Standardized fixture for calibration of a measuring instrument

Abstract

The utility model relates to the technical field of measurement calibration, the utility model standardization fixture for the calibration of measuring instrument, including fixed base, measuring instrument clamping part and gauge block clamping part, the utility model has following advantages: the utility model integrates measuring instrument clamping part and gauge block clamping part on the same fixed base, and through adjustable fixed unit, the whole fixture is stably installed on the table top, provides a unified, reliable reference platform for the calibration process, fundamentally eliminates the shaking and displacement caused by handheld operation, ensures the stability of the calibration environment, ensures that the measuring surface of gauge block can quickly and accurately realize ideal parallel contact with the micrometer measuring anvil surface, improves the alignment accuracy, uses mechanical clamp to fix and operate gauge block, completely avoids the thermal expansion error caused by the direct contact of hand with gauge block, ensures the accuracy of calibration reference.

Description

Technical Field

[0001] This utility model relates to the field of metrology calibration technology, specifically to a standardized fixing fixture for calibrating measuring instruments. Background Technology

[0002] Calibration of measuring instruments is a fundamental step in industrial measurement and quality control, aiming to ensure the accuracy and traceability of measuring tools. As a common length measuring instrument, the calibration process of an outside micrometer typically requires comparison with standard gauge blocks to verify its indication error and measurement accuracy.

[0003] Currently, the calibration of outside micrometers mostly uses the manual holding method of the gauge block. This hand-held method is difficult to maintain absolute stability and is prone to slight shaking or tilting. As a result, the two measuring surfaces of the gauge block cannot form ideal parallel contact with the anvil surface of the outside micrometer, thus introducing alignment errors and directly affecting the accuracy of the calibration results. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, one objective of this invention is to propose a standardized fixture for calibrating measuring instruments. Through a highly integrated, multi-directionally adjustable dedicated fixture, it creates a stable, precise, repeatable, and efficient working environment for the calibration of outside micrometers, thereby ensuring the highest accuracy and reliability of the calibration results.

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows: a standardized fixing fixture for calibrating measuring instruments, comprising: a fixed base, the fixed base including a base plate and an adjustable fixing unit fixedly disposed on the bottom surface of the base plate, the base plate having a first sliding groove extending to both end faces along its long side; a measuring instrument clamping part, the measuring instrument clamping part including a fixing rod fixedly disposed on the base plate, the fixing rod having an adjustable instrument clamping unit; and a gauge block clamping part, the gauge block clamping part including a first slider slidably disposed in the first sliding groove, the first slider having a second sliding groove and a second slider slidably disposed in the second sliding groove, the second slider having an adjustable gauge block clamping unit.

[0006] Preferably, the adjustable fixing unit includes an L-shaped clamping plate fixedly disposed on the bottom surface of the base plate, a tightening bolt threadedly connected to the horizontal surface of the L-shaped clamping plate, and an abutment plate disposed at the top of the tightening bolt opposite to the base plate.

[0007] Preferably, the device clamping unit includes a fixed rod, a lower clamping plate is fixedly provided at the top end of the fixed rod, an adjusting bolt is threaded onto the fixed rod, and an upper clamping plate is sleeved on the adjusting bolt and disposed opposite to the lower clamping plate.

[0008] Preferably, a flexible protective pad is provided on the clamping surfaces of the upper clamping plate and the lower clamping plate.

[0009] Preferably, the second slider and the second groove are in a static friction fit.

[0010] Preferably, the gauge block clamping unit includes an adjusting telescopic rod disposed on the second slider. The adjusting telescopic rod is provided with a fixing bolt so that it can be locked in the length direction. The top end of the adjusting telescopic rod is provided with a U-shaped frame. A clamping rod is rotatably connected to the U-shaped frame through a damping shaft. The clamping rod is provided with a clamping strip for clamping the gauge block.

[0011] Preferably, the clamping surface of the clamping bar is provided with an anti-slip pad.

[0012] With the above structure, this utility model has the following advantages:

[0013] This invention integrates the measuring instrument clamping part and the gauge block clamping part onto the same fixed base, and uses an adjustable fixing unit to securely mount the entire fixture on the table, providing a unified and reliable reference platform for the calibration process. This fundamentally eliminates the shaking and displacement caused by hand operation, ensuring the stability of the calibration environment and ensuring that the measuring surface of the gauge block can quickly and accurately achieve ideal parallel contact with the micrometer anvil, thus improving alignment accuracy. Using mechanical clamps to fix and operate the gauge block completely avoids thermal expansion errors caused by direct contact between the hand and the gauge block, ensuring the accuracy of the calibration reference.

[0014] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present invention will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model. Figure 1 .

[0017] Figure 2 This is a schematic diagram of the structure of this utility model. Figure 2 .

