A shaft size measuring device

Abstract

The utility model relates to a rotating shaft measurement technical field especially, it relates to a rotating shaft size measuring device, including the base for bearing positioning the rotating shaft of measurement, the first measuring assembly for detecting the rotating shaft length, the second measuring assembly for detecting the rotating shaft diameter and elastic linkage mechanism. The utility model discloses through the base positioning pin fixed rotating shaft, avoids displacement inclination when measuring, and the first micrometer is matched with wear -resisting light weight connecting plate, and the length data is collected with the measuring rod contraction. Diameter measurement relies on two -way cylinder clamping structure and elastic linkage mechanism, and spring provides stable clamping force, and adapts to different diameter rotating shaft, and the second micrometer is linked with the sliding frame, and real -time capture diameter data. With the help of T -shaped slide bar sliding groove structure, can push the sliding frame along the rotating shaft length direction and remove, realize arbitrary position diameter detection, and the cylinder low friction coating protects rotating shaft and guarantees smooth movement, and can also be calibrated through the zeroing mechanism before measuring, and overall consideration measurement accuracy, convenient operation and adaptability.

Description

Technical Field

[0001] This utility model relates to the field of rotating shaft measurement technology, and in particular to a rotating shaft dimension measuring device. Background Technology

[0002] A shaft is a component used for connecting workpieces. This specifically refers to an irregularly shaped shaft with one end round and the other end a hinge-like connecting lug (see details). Figure 4 Widely used in door and window hardware accessories, furniture connectors, mechanical equipment hinges, automotive interior rotating mechanisms, etc., as a core rotating component, it needs to be precisely machined to ensure the coaxiality of the hinge end and the round end, the accuracy of the hinge hole position and the rotation flexibility, which directly affects the assembly quality and performance of the end product.

[0003] In the field of mechanical manufacturing, irregularly shaped shafts with end-connecting structures are widely used in various equipment. The accuracy of their length and diameter at any point along their entire length directly affects the subsequent assembly accuracy and the stability of equipment operation, thus requiring precise inspection. However, existing shaft measurement technologies have significant shortcomings: most measuring devices only have a single measurement function, requiring multiple devices to complete length and diameter measurements separately, resulting in a cumbersome and inefficient process that cannot meet the needs of integrated measurement. Furthermore, for irregularly shaped shafts with end-connecting structures, traditional measurement methods lack dedicated positioning and adaptation structures, making it difficult to stably limit the shaft's movement. Interference from the connecting structure can easily cause the measurement reference to shift, leading to displacement or tilting problems that affect the accuracy of length measurements. Moreover, diameter measurement cannot flexibly cover the entire length range of the shaft, making it difficult to achieve precise inspection at any point and failing to adapt to the structural characteristics of irregularly shaped shafts. Ultimately, both measurement efficiency and accuracy fail to meet actual production requirements. Utility Model Content

[0004] The purpose of this invention is to provide a shaft size measuring device that solves the problem that existing equipment cannot simultaneously achieve integrated measurement, stable positioning, and diameter detection at any position along the entire length when measuring irregularly shaped shafts with one end round and the other end hinged.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A shaft dimension measuring device includes a base for supporting and positioning the shaft to be measured, a first measuring component for detecting the shaft length, a second measuring component for detecting the shaft diameter, and an elastic linkage mechanism. The first measuring component is fixedly installed on the base and has a retractable detection end to collect shaft length data through the amount of contraction. The second measuring component cooperates with the elastic linkage mechanism to limit the shaft through a bidirectional clamping structure. The elastic linkage mechanism has a preset stiffness coefficient to ensure clamping stability. The second measuring component collects shaft diameter data in real time through the contraction amount of the detection end, thereby achieving accurate measurement of the shaft length and the diameter of the entire length.

[0006] Preferably, the base surface is provided with a positioning pin, which is used to insert into the preset positioning hole of the rotating shaft to achieve fixed positioning of the rotating shaft in the measurement area of ​​the base.

[0007] Preferably, the first measuring component is a first dial indicator, and the retractable detection end of the first dial indicator is a measuring rod. The measuring rod is in its maximum extension state in its natural state, and a connecting plate is fixedly connected to the end of the measuring rod. The connecting plate is used to fit against the end of the rotating shaft to transmit pressure, so that the measuring rod produces a corresponding contraction.

[0008] Preferably, the connecting plate is made of a wear-resistant and lightweight material with a hardness ≥ HRC50 and a weight ≤ 5g, and the surface of the connecting plate away from the measuring rod is a smooth plane.

