A flat position measuring fixture for shaft workpieces

Abstract

The utility model discloses a kind of flat position measurement clamps of shaft workpieces, belong to fixture field, the clamp includes C-shaped pedestal, positioning block, base, screw rod and support spring.Positioning block is installed on pedestal by dovetail groove structure, its bottom surface is measurement reference surface.Base is movably connected with positioning block by screw rod, button is equipped in screw rod top, bottom is limited by stud nut and supported by support spring.Top of base is equipped with V-shaped groove to position shaft workpiece, the bottom surface of positioning block is equipped with soft rubber head limiting mechanism driven by reset spring.The utility model realizes the quick clamping and release of workpiece by one-key pressing operation, the accuracy and stability of workpiece positioning are guaranteed using V-shaped groove and elastic limiting mechanism, effectively solve the problem that traditional clamp operation is complicated, fixed unstable leads to flat position surface measurement inaccuracy, especially suitable for batch precision measurement of the flat position of shaft workpiece of fiber optic connector.

Description

Technical Field

[0001] This utility model relates to the field of fixtures, and in particular to a flatness measuring fixture for shaft-type workpieces. Background Technology

[0002] In the field of precision manufacturing and inspection, shaft-type workpieces such as MPO fiber optic connectors are widely used due to their flat surfaces (flat sections) at both ends that require high-precision measurement. Currently, the measurement of these flat sections typically relies on traditional shaft fixtures or general-purpose measurement platforms. However, existing technologies have significant limitations: First, traditional fixtures lack dedicated positioning and clamping mechanisms for the flat structure of such workpieces, relying solely on simple V-blocks or flat-jaw pliers for fixation. This leads to axial movement or circumferential rotation of cylindrical workpieces during measurement, preventing the flat surface from stably and accurately aligning with the measurement reference surface, resulting in poor repeatability and low accuracy of measurement data. Second, the operation process of existing fixtures is often cumbersome, requiring multiple tightening and loosening of bolts for clamping and unclamping the workpiece, which is inefficient and unsuitable for batch inspection needs. Therefore, there is an urgent need for a dedicated measuring fixture that can achieve rapid and stable clamping and ensure high-precision positioning of the flat surface and the reference surface to solve the core problems of inaccurate measurement and inconvenient operation caused by existing technologies. Utility Model Content

[0003] The main purpose of this utility model is to provide a flatness measuring fixture for shaft-type workpieces, which can effectively solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A flatness measuring fixture for shaft-type workpieces includes a C-shaped base. The inner top surface of the C-shaped base is provided with a pair of support springs, and a positioning block is fixedly installed on the top surface of the C-shaped base. A pair of screws are movably installed on the top surface of the positioning block and pass downward through the positioning block. The screws pass through a base and are respectively connected to a convex nut at their ends to fix the position of the base. The bottom of the convex nut extends into the support spring and is held in place by it. A button is installed on the top of the screw. Pressing the button downward will drive the screw to compress the support spring downward, so that the base and the positioning block are separated for placing the workpiece for subsequent measurement.

[0005] Preferably, the inner top surface of the C-shaped base has a pair of bottom holes for placing the support spring, and the top surfaces of both sides of the C-shaped base have dovetail grooves respectively. The bottom surface of the positioning block has an integral dovetail clip at the corresponding position. The dovetail clip is inserted into the dovetail groove, and the positioning block is fixedly installed to the top of the C-shaped base by four fixing bolts.

[0006] Preferably, the surface of the positioning block has a through movable hole, the surface of the base has a through hole, the screw passes through the movable hole and the through hole in sequence, and a pair of convex nuts are connected to the end by threads. The top of the convex nuts abuts against the bottom surface of the base from below, and the bottom of the convex nuts is inserted into the inner ring of the support spring.

[0007] Preferably, the top surface of the base has a longitudinal V-shaped groove for placing the workpiece, the end of the workpiece has a flat surface, and the bottom surface of the positioning block is the reference surface, which is used to press against the flat surface.

[0008] Preferably, a storage groove is installed on the bottom surface of the positioning block above the V-shaped groove. A return spring is fixedly installed in the storage groove. A limiting head is fixedly connected to the other end of the return spring. A soft rubber head is fixedly connected to the head of the limiting head by glue. The soft rubber head is used to abut against the end of the workpiece for limiting.

