A device for detecting inner wall coating of tubular parts

Abstract

The present invention discloses a device for detecting inner wall coating of tubular parts, comprising a terahertz probe, a part fixing device and a probe driving device, wherein the part fixing device is used to fix the tubular parts, and the probe driving device comprises a first mounting seat, a rotary drive motor, a rotary bracket, a linear drive motor and a probe seat, wherein the rotary drive motor is mounted on the first mounting seat, the rotary drive motor drives the rotary bracket to perform rotary motion, the linear drive motor is mounted on the rotary bracket, the linear drive motor drives the probe seat to perform linear motion, and the terahertz probe is mounted on the probe seat. The present invention can realize accurate control of the axial movement and rotary motion of the terahertz probe in the central through hole of the tubular part, and has the advantages of high detection accuracy, full detection position, fast detection speed, high detection efficiency, convenience for automatic control and continuous detection, improves the quality verification accuracy and efficiency of the tubular parts, and is beneficial to the quality assurance of the tubular parts.

Description

Technical Field

[0001] The invention relates to a detection device for a tubular part, in particular to a detection device for an inner wall coating of a tubular part. Background Art

[0002] Tubular parts are widely used in modern industry. For tubular parts used in specific environments, spraying coatings on the inner and outer surfaces of the parts for functions such as corrosion resistance and wear resistance is a common application method, and parameters such as coating thickness have an important influence on the quality of such parts.

[0003] As the name implies, coating thickness is a measure of the amount of paint applied to the surface of a part. Since the paint changes from a liquid to a solid when it cures or dries, the thickness varies greatly between the time the paint is applied and when the paint is completely dry. In addition, the coating thickness will also vary due to the different types of surfaces covered by the paint. Even with the same sprayer or brush, the coating thickness may show a large difference between the surface of the wear-resistant surface and the surface of the absorbent material. For the above reasons, the thickness detection of the coating on the parts is very important.

[0004] At present, coating thickness detection generally uses electromagnetic detection, such as using a terahertz spectrometer for detection. The basic principle is to place a terahertz probe close to the coating, and the terahertz electromagnetic wave generated by the terahertz probe will irradiate the coating and then reflect back. The terahertz probe transmits the received reflected signal to the terahertz spectrometer, and the terahertz spectrometer calculates the thickness of the coating based on the received data. The terahertz (THz) electromagnetic wave here refers to an electromagnetic wave with a frequency between infrared and microwave.

[0005] For the coating thickness of the outer surface, the traditional detection method is to use the above-mentioned terahertz spectrometer to detect manually. The manual method is not only inefficient, but also difficult to accurately and comprehensively detect the thickness of each part of the coating. More importantly, it is difficult to detect the inner wall coating of tubular parts by manual detection, which makes it very difficult to detect the inner wall coating of tubular parts. Or even if it can be detected barely, the detection is inaccurate and incomplete, which directly affects the quality verification of tubular parts, and is particularly not conducive to the quality assurance of tubular parts in the aviation and other fields. Summary of the invention

[0006] The purpose of the present invention is to provide a tubular part inner wall coating detection device which can accurately, comprehensively and efficiently detect the inner wall coating parameters of the tubular part in order to solve the above problems.

[0007] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0008] A device for detecting inner wall coating of a tubular part comprises a terahertz probe, a part fixing device and a probe driving device. The part fixing device is used to fix the tubular part. The probe driving device comprises a first mounting seat, a rotation driving motor, a rotating bracket, a linear driving motor and a probe seat. The rotation driving motor is mounted on the first mounting seat, the rotating shaft of the rotation driving motor is connected to the rotating bracket and drives the rotating bracket to perform rotational motion, the linear driving motor is mounted on the rotating bracket, the rotating shaft of the linear driving motor is connected to the probe seat and drives the probe seat to perform linear motion, the terahertz probe is mounted on the probe seat, and when the tubular part is mounted on the part fixing device, the probe seat can enter the central through hole of the tubular part.