[0018] As shown in the figure: 1. Base plate; 2. First slide groove; 3. Fixing rod; 4. Lower clamping plate; 5. Upper clamping plate; 6. Flexible protective pad; 7. Adjusting bolt; 8. First slider; 9. Second slide groove; 10. Second slider; 11. Adjusting telescopic rod; 12. Fixing bolt; 13. U-shaped frame; 14. Clamping rod; 15. Clamping strip; 16. Anti-slip pad; 17. L-shaped clamping plate; 18. Tightening bolt; 19. Abutment plate. Detailed Implementation

[0019] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0020] In the description of this application, it should be noted that, unless otherwise expressly 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0021] Combination Figures 1-2 As shown, the standardized fixture for calibrating measuring instruments includes a fixed base, a measuring instrument clamping part, and a gauge block clamping part.

[0022] The fixed base includes a base plate 1 and an adjustable fixing unit fixedly disposed on the bottom surface of the base plate 1. The base plate 1 has a first sliding groove 2 extending to both end faces along its long side. The measuring instrument clamping part includes a fixing rod 3 fixedly disposed on the base plate 1. The fixing rod 3 is provided with an adjustable instrument clamping unit. The gauge block clamping part includes a first slider 8 slidably disposed in the first sliding groove 2. The first slider 8 has a second sliding groove 9 and a second slider 10 slidably disposed in the second sliding groove 9. The second slider 10 is provided with an adjustable gauge block clamping unit.

[0023] In one embodiment of this utility model, such as Figure 2As shown, the adjustable fixing unit includes an L-shaped clamping plate 17 fixedly mounted on the bottom surface of the base plate 1. A tightening bolt 18 is threadedly connected to the horizontal surface of the L-shaped clamping plate 17, and an abutment plate 19 is provided at the top of the tightening bolt 18 opposite to the base plate 1. Specifically, during installation, the vertical and horizontal surfaces of the L-shaped clamping plate 17 are hooked onto the upper and lower sides of the edge of the workbench to form a preliminary positioning. Then, the tightening bolt 18 is screwed on, and the abutment plate 19 at its top moves upward until it is tightly pressed against the lower surface of the workbench. The clamping force generated by the L-shaped clamping plate 17 and the abutment plate 19 together firmly fixes the entire fixture to the workbench.

[0024] In one embodiment of this utility model, such as Figure 1 As shown, the instrument clamping unit includes a fixed rod 3, with a lower clamping plate 4 fixedly mounted on the top of the fixed rod 3. An adjusting bolt 7 is threaded onto the fixed rod 3, and an upper clamping plate 5 is sleeved on the adjusting bolt 7, which is opposite to the lower clamping plate 4. Specifically, the upper clamping plate 5 is sleeved on the adjusting bolt 7 through its central hole and can slide along the axial direction of the adjusting bolt 7. When the adjusting bolt 7 is rotated clockwise, due to the threaded transmission, the adjusting bolt 7 is pushed downward, pushing the upper clamping plate 5 to move downward along the fixed rod 3, thereby working in conjunction with the lower clamping plate 4 to clamp the micrometer frame placed between them. Rotating the adjusting bolt 7 counterclockwise will cause the upper clamping plate 5 to move upward, releasing the micrometer, thus achieving fast, linear, and adjustable clamping of the micrometer.

[0025] In one embodiment of this utility model, such as Figure 1 As shown, flexible protective pads 6 are provided on the clamping surfaces of the upper clamping plate 5 and the lower clamping plate 4. Specifically, the flexible protective pads 6 can be made of elastic materials such as rubber, polyurethane, or soft plastic, and are fixed to the metal substrate of the clamping plates by bonding or embedding. Their functions are twofold: first, to increase the friction with the micrometer frame surface through their own elastic deformation, preventing the instrument from sliding during clamping; and second, to act as a buffer medium, preventing the hard metal clamping plates from directly contacting and scratching the precision-machined surface of the micrometer, thus providing effective protection.

[0026] In one embodiment of this utility model, the second slider 10 and the second groove 9 are in a static friction fit. Specifically, the dimensions of the second slider 10 are precisely designed such that there is a slight interference fit between it and the width of the second groove 9, or the coefficient of friction is increased through surface treatment. This allows the second slider 10 to slide in the second groove 9 with a certain external force, but when the external force is removed, it can self-lock at any position by static friction without shifting due to its own weight or slight disturbance. This eliminates the need for additional locking screws and simplifies the fixing operation after fine adjustment in the direction perpendicular to the micrometer measuring axis.

[0027] In one embodiment of this utility model, such as Figure 2As shown, the gauge block clamping unit includes an adjusting telescopic rod 11 mounted on the second slider 10. The adjusting telescopic rod 11 is provided with a fixing bolt 12 so that it can be locked in the length direction. The top end of the adjusting telescopic rod 11 is provided with a U-shaped frame 13. A clamping rod 14 is rotatably connected to the U-shaped frame 13 via a damping shaft. The clamping rod 14 is provided with a clamping strip 15 for clamping the gauge block. Specifically, the adjusting telescopic rod 11 consists of a sleeve and a rod inserted therein. It is fixed by tightening the fixing bolt 12 to fit tightly against the rod, thereby locking the extension length of the rod and realizing the adjustment and fixation of the gauge block in the height direction. The clamping rod 14 is connected between the two side walls of the U-shaped frame 13 through a damping shaft. The shaft has built-in damping material, which makes it have appropriate resistance when rotating, allowing the operator to manually apply torque to accurately adjust the pitch angle of the clamping rod 14, so that the measuring surface of the gauge block on the clamping bar 15 is parallel to the micrometer anvil surface. After the adjustment is completed, the damping force can maintain the angle unchanged without additional locking. The clamping bar 15 is a long strip component that can provide four-sided contact to stably support the gauge block.

