Auxiliary device for measuring form and location tolerance of rotating shaft of limited angle torque motor

Abstract

The utility model belongs to the field of micromotor manufacturing, and discloses an auxiliary device for measuring form and location tolerance of a limited angle torque motor rotating shaft, which adopts an L-shaped right-angle structure base, a horizontal fixed surface is provided with a positioning shaft capable of axially displacing, one end of the positioning shaft is provided with an arc-shaped groove, and the arc-shaped groove is matched with a vertical positioning surface to clamp a flat shaft part of the rotating shaft. The positioning shaft is sleeved with the spring and abuts against the tail end of the horizontal fixing face, the spring is contracted by pulling one end of the positioning shaft, and after release, the spring drives the positioning shaft to reset to complete clamping. The vertical positioning surface of the L-shaped base is used for providing a quantitative reference, the arc-shaped groove is attached to the arc-shaped surface of the flat shaft, the flat surface of the flat shaft is attached to the vertical positioning surface, and the posture of the flat shaft is accurately positioned. By adopting the device, the problem of large deviation caused by lack of quantitative reference in manual adjustment can be solved, the flat shaft is accurately and vertically placed, the technical bottleneck of poor measurement result precision in the prior art is effectively solved, and the measurement precision is improved.

Description

Technical Field

[0001] This utility model belongs to the field of micro motor manufacturing technology, specifically relating to an auxiliary device for measuring the form and position tolerances of a finite angle torque motor shaft. Background Technology

[0002] As a core actuator in direct rotary drive, the finite-angle torque motor, with its high dynamic response, high power density, and direct drive characteristics, has become a key component in high-precision servo valve control systems. This type of motor receives electrical signal commands from the valve control board and directly converts electrical energy into precise and controllable torque output, driving the servo valve spool to achieve millimeter-level displacement and micro-radian-level angular precision movements. To ensure the bidirectional controllability and displacement repeatability of the valve spool movement, the motor incorporates a closed-loop control system that can correct dynamic errors during the valve spool movement in real time. Simultaneously, to cope with abnormal operating conditions such as sudden power outages, the motor shaft incorporates an elastic energy storage mechanism, releasing mechanical potential energy to drive the valve spool to reset, ensuring system safety. At the mechanical interface design level, the small ball structure at the end of the motor shaft serves as the direct drive interface with the servo valve spool; its surface morphology and spatial position parameters directly affect the smoothness, sealing performance, and service life of the valve spool movement.

[0003] The small ball is connected to the top of the rotating shaft. When it is necessary to measure the two flat surfaces on the ball and the ball's position, the flat surface of the rotating shaft needs to be in a theoretically vertical state. Using the flat surface of the rotating shaft as a positioning reference, and then collecting two measurement references on the rotating shaft body, accurate measurement of the ball's flat surfaces and position can be achieved. However, existing technology has significant technical bottlenecks in measuring the machining accuracy of the ball driven by the motor rotating shaft end. In the current process, the ball is basically shaped through turning and grinding processes, and then two flat surfaces for installation and positioning are machined using a slow wire EDM process. However, the final spatial position accuracy measurement still relies on manual operation: the measuring personnel need to manually adjust the flat shaft to a theoretically vertical state by visual inspection or simple measuring tools, and then use specialized inspection tools such as image measuring instruments to measure parallelism and position. It is evident that the manual adjustment process lacks a quantitative reference, and the actual posture of the flat shaft deviates significantly from the theoretical vertical direction, resulting in significant systematic errors in the measurement data.

[0004] Therefore, it can be seen that for measuring the form and position tolerances of the shaft of a finite angle torque motor, the existing technology relies on manually adjusting the direction of the flat shaft, which makes it difficult to ensure that the flat shaft is placed accurately vertically, resulting in poor measurement accuracy. Utility Model Content

[0005] This utility model provides an auxiliary device for measuring the form and position tolerance of a finite angle torque motor shaft. By optimizing the mechanical structure design and the reference positioning method, this device solves the problems of inaccurate positioning of flat shafts, low measurement efficiency and insufficient accuracy in existing measurements, and achieves accurate and efficient measurement of the form and position tolerance of the shaft.

