Automatic press-fitting test mechanism for pump stator and rotor

Abstract

The invention discloses an automatic press-fitting testing mechanism for a pump stator and a pump rotor, and belongs to the technical field of automatic assembling and testing. The mechanism comprises a rack, and a material positioning module, a movable conveying module, a material taking and carrying module, a centering press-fitting module and a combined-fitting testing module which are arranged on the rack. The material positioning module is provided with a tool base used for placing a pump body and a rotor. The centering press-fitting module comprises a lower jacking unit and an upper press-fitting unit which are coaxially arranged in an aligned mode and used for clamping and centering the upper end and the lower end of a pump body at the same time so as to overcome deviation caused by magnetic adsorption, and an elastic pressing head used for adsorbing and pressing in a pump cover is arranged at the tail end of the upper press-fitting unit. And the combined test module comprises a detection unit, a rotation driving unit and a torque sensor, and is used for carrying out electrical and mechanical performance comprehensive test on the assembled component. Full-automatic centering press-fitting and online detection of the pump body, the rotor and the pump cover are achieved, and the full-automatic centering press-fitting machine has the advantages of being high in assembly precision, high in adaptability, controllable in quality, high in production efficiency and the like.

Description

Technical Field

[0001] This invention belongs to the field of automated assembly and testing technology, and specifically relates to an automatic press-fitting and testing mechanism for pump stators and rotors. Background Technology

[0002] In the manufacturing process of precision fluid machinery such as micro pumps and hydraulic pumps, the assembly accuracy and performance consistency of the stator and rotor assemblies directly affect the final quality and reliability of the product. Currently, the industry generally uses manual or semi-automatic methods for rotor press-fitting and testing, which suffers from problems such as low alignment accuracy, insufficient assembly efficiency, susceptibility to magnetic interference leading to positional deviation, and difficulty in achieving online performance testing. Especially for pump products with permanent magnet rotors, the strong magnetic attraction between the rotor and stator makes it extremely easy for rotor tilting or inaccurate positioning to occur during traditional press-fitting processes, leading to defects such as poor assembly, operational jamming, or decreased efficiency.

[0003] While some existing automated equipment can perform a single press-fit function, most lack effective alignment and calibration mechanisms and integrated testing modules. This prevents them from completing a closed-loop "press-fit-test" process on a single fixture, leading to fragmented processes, extended cycle times, and difficulties in quality traceability. Therefore, there is an urgent need for a fully automated assembly equipment that integrates high-precision alignment, flexible press-fitting, and online performance testing to improve assembly quality, production efficiency, and product consistency. Summary of the Invention

[0004] This invention aims to provide an automatic press-fitting and testing mechanism for pump stators and rotors. Through integrated design, it realizes fully automatic precision assembly and online testing of pump body, rotor and pump cover. Specifically, by using a lower lifting unit and an upper press-fitting unit coaxially arranged in the centering press-fitting module, clamping and centering correction are carried out simultaneously from the upper and lower ends of the pump body, effectively overcoming the rotor offset problem caused by magnetic adsorption, thereby ensuring the coaxiality and positional accuracy of the assembly process.

[0005] The present invention adopts the following technical solution: An automatic press-fitting and testing mechanism for pump stators and rotors includes a frame and a material positioning module, a moving conveying module, a material handling module, an alignment and press-fitting module, and an assembly and testing module mounted thereon. The material positioning module is provided with a tooling base for placing the pump body and rotor. The alignment and press-fitting module includes a lower lifting unit and an upper press-fitting unit coaxially aligned for simultaneously clamping and centering the pump body from both the upper and lower ends to overcome the offset caused by magnetic adsorption. The upper press-fitting unit is provided with an elastic pressure head at its end for adsorbing and pressing the pump cover.

