A length measuring instrument positioning structure
By introducing a longitudinal lifting longitudinal positioning plate and a toothed meshing structure clamping mechanism into the length measuring instrument, instant positioning is achieved, solving the problem of cumbersome operation of clamping devices in the prior art, improving measurement accuracy and simplifying the operation process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG HAOBO MEASUREMENT CALIBRATION CO LTD
- Filing Date
- 2025-09-16
- Publication Date
- 2026-07-21
AI Technical Summary
The existing length measuring instrument clamping device cannot perform real-time limit positioning during use, which leads to cumbersome operation and affects measurement accuracy and efficiency.
A clamping mechanism including a longitudinally lifting longitudinal positioning plate and a toothed meshing structure is designed. By rotating the handle, the active tooth is driven to rotate, thereby realizing the lifting of the lifting column and the rotation of the screw, achieving instant positioning and simplifying the operation process.
The real-time positioning function simplifies the operation process, enhances clamping stability, avoids workpiece displacement, improves measurement accuracy, and reduces manufacturing costs and maintenance difficulty.
Smart Images
Figure CN224534952U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of length measuring instrument technology, specifically a length measuring instrument positioning structure. Background Technology
[0002] A length measuring instrument is a high-precision optical / mechanical length measuring instrument, mainly used in metrology rooms or precision laboratories to perform absolute and comparative measurements of the dimensions of parts. It utilizes the principle of light wave interference to achieve measurement accuracy at the micrometer or even sub-micrometer level.
[0003] A typical horizontal length measuring instrument usually includes a base and a bed, which provide a solid and stable foundation to reduce deformation and vibration.
[0004] Measuring spindle: Equipped with a measuring mirror, it can be moved precisely, and the amount of movement is the length to be measured.
[0005] Reading system: including interference optical path, photoelectric microscope and counter, used to accurately read the spindle displacement.
[0006] Worktable: Used to place workpieces, it can usually be finely adjusted up and down, left and right, forward and backward, and rotated to ensure that the workpiece is in the correct measurement position.
[0007] Tail tube and measuring cap: The tail tube provides another measuring end point, and the measuring cap is the part that directly contacts the workpiece. It has various shapes such as flat, knife edge and spherical to adapt to different measured elements.
[0008] Various accessories, such as internal measuring hooks, large-range measuring frames, and center frames, are used to expand measurement functions.
[0009] The worktable has up-down, left-right, forward-backward, and rotation adjustment functions, and is also equipped with a positioning mechanism for the workpiece to be measured. Usually, a clamping device is used to effectively fix the workpiece to be measured. However, most existing clamping devices cannot provide real-time limit for movement and stopping during use. That is, during the rotation process, a corresponding stopping structure is required to control the clamping device to stop and move in real time. This increases the complexity of operation and is not conducive to installation and disassembly.
[0010] In view of this, this application designs a length measuring instrument positioning structure. Utility Model Content
[0011] The purpose of this invention is to provide a length measuring instrument positioning structure to solve the problems mentioned in the background art.
[0012] To achieve the above objectives, this utility model provides the following technical solution:
[0013] A length measuring instrument positioning structure includes a bed, a measuring slot, a reading device, and a workpiece adjustment device. The measuring slot is located on one side of the top of the bed. A set of worktables is installed inside the measuring slot through the workpiece adjustment device. The workpiece to be measured is placed on the worktable and positioned by a clamping mechanism. Length measuring devices are provided on both sides of the top of the worktable for measuring the length of the workpiece after it has been positioned on the worktable.