[0006] To achieve the above objectives, the present invention adopts the following technical content:

[0007] An auxiliary device for measuring the form and position tolerances of a finite angle torque motor shaft includes a base;

[0008] The base adopts an L-shaped right-angle structure, including a horizontal fixing surface and a vertical positioning surface;

[0009] A positioning shaft capable of axial displacement is provided on the horizontal fixed surface;

[0010] One end of the positioning shaft is provided with an arc-shaped groove, which cooperates with the vertical positioning surface to clamp the flat shaft portion of the rotating shaft; during the clamping process, the arc-shaped surface of the flat shaft portion fits against the arc-shaped groove, and the flat surface fits against the vertical positioning surface;

[0011] A spring is fitted onto the shaft of the positioning shaft;

[0012] The spring abuts against the end of the positioning shaft and the horizontal fixing surface;

[0013] When clamping the rotating shaft, pulling the other end of the positioning shaft causes the spring to contract. After releasing the positioning shaft, the spring drives the positioning shaft to reset, so as to form a fit with the vertical positioning surface and complete the clamping of the rotating shaft.

[0014] Furthermore, a limiting groove is formed on the horizontal fixed surface, and the shaft of the positioning shaft and the spring are both disposed in the limiting groove.

[0015] Furthermore, an operating handle is provided at the other end of the positioning shaft.

[0016] Furthermore, the operating handle is made of knurled nut; the knurled nut is connected to the other end of the positioning shaft by a thread.

[0017] Furthermore, the vertical positioning surface has the same width as the flat surface of the flat shaft portion of the rotating shaft.

[0018] Furthermore, an anti-slip pad is bonded to the inner wall of the arc-shaped groove of the positioning shaft.

[0019] Furthermore, a cover plate is provided above the shaft of the positioning shaft, and the cover plate is fastened to the horizontal fixed surface.

[0020] Furthermore, the cover plate is connected to the horizontal fixing surface of the base by positioning screws.

[0021] Furthermore, the base is made of alloy steel.

[0022] Furthermore, the spring is a cylindrical helical compression spring.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] This invention provides an auxiliary device for measuring the form and position tolerances of a finite angle torque motor shaft. The device employs an L-shaped right-angle base. A positioning shaft with an axially displaceable groove at one end is mounted on the horizontal fixed surface. The groove engages with the vertical positioning surface to clamp the flat shaft portion. A spring is fitted onto the positioning shaft and abuts against its end on the horizontal fixed surface. Pulling one end of the positioning shaft retracts the spring, and releasing it causes the spring to return the positioning shaft to its original position, completing the clamping process. The vertical positioning surface of the L-shaped base provides a quantitative reference. The groove fits against the curved surface of the flat shaft, and the flat surface of the shaft fits against the vertical positioning surface, accurately positioning the flat shaft's orientation. This device overcomes the problem of large deviations caused by the lack of a quantitative reference in manual adjustments, ensuring precise vertical placement of the flat shaft. It effectively solves the technical bottleneck of poor measurement accuracy in existing technologies, improving overall measurement precision.

[0025] Preferably, in this invention, a limiting groove is provided on the horizontal fixed surface, and the positioning shaft and spring are placed in the limiting groove to limit their displacement direction, avoid deviation and shaking, ensure the stability of the clamping process, ensure the positioning accuracy of the flat shaft, and improve the reliability of measurement.

[0026] Preferably, in this utility model, it is convenient for operators to pull the positioning shaft, simplifying the operation process, improving the convenience and efficiency of operation, and facilitating the rapid completion of shaft clamping and measurement.

[0027] Preferably, in this invention, the knurled nut increases friction, making it easier for the operator to grip and apply force; the threaded connection makes the handle easy to install and disassemble, facilitating maintenance and replacement.

[0028] Preferably, in this invention, the vertical positioning surface and the flat surface of the flat shaft have the same width, ensuring that the flat surface of the flat shaft and the vertical positioning surface are completely fitted together, eliminating gaps caused by width mismatch, improving positioning accuracy, and reducing measurement errors.

[0029] Preferably, in this invention, an anti-slip pad is bonded to the inner wall of the arc-shaped groove, which can increase the friction between the flat shaft and the arc-shaped groove, prevent the flat shaft from sliding during clamping, ensure the stability of the flat shaft position, and improve measurement accuracy.

[0030] Preferably, in this invention, the positioning shaft is provided with a cover plate and fastened together to protect the positioning shaft and the spring, prevent external dust and impurities from entering, and limit the axial displacement range of the positioning shaft to ensure clamping stability.