[0009] Preferably, in order to achieve a more reliable driving effect for the rotational motion and linear motion of the terahertz probe, the probe driving device also includes a driving wheel, a synchronous belt, a guide rod, a second mounting seat, a rotating disk, a bearing, a driven wheel bracket and a driven wheel, the driving wheel is mounted on the rotating shaft of the linear drive motor, the rotating disk is mounted on the second mounting seat through the bearing, the two ends of the guide rod are respectively connected to the rotating bracket and the rotating disk, the driven wheel is mounted on the rotating disk through the driven wheel bracket, the two ends of the synchronous belt are respectively mounted on the driving wheel and the driven wheel, the probe seat is provided with a guide through hole and the guide rod passes through the guide through hole, the probe seat is connected to the synchronous belt and is located between the driving wheel and the driven wheel, and when the tubular part is mounted on the part fixing device, the guide rod and the synchronous belt both pass through the central through hole of the tubular part.

[0010] Preferably, in order to realize automatic control, the tubular part inner wall coating detection device also includes a controller and a terahertz spectrometer, the control input end of the rotary drive motor and the control input end of the linear drive motor are respectively connected to the control output end of the controller, and the signal output end of the terahertz probe is connected to the signal input end of the terahertz spectrometer.

[0011] Preferably, in order to achieve more precise and more comprehensive automated control, the tubular part inner wall coating detection device also includes a return to zero sensor, a first limit sensor and a second limit sensor, the return to zero sensor and the first limit sensor are respectively installed on the rotating bracket on one side close to the probe seat and can contact the probe seat when the probe seat moves to a corresponding position, the second limit sensor is installed on the second mounting seat through a sensor mounting rod, the second limit sensor is located between the second mounting seat and the probe seat and can contact the probe seat when the probe seat moves to a corresponding position, and the signal output end of the return to zero sensor, the signal output end of the first limit sensor and the signal output end of the second limit sensor are respectively connected to the signal input end of the controller.

[0012] Preferably, in order to realize the tensioning function of the synchronous belt to improve the transmission accuracy and avoid interference with the terahertz probe, the driven wheel is a tensioning wheel and is installed on the driven wheel bracket through a tensioning shaft. The driven wheel is located on the side of the rotating disk away from the first mounting seat. The rotating disk is provided with a through hole and the synchronous belt passes through the through hole.

[0013] Preferably, in order to achieve a more precise guiding function and to provide a more stable and reliable connection structure between the first mounting seat and the second mounting seat, the guide rods are two parallel to each other.

[0014] Preferably, in order to realize the fast and stable locking and fixing function of the tubular parts and minimize the damage to the outer wall coating of the tubular parts, the part fixing device includes a first fixing seat, a second fixing seat and a locking rod, the first fixing seat is provided with a first fixing plate, the first fixing plate is provided with a first fixing plate through hole, the second fixing seat is provided with a second fixing plate, the second fixing plate is provided with a second fixing plate through hole, the two ends of the plurality of locking rods are respectively connected to the first fixing plate and the second fixing plate, the space between the first fixing plate and the second fixing plate is used to install the tubular parts and the center through hole of the tubular parts after installation is mutually connected and coaxial with the first fixing plate through hole and the second fixing plate through hole, the first fixing seat and the second fixing seat are located between the first mounting seat and the second mounting seat and are arranged in sequence in the same straight line direction, and the guide rod and the synchronous belt both pass through the first fixing plate through hole and the second fixing plate through hole. According to actual application needs, the part fixing device may also adopt other structures, such as a mounting seat for locking and fixing the tubular part from the middle of the tubular part, but considering minimizing damage to the coating on the outer wall of the tubular part, fixing from both ends is a better choice; the second fixing plate of the above-mentioned first fixing plate can be arranged on an annular groove corresponding to the port of the tubular part, so as to achieve more precise positioning of the tubular part.

[0015] Preferably, in order to make the part fixing device have higher stability and a more stable and reliable fixing function for the tubular parts, there are four locking rods and they are evenly distributed on the outer circumference of the through hole of the first fixing plate and the through hole of the second fixing plate, and both ends of the locking rod are respectively provided with external threads, and the two ends of the locking rod respectively pass through the corresponding through holes on the first fixing plate and the corresponding through holes on the second fixing plate and are connected with the corresponding locking nuts.

