Confined space rotary scanning probe device with replaceable probe rod

Abstract

The invention relates to the technical field of precision measurement, and discloses a probe rod replaceable restricted space rotary scanning probe device, which comprises a probe rod and a motor for driving the probe rod to rotate, the motor is a hollow motor, an optical signal penetrates through the hollow motor through an optical fiber and penetrates out of one end of the probe rod to measure a space sample, and the probe rod is provided with a replaceable probe rod. An output shaft of the hollow motor drives the probe rod to rotate through a flexible connecting piece, the probe rod is installed on the flexible connecting piece in a pluggable and replaceable mode, and a radial restraining piece used for limiting radial run-out of the probe rod in the rotating process is arranged outside the probe rod. According to the invention, the probe rod does not need to be clamped by a clamp and is easy to replace; and non-contact measurement is adopted, so that the surface of an important part is not damaged, and the external diameter and the morphology with limited space are easy to measure.

Description

Technical Field

[0001] The invention relates to the technical field of precision measurement, in particular to a limited space rotating scanning probe device with a replaceable probe rod. Background Art

[0002] The probe is one of the key components of the precision measurement system. Its manufacturing and development level directly affects the accuracy and efficiency of the measurement system. At present, the most widely used probe in the industrial field is the contact probe. Its principle is to use a position sensor to detect the change in the vector direction when the probe contacts the workpiece to obtain the surface position data of the part.

[0003] For example, the scanning probe in the three-dimensional (3D) digital scanning probe for gear measurement center with patent publication number CN107289888A is composed of three motion units through three leaf spring frame mechanisms to control the movement of the probe along the X, Y and Z axes, and then read the vector direction of the probe ball center in each coordinate axis through the internal position sensor, the scanning probe contacts the surface of the part, and the vector position signal of the moving point is collected by the position sensor at regular intervals. The position sensor is usually a universal high-precision incremental grating position sensor, so as to realize multi-axis scanning and other measurement work. In this method, in the scanning process, the probe always moves along the curved surface in most cases, and the speed and direction of movement always change, so there are always acceleration and inertial force, which makes the probe work under variable load, which is easy to cause measurement errors.

[0004] In addition, if there is a deep hole in the part and the probe cannot perform scanning movement in the deep hole, the morphology of the deep hole cannot be detected. In addition, although the single-light source one-dimensional laser scanning probe with patent publication number: CN106289063A proposes to measure the deformation of the measuring rod by combining a laser light source with optical components to improve the measurement accuracy. However, this method does not improve the problem of being unable to detect tiny deep holes. It is worth mentioning that this contact probe cannot be used for measurement work in confined spaces such as human blood vessels, eyes, teeth, etc., which are easily damaged surfaces. Summary of the invention

[0005] 1. Technical issues to be solved

[0006] In view of the deficiencies of the prior art, the present invention provides a confined space rotating scanning probe device with a replaceable probe rod, which solves the problem that the existing contact probe cannot be used for measurement work on easily damaged surfaces and in confined spaces.

[0007] (II) Technical solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0009] A confined space rotating scanning probe device with a replaceable probe rod comprises a probe rod and a motor for driving the probe rod to rotate, wherein the motor is a hollow motor, and an optical signal passes through the hollow motor via an optical fiber and out from one end of the probe rod to measure the space, and the output shaft of the hollow motor drives the probe rod to rotate via a flexible connecting piece, and the probe rod is installed on the flexible connecting piece in a pluggable and replaceable manner, and a radial constraint member is provided on the outside of the probe rod for limiting radial runout during the rotation of the probe rod.

[0010] Preferably, the flexible connector includes a coupling fixedly connected to the output shaft of the hollow motor and a locking sleeve, the coupling is connected to the locking sleeve via a flexible member, and the probe rod is inserted into the inner hole of the locking sleeve and is locked and fixed.

[0011] Preferably, a plurality of locking holes are arranged in an annular shape on the locking sleeve, and the locking holes cooperate with screws to squeeze and fix the probe rod.

[0012] Preferably, one end of the hollow motor is fixedly connected to a first shell, a stator end collimator is fixedly connected to the inner cavity of the first shell, an end of the stator end collimator away from the first shell is connected to a first optical fiber connector through an optical fiber, an armored outer sheath is arranged on the outside of the optical fiber connecting the stator end collimator and the first optical fiber connector, and a rotor end collimator matching the stator end collimator is fixed on the output shaft of the hollow motor.

