Stator inner cavity three-dimensional profile measuring device

Abstract

The invention relates to the technical field of measurement, and particularly discloses a stator inner cavity three-dimensional profile measuring device, which comprises an insertion positioning piece, a rotating disc, a probe and a displacement sensor, and is characterized in that the rotating disc is rotationally connected to the annular side surface of the insertion positioning piece, a sliding groove is formed in the radial direction of the rotating disc, and one end of the probe is elastically and slidably connected in the sliding groove; and the displacement sensor is in sensing connection with the probe and is used for sensing the sliding displacement of the probe in the sliding chute. The device can conveniently measure the three-dimensional profile of the spiral inner cavity of the stator, and is high in automation and visualization degree.

Description

Technical Field

[0001] This invention relates to the field of measurement technology, specifically a three-dimensional contour measuring device for a stator cavity. Background Technology

[0002] Currently, the industry commonly uses various measuring tools such as disc gauges, large-diameter gauges, digital measuring instruments, and stator profilometers to evaluate the internal profile of stators. While these tools can meet the needs of dimensional measurement to some extent, each has significant limitations. For example, disc gauges and large-diameter gauges can only measure the minor and major diameters of the stator separately, failing to comprehensively reflect the entire profile. Furthermore, the accuracy of interference fit tests is difficult to guarantee due to the instability of the support rod and the operator's skill. Although digital measuring instruments incorporate digital sensors, they are still limited to local dimensional measurements and cannot achieve overall profile measurement. While stator profilometers achieve non-contact measurement through lasers, their complex operation procedures, high costs, and the challenge of converting two-dimensional sections into three-dimensional models limit their widespread adoption in the industry.

[0003] In summary, existing measuring tools have room for improvement in terms of accuracy, speed, comprehensiveness, economy, and applicability. As drilling conditions become increasingly complex and expectations for screw drill bit performance rise, the market urgently needs an innovative solution to meet the customized, high-precision, and rapid-response drill bit configuration requirements of oilfield sites and users. Only by upgrading and optimizing key technologies can drilling tools truly achieve enhanced efficiency and drive technological progress in the industry. Summary of the Invention

[0004] The purpose of this invention is to provide a three-dimensional contour measuring device for stator internal cavity, which can conveniently measure the three-dimensional contour of stator spiral internal cavity, with a high degree of automation and visualization.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A three-dimensional contour measuring device for a stator cavity includes an insertion positioning component, a rotating disk, a probe, and a displacement sensor. The rotating disk is rotatably connected to the annular side of the insertion positioning component. A groove is provided in the radial direction of the rotating disk. One end of the probe is elastically slidably connected in the groove. The displacement sensor is inductively connected to the probe and is used to sense the displacement of the probe sliding in the groove.

[0007] In a further embodiment, the probe includes a first coarse needle and a fine needle. The first coarse needle is used to slide in accordance with the trough of the inner cavity profile of the motor stator. The number of the first coarse needles is adapted to the number of heads of the motor stator. There are multiple fine needles, which are evenly distributed among the first coarse needles.

[0008] In a further embodiment, both the first coarse needle and the fine needle include a ball bearing, a rod, a magnetic ring, a spring, and a connecting shaft. The ball bearing is rotatably connected to one end of the rod, and the magnetic ring is connected to the other end of the rod. The other end of the rod is slidably connected to the groove. A connecting groove is formed on one end of the rod near the groove. One end of the connecting shaft is slidably connected to the connecting groove, and the other end is connected to the displacement sensor. The probe of the displacement sensor is positioned directly opposite the magnetic ring and is fixedly installed in the groove. The spring is elastically connected between the other end of the rod and the displacement sensor.

[0009] In a further embodiment, the displacement sensor is a magnetostrictive displacement sensor.

[0010] In a further embodiment, the insertion positioning element includes a support and an insertion rod, with the support connected to the end of the insertion rod.

[0011] In a further embodiment, the insertion positioning component further includes a second coarse needle and a support disk. The support disk is rotatably connected to the annular side of the insertion rod. There are multiple second coarse needles, each used to slide in accordance with the trough of the inner cavity contour of the motor stator. The multiple second coarse needles are elastically and evenly distributed in the radial direction of the support disk.