[0016] Preferably, in order to more stably and reliably control the rotation speed of the terahertz probe, the rotating shaft of the rotating drive motor is connected to the rotating bracket through a reduction mechanism. The reduction mechanism here can be the simplest gear transmission structure, for example: the rotating shaft of the rotating drive motor is connected to the small diameter gear, the large diameter gear is installed on the rotating bracket, and the small diameter gear and the large diameter gear are meshed and connected with each other; in order to save space, the large diameter gear can be a circular ring gear arranged on the side surface of the rotating bracket, and the central axis of the small diameter gear is perpendicular to the plane where the large diameter gear is located, so that the reduction transmission function can be realized. At the same time, a connecting shaft is arranged in the middle of the rotating bracket, and the connecting shaft is connected to the corresponding through hole on the first mounting seat through a rolling bearing, so as to realize the positioning and installation of the rotating bracket and the rotating bracket can rotate freely.

[0017] Preferably, in order to control the movement of the terahertz probe more stably and reliably, the rotary drive motor and the linear drive motor are both servo motors.

[0018] The beneficial effects of the present invention are:

[0019] The present invention provides a part fixing device and a probe driving device, uses the part fixing device to lock and fix the tubular part, uses the probe driving device to install the terahertz probe and drive the terahertz probe to perform rotational motion and linear motion, thereby realizing accurate control of the axial movement and rotational motion of the terahertz probe in the central through hole of the tubular part, and realizing detection of relevant parameters of the inner wall coating of the tubular part such as coating thickness on the premise that the tubular part to be detected does not move. The invention has the advantages of high detection accuracy, full detection position, fast detection speed, high detection efficiency, convenience for automatic control and continuous detection, improves the quality verification accuracy and efficiency of the tubular part, and is particularly beneficial to the quality assurance of tubular parts in the fields of aviation and the like; the tubular part inner wall coating detection device adopts a split structure, is convenient for processing, transportation and assembly, and is suitable for popularization and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a stereoscopic view of the device for detecting the inner wall coating of a tubular part according to the present invention, and also shows the tubular part;

[0021] Figure 2is a three-dimensional view of a part fixing device of the device for detecting the inner wall coating of a tubular part according to the present invention, and also shows a tubular part;

[0022] Figure 3 is a three-dimensional diagram of a probe driving device of the tubular parts inner wall coating detection device of the present invention;

[0023] Figure 4 is an enlarged view of "A" in the stereogram of the probe driving device of the tubular parts inner wall coating detection device of the present invention;

[0024] Figure 5 It is an enlarged view of "B" in the stereoscopic view of the probe driving device of the tubular parts inner wall coating detection device of the present invention. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings:

[0026] like Figure 1-Figure 5 As shown, the tubular part inner wall coating detection device of the present invention includes a terahertz probe 39, a part fixing device 2 and a probe driving device 3, the part fixing device 2 is used to fix the tubular part 1, the probe driving device 3 includes a first mounting seat 31, a rotation drive motor 32, a rotation bracket 33, a linear drive motor 34 and a probe seat 38, the rotation drive motor 32 is installed on the first mounting seat 31, the rotating shaft of the rotation drive motor 32 is connected to the rotation bracket 33 (the specific connection structure is not visible in the figure, for example, it can be a structure connected by a reduction mechanism in the following preferred structure) and drives the rotation bracket 33 to rotate, and the linear drive motor 34 is connected to the rotation bracket 33. The linear drive motor 34 is installed on the rotating bracket 33, and the rotating shaft of the linear drive motor 34 is connected to the probe seat 38 (its connection structure is determined according to actual needs, such as adopting the synchronous belt transmission structure in the preferred structure described below) and drives the probe seat 38 to perform linear motion. The terahertz probe 39 is installed on the probe seat 38. When the tubular part 1 is installed on the part fixing device 2, the probe seat 38 can enter the central through hole of the tubular part 1, that is, the part fixing device 2 and the probe driving device 3 are required to be close to each other and meet the relative position relationship so that the probe seat 38 can perform linear motion and rotational motion in the central through hole of the tubular part 1.

[0027] like Figure 1-Figure 5 As shown, the present invention also discloses the following multiple more optimized specific structures. According to actual needs, the above structure can be superimposed and combined with one or more of the following structures to form a more optimized technical solution.

