Angle precision measuring tool

Abstract

The utility model discloses an angle precision measuring tool, which relates to the technical field of dimension detection and can solve the technical problem of low angle detection efficiency. The fine adjustment platform is arranged on the right portion of the base and comprises a first sliding table, a second sliding table and a third sliding table which are arranged above the base, the first sliding table is driven by a first micro-motion screw mechanism, the second sliding table is driven by a second micro-motion screw mechanism, and the third sliding table is driven by a third micro-motion screw mechanism; the detection meter is connected to the left side of the third sliding table through a connecting rod, a measuring contact of the detection meter is located at the bottom of the detection meter, and the measuring contact can move above the measured workpiece by adjusting the first micro-motion screw mechanism, the second micro-motion screw mechanism and / or the third micro-motion screw mechanism. The device can be used for angle detection, is low in cost, is high in precision, is high in detection efficiency, is high in universality, and can meet the angle measurement demands of conical surfaces or inclined surfaces of different workpieces.

Description

Technical Field

[0001] The utility model relates to the technical field of size detection, in particular to a precision angle measuring tool. Background Art

[0002] In production fields such as mechanical manufacturing, the angular accuracy of workpieces plays a key role in product quality. During routine production inspections, the angle of many workpieces with tapered or beveled surfaces is a critical parameter and a mandatory inspection item.

[0003] Currently, conventional methods for measuring the angle of conical or inclined surfaces often employ profilometers or three-dimensional coordinate measuring machines. For example, Chinese patent document CN103727916A discloses a precise measurement device and method for the curvature radius of the base surface of a tapered roller. The device comprises a profilometer, a measuring fixture, a sine gauge, a standard gauge block, and a base. The profilometer is mounted on the base, with one end of the sine gauge directly placed on the upper surface of the base. The other end of the sine gauge is placed on the upper surface of the base via a standard gauge block positioned below it. The standard gauge block elevates the sine gauge to an angle with the base surface equal to the roller deflection angle F. The measuring fixture is mounted on the sine gauge to hold the tapered roller being measured. The measurement method employs this device, with the profilometer's measuring head aligned with the base surface of the roller being measured. The distance from the measuring head to the fixture corresponding to the deflection angle is directly measured on the profilometer, and the value of this distance is then converted into the curvature radius.

[0004] However, there are many shortcomings in using profilometers or three-dimensional coordinate measuring machines for measurement: on the one hand, although the use of profilometers or three-dimensional coordinate measuring machines can accurately measure the angles of cones or bevels, the efficiency is low. In large-scale production, it takes a long time to wait for measurement results, which seriously affects the production schedule and cannot meet the needs of mass production; on the other hand, the investment cost of these two types of equipment, profilometers or three-dimensional coordinate measuring machines, is high. Not only is the equipment itself expensive, but the subsequent maintenance and calibration costs are also high, which increases the company's production costs. For some companies with limited budgets, it is unaffordable; in addition, since many products have high requirements for the angles of cones or bevels and strict tolerances, simple measuring tools such as conventional angle rulers cannot achieve accurate measurement, resulting in large errors in the measurement results, which cannot meet the production precision requirements, easily causing product quality problems and increasing the scrap rate. Utility Model Content

[0005] In order to solve one or more technical problems in the prior art, the utility model provides a precision angle measuring tool.

[0006] A precision angle measuring tool:

[0007] Includes base, positioning fixture, fine-tuning platform and inspection table;

[0008] The positioning fixture is detachably connected to the left part of the base, and a restraining structure for restraining the movement of the workpiece to be measured is provided on the positioning fixture;

[0009] The fine-tuning platform is arranged on the right part of the base, and the fine-tuning platform includes a first slide arranged above the base and capable of sliding horizontally, a second slide arranged above the first slide and capable of sliding horizontally, and a third slide arranged above the second slide and capable of sliding vertically, wherein the sliding direction of the first slide is perpendicular to the sliding direction of the second slide, the first slide is driven by a first fine-motion screw mechanism, the second slide is driven by a second fine-motion screw mechanism, and the third slide is driven by a third fine-motion screw mechanism;

[0010] The inspection gauge is a dial indicator or a micrometer, which is connected to the left side of the third slide through a connecting rod. The measuring contact of the inspection gauge is located at the bottom of the inspection gauge. By adjusting the first fine-motion screw mechanism, the second fine-motion screw mechanism and / or the third fine-motion screw mechanism, the measuring contact can be moved above the workpiece to be measured constrained by the constraint structure.