[0012] In a further embodiment, the support includes a positioning chuck connected to the end of the insertion rod, and a pull rope passing through the positioning chuck for pulling the rotating disk axially.

[0013] In a further embodiment, the rotating disk is rotatably connected to the insertion rod via a rolling bearing and / or a thrust bearing.

[0014] In a further embodiment, the measuring device also includes an electric push rod, which is used to push the rotating disk to slide along the insertion positioning member.

[0015] In a further embodiment, the measuring device also includes an imaging device electrically connected to a displacement sensor. The imaging device is used to convert the displacement data of the probe relative to the initial point of the center of the motor stator cavity into a contour map of the cavity, and to determine whether the size of the cavity conforms to a preset value based on the displacement data.

[0016] The beneficial effects of this invention are:

[0017] The device of this invention uses a probe to elastically contact the stator's inner cavity contour, i.e., a zero-extrusion contact measurement, avoiding direct contact and effectively reducing potential damage to the stator's inner cavity. This protects the integrity and original state of the object being measured, ensuring the authenticity and reliability of the measurement results. Through the elastic extension and contraction of the probe and the movement of the rotating disk, the linear characteristics of the stator's inner cavity are fed back in real time to a computer or other data processing equipment via a displacement sensor. This enables high-precision three-dimensional contour measurement, and the measured data can be used to monitor whether the inner cavity contour meets the requirements.

[0018] By inserting a positioning element that matches the spiral profile of the stator cavity with the rotating disk, the probe is precisely centered during the measurement process, effectively avoiding errors caused by human operation, thereby significantly improving the reliability and accuracy of the data.

[0019] The zero-extrusion contact measurement structure achieved by using ball bearings and springs is simple, with low friction between the ball bearing and the inner cavity contour, facilitating the movement of the rotating disk. The measuring probe can move smoothly along the axial direction, covering all leads of the stator inner cavity, obtaining complete contour data in one go, and ensuring the continuity and integrity of the line type information.

[0020] The automatic data feedback via displacement sensors results in a high degree of automation, reducing reliance on operator skills and making the measurement process faster and more efficient.

[0021] This measuring device is not only suitable for measuring various stator products, but can also accurately characterize the dynamic changes of stator profile under non-room temperature conditions, providing strong support for the performance evaluation of drilling tools in complex environments.

[0022] The data collected by the displacement sensor can be transmitted to the imaging device, which can instantly generate an intuitive 3D model. This greatly facilitates the analysis and interpretation of measurement results by technicians and promotes the subsequent design optimization and quality control process. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of a three-dimensional contour measuring device for a stator cavity according to the present invention;

[0025] Figure 2 This is a schematic diagram of the connection of the rotating disk in an embodiment of the present invention;

[0026] Figure 3This is a schematic diagram of the probe connection in an embodiment of the present invention;

[0027] In the diagram: 1. Insertion positioning component; 11. Support component; 111. Positioning chuck; 12. Insertion rod; 13. Second coarse needle; 14. Supporting disc; 2. Rotating disc; 201. Slide groove; 3. Probe; 31. Ball bearing; 32. Rod body; 321. Connecting groove; 33. Magnetic ring; 34. Spring; 35. Connecting shaft; 300. First coarse needle; 301. Fine needle; 4. Displacement sensor. Detailed Implementation

[0028] 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.

[0029] like Figure 1 As shown, a three-dimensional contour measuring device for a stator cavity includes an insertion positioning element 1, a rotating disk 2, a probe 3, and so on. Figure 3 The displacement sensor 4 shown has a rotating disk 2 rotatably connected to the ring side of the insertion positioning member 1. A groove 201 is provided in the radial direction of the rotating disk 2. One end of the probe 3 is elastically slidably connected in the groove 201. The displacement sensor 4 is inductively connected to the probe 3 and is used to sense the displacement of the probe 3 sliding in the groove 201.