[0028] In order to achieve a more reliable driving effect for the rotational motion and linear motion of the terahertz probe 39, the probe driving device 3 also includes a driving wheel (not visible in the figure), a synchronous belt 37, a guide rod 40, a second mounting seat 45, a rotating disk 46, a bearing 44, a driven wheel bracket 48 and a driven wheel 47. The driving wheel is mounted on the rotating shaft of the linear drive motor 34, and the rotating disk 46 is mounted on the second mounting seat 45 through the bearing 44. The specific mounting structure is: a mounting through hole is provided on the second mounting seat 45, and the inner ring of the bearing 44 (preferably a rolling bearing) is sleeved outside the circumference of the rotating disk 46, and the bearing The outer ring of 44 is sleeved in the mounting through hole of the second mounting seat 45, the two ends of the guide rod 40 are respectively connected to the rotating bracket 33 and the rotating disk 46, the driven wheel 47 is installed on the rotating disk 46 through the driven wheel bracket 48, the two ends of the synchronous belt 37 are respectively installed on the driving wheel and the driven wheel 47, the probe seat 38 is provided with a guide through hole and the guide rod 40 passes through the guide through hole, the probe seat 38 is connected to the synchronous belt 37 and is located between the driving wheel and the driven wheel 47, and when the tubular part 1 is installed on the part fixing device 2, the guide rod 40 and the synchronous belt 37 both pass through the central through hole of the tubular part 1.

[0029] In order to realize automatic control, the tubular part inner wall coating detection device also includes a controller (not shown in the figure) and a terahertz spectrometer (not shown in the figure). The control input end of the rotary drive motor 32 and the control input end of the linear drive motor 34 are respectively connected to the control output end of the controller, and the signal output end of the terahertz probe 39 is connected to the signal input end of the terahertz spectrometer.

[0030] In order to achieve more precise and more comprehensive automated control, the tubular part inner wall coating detection device also includes a return to zero sensor 36, a first limit sensor 35 and a second limit sensor 41. The return to zero sensor 36 and the first limit sensor 35 are respectively installed on the rotating bracket 33 on one side close to the probe seat 38 and can contact the probe seat 38 when the probe seat 38 moves to the corresponding position. The second limit sensor 41 is installed on the second mounting seat 45 through the sensor mounting rod 42. The second limit sensor 41 is located between the second mounting seat 45 and the probe seat 38 and can contact the probe seat 38 when the probe seat 38 moves to the corresponding position. The signal output end of the return to zero sensor 36, the signal output end of the first limit sensor 35 and the signal output end of the second limit sensor 41 are respectively connected to the signal input end of the controller.

[0031] In order to realize the tensioning function of the synchronous belt 37 to improve the transmission accuracy and avoid interference with the terahertz probe 39, the driven wheel 47 is a tensioning wheel and is installed on the driven wheel bracket 48 through a tensioning shaft. The driven wheel 47 is located on the side of the rotating disk 46 away from the first mounting seat 31. The rotating disk 46 is provided with a through hole and the synchronous belt 37 passes through the through hole.

[0032] In order to achieve a more precise guiding function and to provide a more stable and reliable connection structure between the first mounting seat 31 and the second mounting seat 45 , the guide rods 40 are two parallel to each other.

[0033] In order to realize the fast and stable locking and fixing function of the tubular part 1 and minimize the damage to the outer wall coating of the tubular part 1, the part fixing device 2 includes a first fixing seat 22, a second fixing seat 24 and a locking rod 23. The first fixing seat 22 is provided with a first fixing plate 21, and the first fixing plate 21 is provided with a first fixing plate through hole (not visible in the figure). The second fixing seat 24 is provided with a second fixing plate 25, and the second fixing plate 25 is provided with a second fixing plate through hole 26. The two ends of multiple locking rods 23 are respectively connected to the first fixing plate 21 and the second fixing plate 25. The space between the first fixing plate 21 and the second fixing plate 25 is used to install the tubular part 1, and the central through hole of the tubular part 1 after installation is mutually connected and coaxial with the first fixing plate through hole and the second fixing plate through hole 26. The first fixing seat 22 and the second fixing seat 24 are located between the first mounting seat 31 and the second mounting seat 45 and are arranged in sequence in the same straight line direction. The guide rod 40 and the synchronous belt 37 both pass through the first fixing plate through hole and the second fixing plate through hole 26. The surfaces of the first fixing plate 21 and the second fixing plate 25 that are in contact with the tubular component 1 are both provided with a non-metallic material barrier layer to protect the coating on the surface of the tubular component 1 .