[0011] Preferably, the base is provided with a plurality of positioning holes distributed in parallel along the left-right direction, and the positioning tool is detachably connected to the positioning holes.

[0012] Preferably, a positioning pin is provided at the bottom of the positioning tool, the positioning hole includes a pin hole, and the positioning tool is detachably connected to the pin hole through the positioning pin.

[0013] Preferably, a threaded hole is provided at the bottom of the positioning tool, and the positioning hole includes a stepped hole. The positioning tool is connected to the stepped hole through a bolt and the threaded hole, and the bolt head of the bolt does not protrude outside the stepped hole.

[0014] Preferably, the positioning tool includes a vertical positioning piece, and the constraint structure includes a V-shaped groove provided on the upper portion of the vertical positioning piece, the V-shaped groove opens upward, and the central axis of the V-shaped groove is perpendicular to the sliding direction of the second slide.

[0015] Preferably, the detection gauge is a lever dial indicator or a lever micrometer, and the projection of the measuring contact in the vertical direction is parallel to the central axis of the V-shaped groove.

[0016] Preferably, the positioning tool also includes a transverse positioning member, and the constraint structure also includes a blocking plate arranged on one side of the transverse positioning member, the top height of the blocking plate is higher than the bottom height of the V-shaped groove, and the blocking plate is perpendicular to the central axis of the V-shaped groove.

[0017] Preferably, the V-shaped groove and the blocking plate are both made of permanent magnetic material.

[0018] Preferably, the first fine-motion screw mechanism, the second fine-motion screw mechanism and the third fine-motion screw mechanism are all differential heads.

[0019] Preferably, the fine-tuning platform is provided with a first locking screw for preventing the first slide from sliding, a second locking screw for preventing the second slide from sliding, and a third locking screw for preventing the third slide from sliding.

[0020] Beneficial effects of the utility model:

[0021] Low Cost: The components of this device are all conventional machined parts or measuring tools, making them easy to acquire and cost-effective. Compared to profilometers and coordinate measuring machines, this eliminates the high cost of purchasing equipment and subsequent high maintenance and calibration expenses, significantly reducing production costs and making it particularly suitable for businesses with limited budgets. The base can be adapted to various positioning fixtures, eliminating the need to replace the entire equipment due to workpiece differences, further reducing operating costs.

[0022] Reliable Accuracy: The multi-slide design of this fine-tuning platform, combined with a test gauge for measuring contact displacement, effectively minimizes the interference caused by pressure-induced component deformation, enabling precise measurement of subtle contact displacement changes. Combined with a micro-screw mechanism for precise position adjustment, it allows for measurement over a long range, further ensuring high accuracy of the final measurement results. A restraint structure ensures that the workpiece is stable during measurement, minimizing displacement and shaking, and improving measurement accuracy.

[0023] High detection efficiency: This utility model is easy to operate and can complete the measurement with simple manual operation, effectively meeting the needs of mass production and improving production efficiency.

[0024] Strong versatility: The positioning tooling of the utility model can be customized according to different workpieces, and its constraint structure has various forms and can adapt to workpieces of various shapes and sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention.

[0026] Figure 1 Schematic diagram of a precision angle measuring tool according to an embodiment of the present utility model;

[0027] Figure 2 This is a measurement diagram of the angle precision measuring tool according to the embodiment of the utility model. Figure 1 ;

[0028] Figure 3 This is a measurement diagram of the angle precision measuring tool according to the embodiment of the utility model. Figure 2 ;

[0029] Figure 4 This is a measurement diagram of the angle precision measuring tool according to the embodiment of the utility model. Figure 3 ;

[0030] Figure 5 This is a schematic diagram of a vertical positioning member according to an embodiment of the present utility model. Figure 1 ;

[0031] Figure 6 This is a schematic diagram of a vertical positioning member according to an embodiment of the present utility model. Figure 2 ;

[0032] Figure 7 This is a schematic diagram of the connection between the positioning tool and the base according to an embodiment of the present utility model;

[0033] Figure 8 Schematic diagram of a screw-nut pair mechanism according to an embodiment of the present utility model;

[0034] Figure 9 is an exploded view of a fine-tuning platform according to an embodiment of the present utility model;

[0035] Figure 10 Schematic diagram of a fine-tuning platform according to an embodiment of the present invention.

