Gear surface defect detection device and detection method thereof

Abstract

The invention discloses a gear surface defect detection device and a detection method thereof. The gear surface defect detection device comprises an industrial camera and a detection system electrically connected with the industrial camera, comprising rolling assemblies and a center supporting rod. The rolling assembly comprises a plurality of roller bases and a support, the roller bases are the same in structure and each comprise an L-shaped rotating shaft, a roller and a bottom plate, each L-shaped rotating shaft is sleeved with a plurality of rotatable rollers, a part of the rollers of each L-shaped rotating shaft roll on the tooth side face of the gear, and the other part of the rollers of each L-shaped rotating shaft roll on the matching face of the gear; and two sides of each L-shaped rotating shaft are respectively parallel to the tooth side surface and the matching surface of the gear. According to the invention, the maximum detection size limit is cancelled, the device is suitable for medium and large gears of more than half meters, the rolling assembly and the central support rod are simple in overall structure, and the device cost is low.

Description

Technical Field

[0001] The present invention belongs to the technical field of gear detection, and in particular, relates to a gear surface defect detection device and a detection method thereof. Background Art

[0002] In the production and transportation process, it is inevitable that defects such as gaps, scratches, and insufficient smoothness will form on the gear surface. For gear surface defects, the existing treatment methods include manual visual inspection, visual system inspection, ultrasonic inspection, magnetic particle inspection, and penetrant inspection. Among them, manual visual inspection can only be used as a preliminary detection method. The other detection methods are highly accurate, but the equipment costs of ultrasonic inspection, magnetic particle inspection, and penetrant inspection are relatively high. Visual system inspection has a low cost and is currently one of the main means of gear surface defect detection.

[0003] The working principle of the visual inspection system is: using industrial cameras to collect images of the gear surface, analyzing the images through image processing algorithms, and identifying defects on the gear surface, such as cracks, scratches, wear, notches, holes, etc. In order to facilitate the industrial camera to collect images, the existing visual inspection system is also equipped with a dedicated camera rotating table, camera cabinet, etc. The gear is placed on the rotating table or camera cabinet, the shooting angle of the industrial camera is fixed, and the gear rotates 360° at a constant angular velocity with the rotating table. The fill light cooperates with the industrial camera to complete the image acquisition of each gear tooth.

[0004] However, the above-mentioned visual inspection system still has some shortcomings: the camera rotating table and camera cabinet can indeed meet the shooting requirements of conventional-sized gears, but the diameter of the gears and gear rings of equipment such as engineering machinery, mining machinery, and ships can reach several meters. The existing camera rotating table or camera cabinet cannot meet the shooting requirements of such large gears and gear rings in terms of size and load-bearing capacity. Although the size of the camera rotating table or camera cabinet can be expanded accordingly to meet the shooting requirements of large gears, the cost is too high and it is difficult to implement. Therefore, there is a lack of a visual inspection system that can be used for large gears and a corresponding gear surface defect detection method. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a gear surface defect detection device, including an industrial camera and a detection system electrically connected to the industrial camera; including a rolling assembly and a central support rod; the rolling assembly includes a plurality of roller bases and a bracket, each roller base has the same structure and includes an L-shaped shaft, a roller and a bottom plate, each L-shaped shaft is sleeved with a plurality of rotatable rollers, a part of the rollers of each L-shaped shaft rolls on the tooth side surface of the gear, and another part of the rollers rolls on the matching surface of the gear, so that the two sides of each L-shaped shaft are respectively parallel to the tooth side surface and the matching surface of the gear; each bottom plate is fixed to one side of the corresponding L-shaped shaft and the bottom plate is located On the tooth side surface, the bottom plates of every two adjacent roller bases are hinged by a hinge axis perpendicular to the tooth side surface, and a telescopic member is provided between every two adjacent bottom plates. The angle between the two adjacent bottom plates is adjusted by the telescopic member, so that all the bottom plates are distributed along the circumference of the gear; the central support rod is fixed to the location of the central axis of the gear, the bracket is connected to the top of all the bottom plates, and one end of the bracket extends toward the side where the gear teeth are located, and the industrial camera is fixed to the end of the extended bracket, so that the shooting end of the industrial camera faces the gear teeth; the central support rod is connected to all the rolling bases through a traction rope, and all the rolling bases can be rotated around the central support rod through the traction rope.