[0009] Preferably, the bidirectional clamping structure includes a first roller and a second roller. The first roller is rigidly connected to the measuring rod of the first measuring component through a mounting bracket, and the second roller is mounted on an elastic linkage mechanism. Both the first roller and the second roller are rotatable structures, and they are in a position close to each other in their natural state.

[0010] Preferably, the elastic linkage mechanism includes a first sliding frame, a second sliding frame, and a spring. The second sliding frame has an "L"-shaped structure and slides with the base. The first sliding frame and the second sliding frame are slidably connected. The spring is disposed between the first sliding frame and the second sliding frame, and the spring is in an extended state in its natural state. The spring stiffness coefficient is 5-20 N / mm.

[0011] Preferably, the second measuring component is a second dial indicator, which is fixedly installed on the second sliding frame. Its measuring rod is in its maximum extension state in its natural state, and the end of the measuring rod is in contact with the first sliding frame. The displacement of the first sliding frame is converted into a contraction amount by squeezing the measuring rod to reflect the diameter of the rotating shaft.

[0012] Preferably, both the first roller and the second roller have a wear-resistant coating on their surfaces, the coating thickness is 0.05-0.2 mm, and the rotational friction coefficient of the roller is ≤0.03.

[0013] Preferably, the sliding between the second sliding frame and the base, and between the first sliding frame and the second sliding frame, are achieved by a T-shaped sliding rod and a T-shaped sliding groove. The T-shaped sliding rod and the T-shaped sliding groove are fitted with a clearance to ensure that the second sliding frame moves linearly along the length of the rotating shaft and the first sliding frame moves linearly in the direction close to or away from the rotating shaft.

[0014] Preferably, the measurement accuracy of both the first and second measuring components is ≥0.001mm, and both are equipped with a pointer zeroing mechanism for initial state calibration before measurement.

[0015] This utility model has at least the following beneficial effects: The rotating shaft is secured by a base positioning pin to prevent displacement and tilting during measurement. The first dial indicator, paired with a wear-resistant and lightweight connecting plate, collects length data using the shrinkage of the measuring rod. Diameter measurement relies on a bidirectional roller clamping structure and an elastic linkage mechanism. Springs provide stable clamping force, adapting to rotating shafts of different diameters. The second dial indicator is linked with the sliding frame to capture diameter data in real time. A T-shaped slide bar and groove structure allows the sliding frame to move along the length of the rotating shaft, enabling diameter detection at any position. The low-friction coating on the rollers protects the rotating shaft and ensures smooth movement. A zeroing mechanism allows for calibration before measurement, comprehensively considering measurement accuracy, ease of operation, and adaptability. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the positioning pin structure of this utility model; Figure 3 This is a schematic diagram of the first sliding frame structure of this utility model; Figure 4 This is a schematic diagram of the rotating shaft body structure of this utility model.

[0018] In the diagram: 1. Base; 2. Positioning pin; 3. First dial indicator; 4. Connecting plate; 5. Second dial indicator; 6. Mounting bracket; 7. First roller; 8. First sliding frame; 9. Spring; 10. Second roller; 11. Second sliding frame; 12. Rotary shaft body. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] Reference Figure 1-4 A shaft dimension measuring device includes a base 1 for supporting and positioning the shaft to be measured, a first measuring component for detecting the shaft length, a second measuring component for detecting the shaft diameter, and an elastic linkage mechanism. The first measuring component is fixedly installed on the base 1 and has a retractable detection end to collect shaft length data through the shrinkage amount. The second measuring component cooperates with the elastic linkage mechanism to limit the shaft through a bidirectional clamping structure. The elastic linkage mechanism has a preset stiffness coefficient to ensure clamping stability. The second measuring component collects shaft diameter data in real time through the shrinkage amount of the detection end, thereby achieving accurate measurement of the shaft length and the diameter of the entire length.

[0022] It integrates length and diameter measurement functions, eliminating the need to switch between multiple devices. The bidirectional clamping and elastic linkage design ensures stable measurement reference and can adapt to the testing needs of shafts of different sizes, improving measurement efficiency and accuracy.

[0023] Furthermore, the base 1 is provided with a positioning pin 2, which is used to insert into the preset positioning hole of the rotating shaft to achieve fixed positioning of the rotating shaft in the measuring area of ​​the base 1.

[0024] The precise engagement of the positioning pin 2 with the positioning hole of the shaft connecting ear prevents displacement or tilting of the shaft during measurement, ensuring accurate positioning of the measurement point and providing a foundation for the reliability of length and diameter data.