[0036] In the picture:

[0037] 1. Base; 11. Positioning hole;

[0038] 2. Positioning fixture; 201. Vertical positioning piece; 2011. V-shaped groove; 202. Horizontal positioning piece; 2021. Blocking plate; 21. Positioning pin; 22. Threaded hole;

[0039] 3. Fine-tuning platform; 31. First slide; 311. First fine-motion screw mechanism; 312. First locking screw; 313. First locking plate; 32. Second slide; 321. Second fine-motion screw mechanism; 322. Second locking screw; 323. Second locking plate; 33. Third slide; 331. Third fine-motion screw mechanism; 332. Third locking screw; 333. Third locking plate; 34. Base; 35. Screw-nut pair mechanism; 351. Fixing member; 3511. Guide rail; 3512. Scale line; 352. Sliding member; 353. Screw; 3531. Left section of screw; 3532. Transition section; 3533. Right section of screw; 354. Handle;

[0040] 4. Test meter; 41. Connecting rod; 42. Measuring contact; 43. Dial;

[0041] 5. The workpiece to be measured. DETAILED DESCRIPTION

[0042] The utility model relates to a low-cost, easy-to-use, and highly efficient inspection tool that can quickly determine whether the angle of a product's conical or beveled surface is qualified and can simultaneously measure the specific values of related parameters. This solves the problem of accurately detecting the angle of a workpiece containing a conical or beveled surface during daily production inspections. Accurate measurement of the angle of a conical or beveled surface can be achieved by placing the workpiece on a workpiece positioning fixture 2, adjusting the first slide 31, the second slide 32, and / or the third slide 33, and recording the slide movement distance.

[0043] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. Each example is provided by way of explanation of the present application and does not limit the present application. In fact, it will be clear to those skilled in the art that modifications and variations can be made in the present application without departing from the scope or spirit of the present application. For example, a feature shown or described as part of one embodiment can be used in another embodiment to produce yet another embodiment. Therefore, it is expected that the present application includes such modifications and variations within the scope of the appended claims and their equivalents.

[0044] In the description of this application, the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and do not require that this application must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on this application. The terms "connected", "connected", and "set" used in this application should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0045] Example 1:

[0046] like Figures 1 to 10 As shown, a precision angle measuring tool:

[0047] It includes a base 1, a positioning tool 2, a fine-tuning platform 3 and a detection table 4;

[0048] The positioning fixture 2 is detachably connected to the left portion of the base 1 , and a restraining structure for restraining the movement of the workpiece 5 to be measured is provided on the positioning fixture 2 ;

[0049] The fine-tuning platform 3 is arranged on the right part of the base 1. The fine-tuning platform 3 includes a first slide 31 arranged above the base 1 and can slide horizontally, a second slide 32 arranged above the first slide 31 and can slide horizontally, and a third slide 33 arranged above the second slide 32 and can slide vertically. The sliding direction of the first slide 31 is perpendicular to the sliding direction of the second slide 32. The first slide 31 is driven by a first fine-motion screw mechanism 311, the second slide 32 is driven by a second fine-motion screw mechanism 321, and the third slide 33 is driven by a third fine-motion screw mechanism 331.

[0050] The test gauge 4 is a dial indicator or a micrometer, which is connected to the left side of the third slide 33 through a connecting rod 41. The measuring contact 42 of the test gauge 4 is located at the bottom of the test gauge 4. By adjusting the first fine-motion screw mechanism 311, the second fine-motion screw mechanism 321 and / or the third fine-motion screw mechanism 331, the measuring contact 42 can be moved above the workpiece 5 to be measured that is constrained by the constraint structure.