[0014] The clamping mechanism includes a longitudinally lifting positioning plate mounted on one side of the top of the worktable. A connecting block is fixedly installed on the outer end wall of the longitudinal positioning plate. A vertically distributed lifting column is installed in the middle of the bottom of the connecting block via a connecting rod. The outer wall of the lifting column away from the worktable has a toothed groove. One side of the toothed groove is engaged with active teeth distributed perpendicular to the lifting column. The two ends of the active teeth are symmetrically mounted with toothed shafts. One end of the toothed shaft is equipped with a handle, and the other end is equipped with a telescopic connecting rod. The end of the telescopic connecting rod away from the active teeth is connected to a screw in a telescopic and limited rotation manner. That is, when the telescopic connecting rod rotates, it synchronously drives the screw to rotate, and the screw is in a telescopic connection state in the axial direction. The screw is externally threaded with a threaded hole sleeve. By rotating the handle, the active teeth are rotated, thereby controlling the lifting column to rise and fall. At the same time, the telescopic connecting rod rotates synchronously, which drives the screw to rotate inside the threaded hole sleeve and move axially synchronously. The threaded connection between the screw and the threaded hole sleeve provides instant positioning for the rotation of the active teeth, that is, it prevents them from rotating automatically.
[0015] Compared with the prior art, the beneficial effects of this utility model are: by providing an instant positioning function, the operation process is simplified and the cumbersome process of installing and disassembling workpieces is reduced.
[0016] By enhancing clamping stability, workpiece displacement is avoided during measurement, thus improving measurement accuracy.
[0017] The compact design makes it easy to integrate with existing length measuring instruments, reducing manufacturing costs and maintenance difficulties. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of a length measuring instrument positioning structure.
[0019] Figure 2 This is a partial structural diagram of a length measuring instrument positioning structure.
[0020] Figure 3 for Figure 2 A magnified structural diagram of A in the diagram.
[0021] Figure 4 This is a partial structural diagram of the longitudinal positioning plate in a length measuring instrument positioning structure.
[0022] The components include: bed 10, measuring groove 11, reading device 12, worktable 14, longitudinal positioning plate 15, protective pad 16, connecting block 17, lifting column 18, tooth groove 19, driving tooth 20, rotating handle 21, telescopic connecting rod 22, screw 23, positioning key 24, threaded hole sleeve 25, bracket 26, T-shaped slide bar 27, and T-shaped slide rail 28. Detailed Implementation
[0023] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.
[0024] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0026] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.
[0027] Please see Figures 1-4 A length measuring instrument positioning structure includes a bed 10, a measuring slot 11, a reading device 12, and a workpiece adjustment device. The measuring slot 11 is located on one side of the top of the bed 10. A set of worktables 14 is installed inside the measuring slot 11 through the workpiece adjustment device. The workpiece to be measured is placed on the worktables 14 and positioned by a clamping mechanism. Length measuring devices are provided on both sides of the top of the worktables 14 for measuring the length of the workpiece after it has been positioned on the worktables 14.
[0028] The clamping mechanism includes a longitudinally lifting positioning plate 15 mounted on one side of the top of the worktable 14. A connecting block 17 is fixedly installed on the outer end wall of the longitudinally lifting positioning plate 15. A vertically distributed lifting column 18 is mounted on the bottom center of the connecting block 17 via a connecting rod. The outer wall of the lifting column 18 away from the worktable 14 has a toothed groove 19. One side of the toothed groove 19 is engaged with a drive tooth 20 distributed perpendicular to the lifting column 18. The two ends of the drive tooth 20 are symmetrically mounted with toothed shafts. A handle 21 is installed at one end of the toothed shaft, and a telescopic connecting rod 22 is installed at the other end. The telescopic connecting rod 22 is away from the drive tooth 20. The end of the telescopic and rotation-limiting connection is connected to a screw 23, that is, when the telescopic connecting rod 22 rotates, the screw 23 is driven to rotate synchronously, and it is in a telescopic connection state in the axial direction. The screw 23 is externally threaded to a threaded hole sleeve 25. By rotating the handle 21, the driving gear 20 is driven to rotate, thereby controlling the lifting column 18 to rise and fall. At the same time, the telescopic connecting rod 22 rotates synchronously, which drives the screw 23 to rotate inside the threaded hole sleeve 25 and move synchronously in the axial direction. The threaded connection between the screw 23 and the threaded hole sleeve 25 is used to position the rotation of the driving gear 20 in time, that is, to prevent it from rotating automatically.
