Hexagon Socket Eccentric Locating Pin

Product introduction

The internal hexagonal eccentric positioning pin is a positioning and adjustment component with precise design and unique functions. It cleverly designs the axis line of the cylindrical section and the axis line of the eccentric section to not coincide, forming a precisely calculated fixed eccentricity, thereby achieving micron-level precise position adjustment and reliable locking between workpieces. This product is usually made of high-quality alloy steel and is heat-treated to provide high hardness and wear resistance. Its core function is to rotate the pin body and use the circular motion of the eccentric segment in the connector hole to drive the workpiece matched with it to undergo slight displacements front and back, left and right, effectively compensating for dimensional errors generated during processing and assembly. Ease of operation is another major advantage. Just use the Allen wrench to rotate the pin body, and you can easily and accurately control the adjustment direction and amplitude. After adjusting to the target position, it can be firmly locked by locking nuts or other compression devices, effectively preventing loosening and rebound during use. Internal hexagonal eccentric positioning pins are widely used in high-precision machine tools, automation equipment, mold manufacturing, precision instruments and other fields. In scenarios where it is necessary to eliminate fit gaps, align the axis or accurately calibrate the plane position of parts, it is an ideal solution to achieve efficient and precise assembly, and can significantly improve the assembly accuracy and quality stability of the product.

 

Product features

1. Precision fine-tuning capability: The core feature lies in its unique eccentric design. By rotating the pin body, the accurately calculated eccentricity can be used to easily realize micron-level precise position adjustment of the workpiece in the radial or axial direction, effectively compensating for manufacturing and assembly tolerances.

2. Easy and efficient operation: It adopts a standard internal hexagonal interface and can be operated with a common wrench. The rotation process is smooth and controllable, without the need to disassemble the equipment or use special tools, which greatly improves the efficiency of assembly and debugging.

3. High rigidity and wear resistance: It is usually made of high-quality alloy steel and undergoes heat treatment (such as quenching) and fine grinding. It has high hardness, high strength and excellent wear resistance, which can ensure long-term accuracy under frequent adjustments and vibration environments.

4. Reliable anti-loosening locking: After adjusting to the target position, it can be tightened with the matching lock nut to reliably lock the pin body, prevent loosening or rotation due to vibration during equipment operation, and ensure long-term positioning stability.

5. Compact structure and wide applicability: The design is compact and the precise positioning function can be achieved in a limited space. It is widely used in fields such as high-precision machine tools, automated robots, molds, jigs, and precision transmission mechanisms. It is an ideal component to solve problems such as centering, parallelism, and gap adjustment.

 

Product application

1. High-precision machine tool and equipment manufacturing: spindle and guide rail calibration: used to adjust the installation parallelism, coaxiality and center height of core components such as machine tool spindles and linear guide rails, effectively eliminating assembly gaps and ensuring machining accuracy. Mold installation and alignment: In the installation of large stamping molds and injection molds, fine-tune the precise positions of the upper and lower molds or cavities to achieve perfect centering and mold closing.

 

2. Automation and robotics field: Robotic arm joint adjustment: Used to calibrate the connection position of each joint arm of the robot, compensate for manufacturing tolerances, and optimize repeated positioning accuracy and motion trajectories. Conveyor line positioning: In precision assembly lines or conveyor equipment, adjust the positions of transmission components such as rollers and pulleys to ensure straightness and synchronization of operation.

 

3. Molds and fixtures (tooling): Precision fixture positioning: As an adjustable positioning pin, it is installed on the fixture base and can accurately position the workpiece through fine adjustment. It is especially suitable for rapid changeover of flexible production lines with multiple varieties and small batches. Wear compensation: For positioning holes that have become worn after long-term use, the positioning accuracy can be restored by replacing or adjusting the eccentric pin, extending the service life of the mold or fixture.

 

4. Precision instruments and optical equipment: Optical component alignment: In laser equipment, optical platforms and testing instruments, it is used to finely adjust the center position and optical path angle of optical components such as lenses and reflectors. Equipment base leveling: Used to adjust the height of precision instrument legs to achieve precise horizontal installation of equipment.

 

FAQ

Q: What is the core function of this product?

A: Its core function is precise micron-level position adjustment. It rotates the eccentric pin body and uses its inherent eccentricity to push or pull the mating parts easily and accurately to achieve slight changes in radial position, thereby compensating for manufacturing tolerances, aligning the axis, or adjusting gaps.

 

Q: What does eccentricity represent? How to choose?

A: The eccentricity refers to the radial distance between the center line of the cylindrical section of the pin and the center line of the eccentric section. It is a key parameter for adjustment accuracy: Selection basis: Smaller eccentricity (such as 0.5mm) is suitable for fine-tuning that requires extremely high precision; larger eccentricity (such as 1.0mm or more) provides a larger adjustment range. You need to choose based on the expected tolerance compensation range.

 

Q: What is the operation and adjustment process?

A: The process is very simple::

1. Place the pin into the base hole of the workpiece (usually a tight fit).

2. Use a standard Allen wrench to rotate the pin body.

3. The eccentric part of the pin will cause the upper workpiece to move.

4. Monitor the adjustment amount through measuring tools such as a dial indicator. After reaching the target position, be sure to tighten the matching lock nut to fix the position and prevent subsequent loosening.

 

Q: What are its advantages compared with ordinary direct pins or tapered pins?

A: Ordinary positioning pins only provide fixed positioning functions and cannot be adjusted. On the basis of providing positioning function, the internal hexagonal eccentric positioning pin adds adjustability and can correct errors without reprocessing the positioning holes, which greatly improves the flexibility and final accuracy of assembly and reduces manufacturing and maintenance costs.

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