[0051] During specific implementation, the base 1 can be used to fix the fine-tuning platform 3 and the positioning fixture 2. The positioning fixture 2 can be customized to different shapes for different workpieces, on the one hand to ensure that the position of the workpiece is fixed, and on the other hand to ensure that the workpiece is in the correct position. The positioning fixture 2 is fixed to the base 1 by a detachable connection method, and the appropriate positioning fixture 2 can be replaced according to the different workpieces 5 to be measured. The constraint structure can restrict the workpiece from multiple directions to ensure that the position of the workpiece is stable during measurement. The constraint structure can be a positioning groove, a positioning pin 21, a clip, a baffle, etc., and can be customized according to the different shapes of the workpiece 5 to prevent the workpiece 5 to be measured from being displaced during the measurement process. The three slides of the fine-tuning platform 3 can move in different directions respectively, and precise position adjustment can be achieved through the first micro-motion screw mechanism 311, the second micro-motion screw mechanism 321, and the third micro-motion screw mechanism 331. The detection table 4 is installed on the third slide 33. By adjusting the position of the slide, the measuring contact 42 can accurately contact the measuring part of the workpiece 5 to obtain measurement data.

[0052] Taking the design in which the sliding direction of the second slide 32 is perpendicular to the axial direction of the conical portion of the workpiece 5 as an example, the following measurement steps can be used to measure the conical angle:

[0053] (1) Workpiece positioning: Place the workpiece 5 to be measured on the constraint structure of the positioning fixture 2, ensuring that the workpiece is placed firmly and stably so that the measured position of the workpiece is within the measuring range of the measuring tool.

[0054] (2) Adjustment and zeroing: Adjust the first fine-motion screw mechanism 311, the second fine-motion screw mechanism 321 and / or the third fine-motion screw mechanism 331 so that the measuring contact 42 contacts the conical surface of the workpiece 5 to be measured, and adjust the second fine-motion screw mechanism 321 so that the measuring contact 42 moves on the conical surface of the workpiece 5 to be measured, and observe the reading of the detection table 4. When the reading of the detection table 4 is the largest, it indicates that the measuring contact 42 is at the highest element line of the conical surface of the workpiece 5 to be measured. At this time, adjust the dial 43 of the detection table 4 and return the reading to zero. Record the position information of the first slide 31 and the third slide 33 at this time (which can be obtained through the scale or measuring device related to the slide), and set the position of the first slide 31 at this time to , the position of the third slide 33 is .

[0055] (3) Mobile measurement and reading: Turn the first fine-motion screw mechanism 311 to drive the first slide 31 to move, so that the measuring contact 42 moves along the highest element line of the workpiece 5 to be measured. At this time, the reading of the detection meter 4 will change. Then turn the third fine-motion screw mechanism 331 to drive the third slide 33 to move, so that the reading of the detection meter 4 is zero again. Record the positions of the first slide 31 and the third slide 33 again, and set the position of the first slide 31 at this time to , the position of the third slide 33 is .

[0056] (4) Calculate the cone angle: Assume the cone angle is In cone surface measurement, the tangent value of the cone surface angle is equal to the ratio of the moving distance (height change) of the third slide 33 to the moving distance (horizontal change) of the first slide 31. The calculation formula is: , the cone angle can be calculated by the inverse tangent function .

[0057] Taking the design in which the sliding direction of the second slide 32 is parallel to the contour line direction of the inclined portion of the workpiece 5 as an example, the following measurement steps can be used to measure the cone angle:

[0058] (1) Workpiece positioning: Place the workpiece with the inclined surface to be measured on the positioning fixture 2, and use the constraint structure of the positioning fixture 2 to stabilize the workpiece to ensure that the inclined surface of the workpiece to be measured is within the measuring range of the measuring tool.

[0059] (2) Adjustment and zeroing: Adjust the first fine-motion screw mechanism 311, the second fine-motion screw mechanism 321 and / or the third fine-motion screw mechanism 331 so that the measuring contact 42 contacts the inclined surface of the workpiece 5 to be measured. Since the inclined surface has contour lines, there is no need to find the highest slope line of the workpiece 5 to be measured. When the measuring contact 42 contacts the inclined surface of the workpiece 5 to be measured, the dial 43 of the test meter 4 can be adjusted to zero. Record the initial positions of the first slide 31 and the third slide 33 at this time, set as and .