[0029] Specifically, a support sleeve is fitted on the gear shaft near the rotating handle 21, and a support rod is fixedly installed at the bottom of the threaded hole sleeve 25. Both the support and the support sleeve are connected to a bracket 26 at the bottom. The bracket 26 is fixed on the worktable 14 to keep the clamping mechanism moving, rotating or lifting synchronously with the worktable 14.
[0030] A positioning key 24 parallel to its axis is installed on the outer wall of the telescopic link 22. The inner wall of the screw 23 corresponding to the positioning key 24 is provided with a positioning groove. The positioning key 24 moves axially along the positioning groove to maintain the telescopic limited rotation connection between the telescopic link 22 and the screw 23.
[0031] A vertically distributed T-shaped slide bar 27 is installed on one side of the lifting column 18 opposite to the tooth groove 19. A T-shaped slide rail 28 is installed on the outer wall of the worktable 14 corresponding to the T-shaped slide bar 27. The T-shaped slide bar 27 slides vertically along the inside of the T-shaped slide rail 28 to keep the tooth groove 19 moving stably under the meshing rotation of the active tooth 20, thereby controlling the longitudinal positioning plate 15 to stably position the workpiece on the worktable 14.
[0032] The workpiece adjustment device includes an X-axis moving component, a Y-axis moving component, a Z-axis moving component, and a rotating component; the above components are arranged in a longitudinally stacked distribution design, with each layer responsible for one degree of freedom of movement; from bottom to top, it is usually bed 10 → X-axis slide → Y-axis slide → Z-axis lifting mechanism → worktable 14;
[0033] The X-axis movement component typically utilizes a precision ball bearing guide or a V-shaped flat guide, on which a precision lead screw and nut mechanism or a lever-type fine-tuning mechanism is mounted. Turning the handwheel rotates the lead screw, driving the worktable slide to move smoothly along the guide.
[0034] Y-axis movement assembly: On top of the left-right moving slide, there is a slide table supported by cross roller guides or similar precision guides. Another fine-tuning screw or wedge block mechanism moves the slide table back and forth. This movement is used to align the measured part of the workpiece with the center of the measuring cap.
[0035] Z-axis moving assembly: It usually adopts a precision lifting screw mechanism or lever-spring compensation mechanism. By rotating the lifting handwheel, the entire worktable pallet is raised or lowered smoothly through the screw.
[0036] Rotating assembly: The top panel of the worktable is usually a spherical support or knife edge support structure. Multiple (usually 3 or 4) adjusting screws distributed around the perimeter are used to lift or lower one side of the panel, thereby achieving a small rotation and tilt of the worktable surface to ensure that the measured surface of the workpiece is perpendicular to the direction of movement of the measuring spindle.
[0037] It should be noted that since the core of this technical solution is the clamping mechanism for positioning the workpiece to be measured, the X-axis moving component, Y-axis moving component, Z-axis moving component and rotating component mentioned above will only be briefly described. For details, please refer to the relevant technical content of existing length measuring instruments. They will not be described in detail here, but this does not affect the completeness of this technical solution.
[0038] The length measuring device includes a reading device 12, a measuring spindle, and a tail tube spindle; the reading device 12, the measuring spindle, the tail tube spindle, the workpiece adjustment device, and the clamping mechanism cooperate with each other to accurately measure the workpiece to be measured;
[0039] The specific measurement process is briefly described as follows: (1) Preparation and zeroing:
[0040] Install measuring caps: Select a pair of flat measuring caps and install them on the ends of the measuring spindle and the tailpipe spindle, respectively.
[0041] Place the standard gauge block: Place a standard gauge block with the same nominal size as the gauge block to be measured on the worktable 14.
[0042] Coarse adjustment and alignment: Move the gauge block directly under the two measuring caps by moving the worktable left and right and back and forth.
[0043] Lifting worktable 14: Raise worktable 14 so that the gauge block is gently clamped between the two measuring caps (pay attention to the measuring force and observe the pointer).