[0006] This invention integrates a material positioning module, a moving conveying module, a material handling module, a centering and pressing module, and an assembly and testing module onto a single frame. This achieves fully automated operation from pump body and rotor loading and positioning, conveying, handling, centering and pressing to performance testing, significantly improving assembly efficiency and production cycle time, and enabling automatic continuous production. Specifically, the centering and pressing module, through its coaxially aligned lower lifting unit and upper pressing unit, can simultaneously center and clamp the pump body from both ends, effectively overcoming the misalignment problem caused by the magnetic attraction between the rotor and the pump body. This ensures coaxiality and accuracy during assembly, solving the centering problem in traditional pressing processes. Simultaneously, the upper pressing unit has an elastic pressure head at its end for adsorbing and pressing the pump cover. This structure not only achieves reliable adsorption and automatic pressing of the pump cover but also adapts to assembly tolerances through its elastic floating design, avoiding damage to parts that may be caused by rigid pressing, further improving assembly quality and reliability.

[0007] Specifically, the assembled test module includes a detection unit, a rotary drive unit for driving the rotor to rotate, and a torque sensor. The detection unit is equipped with a probe for electrically connecting to the pump body and a voltage sensor electrically connected to the probe. The detection unit includes a liftable probe holder and at least two probes mounted thereon. The probe holder is driven by a cylinder or servo motor, causing the probes to contact the test contacts on the pump body to form a current test circuit.

[0008] The assembly test module of this invention includes a detection unit, a rotation drive unit, and a torque sensor, realizing automated performance testing and quality judgment of the assembled product. Through probes and voltage sensors, an electrical test circuit can be automatically constructed after assembly to detect the product's electrical parameters in real time. Combined with the torque sensor's monitoring of the rotor's mechanical performance during rotation, this allows for a comprehensive evaluation of assembly quality. Furthermore, the probe holder is height-adjustable, ensuring reliable contact between the probe and the test contacts on the pump body, enhancing test stability and repeatability. This design not only enables quantitative detection of mechanical properties such as rotor jamming and normal rotational resistance, but also allows for the measurement of electrical parameters such as back electromotive force through the voltage sensor. This comprehensive assessment of key indicators such as rotor coaxiality and magnetic circuit symmetry allows for effective quality control during the assembly process, significantly reducing defect rates in subsequent processes and improving overall product reliability and consistency.

[0009] Specifically, the mobile conveying module has a reciprocating linear displacement function, which can accurately convey and precisely position the material positioning module carrying the pump body and rotor sequentially to the material picking position, pressing position, and testing position, realizing orderly flow and precise positioning between each workstation and providing basic conveying guarantee for full-process automation. Simultaneously, the material picking and handling module controls the grippers to perform gripping and transfer operations through drive components, stably gripping the rotor and reliably transferring it between workstations. Furthermore, the grippers have a vertical lifting function, enabling the mobile conveying module to switch the position of the material module in the horizontal direction, and the grippers to precisely place the rotor in the vertical direction. Through coordinated operation in both directions, the stability and positioning accuracy of the rotor picking and placing process are ensured, while avoiding motion interference between modules, thus improving the overall coordination and operational efficiency of the mechanism.

[0010] Specifically, the elastic pressure head includes a mounting base, a suction cup, and an elastic element. The suction cup is connected to the mounting base via the elastic element, enabling the suction cup to have axial floating compensation capability during pump cover pressing. This structure not only stably adsorbs the pump cover using the suction cup but also adaptively adjusts the pressing force and displacement using the elastic element. This effectively absorbs axial errors caused by part machining tolerances or assembly misalignment deviations, avoiding problems such as pump cover damage, uneven sealing surface pressing, or excessive assembly stress that may occur with rigid pressing. Thus, while ensuring pressing reliability, it improves assembly quality and product consistency.

[0011] Specifically, the frame is also equipped with a displacement sensor to detect the axial position of the rotor after press-fitting. This detection mechanism provides important closed-loop feedback information for the assembly process, which not only helps to detect press-fitting abnormalities in a timely manner, but also provides data support for optimizing process parameters, thereby controlling assembly quality.