[0060] (3) Movement measurement and reading: Turn the first fine-motion screw mechanism 311 to move the first slide 31, driving the measuring contact 42 to move along the maximum slope line of the slope. At this time, the reading of the detection meter 4 will change. Then turn the third fine-motion screw mechanism 331 to adjust the position of the third slide 33 so that the reading of the detection meter 4 is zero again. Record the positions of the first slide 31 and the third slide 33 at this time and set them as and .

[0061] (4) Calculate the angle of the inclined plane: Assume the angle of the inclined plane is The tangent value of the inclined plane angle is equal to the ratio of the moving distance of the third slide 33 (height change) to the moving distance of the first slide 31 (horizontal change), and the calculation formula is: , the inverse tangent function can be used to calculate the angle of the inclined plane .

[0062] It should be noted that, although the measurement formulas for the angles of the cone and bevel of the workpiece 5 are given above, it is not necessary to perform trigonometric calculations every time during the actual detection process. - (or - ) is a fixed value, it is only necessary to judge the different workpieces 5 (or ) value, which can quickly screen out products with qualified or unqualified cone / bevel angles.

[0063] Compared to angle measurement methods using profilometers or coordinate measuring machines, this utility model offers low cost and simple operation. It can achieve high-precision angle measurement and is suitable for large-scale production. Through simple manual operation and the coordinated operation of various components, it can achieve measurement accuracy comparable to that of more expensive measuring equipment, significantly reducing measurement costs for enterprises and improving production efficiency.

[0064] Example 2:

[0065] Furthermore, a plurality of positioning holes 11 distributed in parallel along the left-right direction are provided on the base 1 , and the positioning tooling 2 is detachably connected to the positioning holes 11 .

[0066] During implementation, the diameter and depth of positioning holes 11 can be designed based on actual needs to accommodate different connection methods for positioning fixture 2. The advantage of parallel positioning holes 11 is that the position of positioning fixture 2 on base 1 can be flexibly adjusted to meet the positioning requirements of workpieces 5 of varying sizes and shapes. For example, for longer workpieces, positioning fixture 2 can be installed in positioning holes 11 located further outboard to ensure the workpiece is fully positioned within the measurement range. For shorter workpieces, positioning fixture 2 can be installed in positioning holes 11 located further inboard to improve measurement accuracy and stability.

[0067] By setting a plurality of positioning holes 11 distributed in parallel on the base 1, it is possible to quickly adapt to workpieces 5 of different sizes and shapes, thereby improving the versatility of the measuring tool, reducing the need to replace the entire measuring equipment due to differences in workpieces, and further reducing the cost of use.

[0068] Example 3:

[0069] Furthermore, a positioning pin 21 is provided at the bottom of the positioning tool 2 , and the positioning hole 11 includes a pin hole. The positioning tool 2 is detachably connected to the pin hole via the positioning pin 21 .

[0070] In specific implementations, the cooperation between the locating pin 21 and the pin hole can quickly and accurately determine the position of the positioning tool 2, ensuring the positional accuracy of the positioning tool 2 during each installation, thereby improving the repeatability and accuracy of the measurement. The connection method of the locating pin 21 and the pin hole is not only simple to operate, but also enables the rapid disassembly and precise positioning of the positioning tool 2.

[0071] The shapes of the positioning hole 11 are commonly rectangular holes and round holes. When the positioning hole 11 is a rectangular hole, the positioning pin 21 matched therewith can be designed as a rectangular pin. Figure 5 The combination of the positioning hole 11 and the rectangular hole can provide precise positioning in two mutually perpendicular directions, effectively limiting the translation and rotation of the positioning fixture 2 on the horizontal plane. If the positioning hole 11 is designed as a circular hole, the corresponding positioning pin 21 can be a cylindrical pin. To prevent the positioning fixture 2 from rotating, at least two cylindrical pins (such as Figure 6 (As shown). Furthermore, the locating pin 21 can be designed into other special shapes based on actual measurement requirements and workpiece characteristics. For example, a locating pin 21 with a tapered lower section can automatically center itself during insertion into the pin hole, further improving positioning accuracy.

