A PCF gauge hook pin mechanism
By designing an eccentric hook locking mechanism that can extend vertically and rotate 360°, the problem of complex pin-face positioning structure in PCF fixtures was solved, enabling easy positioning and clamping of parts, reducing manufacturing costs and improving space utilization.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGLING MOTORS
- Filing Date
- 2025-06-26
- Publication Date
- 2026-06-23
AI Technical Summary
Among existing PCF fixtures, the pin-face positioning structure is complex, has high manufacturing costs, large size, and is not conducive to space utilization, making it difficult to achieve efficient part positioning.
Design an eccentric hook lock mechanism that can extend vertically and rotate 360°, including a positioning pin, a threaded rod hook lock, a hook bolt, and a tightening bolt, which achieves the positioning and clamping of parts through threaded engagement.
It enables easy positioning and clamping of parts, reduces manufacturing costs, simplifies the structure, reduces volume, and improves space utilization.
Smart Images
Figure CN224396874U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of automobile manufacturing, specifically to a PCF inspection tool hook pin mechanism. Background Technology
[0002] Positioning and matching sheet metal parts on the assembly precast concrete frame (PCF) fixture is a crucial method for identifying part dimensional issues, and improving part dimensions through PCF matching activities is also an important way to manufacture high-quality car bodies. Generally, parts are positioned on the fixture using primary and secondary locating pins and additional reference surfaces. However, in certain special cases, such as when the part is small, has a special structure (e.g., a cavity part), or when there are many parts to be matched on the fixture and space is limited, a pin-and-surface method is usually used to position the part, that is, a combination of locating pins and reference surfaces.
[0003] In PCF sheet metal part positioning methods, pin-face positioning, while subject to selection, has become a common positioning method. However, finding a better structure to achieve pin-face positioning remains a worthwhile research topic. Wang Yuexia, Zhao Heng, and others designed a hook-pin structure using a crank-slider mechanism. By cranking the handle, the connecting rod is driven to achieve simultaneous action of the positioning pin and the hook lock; that is, the hook lock tightens when the positioning pin extends and loosens when the positioning pin retracts (Patent No.: CN219840884U). While this structure can achieve the pin-face positioning function, it is complex, has high manufacturing costs, is bulky, and is not conducive to the use of space-efficient PCF assembly inspection fixtures. Utility Model Content
[0004] To solve the above problems, this utility model provides an eccentric hook locking mechanism that can extend vertically and rotate 360° by hollowing out the internal structure of the traditional locating pin. This mechanism simultaneously achieves the positioning and clamping of sheet metal parts. It also boasts advantages such as low design and manufacturing costs, simple structure, easy operation, and small size, and is particularly suitable for positioning parts with pin surfaces in assembly PCF (Precast Concrete Forming) fixtures. The specific technical solution is as follows:
[0005] A PCF fixture hook mechanism comprises a positioning pin, a threaded rod hook lock, a hook bolt, a tightening bolt, and a hanging rod. The positioning pin has a notch milled at its upper center and an eccentrically oriented cylinder hollowed out at an eccentric position inside. The threaded rod hook lock is installed inside the hollowed-out positioning pin and includes a head and a lead screw. The head of the threaded rod hook lock is placed within the notch above the positioning pin, and the lead screw of the threaded rod hook lock passes through the hollowed-out area of the positioning pin to reach the bottom of the positioning pin. A hook bolt is provided on the lead screw of the threaded rod hook lock, and a tightening bolt is provided below the hook bolt. The hanging rod is positioned on the side of the mechanism.
[0006] Furthermore, the tightening bolt engages with the threaded rod hook lock screw section, and the tightening bolt locks the clamping parts through the threaded rod hook lock screw section.
[0007] In use, the hook lock is positioned in the notch above the locating pin in the free state. In the working state, the hook lock is first pushed upwards by the lower lead screw until it is completely above the locating pin surface. Then, it is rotated 180° clockwise to pull the hook lock back into the locating pin notch. Finally, the bolt is tightened clockwise to lock the part. This invention has the advantages of low manufacturing cost, simple structure, easy operation, and small size. It is suitable for positioning the pin surface of parts in PCF assembly fixtures. Attached Figure Description
[0008] Figure 1 This is a schematic diagram of the structure of the utility model.
[0009] Figure label:
[0010] 1-Positioning pin, 2-Threaded rod hook lock, 3-Hook bolt, 4-Tightening bolt, 5-Hanging rod. Detailed Implementation
[0011] 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.
[0012] like Figure 1 As shown, a PCF inspection fixture hook mechanism comprises a positioning pin 1, a threaded rod hook lock 2, a hook bolt 3, a tightening bolt 4, and a hanging rod 5. The positioning pin 1 has a notch milled at its upper center and an eccentrically oriented cylinder hollowed out at an eccentric position inside. The threaded rod hook lock 2 is installed inside the hollowed-out positioning pin. The threaded rod hook lock includes a head and a lead screw. The head of the threaded rod hook lock is placed in the notch above the positioning pin, and the lead screw of the threaded rod hook lock passes through the hollowed-out area of the positioning pin to reach the bottom of the positioning pin. A hook bolt 3 is provided on the lead screw of the threaded rod hook lock, and a tightening bolt 4 is provided below the hook bolt. The hanging rod 5 is located on the side of the mechanism.
[0013] The tightening bolt 4 is threadedly engaged with the threaded rod hook lock screw part, and the tightening bolt 4 locks and presses the parts through the threaded rod hook lock screw part.
[0014] In use, in the free state, the hook lock is placed in the notch above the positioning pin; in the working state, first push the hook lock upwards through the lower lead screw until it is completely above the positioning pin surface, then rotate it 180° clockwise to pull the hook lock back into the positioning pin notch, and finally tighten the bolt by rotating it clockwise to complete the locking of the parts.
[0015] The preferred embodiments of this patent have been described in detail above. However, this patent is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this patent.
Claims
1. A PCF gauge hook mechanism, characterized in that: It comprises a positioning pin, a threaded rod hook lock, a hook bolt, a tightening bolt, and a hanging rod. The positioning pin has a notch milled at its upper center and an eccentric cylinder hollowed out at an eccentric position inside. The threaded rod hook lock is installed inside the hollowed-out positioning pin. The threaded rod hook lock includes a head and a threaded rod part. The head of the threaded rod hook lock is placed in the notch above the positioning pin, and the threaded rod hook lock threaded rod part passes through the hollowed-out area of the positioning pin to reach the bottom of the positioning pin. A hook bolt is set on the threaded rod hook lock threaded rod part, and a tightening bolt is set below the hook bolt. The hanging rod is set on the side of the mechanism.
2. The PCF gauge hook mechanism according to claim 1, characterized in that: The tightening bolt engages with the threaded rod hook lock screw part, and the tightening bolt locks the parts by hooking the threaded rod hook lock screw part.