[0025] Furthermore, the first measuring component is a first dial indicator 3, and the retractable detection end of the first dial indicator 3 is a measuring rod. The measuring rod is in its maximum extension state in its natural state, and a connecting plate 4 is fixedly connected to the end of the measuring rod. The connecting plate 4 is used to fit with the end of the rotating shaft to transmit pressure, so that the measuring rod produces a corresponding contraction amount.

[0026] The dial indicator has high-precision measurement characteristics. The design of the probe naturally extends to automatically adapt to the length of the shaft. The connecting plate 4 increases the contact area to adapt to shaft bodies 12 of different sizes, avoiding the situation where the end of the probe cannot be directly aligned with the end of the shaft body 12.

[0027] Furthermore, the connecting plate 4 is made of a wear-resistant and lightweight material with a hardness ≥ HRC50 and a weight ≤ 5g, and the surface of the connecting plate 4 away from the measuring rod is a smooth plane.

[0028] The high-hardness material ensures that the connecting plate 4 is wear-resistant and durable, preventing deformation after long-term use; the lightweight design reduces additional pressure on the measuring rod, avoiding affecting the accuracy of shrinkage detection; the smooth surface ensures a tight fit with the end of the rotating shaft, eliminating measurement errors caused by contact gaps.

[0029] Furthermore, the bidirectional clamping structure includes a first roller 7 and a second roller 10. The first roller 7 is rigidly connected to the measuring rod of the first measuring component through the mounting bracket 6. The second roller 10 is mounted on the elastic linkage mechanism. Both the first roller 7 and the second roller 10 are rotatable structures, and they are in a position close to each other in their natural state.

[0030] The dual-roller bidirectional clamping can counteract the radial offset of the rotating shaft, ensuring that the measurement direction is perpendicular to the axis of the rotating shaft and avoiding the measurement angle deviation caused by the single-roller limit; the rotating structure reduces friction with the surface of the rotating shaft, which not only protects the surface of the rotating shaft from scratches, but also facilitates movement and detection along the length of the rotating shaft, improving the smoothness of operation.

[0031] Furthermore, the elastic linkage mechanism includes a first sliding frame 8, a second sliding frame 11, and a spring 9. The second sliding frame 11 has an "L" shaped structure and slides with the base 1. The first sliding frame 8 and the second sliding frame 11 are slidably connected. The spring 9 is disposed between the first sliding frame 8 and the second sliding frame 11, and the spring 9 is in an extended state in its natural state. The spring 9 has a spring constant of 5-20 N / mm.

[0032] The "L"-shaped second sliding bracket 11 balances installation stability and sliding flexibility; the stiffness coefficient of 5-20 N / mm provides sufficient elastic thrust to ensure tight clamping even when there is a deviation in the diameter of the rotating shaft, while avoiding excessive stiffness that causes the rotating shaft to be deformed by pressure or insufficient stiffness that causes the clamping to loosen.

[0033] Furthermore, the second measuring component is a second dial indicator 5, which is fixedly installed on the second sliding frame 11. Its measuring rod is in its maximum extension state in its natural state, and the end of the measuring rod is in contact with the first sliding frame 8. The displacement of the first sliding frame 8 is converted into a contraction amount by squeezing the measuring rod to reflect the diameter of the rotating shaft.

[0034] The second dial indicator 5 is directly linked to the first sliding frame 8, which can convert the change in the diameter of the rotating shaft into the shrinkage of the measuring rod in real time, so as to realize the accurate and real-time acquisition of diameter data. Moreover, the high precision of the dial indicator ensures that the diameter measurement error is controlled within a small range.

[0035] Furthermore, both the first roller 7 and the second roller 10 are provided with a wear-resistant coating with a coating thickness of 0.05-0.2mm, and the rotational friction coefficient of the rollers is ≤0.03.

[0036] The wear-resistant coating extends the service life of the roller and avoids surface wear caused by long-term contact; the coating thickness of 0.05-0.2mm balances wear resistance with the roller's rotational flexibility; the low coefficient of friction further reduces resistance during moving detection, ensuring smooth diameter detection throughout the entire length and reducing the impact of friction on measurement stability.

[0037] Furthermore, the sliding mechanism between the second sliding frame 11 and the base 1, and between the first sliding frame 8 and the second sliding frame 11, is achieved by a T-shaped sliding rod and a T-shaped sliding groove. The T-shaped sliding rod and the T-shaped sliding groove are fitted with a clearance to ensure that the second sliding frame 11 moves linearly along the length of the rotating shaft and the first sliding frame 8 moves linearly in the direction close to or away from the rotating shaft.