[0013] Preferably, a second optical fiber connector is fixedly connected to the coupling, and a third optical fiber connector is fixedly connected to the end of the second optical fiber connector away from the coupling. The optical signal transmitted through the inner cavity of the hollow motor is finally emitted from one end of the probe rod via the optical fiber cooperating with the second optical fiber connector and the third optical fiber connector.

[0014] Preferably, a pigtail is fixedly connected to the inner cavity of the probe rod, and a collimating lens and a reflecting prism are arranged in sequence on the same axis as the pigtail. A light exit hole matching the reflecting prism is opened on the probe rod, and the optical signal emitted from one end of the pigtail passes through the collimating lens and the reflecting prism in sequence, and is emitted from the probe rod through the light exit hole.

[0015] Preferably, the outer sleeves of the pigtail and the collimating lens are fixedly connected with a mounting sleeve, and the mounting sleeve is fixedly connected to the inner cavity of the probe rod. The probe rod is provided with symmetrically arranged mounting holes, and the mounting holes cooperate with screws to squeeze and fix the mounting sleeve.

[0016] Preferably, one end of the hollow motor is fixedly connected to a second outer shell, the second outer shell cover is arranged outside the flexible connector and does not contact the flexible connector, the radial constraint is fixedly arranged in the inner cavity of the second outer shell, and the probe rod passes through the second outer shell away from one end of the hollow motor.

[0017] (III) Beneficial effects

[0018] The present invention has the following beneficial effects:

[0019] The limited space rotating scanning probe device with replaceable probe rod of the present invention can be designed to be very small, which is convenient for measuring narrow spaces; at the same time, it is convenient for daily replacement of the probe rod, and no clamp is required to clamp and install the probe rod, so the probe rod is easy to replace; non-contact measurement will not damage the surface of important parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of the present invention after the first shell and the second shell are disassembled;

[0022] Figure 3 It is a schematic diagram of the cross-sectional structure of the present invention;

[0023] Figure 4 This is a schematic diagram of the installation structure of the locking sleeve and the coupling of the present invention;

[0024] Figure 5 It is a schematic diagram of the cross-sectional structure of the probe rod of the present invention;

[0025] Figure 6 It is a schematic diagram of the disassembled structure of the inner cavity components of the probe rod of the present invention.

[0026] In the figure: 1. hollow motor; 2. rotor end collimator; 3. first shell; 4. stator end collimator; 5. armored outer protection; 6. first fiber optic connector; 7. flexible connector; 71. coupling; 72. flexible part; 73. locking sleeve; 74. locking hole; 8. probe rod; 81. pigtail; 82. collimating lens; 83. mounting sleeve; 84. reflecting prism; 85. light output hole; 86. mounting hole; 9. radial constraint; 10. second shell; 11. second fiber optic connector; 12. third fiber optic connector. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] See also Figure 1 The present invention provides a technical solution: a confined space rotary scanning probe device with a replaceable probe rod, comprising a probe rod 8 and a motor for driving the probe rod 8 to rotate, wherein the motor is a hollow motor 1, and the optical signal passes through the hollow motor 1 through the optical fiber and passes out from one end of the probe rod 8 to measure the space sample, and the output shaft of the hollow motor 1 drives the probe rod 8 to rotate through the flexible connector 7, and the probe rod 8 is installed on the flexible connector 7 in a pluggable and replaceable manner, and a radial constraint 9 is provided on the outside of the probe rod 8 to limit the radial runout during the rotation of the probe rod 8. The present invention can be designed to be very small, which is convenient for measuring narrow spaces. In actual application, the outer diameter of the probe rod can be processed to be very small (conventional outer diameter 3-6mm), and the length is long, which can well adapt to the measurement of samples in narrow spaces; at the same time, it is convenient to replace the probe rod 8 on a daily basis, and there is no need for a clamp to clamp and install the probe rod 8, so it is not easy to be damaged; non-contact measurement will not damage the surface of important parts.