[0044] Fine leveling (the most crucial step): Using the tilt adjustment screw on worktable 14, gently shake the gauge block while observing the pointer of the reading device. When the pointer reaches its inflection point (maximum value), it indicates that the surface of the gauge block is absolutely perpendicular to the measuring axis. At this point, tighten the leveling mechanism.
[0045] Zeroing: In the leveling state, gently press the measuring spindle again to stabilize the pointer. Then, adjust the reading device (such as the index line of the optical gauge tube) to zero using the instrument's zero-point adjustment knob (usually by rotating the friction ring on the tail tube or the handwheel on the optical gauge tube to fine-tune the tail tube length). At this point, the instrument's reference length is set to the length of the standard gauge block.
[0046] (2) Measuring the workpiece:
[0047] Lower worktable 14: Lower worktable 14 to remove the standard gauge block.
[0048] Place the workpiece: Place the gauge block to be measured in the exact same position on the worktable 14.
[0049] Raise the worktable 14 again: Raise the worktable 14 again so that the gauge block to be measured is clamped between the two measuring caps.
[0050] Fine-tuning and reading: Since the workpiece has already been leveled, it is generally not necessary to level it again (unless the workpiece is extremely deformed). Gently move the workpiece and wait for the reading to stabilize before reading the value directly from the reading device.
[0051] If the reading is +5 μm, it means that the workpiece is 5 μm longer than the standard gauge block.
[0052] If the reading is -3 μm, it means that the workpiece is 3 μm shorter than the standard gauge block.
[0053] The role of each component in the process:
[0054] Measuring spindle: Movable, with an internal plane mirror that moves with the spindle. During measurement, it presses the workpiece downwards under the action of a force-measuring spring. Its displacement is the dimensional deviation of the workpiece.
[0055] Tail tube spindle: Adjustable yet fixed during the measurement process, providing a constant reference point. At zero, the reference length is set by fine-tuning its position. During measurement, its position is locked.
[0056] Reading device: It amplifies and displays the minute displacement of the measuring spindle in real time and with precision. Its core is the optical measuring tube, which amplifies the spindle displacement into the movement of a cursor through an optical lever (e.g., the focal length of the objective lens), and then reads the value through the eyepiece. Modern instruments use laser interferometers to directly measure the spindle displacement and display it on a digital display.
[0057] In this embodiment of the invention, a protective pad 16 is provided on the bottom side of the longitudinal positioning plate 15 that contacts the workpiece, in order to reduce the clamping wear of the longitudinal positioning plate 15 on the workpiece to be tested.
[0058] The working principle of this utility model is as follows: Initial preparation: Place the workpiece to be measured on the worktable 14. Start the workpiece adjustment device (including the X-axis moving component, Y-axis moving component, Z-axis moving component and rotation component), and adjust the position of the worktable 14 through its precision guide rail and lead screw mechanism so that the workpiece is aligned with the measuring spindle.
[0059] Clamping and positioning: The operator rotates the handle 21 to drive the active gear 20 to rotate. The active gear 20 meshes with the tooth groove 19 on the lifting column 18, causing the lifting column 18 to rise and fall vertically along the T-shaped slide rail 28 via the T-shaped slide bar 27. The rise and fall of the lifting column 18 is linked to the longitudinal positioning plate 15 through the connecting block 17, so that the longitudinal positioning plate 15 presses the workpiece; the protective pad 16 at the bottom of the longitudinal positioning plate 15 reduces the wear of the workpiece.
[0060] Instant positioning mechanism: When the handle 21 rotates, the drive gear 20 synchronously drives the telescopic link 22 to rotate. The telescopic link 22 cooperates with the positioning groove on the inner wall of the screw 23 through the positioning key 24 on its axial outer wall (the positioning key 24 moves axially within the positioning groove), realizing the telescopic and rotation-limited connection between the telescopic link 22 and the screw 23.
[0061] Measurement execution: After clamping, the length measuring device (including the reading device 12, the measuring spindle and the tail tube spindle) works with the workpiece adjustment device to measure the length; the displacement is read by the reading device 12 to complete the high-precision measurement.