[0034] In order to make the part fixing device 2 have higher stability and a more stable and reliable fixing function for the tubular parts, there are four locking rods 23 and they are evenly distributed on the outer periphery of the first fixing plate through hole and the second fixing plate through hole 26. The two ends of the locking rod 23 are respectively provided with external threads. The two ends of the locking rod 23 respectively pass through the corresponding through holes on the first fixing plate 21 and the corresponding through holes on the second fixing plate 25 and are connected with the corresponding locking nuts 27.

[0035] In order to control the rotation speed of the terahertz probe 39 more stably and reliably, the rotating shaft of the rotation drive motor 32 is connected to the rotating bracket through a speed reduction mechanism (not visible in the figure).

[0036] In order to control the movement of the terahertz probe 39 more stably and reliably, the rotary drive motor 32 and the linear drive motor 34 are both servo motors.

[0037] Figure 3 and Figure 5 Also shown is a bearing cover 43 disposed outside the bearing 44 for protecting the bearing 44 and preventing dust.

[0038] like Figure 1-Figure 5As shown, when in use, the part fixing device 2 and the probe driving device 3 are placed on the same operating platform. First, the tubular part 1 to be tested (about 5 meters in length) is installed on the part fixing device 2, and then the guide rod 40 and the synchronous belt 37 are installed on the first mounting seat 31, and then the guide rod 40 and the synchronous belt 37 are passed through the tubular part 1. Be careful not to touch the inner wall of the tubular part 1 when passing through. The end of the synchronous belt 37 can be bound to the end of the guide rod 40, and the hardness of the guide rod 40 is used to complete frictionless passage through the center through hole of the tubular part 1, and then the binding is released, and then the guide rod 40 and the synchronous belt 37 are respectively installed on the second mounting seat 45, and finally the guide rod 40 and the tubular part 1 are adjusted and checked to be parallel to each other. It is best if the line between the center position of the rotating bracket 33 and the center position of the rotating disk 46 coincides with the center line of the tubular part 1.

[0039] After the installation is completed, the detection can be carried out. All equipment is started. The controller first controls the linear drive motor 34 to move the probe seat 38 and the terahertz probe 39 in the direction close to the first mounting seat 31 to achieve zero return. When the probe seat 38 contacts the zero return sensor 36, the linear drive motor 34 stops running and then rotates in the opposite direction to drive the probe seat 38 and the terahertz probe 39 to move in the direction close to the second mounting seat 45. After the terahertz probe 39 moves to the position where the detection needs to be started, the probe seat 38 and the terahertz probe 39 can be driven in two ways by the rotary drive motor 32 and the linear drive motor 34. One is to rotate one circle first, then move a certain distance in a straight line, and then rotate one circle again, and so on, until the detection of all preset positions is completed. The other is to rotate while moving in a straight line, that is, spiral movement, until the detection of all preset positions is completed. The terahertz probe 39 transmits the received reflection signal to the terahertz spectrometer, and the terahertz spectrometer calculates the thickness of the coating at the corresponding position based on the received data. According to actual needs, other driving modes can also be used for the probe holder 38 and the terahertz probe 39. In any case, automatic control can be achieved. When the probe holder 38 moves to the extreme positions at both ends, it will contact the first limit sensor 35 or the second limit sensor 41, and the controller will immediately control the rotation drive motor 32 and the linear drive motor 34 to stop running.

[0040] The above embodiments are only preferred embodiments of the present invention and are not limitations of the technical solutions of the present invention. Any technical solution that can be implemented on the basis of the above embodiments without creative work should be deemed to fall within the scope of protection of the patent of the present invention.