[0030] Its working principle is as follows, see reference Figure 1 and Figure 3 As shown, by inserting positioning piece 1, the disk and probe 3 are inserted together into the inner cavity of the motor stator. The central axis of the disk is positioned by inserting positioning piece 1 so that it coincides with the central axis of the inner cavity of the motor stator. The probe 3 on the disk slides along the contour of the inner cavity of the motor stator. The displacement sensor 4 on the disk senses the change in the position of the probe 3 relative to the disk during the sliding process, thereby obtaining the distance of the contour relative to the central axis. Thus, the movement trajectory of each probe 3 with the central axis as the base point is constructed. The trajectories are smoothly connected to obtain the contour change data of the inner cavity of the motor stator. This data can be used to determine whether the dimensional change of the inner cavity contour meets the requirements and to depict and construct the inner cavity contour model.

[0031] Based on the above principles, some preferred embodiment structures or implementation methods are provided, such as... Figure 2As shown, probe 3 includes a first coarse needle 300 and a fine needle 301. The first coarse needle 300 is used to slide in match with the troughs of the inner cavity contour of the motor stator. The measurement area of ​​the fine needle 301 is smaller than that of the first coarse needle 300. The number of first coarse needles 300 is equal to the number of heads of the motor stator. There are multiple fine needles 301, evenly distributed among the first coarse needles 300. The first coarse needle 300 can be used at the troughs of the inner cavity contour of the motor stator. Through matching sliding, when the first coarse needle 300 slides along the trough, it can guide the rotating disk 2 to move forward along the insertion rod 12. At the same time, it also guides the fine needle 301 as it moves along the spiral line on the inner cavity contour of the motor stator. Therefore, by detecting the rotation angle of the rotating disk 2, the distance traveled, and the contour change fed back by the displacement sensor 4, the spatial position of each probe 3 can be obtained. Smoothly connecting the positions of each point can obtain the inner cavity contour map. The first coarse needle 300 and the fine needle 301 differ only in size. The coarse needle 300 is designed to ensure the centering of the measurement system, preventing offset or wobbling, thereby guaranteeing measurement accuracy and stability. The fine needle 301, on the other hand, undertakes the actual measurement task. They can enter the fine grooves and complex geometric regions of the stator's inner cavity, capturing detailed features of the inner cavity surface. Due to their smaller diameter, the fine needles 301 can more sensitively react to minute changes on the stator's inner cavity surface, thus obtaining higher-precision measurement data. The number of fine needles 301 can be selected according to the specific characteristics of the stator and the required measurement accuracy to ensure the most complete inner cavity contour information is obtained.

[0032] Therefore, the division of labor between the first coarse needle 300 and the fine needle 301 enables the measurement system to remain stable during the measurement process while capturing all the detailed information, thereby achieving high-precision measurement.

[0033] like Figure 2 The first coarse needle 300 and the fine needle 301 shown both include, as follows: Figure 3The diagram shows a ball bearing 31, a rod 32, a magnetic ring 33, a spring 34, and a connecting shaft 35. The ball bearing 31 is rolledly connected to one end of the rod 32, and the magnetic ring 33 is connected to the other end of the rod 32. The other end of the rod 32 is slidably connected within a groove 201, and a connecting groove 321 is provided on the other end of the rod 32. One end of the connecting shaft 35 is slidably connected within the connecting groove 321, and a displacement sensor 4 is connected to the other end. The probe of the displacement sensor 4 is positioned directly opposite the magnetic ring 33 and is fixedly mounted within the groove 201. The spring 34 is elastically connected between the other end of the rod 32 and the displacement sensor 4. The ball bearing 31 rolls more easily along the inner contour of the motor stator cavity. The rod 32, as a component supporting the ball bearing 31, can elastically slide within the groove 201 via the spring 34, thereby generating a relative sliding displacement with respect to the displacement sensor 4. The ball bearing 31 is used to measure the change in the inner contour of the cavity relative to the center distance. By measuring the change at each point, and using the central axis as a reference, a change graph can be generated.

[0034] Displacement sensor 4 is a magnetostrictive displacement sensor. The magnetostrictive displacement sensor can sense the displacement changes of the magnetic ring 33 from a distance, with high accuracy and small size, making it easy to install in the slide groove 201.

[0035] The insertion positioning component 1 includes a support component 11 and an insertion rod 12, with the support component 11 connected to the end of the insertion rod 12. This allows the insertion rod 12 to be positioned via the support component 11, thereby achieving radial positioning of the rotating disk 2 and forming a radial reference.