[0031] Preferably, in this utility model, the cover plate is connected to the base by positioning screws, so that the cover plate is firmly installed, easy to disassemble and repair, and convenient to maintain the positioning shaft and spring.

[0032] Preferably, in this invention, the base is made of alloy steel, which has the characteristics of high strength, high hardness, and good wear resistance, ensuring that the base will not deform during long-term use, providing stable support for the rotating shaft, and extending the service life of the device.

[0033] Preferably, in this invention, the spring is a cylindrical helical compression spring. Cylindrical helical compression springs have a simple structure, stable performance, and uniform elastic coefficient, which can provide stable elastic force, ensure reliable resetting of the positioning shaft, and guarantee smooth clamping action. Attached Figure Description

[0034] Figure 1 A three-dimensional structural schematic diagram of an auxiliary device for measuring the form and position tolerances of a finite angle torque motor shaft, provided for an embodiment of this utility model;

[0035] Figure 2 A side view of an auxiliary device for measuring the form and position tolerances of a finite angle torque motor shaft, provided in an embodiment of this utility model;

[0036] Figure 3 This is a three-dimensional structural diagram from another perspective of an auxiliary device for measuring the form and position tolerances of a finite angle torque motor shaft, provided as an embodiment of the present invention.

[0037] Figure label:

[0038] 1. Base; 2. Positioning shaft; 3. Spring; 4. Cover plate; 5. Positioning screw; 6. Knurled nut; 7. Rotating shaft. Detailed Implementation

[0039] To make the technical problem solved by this utility model, the technical solution, and the beneficial effects clearer, the following specific embodiments provide a further detailed description of this utility model. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and are not intended to limit it.

[0040] 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.

[0041] 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.

[0042] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0043] In the description of the embodiments of this utility model, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0044] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0045] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0046] As mentioned in the background section, the ball is connected to the top of the shaft. When it is necessary to measure the two flat surfaces of the ball and the ball's position, the flat surface of the shaft needs to be in a theoretically vertical state and used as a positioning reference in order to measure the flat surface of the ball and the ball's position. However, in the process of measuring the form and position tolerance of the shaft of a finite angle torque motor, the direction of the flat shaft is usually adjusted manually, which makes it difficult to ensure that the flat shaft is placed accurately vertically. At the same time, it will also block the two measurement references on the shaft being measured. Therefore, the parallelism and position of the ball cannot be measured.

[0047] To overcome the above problems, this utility model provides an auxiliary device for measuring the form and position tolerance of a finite angle torque motor shaft. Using this auxiliary device, there is no need to rely on manual adjustment of the direction of the flat shaft, thereby ensuring that the flat shaft is accurately placed vertically, improving the accuracy and efficiency of the measurement results.

[0048] like Figures 1 to 3 As shown, this embodiment provides an auxiliary device for measuring the form and position tolerances of a finite angle torque motor shaft, including:

[0049] The base 1, employing an L-shaped right-angle structure, consists of a horizontal fixed surface and a vertical positioning surface. A positioning shaft 2, capable of axial displacement, is provided on the horizontal fixed surface. One end of the positioning shaft 2 has an arc-shaped groove that mates with the vertical positioning surface to clamp the flat shaft portion of the rotating shaft 7. During clamping, the arc-shaped surface of the flat shaft engages with the arc-shaped groove, and the flat surface engages with the vertical positioning surface, achieving precise positioning. A spring 3 is fitted onto the shaft of the positioning shaft 2, enabling quick assembly and disassembly of the rotating shaft 7; the spring 3 is preferably a cylindrical helical compression spring. The spring 3 abuts against the end of the positioning shaft 2 and the horizontal fixed surface, providing a restoring force. Figure 2 As shown, the workpiece clamping point is provided with a pressure of 2KG by the spring 3, which can ensure the clamping strength of the measured shaft 7 and prevent the measured shaft 7 from being damaged by the measuring equipment. Specifically, one end of the spring 3 abuts against the inner end face of one end of the clamping part of the positioning shaft 2, and the other end abuts against the inner end face of the horizontal fixed surface of the base 1. In this embodiment, in order to facilitate the axial displacement of the positioning shaft 2, the horizontal fixed surface can be set as a horizontal fixed surface with a stepped structure, thereby facilitating the horizontal movement of the positioning shaft 2.