[0012] An automatic press-fit testing method for pump stator and rotor includes the following steps: S1. Place the pump body and rotor on the tooling base of the material positioning module respectively, and transfer the material positioning module to the material picking position by the moving conveying module; S2. At the material handling station, the material handling module grabs the rotor, and the moving conveyor module transfers the material positioning module to the pressing station; S3. At the pressing position, the material handling module places the rotor into the pump body, and the lower lifting unit and the upper pressing unit of the centering pressing module clamp the pump body from the upper and lower ends and perform centering correction. The elastic pressure head at the end of the upper pressing unit presses the pump cover onto the pump body. S4. The mobile conveyor module will transport the pressed components to the test position along with the material positioning module; S5. Use a displacement sensor to detect the axial position of the rotor after press-fitting, in order to help determine whether the press-fitting is in place; S6. At the test position, control the assembly test module to form a current test circuit, drive the rotor to rotate, and use a torque sensor to detect the rotation torque to determine whether there is jamming. Use a voltage sensor to detect the back electromotive force to evaluate the assembly quality.

[0013] The core advantage of this invention lies in the fact that the automatic pump stator and rotor pressing and testing mechanism provided by this invention achieves fully automatic assembly and integrated testing of the pump body, rotor, and pump cover through the integration and coordination of various functional modules. This mechanism, through the combination of a material positioning module, a moving conveying module, a material handling module, a centering and pressing module, and a combined assembly and testing module, achieves full automation from material loading, handling, pressing to testing, significantly improving production cycle time and operational continuity, and is suitable for large-scale, high-cycle production scenarios. In particular, the coaxially arranged lower lifting unit and upper pressing unit in the centering and pressing module achieve synchronous clamping and centering correction from both ends of the pump body, effectively overcoming the misalignment problem caused by magnetic adsorption between the rotor and the pump body, ensuring the coaxiality and positional accuracy of the assembly. The elastic pressure head at the end of the upper pressing unit has axial floating compensation capability, which can adapt to part tolerances, achieving stable and damage-free pump cover pressing, further improving the consistency and reliability of the assembly. Simultaneously, the assembly and testing module establishes an electrical connection with the pump body through a liftable probe structure. Combined with a rotary drive unit and torque sensor, it can comprehensively test the mechanical performance and electrical parameters of the assembled components, determine in real time whether the rotor is stuck or whether the rotational resistance is normal, and detect the back electromotive force through a voltage sensor to comprehensively evaluate the assembly quality, achieving traceability and real-time feedback of the process quality. The mobile conveying module realizes the precise positioning and orderly flow of materials between each workstation. The material handling module completes the smooth picking and placing of the rotor through coordinated vertical and horizontal movements. The movements of each module are coordinated and do not interfere with each other, and the overall system operates stably and reliably. This mechanism adopts a modular design, has good process adaptability and scalability, and can be quickly adjusted and configured according to different product types, supporting the flexible production needs of multiple varieties and small batches. This invention significantly improves the consistency, reliability, and yield of product assembly through precise mechanical structure and closed-loop control. It has significant advantages in improving assembly accuracy, ensuring product quality, and achieving efficient automated production, and is suitable for high-quality, large-scale assembly and testing applications of various pump body products. Attached Figure Description

[0014] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0015] Figure 1 This is a perspective view of an automatic press-fitting and testing mechanism for pump stator and rotor according to the present invention.

[0016] Figure 2 This is a schematic diagram of the material positioning module described in Embodiment 1.

[0017] Figure 3 This is a front view of an automatic press-fitting and testing mechanism for pump stators and rotors according to the present invention.

[0018] Figure 4 This is a schematic diagram of the centering press-fit module described in Embodiment 1.

[0019] Figure 5 This is a schematic diagram of the assembled test module described in Example 1.