[0029] Reference Figure 4 As shown, in this embodiment, the flexible connector 7 includes a coupling 71 and a locking sleeve 73 fixedly connected to the output shaft of the hollow motor 1. The coupling 71 is connected to the locking sleeve 73 through a flexible member 72, and the probe rod 8 is inserted into the inner hole of the locking sleeve 73 and is locked and fixed. The locking and fixing of the probe rod 8 is completed by cooperating with the locking sleeve 73, which can facilitate the disassembly and replacement of the probe rod 8 in the subsequent process. At the same time, the flexible connector 7 is used to drive the probe rod 8 to rotate. Since the probe rod 8 is directly connected to the coupling 71 during the traditional installation of the probe rod 8, and this installation method is a rigid connection, if the concentricity of the coupling 71 and the probe rod 8 is not good, it is easy to cause the transmission data to jam during the rotation measurement, and also affect the runout. The flexible connector 7 here is similar to a fork structure, which can avoid the phenomenon of signal transmission jamming due to poor concentricity as much as possible.

[0030] In this embodiment, a plurality of locking holes 74 are arranged in an annular shape on the locking sleeve 73 , and the locking holes 74 cooperate with screws to squeeze and fix the probe rod 8 .

[0031] Reference Figure 2 and 3As shown, in this embodiment, one end of the hollow motor 1 is fixedly connected to the first housing 3, the inner cavity of the first housing 3 is fixedly connected to the stator end collimator 4, the end of the stator end collimator 4 away from the first housing 3 is connected to the first optical fiber connector 6 through an optical fiber, and the outer portion of the optical fiber used to connect the stator end collimator 4 and the first optical fiber connector 6 is arranged with an armored outer sheath 5, and the output shaft of the hollow motor 1 is fixed with a rotor end collimator 2 that matches the stator end collimator 4. The first optical fiber connector 6 is connected to the light source, which is transmitted to the end face of the stator end collimator 4 through the optical fiber, and then continues to be transmitted through the modulated rotor end collimator 2, passing through the hollow motor 1, and finally the light emitted by the probe rod 8 is converged to the surface (sample arm) of the relevant parts or human biological tissues, etc. The surface or tissue will reflect back a part of the light signal along the original path, and the optical path difference of the system is changed by controlling the reference arm, thereby forming an interference signal, and then the axial depth signal can be reconstructed by performing a fast Fourier transform on the spectral signal, and finally the reconstruction of 2D and 3D images is realized.

[0032] In this embodiment, a second optical fiber connector 11 is fixedly connected to the coupling 71, and a third optical fiber connector 12 is fixedly connected to the end of the second optical fiber connector 11 away from the coupling 71. The optical signal transmitted through the inner cavity of the hollow motor 1 is finally emitted from one end of the probe rod 8 via the optical fiber coordinated with the second optical fiber connector 11 and the third optical fiber connector 12.

[0033] Reference Figure 5 and 6 As shown, in this embodiment, the inner cavity of the probe rod 8 is fixedly connected with a pigtail 81, and the inner cavity of the probe rod 8 and the pigtail 81 are coaxially arranged with a collimating lens 82 and a reflecting prism 84 in sequence. The probe rod 8 is provided with a light exit hole 85 matching the reflecting prism 84, and the optical signal emitted from one end of the pigtail 81 passes through the collimating lens 82 and the reflecting prism 84 in sequence, and is emitted from the probe rod 8 from the light exit hole 85. The collimating lens 82 converts the divergent light or parallel light into convergent light, and the light after collimation correction passes through the reflecting prism 84, and the light is reflected and passes through the light exit hole 85 on the probe rod 8, and converges at the corresponding working distance.

[0034] Reference Figure 6 As shown, in this embodiment, the outer sleeve of the pigtail 81 and the collimating lens 82 is fixedly connected with a mounting sleeve 83, and the mounting sleeve 83 is fixedly connected to the inner cavity of the probe rod 8. The probe rod 8 is provided with symmetrically arranged mounting holes 86, and the mounting holes 86 are screwed to fix the mounting sleeve 83. By integrating the pigtail 81 and the collimating lens 82 in the mounting sleeve 83, it is convenient to quickly install and disassemble the pigtail 81 and the collimating lens 82 in the inner cavity of the probe rod 8.