[0028] In one embodiment of this utility model, such as Figure 2 As shown, the clamping surface of the clamping bar 15 is provided with an anti-slip pad 16. Specifically, the anti-slip pad 16 is usually made of soft rubber or silicone, and the surface may be designed with fine textures to further enhance friction. Its main function is to prevent the gauge block from accidentally slipping off the clamping bar 15, and also to prevent the metal clamping bar 15 from directly contacting the gauge block, effectively blocking contaminants such as hand sweat, and protecting the gauge block from corrosion.

[0029] Standardized fixing clamps for calibrating measuring instruments according to embodiments of this utility model.

[0030] In use, firstly, the entire fixture is securely mounted on the edge of the calibration workbench using the adjustable fixing unit. Then, the frame portion of the outside micrometer to be calibrated is placed on the lower clamping plate 4 of the instrument clamping unit. Rotating the adjusting bolt 7 drives the upper clamping plate 5 to move downward, thereby firmly and securely clamping the micrometer without damage. Next, according to the measuring range of the micrometer, a standard gauge block of appropriate size is selected and placed between the clamping bars 15 of the gauge block clamping unit. By sliding the first slider 8 and the second slider 10, the gauge block can be initially positioned on the micrometer. The area between the two anvils is then precisely adjusted. The height of the telescopic rod 11 is finely adjusted, and the angle of the clamping rod 14 is finely adjusted via the damping shaft. Finally, the two measuring surfaces of the gauge block are made to achieve complete, parallel, and stable contact with the fixed and movable anvils of the micrometer, respectively. At this point, the measuring force device of the micrometer can be smoothly rotated to take a reading and complete the calibration operation. This eliminates interference from human instability factors such as hand tremors and body temperature, allowing the micrometer to measure the standard gauge block under ideal conditions, thereby obtaining true and reliable calibration data.

[0031] The present invention and its embodiments have been described above. This description is not restrictive, and the embodiments shown throughout the text are only one of the embodiments of the present invention. The actual structure is not limited to this. In conclusion, if a person skilled in the art is inspired by this description and designs a similar structure and embodiment without departing from the inventive spirit of the present invention, such design should fall within the protection scope of the present invention.

Claims

1. A standardized fixing fixture for calibrating measuring instruments, characterized in that, include: A fixed base, the fixed base including a base plate and an adjustable fixing unit fixedly disposed on the bottom surface of the base plate, the base plate having a first sliding groove extending to both end faces along its long side; The measuring instrument clamping part includes a fixing rod fixedly mounted on the base plate, and the fixing rod is provided with an adjustable instrument clamping unit; The gauge block clamping part includes a first slider that is slidably disposed in the first slide groove, a second slide groove is provided on the first slider and a second slider is slidably disposed in the second slide groove, and an adjustable gauge block clamping unit is provided on the second slider.

2. The standardized fixing fixture for calibrating measuring instruments according to claim 1, characterized in that: The adjustable fixing unit includes an L-shaped clamping plate fixedly disposed on the bottom surface of the base plate. A tightening bolt is threadedly connected to the horizontal surface of the L-shaped clamping plate, and an abutment plate is provided at the top of the tightening bolt opposite to the base plate.

3. The standardized fixing fixture for calibrating measuring instruments according to claim 1, characterized in that: The device clamping unit includes a fixed rod, a lower clamping plate is fixedly provided at the top end of the fixed rod, an adjusting bolt is threaded onto the fixed rod, and an upper clamping plate is sleeved on the adjusting bolt and disposed opposite to the lower clamping plate.

4. The standardized fixing fixture for calibrating measuring instruments according to claim 3, characterized in that: Flexible protective pads are provided on the clamping surfaces of the upper clamping plate and the lower clamping plate.

5. The standardized fixing fixture for calibrating measuring instruments according to claim 1, characterized in that: The second slider and the second groove are in a static friction fit.

6. The standardized fixing fixture for calibrating measuring instruments according to claim 1, characterized in that: The gauge block clamping unit includes an adjusting telescopic rod disposed on the second slider. The adjusting telescopic rod is provided with a fixing bolt so that it can be locked in the length direction. The top end of the adjusting telescopic rod is provided with a U-shaped frame. A clamping rod is rotatably connected to the U-shaped frame through a damping shaft. The clamping rod is provided with a clamping strip for clamping the gauge block.

7. The standardized fixing fixture for calibrating measuring instruments according to claim 6, characterized in that: The clamping surface of the clamping bar is provided with an anti-slip pad.

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