[0020] Figure descriptions: 1-Material positioning module; 11-Pump body; 12-Pump cover; 13-Rotor; 2-Mobile conveying module; 3-Material handling module; 4-Centering and pressing module; 41-Lower lifting unit; 42-Upper pressing unit; 5-Assembly and testing module; 51-Detection unit; 52-Rotation drive unit; 53-Torque sensor. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] The concepts involved in this application will first be described with reference to the accompanying drawings. It should be noted that the following descriptions of various concepts are only for the purpose of making the content of this application easier to understand and do not constitute a limitation on the scope of protection of this application; furthermore, the embodiments and features in the embodiments of this application can be combined with each other unless otherwise specified. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] Example 1 See Figures 1-3 An automatic press-fit testing mechanism for pump stators and rotors includes a frame and a material positioning module 1, a moving conveying module 2, a material handling module 3, a centering press-fitting module 4, and an assembly testing module 5 mounted thereon; the material positioning module 1 is provided with a tooling base for placing the pump body 11 and the rotor 13; see also Figure 4The centering and pressing module 4 includes a lower lifting unit 41 and an upper pressing unit 42 arranged coaxially and aligned, which are used to clamp and center the pump body 11 from both the upper and lower ends at the same time to overcome the offset caused by magnetic adsorption. The upper pressing unit 42 is provided with an elastic pressure head at its end for adsorbing and pressing into the pump cover 12.

[0024] This invention integrates a material positioning module 1, a moving conveying module 2, a material handling module 3, a centering and pressing module 4, and an assembly and testing module 5 onto a single frame. This achieves fully automated operation from material positioning, conveying, material handling, centering and pressing of the pump body 11 and rotor 13 to performance testing, significantly improving assembly efficiency and production cycle time, and enabling automatic continuous production. In particular, the centering and pressing module 4, through its coaxially aligned lower lifting unit 41 and upper pressing unit 42, can simultaneously center and clamp the pump body 11 from both the upper and lower ends, effectively overcoming the offset problem caused by the magnetic attraction between the rotor 13 and the pump body 11, ensuring coaxiality and accuracy during assembly, and solving the centering problem in traditional pressing processes. Meanwhile, the upper pressing unit 42 is provided with an elastic pressure head at its end for adsorbing and pressing the pump cover 12. This structure not only realizes the reliable adsorption and automatic pressing of the pump cover, but also adapts to the assembly tolerance through the elastic floating design, avoiding the damage to parts that may be caused by rigid pressing, and further improving the assembly quality and reliability.

[0025] See Figure 5 The assembled test module 5 includes a detection unit 51, a rotation drive unit 52 for driving the rotor 13 to rotate, and a torque sensor 53. The detection unit 51 is equipped with a probe for electrically connecting to the pump body 11 and a voltage sensor electrically connected to the probe. The detection unit 51 includes a liftable probe holder and at least two probes mounted thereon. The probe holder is driven by a cylinder or servo motor to make the probes contact the test contacts on the pump body 11 to form a current test circuit.

[0026] The assembly test module 5 of this invention includes a detection unit 51, a rotation drive unit 52, and a torque sensor 53, realizing automated performance testing and quality judgment of the assembled product. Through probes and voltage sensors, an electrical test circuit can be automatically constructed after assembly to detect the electrical parameters of the product in real time. Combined with the torque sensor 53 monitoring the mechanical performance of the rotor 13 during rotation, this allows for a comprehensive evaluation of the assembly quality. Furthermore, the probe holder is height-adjustable, ensuring reliable contact between the probe and the test contacts on the pump body 11, enhancing the stability and repeatability of the test. This design not only achieves quantitative detection of mechanical performance such as whether the rotor 13 is stuck or whether the rotational resistance is normal, but also measures electrical parameters such as the back electromotive force through the voltage sensor, comprehensively judging key indicators such as the coaxiality and magnetic circuit symmetry of the rotor 13 assembly. This allows for effective quality control during the assembly process, significantly reducing the defect rate in subsequent processes and improving the overall reliability and consistency of the product.

