fixture to better adapt to the clamping requirements of various workpieces and improving its versatility. The screw-on connection makes the installation and removal of the first clamping part simple and quick, requiring no complex tools or operations, reducing maintenance costs and replacement difficulty. During production, if the first clamping part is damaged or needs to be replaced with a different specification part, the operation can be carried out quickly, reducing downtime and improving production efficiency.

[0014] 4) The fixture base is a hollow shell, with internal space to accommodate transmission components such as the lead screw assembly, making the fixture structure more compact. Simultaneously, the inclined elongated moving groove on the fixture base provides guidance and limitation for the movement of the second clamping part. This design allows for the internal clamping of workpieces of various sizes by adjusting the position of the second clamping part within the moving groove, adapting to the processing requirements of different workpieces. For example, for longer pipes, the second clamping part can be adjusted to a suitable position within the moving groove, enabling clamping at an appropriate location inside the pipe, thus accommodating different workpiece processing requirements. The moving bracket of the second clamping part is fixedly connected to the lead screw assembly bushing, and the pressure rod can move on the moving bracket. This structural design allows the second clamping part to adaptively adjust according to the shape and size of the workpiece's inner hole. The guide seat at one end of the pressure rod cooperates with the guide groove on the moving bracket, ensuring the stability and accuracy of the pressure rod during movement. Whether the inner hole of the workpiece is round, square, or other shapes, the second clamping part can effectively clamp it by adjusting the pressure rod, improving the fixture's adaptability to workpieces of different shapes.

[0015] 5) The fixture has a reasonable overall structural design, with close cooperation between its components. The first clamping part, the first drive source, the second clamping part, and the fixture base together form an organic whole, working collaboratively during clamping to achieve efficient internal opening clamping. For example, when clamping a workpiece, the first clamping part positions one end of the workpiece, the first drive source drives the second clamping part to move synchronously, and the fixture base provides stable support for the entire clamping process. The coordinated cooperation between the components makes the clamping process smoother and more efficient. The movable design of the pressure bar of the second clamping part on the moving bracket facilitates the loading and unloading of workpieces. When clamping a workpiece, the pressure bar can be adjusted to a suitable position first, making it easy to place the workpiece into the fixture before the opening clamping action is performed. When unloading a workpiece, the pressure bar can retract, allowing the workpiece to be easily removed, improving the convenience of operation. Attached Figure Description

[0016] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0017] Fig. 1 A 3D drawing of the internally supported clamping fixture;

[0018] Fig. 2 This is a schematic diagram of the negative axis side of the internal support clamping fixture. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Please see the appendix Figs. 1-2 As shown: An internally expanding clamping fixture includes a fixture base 1, and the internally expanding clamping fixture further includes:

[0022] The first clamping part 2 is detachably screwed onto the top of the fixture base 1;

[0023] The first drive source 3 is rotatably mounted on one side of the fixture base 1 to provide clamping power; and

[0024] The second clamping part 4 is movably disposed on the fixture base 1, and adjacent to the second clamping part 4 are symmetrically disposed on both sides of the first clamping part 2; the first driving source 3 can drive the adjacent second clamping parts 4 to move closer or further away synchronously.

[0025] Based on the above embodiments, the first driving source 3 is a servo motor; the servo motor is fixed to one side of the fixture base 1 by fastening bolts and the output shaft extends to the inside of the fixture base 1; the output end of the servo motor is connected to a lead screw assembly; the lead screw assembly is rotatably disposed inside the fixture base 1.

[0026] Based on the above embodiments, the fixture base 1 is a hollow shell; the fixture base 1 is provided with an inclined through-strip-shaped moving groove 11; the second clamping part 4 is slidably disposed in the moving groove 11.

[0027] Based on the above embodiments, the second clamping part 4 includes a movable bracket 41 that is slidably disposed inside the fixture base 1; one end of the movable bracket 41 is fixedly connected to the bushing on the lead screw assembly; and a pressure rod 42 is movably disposed on the movable bracket 41.