[0036] The insertion positioning component 1 also includes a second coarse needle 13 and a support disk 14. The support disk 14 is rotatably connected to the annular side of the insertion rod 12. There are multiple second coarse needles 13, which are elastically and evenly distributed in the radial direction of the support disk 14. The auxiliary function of the second coarse needle 13 is the same as that of the first coarse needle 300, but there may be slight differences in size. When the insertion rod 12 is long, it can provide support for the insertion rod 12 at multiple points, which can make the measurement results more accurate. The displacement sensor 4 can be omitted inside, and it does not have a measurement function, but only an auxiliary support function.

[0037] The support member 11 includes a positioning chuck 111, which is connected to the end of the insertion rod 12. A pull rope passes through the positioning chuck 111 and is used to pull the rotating disk 2 to move axially. The positioning chuck 111 allows the insertion rod 12 to be coaxial with the inner cavity of the stator. The pull rope structure is simple and facilitates the movement of the rotating disk 2. When detecting or checking contour errors, the operation is more convenient and simple, and it is easier to find abnormal points.

[0038] The rotating disk 2 is rotatably connected to the insertion rod 12 via rolling bearings and / or thrust bearings. This reduces friction during the movement of the rotating disk 2, making it easier to move.

[0039] The measuring device also includes an electric actuator, which is used to push the rotating disk 2 to slide along the insertion positioning member 1. The electric actuator simplifies the pushing action. A roller is installed at the front end of the electric actuator to reduce friction. A scale can be added to the electric actuator, and a displacement sensor 4 can be arranged facing the rotating disk 2 to measure the axial depth of the disk entering the stator cavity.

[0040] The measuring device also includes an imaging device electrically connected to the displacement sensor 4. The imaging device converts the displacement data of the probe 3 (equivalent to the initial point of the motor stator cavity center) into an internal cavity profile map, and determines whether the internal cavity profile conforms to preset values ​​based on the displacement data. The main displacement data collected includes dimensional information of various positions within the stator cavity, especially the surface details of the cavity captured by the first coarse needle 300 and the fine needle 301. After processing, this data yields a precise three-dimensional profile of the stator cavity, which helps assess the stator's manufacturing precision, wear condition, or other quality control indicators. The entire process aims to achieve high-precision, fully automated measurement and visualization of the stator cavity profile.

[0041] The imaging equipment mainly includes a data acquisition card, computer, image processing software, graphics card, storage device, input device, and output device. The imaging equipment is also compatible with wireless communication protocols and communicates wirelessly with the displacement sensor 4.

[0042] The aforementioned measuring device is not only suitable for measuring various stator products, but can also accurately characterize the dynamic changes of stator profile under non-room temperature conditions, providing strong support for the performance evaluation of drilling tools in complex environments.

[0043] An additional sleeve structure is added, which is fitted outside the insertion rod 12 and connected to the rotating disk 2. This is used to drive the rotating disk 2 to rotate, and also allows the wire of the displacement sensor to move synchronously, ensuring the stable transmission of the wired sensor signal.

[0044] In some embodiments, the specific implementation may involve positioning the insertion rod 12, which is mounted on the end face of the motor stator by a chuck, positioning the rotating disk 2 by the insertion rod 12, and pushing the sleeve or ball bearing 31 or thrust bearing by an electric push rod. This causes the first coarse needle on the rotating disk 2 to travel along the troughs of the inner cavity contour. During the travel, the ball bearing 31 contacts the contour surface, and the radial movement of the ball bearing 31 drives the magnetic ring 33 to move, thereby inducing an electrical signal on the magnetostrictive displacement sensor. The electrical signal is converted into a displacement signal of the contour relative to the central axis of the inner cavity of the motor stator, thereby measuring the size and position of each part of the contour relative to the central axis. This provides data support for evaluating the manufacturing accuracy, wear condition, inner cavity imaging, or other quality control indicators of the stator.

[0045] In some embodiments, the specific implementation method can also be that, through an external support device, the center line of the insertion positioning member 1, such as the insertion rod 12 or the rotating disk 2, can be directly positioned with the center line of the stator cavity through the center of the cross sections at both ends, or by fitting the center point obtained through several cross sections of the cavity. Then, the rotating disk 2 is pulled on the insertion rod 12 by a rope or the like. During the sliding process, the displacement change is monitored by the mutual sensing between the probe 3 and the displacement sensor 4, thereby quickly finding the damage point.