[0027] The mobile conveying module 2 has a reciprocating linear displacement function, which can accurately convey and precisely position the material positioning module 1 carrying the pump body 11 and rotor 13 sequentially to the material picking position, pressing position, and testing position, realizing orderly flow and precise positioning between each workstation and providing basic conveying guarantee for full-process automation. At the same time, the material picking and handling module 3 controls the gripper to perform gripping and transfer operations through the drive component, which can stably grip the rotor 13 and reliably transfer it between workstations. Furthermore, the gripper has a vertical lifting function, realizing that the mobile conveying module 2 completes the position switching of the material module in the horizontal direction, and the gripper performs precise placement of the rotor in the vertical direction. Through the coordinated operation in two directions, the stability and positioning accuracy of the rotor picking and placing process are ensured, and the motion interference between the modules is avoided, thus improving the overall coordination of the mechanism operation and the work efficiency.

[0028] The elastic pressure head includes a mounting base, a suction cup, and an elastic element. The suction cup is connected to the mounting base via the elastic element, enabling the suction cup to have axial floating compensation capability when pressing the pump cover 12. This structure not only stably adsorbs the pump cover through the suction cup but also adaptively adjusts the pressing force and displacement through the elastic element. This effectively absorbs axial errors caused by part machining tolerances or assembly misalignment deviations, avoiding problems such as pump cover damage, uneven sealing surface pressing, or excessive assembly stress that may occur with rigid pressing. Thus, while ensuring pressing reliability, it improves assembly quality and product consistency.

[0029] The frame is also equipped with a displacement sensor to detect the axial position of rotor 13 after press-fitting. This detection mechanism provides important closed-loop feedback information for the assembly process, which not only helps to detect press-fitting abnormalities in a timely manner, but also provides data support for optimizing process parameters, thereby controlling assembly quality.

[0030] An automatic press-fit testing method for pump stator and rotor includes the following steps: S1. Place the pump body 11 and rotor 13 on the tooling base of the material positioning module 1 respectively, and transfer the material positioning module 1 to the material picking position through the moving conveying module 2; S2. At the material handling position, the material handling module 3 grabs the rotor 13, and the moving conveying module 2 transfers the material positioning module 1 to the pressing position. S3. In the pressing position, the material handling module 3 places the rotor 13 inside the pump body 11, and the lower lifting unit 41 and the upper pressing unit 42 of the centering pressing module 4 clamp the pump body 11 from the upper and lower ends and perform centering correction. The elastic pressure head at the end of the upper pressing unit 42 presses the pump cover 12 onto the pump body 11. S4. The mobile conveyor module 2 will transport the pressed components together with the material positioning module 1 to the test position; S5. Use a displacement sensor to detect the axial position of the rotor 13 after press-fitting, in order to help determine whether the press-fitting is in place; S6. At the test position, control the assembly test module 5 to form a current test circuit, drive the rotor 13 to rotate, and use the torque sensor 53 to detect the rotation torque to determine whether there is jamming. Use the voltage sensor to detect the back electromotive force to evaluate the assembly quality.

[0031] The embodiments and / or implementation methods described above are merely preferred embodiments and / or implementation methods for implementing the technology of the present invention, and are not intended to limit the implementation methods of the technology of the present invention in any way. Any person skilled in the art may make some modifications to other equivalent embodiments without departing from the scope of the technical means disclosed in the content of the present invention, but these should still be regarded as the technology or embodiments that are substantially the same as the present invention.

[0032] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. The above descriptions are only preferred embodiments of this application. It should be noted that due to the limitations of written expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of this application.