Claims

1. A device for detecting inner wall coating of a tubular part, comprising a terahertz probe, characterized in that: It also includes a part fixing device and a probe driving device, wherein the part fixing device is used to fix the tubular part, and the probe driving device includes a first mounting seat, a rotation drive motor, a rotating bracket, a linear drive motor and a probe seat, wherein the rotation drive motor is installed on the first mounting seat, the rotating shaft of the rotation drive motor is connected to the rotating bracket and drives the rotating bracket to perform rotational motion, the linear drive motor is installed on the rotating bracket, the rotating shaft of the linear drive motor is connected to the probe seat and drives the probe seat to perform linear motion, the terahertz probe is installed on the probe seat, and the tubular part is installed on the part fixing device When the probe seat is placed on the rotary table, the probe seat can enter the central through hole of the tubular part; the probe driving device also includes a driving wheel, a synchronous belt, a guide rod, a second mounting seat, a rotating disk, a bearing, a driven wheel bracket and a driven wheel, the driving wheel is mounted on the rotating shaft of the linear drive motor, the rotating disk is mounted on the second mounting seat through the bearing, the two ends of the guide rod are respectively connected to the rotating bracket and the rotating disk, the driven wheel is mounted on the rotating disk through the driven wheel bracket, the two ends of the synchronous belt are respectively mounted on the driving wheel and the driven wheel, the probe seat is provided with a guide through hole and the guide rod passes through the guide through hole , the probe seat is connected to the synchronous belt and is located between the driving wheel and the driven wheel, and when the tubular part is installed on the part fixing device, the guide rod and the synchronous belt both pass through the central through hole of the tubular part; the driven wheel is a tensioning wheel and is installed on the driven wheel bracket through a tensioning shaft, the driven wheel is located on the side of the rotating disk away from the first mounting seat, the rotating disk is provided with a through hole and the synchronous belt passes through the through hole; the part fixing device includes a first fixing seat, a second fixing seat and a locking rod, the first fixing seat is provided with a first fixing plate, the first fixing plate is provided with a first fixing plate through hole, and the second fixing A second fixing plate is provided on the fixed seat, a second fixing plate through hole is provided on the second fixing plate, two ends of the plurality of locking pull rods are respectively connected to the first fixing plate and the second fixing plate, the space between the first fixing plate and the second fixing plate is used to install the tubular part, and the central through hole of the tubular part after installation is mutually penetrated and coaxial with the first fixing plate through hole and the second fixing plate through hole, the first fixing seat and the second fixing seat are located between the first mounting seat and the second mounting seat and are arranged sequentially in the same straight line direction, and the guide rod and the synchronous belt both pass through the first fixing plate through hole and the second fixing plate through hole.

2. The device for detecting inner wall coating of tubular parts according to claim 1, characterized in that: The tubular part inner wall coating detection device also includes a controller and a terahertz spectrometer. The control input end of the rotary drive motor and the control input end of the linear drive motor are respectively connected to the control output end of the controller, and the signal output end of the terahertz probe is connected to the signal input end of the terahertz spectrometer.

3. The device for detecting inner wall coating of tubular parts according to claim 2, characterized in that: The tubular part inner wall coating detection device also includes a return to zero sensor, a first limit sensor and a second limit sensor. The return to zero sensor and the first limit sensor are respectively installed on one side of the rotating bracket close to the probe seat and can contact the probe seat when the probe seat moves to a corresponding position. The second limit sensor is installed on the second mounting seat through a sensor mounting rod. The second limit sensor is located between the second mounting seat and the probe seat and can contact the probe seat when the probe seat moves to a corresponding position. The signal output end of the return to zero sensor, the signal output end of the first limit sensor and the signal output end of the second limit sensor are respectively connected to the signal input end of the controller.

4. The device for detecting inner wall coating of a tubular part according to any one of claims 1 to 3, characterized in that: The guide rods are two parallel to each other.

5. The device for detecting inner wall coating of a tubular part according to any one of claims 1 to 3, characterized in that: There are four locking rods that are evenly distributed on the outer circumference of the through holes of the first fixing plate and the second fixing plate. Both ends of the locking rods are provided with external threads. The two ends of the locking rods pass through the corresponding through holes on the first fixing plate and the corresponding through holes on the second fixing plate respectively and are connected with the corresponding locking nuts.

6. The device for detecting inner wall coating of a tubular part according to any one of claims 1 to 3, characterized in that: The rotating shaft of the rotary drive motor is connected to the rotary bracket through a speed reduction mechanism.

7. The device for detecting inner wall coating of a tubular part according to any one of claims 1 to 3, characterized in that: The rotary drive motor and the linear drive motor are both servo motors.

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