[0050] In this embodiment, a limiting groove is formed on the horizontal fixed surface. The shaft of the positioning shaft 2 and the spring 3 are both placed in the limiting groove to ensure stable movement trajectory. The other end of the positioning shaft 2 is connected to a knurled nut 6 via a thread as an operating handle, facilitating manual adjustment of the position of the positioning shaft 2. The other end of the positioning shaft 2 has an M6 thread, which is threadedly engaged with the knurled nut 6. The knurled nut 6 is a standard part, conforming to ergonomics. By applying tension to the right to compress the spring 3, the workpiece clamping point opens, facilitating the replacement of the measured rotating shaft 7 and improving measurement efficiency. Figure 2As shown, a cover plate 4 is also provided on the shaft of the positioning shaft 2. The cover plate 4 is fastened to the horizontal fixed surface by positioning screws 5, which provides protection and limit the positioning shaft 2 and the spring 3. In this embodiment, the positioning screws 5 can be two screws arranged symmetrically and threaded to the screw holes opened on both sides of the horizontal fixed surface. Of course, multiple screws can also be used. For easy and quick disassembly and assembly, using two screws is the preferred solution.

[0051] The base 1 is made of alloy steel to ensure structural strength. Meanwhile, the right-angled parts of the clamping area of ​​the base 1 (i.e., the horizontal fixing surface and the vertical positioning surface) are machined using slow wire EDM to ensure that their machining accuracy is higher than the measurement accuracy of the workpiece being measured, thus avoiding measurement errors caused by errors in the mechanism's reference. For the telescopic part of the clamping area, i.e., one end of the positioning shaft 2, its bottom surface is flat, allowing for smooth sliding with the base 1. The clamping area has an arc structure (i.e., an arc-shaped groove) that perfectly fits the shaft of the rotating shaft 7 being measured. Before measurement, the entire mechanism is accurately positioned and programmed using an image measuring instrument. During use, only the knurled nut 6 needs to be pulled to disassemble and assemble the rotating shaft 7 being measured for subsequent automatic measurement.

[0052] In another preferred embodiment of this utility model, an anti-slip pad is bonded to the inner wall of the arc-shaped groove of the positioning shaft 2, thereby enhancing the friction during clamping, preventing the rotating shaft 7 from sliding, and effectively avoiding wear on the rotating shaft 7. In addition, the width of the vertical positioning surface is the same as the width of the flat surface of the flat shaft portion of the rotating shaft 7, ensuring a tight fit.

[0053] The auxiliary device for measuring the form and position tolerances of the shaft of the finite angle torque motor provided in this embodiment is manufactured by precision machining methods such as wire EDM, machining center, and CNC lathe, which meets the form and position tolerance requirements of each component and ensures the flexibility of the overall mechanism and the accuracy of measurement after assembly.

[0054] This embodiment provides an auxiliary device for measuring the form and position tolerances of a finite angle torque motor shaft. Its specific working principle is as follows:

[0055] Combination Figures 1 to 3As shown, during measurement, the knurled nut 6 pulls the positioning shaft 2 away from the vertical positioning surface, compressing the spring 3 to store energy. At this time, a clamping space is formed between the positioning shaft 2 and the vertical positioning surface. The flat shaft portion of the rotating shaft 7 is placed into this space, so that the flat surface of the flat shaft fits against the vertical positioning surface. Then, the knurled nut 6 is released, and the spring 3 releases energy due to elastic deformation, pushing the positioning shaft 2 to return axially along the limiting groove until the arc-shaped groove of the positioning shaft 2 fits tightly against the arc-shaped surface of the flat shaft. Thus, the spring force of the spring 3 stably clamps the rotating shaft 7 between the horizontal fixed surface and the vertical positioning surface of the base 1. At this time, the auxiliary device completes the positioning and fixing of the rotating shaft 7, which can be used with measuring tools to accurately measure the form and position tolerances of the rotating shaft. The entire process utilizes the automatic return characteristic of the spring 3 and the matching structure between the positioning shaft 2 and the vertical positioning surface to achieve rapid clamping and stable positioning of the rotating shaft 7, improving measurement efficiency and accuracy.

