Inner hole tensioning supporting structure

Abstract

The utility model provides an inner hole tensioning supporting structure which comprises a vertical mandrel, the upper end of the mandrel is provided with a coaxial tensioning shaft, the outer diameter of the tensioning shaft is smaller than that of the mandrel, the tensioning shaft is sequentially sleeved with a rubber sealing ring and a pressing ring from bottom to top, the upper end of the pressing ring is higher than the tensioning shaft, and the upper end of the pressing ring is provided with a pressing plate. A bolt is arranged on the pressing plate and penetrates through the pressing plate to be in threaded connection with the tensioning shaft. The flexible supporting device is of a flexible supporting structure, supporting and positioning of an inner hole of a workpiece can be achieved, the workpiece is not damaged, and machining of the end face of the workpiece is not affected.

Description

Technical Field

[0001] This utility model relates to the field of internal hole support technology, and in particular to an internal hole tensioning support structure. Background Technology

[0002] In the machining process of product components, for some parts with center holes, the center hole is often used for internal hole support and positioning to ensure the coaxiality of the product when machining the product's shape and end face dimensions. Currently, the commonly used methods for internal hole support positioning are cylindrical mandrel positioning and internal support fixture positioning. These methods may affect the end face machining, or the support part often uses a rigid structure, which can easily damage or deform the workpiece when used for parts made of low-strength materials (such as polyurethane foam). Utility Model Content

[0003] This utility model proposes an internal hole tensioning support structure, which is a flexible support structure that can achieve support and positioning of the workpiece's internal hole without damaging the workpiece or affecting the processing of the workpiece's end face.

[0004] The technical solution of this utility model is implemented as follows: an internal hole tensioning support structure includes a vertical mandrel, a coaxial tensioning shaft is provided at the upper end of the mandrel, the outer diameter of the tensioning shaft is smaller than the outer diameter of the mandrel, a rubber sealing ring and a pressure ring are sequentially fitted on the tensioning shaft from bottom to top, the upper end of the pressure ring is higher than the tensioning shaft, a pressure plate is provided at the upper end of the pressure ring, a bolt is provided on the pressure plate, and the bolt passes through the pressure plate and is threadedly connected to the tensioning shaft.

[0005] Furthermore, the outer diameters of the mandrel, pressure ring, and pressure plate are all smaller than the inner diameter of the inner hole.

[0006] Furthermore, a positioning plate is provided at the lower end of the mandrel. The positioning plate is perpendicular to the mandrel, and the outer diameter of the positioning plate is larger than the inner diameter of the inner hole.

[0007] Furthermore, the mandrel and tensioning shaft are integrated into one structure.

[0008] Furthermore, a washer is provided between the bolt head and the pressure plate.

[0009] The beneficial effects of this utility model are:

[0010] This invention features a simple and reliable structure, effectively solving the problems of easy damage and deformation of inner hole supports in low-strength materials, as well as difficulties in machining the end faces. By adjusting the bolt preload, pressure is applied to the pressure plate, causing the rubber sealing ring to expand and generate supporting force, thus achieving the clamping of the workpiece's inner hole. Friction is then used to push the workpiece towards the positioning plate. During the clamping process, the rigid mandrel of the device does not directly contact the workpiece's inner hole; instead, the radial tension force of the rubber sealing ring and the axial friction force achieve the workpiece's support and positioning, protecting the workpiece's inner surface. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] 1. Mandrel, 2. Tensioning shaft, 3. Rubber sealing ring, 4. Pressure ring, 5. Pressure plate, 6. Bolt, 7. Gasket, 8. Positioning plate, 9. Workpiece. Detailed Implementation

[0014] 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.

[0015] like Figure 1 As shown, an internal hole tensioning support structure includes a vertical mandrel 1, and a coaxial tensioning shaft 2 is provided at the upper end of the mandrel 1. The mandrel 1 and the tensioning shaft 2 are an integral structure. The outer diameter of the tensioning shaft 2 is smaller than the outer diameter of the mandrel 1. A rubber sealing ring 3 and a pressure ring 4 are sequentially fitted on the tensioning shaft 2 from bottom to top. The rubber used in the rubber sealing ring 3 has a lower hardness than the workpiece 9.

[0016] The upper end of the pressure ring 4 is higher than the tensioning shaft 2. A pressure plate 5 is placed on the upper end of the pressure ring 4. A bolt 6 is provided on the pressure plate 5. A washer 7 is placed between the bolt head of the bolt 6 and the pressure plate 5. The bolt 6 passes through the washer 7 and the pressure plate 5 and is threadedly connected to the tensioning shaft 2. The outer diameters of the mandrel 1, the pressure ring 4, and the pressure plate 5 are all slightly smaller than the inner diameter of the inner hole of the workpiece 9. A positioning plate 8 is fixed to the lower end of the mandrel 1. The positioning plate 8 is set perpendicular to the mandrel 1, and the outer diameter of the positioning plate 8 is larger than the inner diameter of the inner hole of the workpiece 9.

[0017] A method for using an internal hole tensioning support structure: Loosen bolt 6, pass the inner hole of workpiece 9 through mandrel 1, and after the lower end of workpiece 9 is pressed against positioning plate 8, tighten bolt 6. Bolt 6 drives pressure plate 5 and pressure ring 4 to move downward, compressing and deforming rubber sealing ring 3, generating tension force to press workpiece 9 against it, and using friction to push workpiece 9 against positioning plate 8. Because rubber sealing ring 3 is used, the hardness of the rubber material is lower than that of workpiece 9, so workpiece 9 is less likely to be damaged or deformed when compressed by rubber sealing ring 3, thus protecting workpiece 9. The lower end of mandrel 1 can be connected to the chuck of a machine tool.

[0018] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An internal hole tensioning support structure, characterized in that: It includes a vertical mandrel, with a coaxial tensioning shaft at the upper end of the mandrel. The outer diameter of the tensioning shaft is smaller than that of the mandrel. A rubber sealing ring and a pressure ring are sequentially fitted on the tensioning shaft from bottom to top. The upper end of the pressure ring is higher than the tensioning shaft. A pressure plate is provided at the upper end of the pressure ring. Bolts are provided on the pressure plate and are threadedly connected to the tensioning shaft through the pressure plate.

2. The internal hole tensioning support structure according to claim 1, characterized in that: The outer diameters of the mandrel, pressure ring, and pressure plate are all smaller than the inner diameter of the inner hole.

3. The internal hole tensioning support structure according to claim 1 or 2, characterized in that: A positioning plate is provided at the lower end of the mandrel. The positioning plate is set perpendicular to the mandrel, and the outer diameter of the positioning plate is larger than the inner diameter of the inner hole.

4. The internal hole tensioning support structure according to claim 1, characterized in that: The mandrel and tensioning shaft are integrated into one structure.

5. The internal hole tensioning support structure according to claim 1, characterized in that: A washer is placed between the bolt head and the pressure plate.

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