[0009] Compared with the prior art, the present invention has the following beneficial effects: This invention utilizes a C-shaped base and spring support system to achieve rapid clamping and release of the workpiece. Simultaneously, the design of the V-groove, limiting device, and dovetail groove structure ensures stable workpiece positioning, thereby improving measurement efficiency and accuracy, simplifying the operation process, and guaranteeing the accuracy of the measurement results. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is an exploded view of the overall structure of this utility model; Figure 3 This is a schematic diagram of the positioning block structure of this utility model.

[0011] In the diagram: 1. C-shaped base; 2. Positioning block; 3. Base; 4. Screw; 5. Support spring; 6. V-groove; 7. Fixing bolt; 8. Button; 9. Bottom hole; 10. Dovetail groove; 11. Convex nut; 12. Through hole; 13. Dovetail retaining strip; 14. Limiting head; 15. Soft rubber head; 16. Storage groove; 17. Return spring; 18. Movable hole; 19. Workpiece; 20. Flat surface. Detailed Implementation

[0012] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0013] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. The terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0014] like Figures 1-2 As shown, a flatness measuring fixture for shaft-type workpieces includes a C-shaped base 1. The inner top surface of the C-shaped base 1 has a pair of bottom holes 9 for placing a support spring 5. Dovetail grooves 10 are respectively opened on the top surfaces of the two sides of the C-shaped base 1. The bottom surface of the positioning block 2 has an integral dovetail retaining strip 13 at the corresponding position. The dovetail retaining strip 13 is inserted into the dovetail groove 10. The positioning block 2 is fixedly installed on the top of the C-shaped base 1 by four fixing bolts 7. A through movable hole 18 is opened on the surface of the positioning block 2. A through hole 12 is opened on the surface of the base 3. The screw 4 passes through the movable hole 18 and the through hole 12 in sequence, and a pair of convex head nuts 11 are connected to the end by threads. The top of the convex head nuts 11 abuts against the bottom surface of the base 3 from below, and the bottom of the convex head nuts 11 is inserted into the inner ring of the support spring 5.

[0015] This design, through the cooperation of button 8, screw 4, convex nut 11, and spring 5, achieves a one-button quick opening and closing function for the pressure block, greatly simplifying the clamping and loading process of workpiece 19 and providing convenience for batch measurement. Simultaneously, the stable pressure provided by the support spring 5 ensures that, in the measurement state, the base 3 can reliably press the workpiece onto the reference surface of the positioning block 2 via the screw assembly. Furthermore, the cooperation structure of the dovetail groove 10 and the dovetail retaining strip 13 enables rapid pre-positioning and alignment of the positioning block 2 during installation, ensuring the relative positional accuracy between its reference surface and the base 1. Combined with the fixing bolt 7, a robust connection is formed, effectively preventing displacement due to force during long-term use and ensuring the long-term stability of the measurement reference. The convex nut 11 serves both as a mechanical limiter for the position of the base 3, preventing it from loosening, and its bottom extending into the inner ring of the support spring 5, guiding the spring and preventing bending instability during compression, thus ensuring the linearity of the clamping force transmission and the smoothness of the operation.

[0016] like Figures 2-3As shown, the top surface of the base 3 has a longitudinal V-shaped groove 6 for placing the workpiece 19. The end of the workpiece 19 has a flat surface 20. The bottom surface of the positioning block 2 is the reference surface, used to press against the flat surface 20. A storage groove 16 is installed on the bottom surface of the positioning block 2 above the V-shaped groove 6. A return spring 17 is fixedly installed in the storage groove 16. The other end of the return spring 17 is fixedly connected to a limiting head 14. The head of the limiting head 14 is fixedly connected to a soft rubber head 15 by glue. The soft rubber head 15 is used to press against the end of the workpiece 19 for limiting.

