Wedge type expansion positioning pin

Abstract

The invention discloses an inclined wedge type expansion type positioning pin, and relates to the technical field of clamps for high-precision machining and automation scenarios, the inclined wedge type expansion type positioning pin comprises an external connection block, a shell and an air cylinder, the shell is arranged on the right side of the external connection block, the air cylinder is installed below the shell, an inclined wedge mechanism is installed in the shell, and an oil-free bushing is installed at the top end of the shell; a slotting positioning sleeve is arranged above the shell, an inclined wedge block is arranged on the inner side of the slotting positioning sleeve, the air cylinder provides axial driving force, and the air cylinder drives the inclined wedge mechanism to move along the axis. According to the tapered wedge type expansion positioning pin, the external sleeve is driven by the internal tapered wedge mechanism to generate controllable radial expansion, uniform interference fit is formed between the external sleeve and the precise hole wall of a workpiece or a clamp, micron-level positioning precision is achieved, meanwhile, it is ensured that the clamping state is stable and reliable through the self-locking characteristic of the tapered wedge, and the clamping efficiency and machining consistency are remarkably improved; and the harsh requirements of high-end manufacturing scenes are met.

Description

Technical Field

[0001] This invention relates to the field of fixture technology for high-precision machining and automation scenarios, specifically to a wedge-type expansion positioning pin. Background Technology

[0002] In the context of the large-scale application of non-standard fixtures in the industry, traditional fixture positioning pins generally suffer from technical pain points such as excessive clearance between the fixture and the workpiece, low clamping efficiency, and insufficient positioning consistency, making it difficult to meet the core requirements of modern precision manufacturing for high-precision and high-efficiency positioning.

[0003] Existing technologies typically employ rigid locating pins and ordinary expansion pins, which often use a single conical surface fit or a simple elastic expansion design to achieve positioning through mechanical clamping or primary elastic deformation. This lacks a precise force transmission mechanism and a stable interference fit structure, resulting in limited positioning accuracy and insufficient clamping reliability. Consequently, they cannot meet the stringent requirements of high-end manufacturing scenarios such as CNC machining centers and automated welding lines. Therefore, we propose a wedge-type expansion locating pin to address the aforementioned issues. Summary of the Invention

[0004] The purpose of this invention is to provide a wedge-type expansion positioning pin, which addresses the shortcomings of existing positioning pins such as low positioning accuracy, poor clamping stability, and insufficient adaptability. This invention provides an expansion positioning pin based on the wedge transmission principle, achieving an integrated function of high-precision positioning and firm clamping.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a wedge-type expansion positioning pin, comprising an outer block, a housing, and a cylinder: The outer block has a housing on its right side, and a cylinder is installed below the housing. The housing is equipped with a wedge mechanism inside, an oil-free bushing is installed at the top of the housing, a slotted positioning sleeve is provided on the top of the housing, and a wedge block is provided on the inner side of the slotted positioning sleeve.

[0006] Preferably, the cylinder provides axial driving force, and the cylinder drives the wedge mechanism to move along the axis.

[0007] Preferably, the wedge block adopts a precision taper design.

[0008] Compared with the prior art, the beneficial effects of the present invention are: the inclined wedge expansion positioning pin drives the outer sleeve to generate controllable radial expansion through the internal inclined wedge mechanism, forming a uniform interference fit with the precision hole wall of the workpiece or fixture, achieving micron-level positioning accuracy. At the same time, relying on the self-locking characteristics of the inclined wedge, it ensures a stable and reliable clamping state, significantly improving clamping efficiency and processing consistency, and adapting to the stringent requirements of high-end manufacturing scenarios. 1. The wedge-taper coordinated transmission design achieves efficient conversion of axial force to radial expansion force through precision tapered wedge blocks, ensuring expansion uniformity and positioning accuracy; 2. The slotted positioning sleeve is integrated with the self-locking mechanism. The slotted structure is adapted to the radial expansion requirements. Combined with the self-locking characteristics of the wedge, it realizes the integration of positioning, clamping and self-locking, thus improving stability. 3. Multi-scenario adaptability: The core structure is adapted to high-end manufacturing scenarios such as CNC machining centers, automated welding lines, and high-precision testing fixtures, meeting the stringent requirements for positioning accuracy, stability, and efficiency. Attached Figure Description

[0009] 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 a schematic diagram of the first axial side structure of the present invention; Figure 2 This is a schematic diagram of the second axial side structure of the present invention; Figure 3 This is a front view structural diagram of the present invention.

[0010] In the diagram: 1. External block; 2. Outer shell; 3. Cylinder; 4. Wedge mechanism; 5. Oil-free bushing; 6. Slotted positioning sleeve; 7. Wedge block. Detailed Implementation

[0011] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention, so that the implementation process of how the present application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0012] Please see Figures 1-3 It includes an outer block 1, a housing 2, a cylinder 3, a wedge mechanism 4, an oil-free bushing 5, a slotted positioning sleeve 6, and a wedge block 7; The outer block 1 has a housing 2 on its right side, a cylinder 3 is installed below the housing 2, a wedge mechanism 4 is installed inside the housing 2, an oil-free bushing 5 is installed at the top of the housing 2, a slotted positioning sleeve 6 is installed above the housing 2, and a wedge block 7 is installed inside the slotted positioning sleeve 6. The cylinder 3 provides axial driving force, and the cylinder 3 drives the wedge mechanism 4 to move along the axis. The wedge block 7 adopts a precision taper design. The outer shell 2, cylinder 3, wedge mechanism 4, oil-free bushing 5, slotted positioning sleeve 6 and wedge block 7 work together to achieve a closed-loop function of positioning-expansion-clamping. Cylinder 3 provides axial driving force to drive the wedge mechanism 4 to move along the axis. The wedge block 7 adopts a precision taper design to convert the axial driving force into a uniform radial expansion force. The oil-free bushing 5 ensures smooth transmission and wear resistance of the structure. Radial expansion force acts on the slotted positioning sleeve 6, causing it to expand uniformly in the radial direction, accurately filling the fit gap with the workpiece / fixture hole wall, forming a stable interference fit; By utilizing the tapered self-locking characteristic of the wedge mechanism 4, mechanical self-locking is achieved after expansion clamping is completed. Stable positioning can be maintained without continuous power supply, ensuring no displacement deviation during processing. All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0013] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A wedge-type expansion positioning pin, comprising an outer block (1), a housing (2), and a cylinder (3), characterized in that: The outer block (1) is provided with a housing (2) on the right side, and a cylinder (3) is installed below the housing (2). The shell (2) is equipped with a wedge mechanism (4), an oil-free bushing (5) is installed at the top of the shell (2), a slotted positioning sleeve (6) is provided above the shell (2), and a wedge block (7) is provided on the inner side of the slotted positioning sleeve (6).

2. The wedge-shaped expansion positioning pin according to claim 1, characterized in that: The cylinder (3) provides axial driving force, and the cylinder (3) drives the wedge mechanism (4) to move along the axis.

3. The wedge-shaped expansion positioning pin according to claim 1, characterized in that: The wedge block (7) adopts a precision taper design.

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