Claims

1. An automatic press-fitting and testing mechanism for pump stator and rotor, characterized in that, The system includes a frame and a material positioning module (1), a moving conveying module (2), a material handling module (3), a centering and pressing module (4), and a test assembly module (5) mounted on it. The material positioning module (1) is provided with a tooling base for placing the pump body (11) and the rotor (13). The centering and pressing module (4) includes a lower lifting unit (41) and an upper pressing unit (42) arranged coaxially and aligned, which are used to clamp and center the pump body (11) from both the upper and lower ends at the same time to overcome the offset caused by magnetic adsorption. The upper pressing unit (42) is provided with an elastic pressure head at the end for adsorbing and pressing the pump cover (12).

2. The automatic press-fitting and testing mechanism for pump stator and rotor according to claim 1, characterized in that, The assembly test module (5) includes a detection unit (51), a rotary drive unit (52) for driving the rotor (13) to rotate, and a torque sensor (53). The detection unit (51) is provided with a probe for electrically connecting to the pump body (11) and a voltage sensor electrically connected to the probe.

3. The automatic press-fitting and testing mechanism for pump stator and rotor according to claim 2, characterized in that, The detection unit (51) includes a liftable probe holder and at least two probes mounted thereon. The probe holder is driven by a cylinder or servo motor so that the probes contact the test contacts on the pump body (11) to form a current test circuit.

4. The automatic press-fitting and testing mechanism for pump stator and rotor according to claim 1, characterized in that, The mobile conveying module (2) has a reciprocating linear displacement function, which is used to sequentially convey and position the material positioning module (1) at the material picking position, pressing position and testing position.

5. The automatic press-fitting and testing mechanism for pump stator and rotor according to claim 1, characterized in that, The material handling module (3) includes a drive component and a gripper mounted on the drive end of the drive component for gripping and transferring the rotor (13).

6. The automatic press-fitting and testing mechanism for pump stator and rotor according to claim 5, characterized in that, The gripper can move up and down in the vertical direction; in the first direction of horizontal movement, the moving conveying module (2) conveys the material positioning module (1) to a predetermined position; in the second direction of vertical movement, the gripper places the rotor (13) on the pump body (11).

7. The automatic press-fitting and testing mechanism for pump stator and rotor according to claim 1, characterized in that, The elastic pressure head includes a mounting base, a suction cup, and an elastic element; the suction cup is connected to the mounting base through the elastic element, so that the suction cup has axial floating compensation capability when pressing the pump cover (12).

8. The automatic press-fitting and testing mechanism for pump stator and rotor according to claim 1, characterized in that, The frame is also equipped with a displacement sensor to detect the axial position of the rotor (13) after it has been press-fitted.

9. An automatic press-fitting test method for pump stator and rotor, employing the automatic press-fitting test mechanism for pump stator and rotor as described in any one of claims 1 to 8, characterized in that, Includes the following steps: S1. Place the pump body (11) and rotor (13) on the tooling base of the material positioning module (1) respectively, and transfer the material positioning module (1) to the material picking position through the moving conveying module (2); S2. At the material picking position, the material picking and handling module (3) grabs the rotor (13), and the moving conveying module (2) transfers the material positioning module (1) to the pressing position; S3. At the pressing position, the material handling module (3) places the rotor (13) inside the pump body (11), and the lower lifting unit (41) and upper pressing unit (42) of the centering pressing module (4) clamp the pump body (11) from the upper and lower ends and perform centering correction. The elastic pressure head at the end of the upper pressing unit (42) presses the pump cover (12) onto the pump body (11). S4. The mobile conveyor module (2) transports the pressed components together with the material positioning module (1) to the test position; S5. At the test position, control the assembly test module (5) to form a current test circuit, drive the rotor (13) to rotate, and use the torque sensor (53) to detect the rotation torque to determine whether there is jamming. Use the voltage sensor to detect the back electromotive force to evaluate the assembly quality.

10. The automatic press-fitting test method for pump stator and rotor according to claim 9, characterized in that, Between steps S4 and S5, there is also a press-fit displacement detection step: using a displacement sensor to detect the axial position of the rotor (13) after press-fitting, in order to help determine whether the press-fitting is in place.

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