[0035] Reference Figure 2 and 3As shown, in this embodiment, one end of the hollow motor 1 is fixedly connected to a second housing 10, the second housing 10 is covered on the outside of the flexible connector 7 and does not contact the flexible connector 7, the radial constraint 9 is fixedly arranged in the inner cavity of the second housing 10, and the probe rod 8 passes through the second housing 10 away from one end of the hollow motor 1. During the rotation of the probe rod 8, the radial constraint 9 can limit the radial runout of the probe rod 8. Usually, the radial constraint 9 can be composed of a self-lubricating sleeve or a bearing, which can be selected according to the actual application. The self-lubricating sleeve can be processed to a smaller size, while the size of the bearing is subject to certain restrictions. The second housing 10 can protect the connection between the flexible connector 7 and the probe rod 8, and can also assist in the installation of the radial constraint 9 to ensure the stability of the probe rod 8 during rotation.

[0036] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions. The sentence "includes an element defined by ... does not exclude the existence of other identical elements in the process, method, article or device including the element".

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A confined space rotary scanning probe device with a replaceable probe rod, comprising a probe rod and a motor for driving the probe rod to rotate, characterized in that: The motor is a hollow motor, and the optical signal passes through the hollow motor through the optical fiber and goes out from one end of the probe rod to measure the space sample. The output shaft of the hollow motor drives the probe rod to rotate through a flexible connector. The probe rod is installed on the flexible connector in a pluggable and replaceable manner. The outside of the probe rod is provided with a radial constraint for limiting the radial runout of the probe rod during rotation.

2. The confined space rotation scanning probe device with replaceable probe rod according to claim 1, characterized in that: The flexible connector includes a coupling fixedly connected to the output shaft of the hollow motor and a locking sleeve. The coupling is connected to the locking sleeve via a flexible member. The probe rod is inserted into the inner hole of the locking sleeve and is locked and fixed.

3. The confined space rotation scanning probe device with replaceable probe rod according to claim 2, characterized in that: The locking sleeve is provided with a plurality of locking holes arranged in an annular manner, and the locking holes cooperate with screws to squeeze and fix the probe rod.

4. A confined space rotation scanning probe device with replaceable probe rod according to claim 2 or 3, characterized in that: One end of the hollow motor is fixedly connected to a first shell, and the inner cavity of the first shell is fixedly connected to a stator end collimator. The end of the stator end collimator away from the first shell is connected to a first optical fiber connector through an optical fiber. The outside of the optical fiber connecting the stator end collimator and the first optical fiber connector is arranged with an armored outer protection, and a rotor end collimator matching the stator end collimator is fixed on the output shaft of the hollow motor.

5. The confined space rotation scanning probe device with replaceable probe rod according to claim 4, characterized in that: A second optical fiber connector is fixedly connected to the coupling, and a third optical fiber connector is fixedly connected to the end of the second optical fiber connector away from the coupling. The optical signal transmitted through the inner cavity of the hollow motor is finally emitted from one end of the probe rod via the optical fiber cooperating with the second optical fiber connector and the third optical fiber connector.

6. A confined space rotation scanning probe device with replaceable probe rod according to any one of claims 1 to 3, characterized in that: A pigtail is fixedly connected to the inner cavity of the probe rod, and a collimating lens and a reflecting prism are arranged in sequence on the same axis as the pigtail in the inner cavity of the probe rod. A light exit hole matching the reflecting prism is opened on the probe rod, and an optical signal emitted from one end of the pigtail passes through the collimating lens and the reflecting prism in sequence, and is emitted from the probe rod through the light exit hole.

7. The confined space rotation scanning probe device with replaceable probe rod according to claim 6, characterized in that: The outer sleeves of the pigtail and the collimating lens are fixedly connected with a mounting sleeve, and the mounting sleeve is fixedly connected to the inner cavity of the probe rod. The probe rod is provided with symmetrically arranged mounting holes, and the mounting holes cooperate with screws to squeeze and fix the mounting sleeve.

8. The confined space rotation scanning probe device with replaceable probe rod according to claim 6, characterized in that: One end of the hollow motor is fixedly connected to a second shell, the second shell cover is arranged outside the flexible connector and does not contact the flexible connector, the radial constraint is fixedly arranged in the inner cavity of the second shell, and the probe rod passes through the second shell away from one end of the hollow motor.

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