[0072] Example 4:

[0073] Furthermore, a threaded hole 22 is provided at the bottom of the positioning tool 2, and the positioning hole 11 includes a stepped hole. The positioning tool 2 is connected to the stepped hole through a bolt and the threaded hole 22, and the bolt head of the bolt does not protrude outside the stepped hole.

[0074] In specific implementation, the cooperation between the threaded hole 22 and the stepped hole makes the connection between the positioning tool 2 and the base 1 more stable and reliable. At the same time, the bolt head does not protrude from the stepped hole, which can avoid the bolt head from interfering with the workpiece or the measurement process, ensuring smooth measurement.

[0075] Furthermore, both the positioning pin 21 and the threaded hole 22 can be present on the positioning fixture 2. The positioning pin 21 is primarily used to quickly locate and initially secure the position of the positioning fixture 2, while the threaded hole 22 is used to further strengthen the connection strength between the positioning fixture 2 and the base 1. This combination ensures both rapid and accurate positioning and a reliable connection, allowing the positioning fixture 2 to be stably fixed to the base 1 during the measurement process, preventing displacement of the positioning fixture 2 due to workpiece placement or external forces during measurement, thereby further improving measurement accuracy and reliability. Furthermore, this combined connection method can also disperse stress at the connection to a certain extent, extending the service life of the positioning fixture 2 and the base 1.

[0076] Example 5:

[0077] Furthermore, the positioning tool 2 includes a vertical positioning member 201 , and the constraint structure includes a V-shaped groove 2011 arranged on the upper part of the vertical positioning member 201 , the V-shaped groove 2011 opens upward, and the central axis of the V-shaped groove 2011 is perpendicular to the sliding direction of the second slide 32 .

[0078] In practice, the V-groove 2011 structure provides stable and reliable positioning for axial workpieces, maintaining axial stability during measurement and facilitating precise surface measurement by test gauge 4. By employing the V-groove 2011 as a restraining structure, a simple and effective positioning solution is provided for axial workpieces. The upward-facing opening of the V-groove 2011 facilitates the placement and removal of workpieces, and its perpendicular orientation to the sliding direction of the slide allows test gauge 4 to measure along the axial direction of the workpiece, thereby improving measurement accuracy and efficiency.

[0079] Example 6:

[0080] Furthermore, the inspection gauge 4 is a lever dial indicator or a lever micrometer, and the projection of the measuring contact 42 in the vertical direction is parallel to the central axis of the V-shaped groove 2011 .

[0081] In specific implementation, this setting method enables the measuring contact 42 of the detection meter 4 to accurately contact the workpiece surface along the axial direction of the workpiece, ensuring that the direction of the measuring force is consistent with the axial direction of the workpiece, thereby improving the measurement accuracy and reliability.

[0082] The dial 43 of the test gauge 4 can be located at the top of the test gauge 4 to facilitate operator reading. Although other types of dial indicators / micrometers can be used instead of a lever dial indicator / micrometer, the use of a lever dial indicator / micrometer can more accurately measure subtle displacement changes of the measuring contact 42 during movement, thereby improving the accuracy of angle measurement and is more suitable for the overall design and use requirements of the present invention.

[0083] In the prior art, most measuring instruments fail to fully consider the relationship between measuring force and deformation of the measured component, or, if considered, lack effective solutions. The present invention overcomes this traditional limitation by innovatively aligning the measuring contact 42 of a lever dial indicator or micrometer with the central axis of the V-groove 2011, and combining this with the precise adjustment function of the fine-tuning platform 3. This provides a new approach and method for resolving the problem of pressure-induced deformation of the measured component.

[0084] Example 7:

[0085] Furthermore, the positioning tool 2 also includes a transverse positioning member 202, and the constraint structure also includes a blocking plate 2021 arranged on one side of the transverse positioning member 202, the top height of the blocking plate 2021 is higher than the bottom height of the V-shaped groove 2011, and the blocking plate 2021 is perpendicular to the central axis of the V-shaped groove 2011.