[0028] Based on the above embodiments, the movable support 41 is provided with a drive groove; guide grooves are symmetrically provided on both sides of the drive groove; the width of the guide groove is much smaller than the width of the drive groove;

[0029] One end of the pressure rod 42 is fixed with a guide seat.

[0030] Based on the above embodiments, the first clamping part 2 is provided with a compression ring.

[0031] Before using the internal clamping fixture to clamp the workpiece, perform a comprehensive inspection of the fixture. Check that the power and control cables of the servo motor are connected properly and that the motor operates normally; check that the lead screw assembly rotates freely without any jamming or abnormal noise; check that the moving bracket of the second clamping part slides smoothly in the moving groove and that the pressure rod moves smoothly in the drive groove; check that the compression ring of the first clamping part is undamaged or deformed and that it fits well with the end of the workpiece. After ensuring that the fixture is in good working condition, adjust the screw position of the first clamping part on the top of the fixture base according to the size and shape of the workpiece to accurately position and support one end of the workpiece. When clamping the workpiece, place the workpiece to be processed or inspected on the fixture, ensuring that one end of the workpiece is in close contact with the compression ring of the first clamping part. Start the servo motor and set the servo motor's speed, torque, and rotation direction parameters through the control system according to the material, size, and processing requirements of the workpiece. The servo motor drives the lead screw assembly to rotate, causing the moving bracket of the second clamping part to move along the moving groove into the workpiece. During movement, the pressure bar remains vertically stable under the action of the guide groove and guide seat, gradually expanding the interior of the workpiece. Through precise control of the servo motor, the second clamping part synchronously and uniformly expands and clamps the interior of the workpiece, ensuring that the workpiece does not shift or wobble during processing. After clamping, the workpiece can be processed or inspected. After processing or inspection, the servo motor is reversed to retract the second clamping part from the workpiece, and then the workpiece is removed, ready for the next workpiece clamping operation.

[0032] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention.

[0033] Any person skilled in the art should be able to make equivalent embodiments by making some changes or modifications to the above-disclosed technical content without departing from the scope of the technical solution of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the technical solution of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. An internally supported clamping fixture, comprising a fixture base (1), characterized in that, The internal support clamping fixture also includes: The first clamping part (2) is detachably screwed onto the top of the fixture base (1); A first drive source (3), rotatably mounted on one side of the fixture base (1), is used to provide clamping power; and The second clamping part (4) is movably disposed on the fixture base (1), and the adjacent second clamping parts (4) are symmetrically disposed on both sides of the first clamping part (2); the first driving source (3) can drive the adjacent second clamping parts (4) to move closer or further away synchronously.

2. The internally expanding clamping fixture as described in claim 1, characterized in that: The first driving source (3) is a servo motor; the servo motor is fixed to one side of the fixture base (1) by fastening bolts and the output shaft extends to the inside of the fixture base (1); the output end of the servo motor is connected to a lead screw assembly; the lead screw assembly is rotatably disposed inside the fixture base (1).

3. The internally expanding clamping fixture as described in claim 2, characterized in that: The fixture base (1) is a hollow shell; a through-strip moving groove (11) is provided on the fixture base (1); the second clamping part (4) is slidably disposed in the moving groove (11).

4. The internally expanding clamping fixture as described in claim 3, characterized in that: The second clamping part (4) includes a movable bracket (41) slidably disposed inside the fixture base (1); one end of the movable bracket (41) is fixedly connected to the bushing on the lead screw assembly; a pressure rod (42) is movably disposed on the movable bracket (41).

5. The internally expanding clamping fixture as described in claim 4, characterized in that: The movable support (41) is provided with a drive groove; guide grooves are symmetrically provided on both sides of the drive groove; the width of the guide groove is much smaller than the width of the drive groove; One end of the pressure rod (42) is fixed with a guide seat.

6. The internally expanding clamping fixture as described in claim 1, characterized in that: The first clamping part (2) is provided with a compression ring.

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