[0062] Release the workpiece: Rotate the handle 21 in the opposite direction, reverse the direction of the drive gear 20, lower the lifting column 18, and release the workpiece from the longitudinal positioning plate 15, which can be quickly disassembled.
[0063] It should be understood that in this application, all rotating, sliding, meshing, belt-driven and other moving parts are well lubricated and not prone to slippage or wear, and each part is provided with a corresponding protective shell. However, in the accompanying drawings of this application, the connection state of each moving part is not shown. It should also be understood that all parts in this application are made of metal or plastic materials with suitable strength in the relevant field to ensure that their structural rigidity meets the actual requirements.
[0064] The preferred embodiments of the present invention have been described in detail above. However, the present invention 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 the present invention.
Claims
1. A length measuring instrument positioning structure, comprising a bed (10), a measuring groove (11), a reading device (12), a workpiece adjustment device, and a worktable (14); wherein the worktable (14) is disposed inside the measuring groove (11), characterized in that, It also includes a clamping mechanism, which includes a longitudinal positioning plate (15), a connecting block (17), a lifting column (18), an active gear (20), a rotating handle (21), a telescopic connecting rod (22), a screw (23), and a threaded hole sleeve (25); length measuring devices are provided on both sides of the top of the workbench (14); The longitudinal positioning plate (15) is longitudinally lifted and installed on one side of the top of the workbench (14). The connecting block (17) is fixedly installed on the outer end wall of the longitudinal positioning plate (15). The lifting column (18) is vertically distributed, and one end of it is connected to the bottom center of the connecting block (17) through a connecting rod. The outer wall of the lifting column (18) is provided with a tooth groove (19). The active tooth (20) is distributed perpendicular to the lifting column (18), and the active tooth (20) meshes with the tooth groove (19). The rotating handle (21) is installed at the end of the tooth shaft of one end of the active tooth (20). One end of the telescopic connecting rod (22) is telescopically and rotationally connected to the end of the tooth shaft of the other end of the active tooth (20), and the other end is telescopically and rotationally connected to the screw (23). The screw (23) is externally threaded to the threaded hole sleeve (25).
2. The length measuring instrument positioning structure according to claim 1, characterized in that, The lifting column (18) is equipped with vertically distributed T-shaped slide bars (27) on one side of the tooth groove (19), and a T-shaped slide rail (28) is installed on the outer wall of the worktable (14). The T-shaped slide bars (27) slide vertically along the inside of the T-shaped slide rail (28).
3. The length measuring instrument positioning structure according to claim 1, characterized in that, The telescopic connecting rod (22) is equipped with a positioning key (24) parallel to its axis on its outer wall, and the screw (23) is provided with a positioning groove in its inner wall, and the positioning key (24) moves axially along the positioning groove.
4. The length measuring instrument positioning structure according to claim 1, characterized in that, A protective pad (16) is provided on the bottom side of the longitudinal positioning plate (15) that contacts the workpiece.
5. The length measuring instrument positioning structure according to claim 1, characterized in that, It also includes a bracket (26), which is fixedly installed on the workbench (14). A support sleeve is fitted on the gear shaft of the active gear (20) near the rotating handle (21). A support rod is fixedly installed at the bottom of the threaded hole sleeve (25). The support sleeve and the bottom of the support rod are both connected to the bracket (26).
6. The length measuring instrument positioning structure according to claim 1, characterized in that, The workpiece adjustment device includes superimposed X-axis moving components, Y-axis moving components, Z-axis moving components, and rotating components.
7. The length measuring instrument positioning structure according to claim 1, characterized in that, The length measuring device includes a reading device (12), a measuring spindle, and a tail tube spindle; the measuring spindle and the tail tube spindle are fitted with measuring caps for clamping the workpiece; the reading device (12) is used to read the displacement of the measuring spindle.
8. The length measuring instrument positioning structure according to claim 1, characterized in that, The lifting column (18) is installed at the bottom center of the connecting block (17) via a connecting rod, and the connecting rod is a rigid connection.