[0086] In specific implementations, the blocking plate 2021 can limit the measured workpiece 5 in the lateral direction, working together with the V-groove 2011 to further improve the workpiece's positioning accuracy and stability, preventing the measured workpiece 5 from lateral displacement or tilting during measurement. The addition of the lateral positioning member 202 and blocking plate 2021 to the positioning fixture 2 provides more comprehensive positioning and restraint for the measured workpiece 5, better accommodating workpieces of varying shapes and sizes and improving the measuring tool's versatility and measurement accuracy.

[0087] Example 8:

[0088] Furthermore, the V-shaped groove 2011 and the blocking plate 2021 are both made of permanent magnetic material.

[0089] In specific implementation, the magnetism of permanent magnetic materials can be used to enhance the adsorption force on ferromagnetic workpieces, so that the workpiece 5 to be measured can be more firmly fixed on the positioning tool 2 during the measurement process, preventing the workpiece from being displaced or shaken due to external forces, and further improving the measurement accuracy and reliability.

[0090] Example 9:

[0091] Furthermore, the first fine-motion screw mechanism 311 , the second fine-motion screw mechanism 321 and the third fine-motion screw mechanism 331 are all differential heads.

[0092] In practice, the displacement of the slide can be precisely controlled by rotating the micrometer knob, and the position of the measuring contact 42 of the test gauge 4 can be accurately measured by reading the fixed and movable scales of the micrometer. The micrometer can adjust the movement of the fine adjustment platform 3 and record the position of the lever dial indicator through reading.

[0093] In addition to the differential head, the first fine motion screw mechanism 311 , the second fine motion screw mechanism 321 and the third fine motion screw mechanism 331 may also adopt other forms, such as a screw-nut pair mechanism 35 .

[0094] like Figure 8 As shown, the screw-nut assembly 35 can be composed of a fixed member 351, a sliding member 352 (equivalent to a nut), a screw 353, and a handle 354. The fixed member 351 is provided with a guide rail 3511 and a scale mark 3512. The first slide 31, the second slide 32, or the third slide 33 is slidably connected to the guide rail 3511 via the sliding member 352. The screw 353 includes a left screw section 3531, a transition section 3532, and a right screw section 3533 connected in sequence. The left screw section 3531 is threadedly connected to the fixed member 351, and the right screw section 3533 is threadedly connected to the sliding member 352. The end of the left screw section 3531 is connected to the handle 354. Therefore, by rotating the handle 354, the screw 353 is rotated, thereby causing the sliding member 352 to move on the fixed member 351, thereby driving the first slide 31, the second slide 32, or the third slide 33. By setting a transition section 3532 between the left section 3531 of the screw and the right section 3533 of the screw, the left section 3531 of the screw and the right section 3533 of the screw can be designed to have different leads. For example, the left section 3531 of the screw and the right section 3533 of the screw have the same thread rotation direction, but the lead of the left section 3531 of the screw is greater than the lead of the right section 3533 of the screw. At this time, the motion reduction can be achieved through the lead difference, and the precision fine-tuning function can be realized.

[0095] Example 10:

[0096] Furthermore, the fine-tuning platform 3 is provided with a first locking screw 312 for preventing the first slide 31 from sliding, a second locking screw 322 for preventing the second slide 32 from sliding, and a third locking screw 332 for preventing the third slide 33 from sliding.

[0097] In specific implementation, after the slide is adjusted to the appropriate position, tighten the corresponding locking screw (first locking screw 312, second locking screw 322 or third locking screw 332) to fix the corresponding slide (first slide 31, second slide 32 or third slide 33) in this position, preventing the slide from being displaced due to external forces during the measurement process, thereby ensuring the stability of the measurement. The locking screw can be connected in a threaded manner, with one end connected to a slide or base 34 and the other end connected to the corresponding component of the fine-tuning platform 3 (such as Figures 9 and 10 The first locking plate 313, second locking plate 323, and third locking plate 333 are connected to another slide or base 34 to lock the slides relative to each other. By properly designing the structure and installation position of the locking screws, the slide can be ensured to remain stable during measurement, improving measurement accuracy and reliability.