[0056] In summary, this utility model provides an auxiliary device for measuring the form and position tolerances of a finite angle torque motor shaft, which has the following advantages compared to existing positioning methods:

[0057] The L-shaped right-angle base, along with the positioning shaft and the arc-shaped groove, clamps the flat shaft against the vertical positioning surface, providing a precise quantitative benchmark for measurement and improving accuracy. A limit groove on the horizontal fixed surface ensures stable displacement of the positioning shaft and spring, guaranteeing reliable clamping. The positioning shaft features an operating handle connected with a knurled nut thread, facilitating operation, easy force application, and convenient maintenance. The vertical positioning surface is the same width as the flat surface of the flat shaft, and the inner wall of the arc-shaped groove is fitted with an anti-slip pad, ensuring precise fit and stable positioning of the flat shaft, reducing errors. The positioning shaft body has a snap-fit ​​cover plate connected by positioning screws, protecting internal components and facilitating maintenance. The base is made of alloy steel, offering high strength and wear resistance, extending service life. The spring uses a cylindrical helical compression spring, providing stable performance and uniform elasticity, ensuring reliable reset of the positioning shaft. This auxiliary device enables the entire rotating shaft to be in a stable and suspended state, exposing the two measurement references on the shaft to the visible range, thus achieving accurate acquisition of the measurement references and enabling accurate measurement of the parallelism of the ball's flat surface and the ball's position. This auxiliary device can overcome the problems of poor accuracy caused by manual adjustment in existing technologies, significantly improving measurement accuracy and efficiency, and enhancing the stability and durability of the device.

[0058] The above embodiments are merely one of the implementation methods to achieve the technical solution of this utility model. The scope of protection claimed by this utility model is not limited to this embodiment, but also includes any variations, substitutions and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this utility model.

Claims

1. A limited angle torque motor rotating shaft form tolerance measuring auxiliary device, characterized in that, Including the base (1); The base (1) adopts an L-shaped right-angle structure, including a horizontal fixing surface and a vertical positioning surface; A positioning shaft (2) capable of axial displacement is provided on the horizontal fixed surface. One end of the positioning shaft (2) is provided with an arc-shaped groove, which cooperates with the vertical positioning surface to clamp the flat shaft part of the rotating shaft (7); During the clamping process, the arc-shaped surface of the flat shaft portion fits into the arc-shaped groove, and the flat surface fits into the vertical positioning surface; A spring (3) is fitted on the shaft of the positioning shaft (2); The spring (3) abuts against the positioning shaft (2) and the end of the horizontal fixed surface; When the rotating shaft (7) is clamped, the other end of the positioning shaft (2) is pulled to cause the spring (3) to contract. After the positioning shaft (2) is released, the spring (3) drives the positioning shaft (2) to reset so as to cooperate with the vertical positioning surface and complete the clamping of the rotating shaft (7).

2. The auxiliary device for measuring the form tolerance of the rotation axis of a limited rotation torque motor according to claim 1, wherein A limiting groove is provided on the horizontal fixed surface, and the shaft of the positioning shaft (2) and the spring (3) are both set in the limiting groove.

3. The auxiliary device for measuring form tolerance of a rotary shaft of a limited-rotation torque motor according to claim 1, wherein The other end of the positioning shaft (2) is provided with an operating handle.

4. The auxiliary device for measuring the form tolerance of the rotation axis of a limited rotation torque motor according to claim 3, wherein The operating handle is made of knurled nut (6); the knurled nut (6) is connected to the other end of the positioning shaft (2) by a thread.

5. The auxiliary device for measuring form tolerance of a rotary shaft of a limited-rotation torque motor according to claim 1, wherein The vertical positioning surface has the same width as the flat surface of the flat shaft portion of the rotating shaft (7).

6. The auxiliary device for measuring form tolerance of a rotary shaft of a limited rotation torque motor according to claim 1, wherein An anti-slip pad is bonded to the inner wall of the arc-shaped groove of the positioning shaft (2).

7. The auxiliary device for measuring the form and position tolerances of a finite angle torque motor shaft according to claim 1, characterized in that, A cover plate (4) is provided above the shaft of the positioning shaft (2), and the cover plate (4) is fastened to the horizontal fixed surface.

8. The auxiliary device for measuring the form tolerance of the rotation axis of a limited rotation torque motor according to claim 7, wherein The cover plate (4) is connected to the horizontal fixing surface of the base (1) by positioning screws (5).

9. The auxiliary device for measuring form tolerance of a rotary shaft of a limited rotation torque motor according to claim 1, wherein The base (1) is made of alloy steel.

10. The auxiliary device for measuring form tolerance of a rotary shaft of a limited-rotation torque motor according to claim 1, wherein The spring (3) is a cylindrical helical compression spring.

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