[0038] The T-shaped fit structure provides excellent guidance and anti-drop performance, preventing deviation or jamming during sliding; the clearance fit ensures smooth sliding, and by clearly defining the movement direction of the two sliding frames, it ensures that the diameter measurement and full length detection actions correspond accurately, improving the overall movement stability of the device.

[0039] Furthermore, the measurement accuracy of both the first and second measuring components is ≥0.001mm, and both are equipped with a pointer zeroing mechanism for initial state calibration before measurement.

[0040] In summary, for length measurement: after the rotating shaft body 12 is fixed by the positioning pin 2, the position of the first dial indicator 3 is preset and fixed. The measuring rod in its maximum elongation state is connected to the connecting plate 4. The measuring rod adapts to the position of the rotating shaft end by its own contraction. When the connecting plate 4 is tightly attached to one end of the rotating shaft body 12, the measuring rod is subjected to contact pressure and produces a slight contraction. The amount of contraction is amplified into pointer rotation through the internal gear transmission system of the dial indicator. Since the connecting plate 4 has the characteristics of high hardness and light weight, it can ensure stable contact with the end of the rotating shaft and will not cause excessive contraction of the measuring rod due to its own weight or deformation, thus avoiding interference with the measurement results. Read the reading of dial indicator 3. This reading is calculated from the shrinkage of the measuring rod and is the length data of the rotating shaft body 12, thus completing the rapid measurement of the shaft length.

[0041] Diameter measurement: In the initial state, the first sliding frame 8 is in the preset position under the natural extension of the spring 9, the first dial indicator 3 is fixed in position, and its measuring rod is kept in the maximum extension state, which drives the mounting frame 6 and the first roller 7 and the second roller 10 rigidly connected to it to be in a state of mutual proximity; when installing the rotating shaft, the first roller 7 needs to be manually squeezed to push the mounting frame 6 to move towards the first dial indicator 3, so that the measuring rod of the first dial indicator 3 retracts, thereby widening the gap between the two rollers, and the fixed rotating shaft body 12 can be smoothly placed between the first roller 7 and the second roller 10. After the pressure on the first roller 7 is released, the spring 9 generates a stable elastic thrust due to its large stiffness coefficient, which pushes the first sliding frame 8 to move closer to the rotating shaft, so that the second roller 10 on the first sliding frame 8 is tightly pressed against the side wall of the rotating shaft body 12. Since the rotating shaft body 12 is fixed by the positioning pin 2 and cannot move, the second roller 10 generates a reverse force after abutting, which balances the elastic thrust of the spring 9. At this time, the measuring rod of the first dial indicator 3 in the retracted state drives the mounting frame 6 to move away from the dial indicator under the action of its own reset spring 9 until the first roller 7 on the mounting frame 6 is tightly attached to the other side wall of the rotating shaft body 12, forming a stable bidirectional clamping. At this point, the first roller 7 and the second roller 10 cooperate to form a two-way clamping structure, instead of using only a single roller at the end of the second dial indicator 5: On the one hand, the two rollers provide symmetrical support to the rotating shaft from both sides, which can offset the slight radial offset that the rotating shaft may produce during the measurement process and ensure the stability of the measurement reference. If only a single roller is used, the rotating shaft will not have a limit on the other side, and it is easy to tilt due to uneven force, causing the measurement point to deviate from the diameter direction; on the other hand, both rollers are rotating structures, which can reduce the frictional resistance with the rotating shaft surface, avoid scratching the rotating shaft surface, and enable smooth movement during subsequent full-length detection, ensuring the continuity of measurements at different positions. Reading the reading of the second dial indicator 5, its probe is also in its maximum extension state in its natural state, and it is linked with the first sliding frame 8. The position of the first sliding frame 8 is determined by the thrust of the spring 9 and the reaction force of the side wall of the rotating shaft. Its displacement is converted into the probe contraction by squeezing the probe of the second dial indicator 5. This contraction is proportional to the distance between the two rollers (i.e., the diameter of the rotating shaft body 12). Therefore, this reading directly reflects the diameter data of the current measurement position of the rotating shaft body 12.