[0046] This measuring device features a compact overall structure, simple operation, suitability for non-disassembly testing, low cost, high measurement efficiency, and convenient data reading, significantly improving product quality. It is applicable to all aspects of stator production and technology research and development, and has broad market application prospects.

[0047] It should be noted that the terms "first," "second," etc., used in this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein.

[0048] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0049] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A stator bore three-dimensional profile measuring device, characterized by, The utility model provides a kind of motor stator inner cavity contour measuring device, including insertion positioning piece (1), rotating disc (2), probe (3) and displacement sensor (4), the rotating disc (2) is rotationally connected on the ring side surface of the insertion positioning piece (1), the radial direction of the rotating disc (2) is provided with sliding slot (201), one end of the probe (3) is elastically connected in sliding slot (201), and the displacement sensor (4) is inductively connected with the probe (3), for inducting the displacement of the probe (3) sliding in sliding slot (201).

2. A stator bore three-dimensional profile measuring apparatus according to claim 1, wherein The probe (3) includes a first thick needle (300) and a thin needle (301), the first thick needle (300) is used to match the trough of the motor stator inner cavity contour and slide, the number of the first thick needle (300) is adapted to the number of the motor stator, and the thin needle (301) is multiple and equally distributed between the first thick needles (300).

3. A stator bore three-dimensional profile measuring apparatus according to claim 2, wherein, The first thick needle (300) and the thin needle (301) each include a ball (31), a rod body (32), a magnetic ring (33), a spring (34) and a connecting shaft (35), the ball (31) is rollingly connected to one end of the rod body (32), the magnetic ring (33) is connected to the other end of the rod body (32), the other end of the rod body (32) is slidably connected in the sliding slot (201), a connecting groove (321) is formed in the end of the rod body (32) close to the sliding slot, one end of the connecting shaft (35) is slidably connected in the connecting groove (321), the other end of the connecting shaft (35) is connected with the displacement sensor (4), the probe of the displacement sensor (4) is opposite to the magnetic ring (33) and is fixedly arranged in the sliding slot (201), and the spring (34) is elastically connected between the other end of the rod body (32) and the displacement sensor (4).

4. A stator bore three-dimensional profile measuring apparatus according to claim 3, wherein The displacement sensor (4) is a magnetostrictive displacement sensor.

5. A stator bore three-dimensional profile measurement device according to claim 1, wherein, The insertion positioning piece (1) includes a support (11) and an insertion rod (12), the support (11) is connected to the end of the insertion rod (12).

6. A stator bore three-dimensional profile measuring apparatus according to claim 5, wherein, The insertion positioning piece (1) further includes a second thick needle (13) and a support disc (14), the support disc (14) is rotationally connected to the ring side surface of the insertion rod (12), the second thick needle (13) is multiple and is used to match the trough of the motor stator inner cavity contour and slide, and the multiple second thick needles (13) are elastically and uniformly arranged in the radial direction of the support disc (14).

7. A stator bore three-dimensional profile measuring apparatus according to claim 5, wherein The support (11) includes a positioning chuck (111), the positioning chuck (111) is connected to the end of the insertion rod (12), a pull rope is arranged through the positioning chuck (111), and the pull rope is used to pull the rotating disc (2) to move axially.

8. A stator bore three-dimensional profile measuring apparatus according to claim 5, wherein, The rotating disc (2) is rotationally connected to the insertion rod (12) through a rolling bearing and / or a thrust bearing.

9. A stator bore three-dimensional profile measuring apparatus according to claim 1, wherein, The measuring device further includes an electric push rod, and the electric push rod is used to push the rotating disc (2) to slide along the insertion positioning piece (1).

10. A stator bore three-dimensional profile measurement device according to claim 1, wherein, The measuring device further comprises an imaging device electrically connected with the displacement sensor (4), the imaging device being used to convert the displacement data of the probe (3) relative to the initial point of the center of the inner cavity of the motor stator into a profile map of the inner cavity, and determine whether the size of the inner cavity meets the preset value according to the displacement data.

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