[0098] In summary, the utility model has low cost, high precision, high detection efficiency and strong versatility, and can meet the needs of measuring the angles of cones or inclined surfaces of different workpieces.

[0099] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various modifications and variations of the present application are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A precision angle measuring tool, comprising a base (1), a positioning fixture (2), a fine-tuning platform (3) and a test table (4), characterized in that: The positioning fixture (2) is detachably connected to the left portion of the base (1), and a restraining structure for restraining the movement of the workpiece (5) to be measured is provided on the positioning fixture (2); The fine-tuning platform (3) is arranged on the right side of the base (1), and the fine-tuning platform (3) includes a first slide (31) arranged above the base (1) and capable of sliding horizontally, a second slide (32) arranged above the first slide (31) and capable of sliding horizontally, and a third slide (33) arranged above the second slide (32) and capable of sliding vertically, wherein the sliding direction of the first slide (31) is perpendicular to the sliding direction of the second slide (32), the first slide (31) is driven by a first fine-motion screw mechanism (311), the second slide (32) is driven by a second fine-motion screw mechanism (321), and the third slide (33) is driven by a third fine-motion screw mechanism (331); The detection gauge (4) is a dial gauge or a micrometer. The detection gauge (4) is connected to the left side of the third slide (33) via a connecting rod (41). The measuring contact (42) of the detection gauge (4) is located at the bottom of the detection gauge (4). By adjusting the first micro-motion screw mechanism (311), the second micro-motion screw mechanism (321) and / or the third micro-motion screw mechanism (331), the measuring contact (42) can be moved above the workpiece (5) to be measured that is constrained by the constraining structure.

2. The angle precision measuring tool according to claim 1, characterized in that: The base (1) is provided with a plurality of positioning holes (11) distributed in parallel along the left-right direction, and the positioning tool (2) is detachably connected to the positioning holes (11).

3. The angle precision measuring tool according to claim 2, characterized in that: A positioning pin (21) is provided at the bottom of the positioning tool (2), the positioning hole (11) includes a pin hole, and the positioning tool (2) is detachably connected to the pin hole via the positioning pin (21).

4. The angle precision measuring tool according to claim 2 or 3, characterized in that: The bottom of the positioning fixture (2) is provided with a threaded hole (22), the positioning hole (11) includes a stepped hole, the positioning fixture (2) is connected to the stepped hole via a bolt and the threaded hole (22), and the bolt head of the bolt does not protrude outside the stepped hole.

5. The angle precision measuring tool according to claim 1, characterized in that: The positioning tool (2) includes a vertical positioning member (201), and the constraint structure includes a V-shaped groove (2011) provided on the upper portion of the vertical positioning member (201), the V-shaped groove (2011) opening facing upward, and the central axis of the V-shaped groove (2011) is perpendicular to the sliding direction of the second slide (32).

6. The angle precision measuring tool according to claim 5, characterized in that: The detection gauge (4) is a lever dial gauge or a lever micrometer, and the projection of the measuring contact (42) in the vertical direction is parallel to the central axis of the V-shaped groove (2011).

7. The angle precision measuring tool according to claim 5 or 6, characterized in that: The positioning tool (2) further comprises a transverse positioning member (202), and the constraint structure further comprises a blocking plate (2021) arranged on one side of the transverse positioning member (202), the top height of the blocking plate (2021) being higher than the bottom height of the V-shaped groove (2011), and the blocking plate (2021) being perpendicular to the central axis of the V-shaped groove (2011).

8. The angle precision measuring tool according to claim 7, characterized in that: The V-shaped groove (2011) and the blocking plate (2021) are both made of permanent magnetic material.

9. The angle precision measuring tool according to claim 1, characterized in that: The first fine-motion screw mechanism (311), the second fine-motion screw mechanism (321), and the third fine-motion screw mechanism (331) are all differential heads.

10. The angle precision measuring tool according to claim 1 or 9, characterized in that: The fine-tuning platform (3) is provided with a first locking screw (312) for preventing the first slide (31) from sliding, a second locking screw (322) for preventing the second slide (32) from sliding, and a third locking screw (332) for preventing the third slide (33) from sliding.

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