[0042] Full-length diameter detection of the rotating shaft: If it is necessary to detect whether there is an error in the diameter at different positions of the rotating shaft body 12, the second sliding frame 11 of the "L" shape can be pushed to slide on the surface of the base 1 along the length direction of the rotating shaft body 12. Because spring 9 has a large spring constant, it has strong adaptability: even if there is a diameter deviation at different positions of the rotating shaft, spring 9 can still provide sufficient elastic thrust to ensure that the second roller 10 is always in close contact with the side wall of the rotating shaft; at the same time, the diameter deviation will cause a slight change in the reaction force of the rotating shaft on the first roller 7, which will then push the first sliding frame 8 to produce a slight slide. This slight slide is directly transmitted to the measuring rod of the second micrometer 5, so that the shrinkage of the measuring rod is adjusted in real time and always matches the diameter of the rotating shaft at the current position. During this process, the position of the first micrometer 3 is always fixed, and its measuring rod adapts to the slight movement of the first sliding frame 8 by shrinking, ensuring that the double rollers always maintain a bidirectional clamping state and the measurement direction is always perpendicular to the axis of the rotating shaft. During the movement of the second sliding frame 11, the readings of the second dial gauge 5 at different positions can be read at any time. The amount of shrinkage of its measuring rod is updated in real time as the diameter of the rotating shaft changes. By comparing the readings at different positions, it is possible to intuitively determine whether the diameter of the rotating shaft body 12 is uniform and whether there is any dimensional error.

[0043] 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 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 claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A device for measuring the dimensions of a rotating shaft, characterized in that, The device includes a base for supporting and positioning the shaft to be measured, a first measuring component for detecting the shaft length, a second measuring component for detecting the shaft diameter, and an elastic linkage mechanism. The first measuring component is fixedly installed on the base and has a retractable detection end to collect shaft length data through the amount of contraction. The second measuring component cooperates with the elastic linkage mechanism to limit the shaft through a bidirectional clamping structure. The elastic linkage mechanism has a preset stiffness coefficient to ensure clamping stability. The second measuring component collects shaft diameter data in real time through the contraction of the detection end, thereby achieving accurate measurement of the shaft length and the diameter of the entire length.

2. The shaft dimension measuring device according to claim 1, characterized in that, The base surface is provided with a positioning pin, which is used to insert into the preset positioning hole of the rotating shaft to achieve fixed positioning of the rotating shaft in the measurement area of ​​the base.

3. The shaft dimension measuring device according to claim 2, characterized in that, The first measuring component is a first dial indicator, and the retractable detection end of the first dial indicator is a measuring rod. The measuring rod is in its maximum extension state in its natural state, and a connecting plate is fixedly connected to the end of the measuring rod. The connecting plate is used to fit against the end of the rotating shaft to transmit pressure, so that the measuring rod produces a corresponding contraction.

4. The shaft dimension measuring device according to claim 3, characterized in that, The connecting plate is made of wear-resistant and lightweight material with a hardness ≥ HRC50 and a weight ≤ 5g. The surface of the connecting plate away from the measuring rod is a smooth plane.

5. The shaft dimension measuring device according to claim 1, characterized in that, The bidirectional clamping structure includes a first roller and a second roller. The first roller is rigidly connected to the measuring rod of the first measuring component through a mounting bracket. The second roller is mounted on an elastic linkage mechanism. Both the first roller and the second roller are rotatable structures and are in a position close to each other in their natural state.

6. The shaft dimension measuring device according to claim 5, characterized in that, The elastic linkage mechanism includes a first sliding frame, a second sliding frame, and a spring. The second sliding frame has an "L" shaped structure and slides with the base. The first sliding frame and the second sliding frame are slidably connected. The spring is disposed between the first sliding frame and the second sliding frame, and the spring is in an extended state in its natural state. The spring stiffness coefficient is 5-20 N / mm.

7. A shaft dimension measuring device according to claim 6, characterized in that, The second measuring component is a second dial indicator, which is fixedly installed on the second sliding frame. Its measuring rod is in its maximum extension state in its natural state, and the end of the measuring rod is in contact with the first sliding frame. The displacement of the first sliding frame is converted into a contraction amount by squeezing the measuring rod to reflect the diameter of the rotating shaft.

8. The shaft dimension measuring device according to claim 5, characterized in that, Both the first and second rollers have a wear-resistant coating on their surfaces, the coating thickness is 0.05-0.2mm, and the rotational friction coefficient of the rollers is ≤0.

03.

9. A shaft dimension measuring device according to claim 6, characterized in that, The sliding mechanism between the second sliding frame and the base, and between the first sliding frame and the second sliding frame, is achieved by a T-shaped sliding rod and a T-shaped sliding groove. The T-shaped sliding rod and the T-shaped sliding groove are fitted with a clearance to ensure that the second sliding frame moves linearly along the length of the rotating shaft and the first sliding frame moves linearly in the direction close to or away from the rotating shaft.

10. A shaft dimension measuring device according to claim 2, characterized in that, The measurement accuracy of both the first and second measuring components is ≥0.001mm, and both are equipped with a pointer zeroing mechanism for initial state calibration before measurement.

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