[0017] The V-groove structure can adaptively support and position shaft-type workpieces of different diameters, offering strong versatility. Combined with the reference surface at the bottom of the positioning block 2, it precisely ensures that the flat surface 20 of the workpiece 19 aligns with the reference surface of the positioning block 2 during clamping, providing a stable and reliable measurement reference for the height gauge's parallelism measurement. Simultaneously, the elastic limiting mechanism can pre-limit the end of the workpiece 19, assisting in the quick and accurate placement of the workpiece 19 into the measurement position. The soft rubber head 15 design provides sufficient friction to prevent the workpiece 19 from rolling while avoiding scratches that rigid contact might cause to the surface of the precision workpiece 19.

[0018] In practical use, after placing the fixture, simply press button 8 manually to drive screw 4 downwards. Screw 4 passes through positioning block 2 and base 3, and the convex nut 11 acts on support spring 5, causing support spring 5 to contract. At this time, base 3 also moves downwards, increasing the space between positioning block 2 and base 3. Take workpiece 19 and place it on V-groove 6, then slowly release button 8. Under the elastic force of support spring 5, base 3 rises and returns to its original position. At the same time, adjust the length of workpiece 19 inserted into positioning block 2 until the end of workpiece 19 touches soft rubber head 15, indicating that the position is correct. If the flat surface 20 of workpiece 19 deflects too much and cannot fit with the reference surface of positioning block 2, simply press button 8 slightly to loosen the gap between positioning block 2 and base 3, and then rotate workpiece 19 to adjust. If the deflection angle is slight, under the elastic force of support spring 5, workpiece 19 can be slightly rotated and adjusted by being pressed by base 3 and positioning block 2 until its flat surface 20 completely fits with the reference surface of positioning block 2. Then, parallelism can be measured with a height gauge. Repeating the above process completes batch operations.

[0019] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A flatness measuring fixture for shaft-type workpieces, characterized in that: The system includes a C-shaped base (1), with a pair of support springs (5) on the inner top surface of the C-shaped base (1) and a positioning block (2) fixedly installed on the top surface of the C-shaped base (1). A pair of screws (4) are movably installed on the top surface of the positioning block (2) and pass downward through the positioning block (2). The screws (4) pass through a base (3) and are connected to a nut (11) at the end to fix the position of the base (3). The bottom of the nut (11) extends into the support spring (5) and is held in place by it. A button (8) is installed on the top of the screw (4). Pressing the button (8) downward will drive the screw (4) to compress the support spring (5) downward, so that the base (3) and the positioning block (2) are separated for placing the workpiece (19) for subsequent measurement.

2. The flatness measuring fixture for shaft-type workpieces according to claim 1, characterized in that: The inner top surface of the C-shaped base (1) is provided with a pair of bottom holes (9) to place the support spring (5). The top surfaces of the two sides of the C-shaped base (1) are respectively provided with dovetail grooves (10). The bottom surface of the positioning block (2) is provided with dovetail clips (13) of an integral structure at the corresponding positions. The dovetail clips (13) are inserted into the dovetail grooves (10), and the positioning block (2) is fixedly installed on the top of the C-shaped base (1) by four fixing bolts (7).

3. The flatness measuring fixture for shaft-type workpieces according to claim 2, characterized in that: The surface of the positioning block (2) has a through hole (18), and the surface of the base (3) has a through hole (12). The screw (4) passes through the through hole (18) and the through hole (12) in sequence, and is connected to a pair of convex nuts (11) by thread at the end. The top of the convex nuts (11) abuts against the bottom surface of the base (3) from below, and the bottom of the convex nuts (11) is inserted into the inner ring of the support spring (5).

4. The flatness measuring fixture for shaft-type workpieces according to claim 3, characterized in that: The top surface of the base (3) has a longitudinal V-shaped groove (6) for placing the workpiece (19). The end of the workpiece (19) has a flat surface (20). The bottom surface of the positioning block (2) is the reference surface, which is used to press the flat surface (20) tightly.

5. A flatness measuring fixture for shaft-type workpieces according to claim 4, characterized in that: The bottom surface of the positioning block (2) is equipped with a storage groove (16) located above the V-shaped groove (6). A reset spring (17) is fixedly installed in the storage groove (16). The other end of the reset spring (17) is fixedly connected to a limiting head (14). The head of the limiting head (14) is fixedly connected to a soft rubber head (15) by glue. The soft rubber head (15) is used to abut against the end of the workpiece (19) for limiting.

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