[0006] The beneficial effects of the gear surface defect detection device of the present invention are: 1. The maximum detection size limit has been cancelled, making it suitable for medium and large gears over half a meter in length.

[0007] 2. Under the premise that the existing visual system inspection can ensure the inspection quality, compared with the existing ultrasonic inspection, magnetic particle inspection, penetration inspection and other equipment, the overall structure of the rolling assembly and the center support rod is simple and the equipment cost is low.

[0008] 3. The two sides of the L-shaped shaft realize horizontal positioning and vertical positioning respectively, and the gear image information is obtained along the circumferential direction. The shooting distance is constant, the focus is fixed, and the image is clear.

[0009] 4. The roller fits tightly with the gear, so there is no camera shake problem, the anti-shake effect is good, the image is clearer, and it is conducive to improving the inspection quality.

[0010] The preferred solution of the gear surface defect detection device in the present invention is as follows: each roller includes a hub and an elastically deformable rubber tire, the hub is rotatably connected to the corresponding L-shaped shaft, the rubber tire is fixedly connected to the hub via a plurality of elastically deformable spokes, and the contact area between the rubber tire and the gear is increased by deformation of the spokes and the rubber tire. Both the spokes and the rubber tire are made of elastic material, the spokes are curved, and the deformation of the rubber tire can greatly increase the contact area with the gear, thereby increasing the stability of the rolling assembly during movement. In order to achieve a stable deformation of the roller on the tooth side, a counterweight is provided on each base plate, and the weight of the counterweight is used to press the roller on the tooth side. In order to achieve a stable deformation of the roller on the mating surface, the tension is increased by tightening the traction rope, and the roller on the mating surface is pressed against the tooth side.

[0011] The preferred solution of the gear surface defect detection device in the present invention is: each base plate is provided with hinged ear plates at both ends, and the telescopic member includes a threaded tube and a matching threaded rod, one end of the threaded tube is hinged to the hinged ear plate of one base plate, and one end of the threaded rod is hinged to the hinged ear plate of another base plate through a rotatable shaft sleeve, and the threaded rod is rotated in the threaded tube to adjust the angle between the corresponding two base plates. All roller bases can adjust the angles with each other according to the diameter of the gear, so that all roller bases are distributed on the same arc line, and the arc line is concentric with the circle where the gear is located, ensuring that the rolling assembly is subjected to stable force during the circumferential rotation of the gear, and is suitable for medium and large gears of various gears, and is universal and strong.

[0012] The preferred solution of the gear surface defect detection device in the present invention is as follows: in order to fix each counterweight, each counterweight is provided with a longitudinal through hole, the bracket is provided with waist holes corresponding to all the longitudinal through holes one by one, and each base plate is provided with threaded holes directly opposite to the corresponding longitudinal through holes. Bolts are passed through the waist holes and the longitudinal through holes and tightened in the corresponding threaded holes, thereby clamping all the counterweights between the bracket and the base plate. The waist holes provide flexible adjustment space for adjusting the specific position of the bolts. The base plate, counterweight and bracket adopt a detachable connection structure. On the one hand, it meets the installation requirements of adjusting the base plate angle first and then fixing the counterweight and bracket. After fixing, the current angle of the base plate can be maintained, and the angle is stable and unchanged. On the other hand, the transportation space occupied after disassembly is small, which is convenient for equipment storage management and handling.

[0013] The preferred solution of the gear surface defect detection device in the present invention is: the central support rod is sleeved with a bearing, and the two ends of each traction rope are fixedly connected to the bearing and the corresponding L-shaped rotating shaft. There are two rolling assemblies, both of which are connected to the bearing of the central support rod through traction ropes, and the two rolling assemblies are symmetrically distributed relative to the central support rod; the brackets of the two rolling assemblies are respectively provided with industrial cameras, and the two industrial cameras are respectively electrically connected to the detection system. The traction ropes of the two sets of rolling assemblies will move synchronously with the circumferential movement of the rolling assemblies, and the bearings can prevent the traction ropes from being blocked and entangled with each other.

[0014] The present invention also provides a gear surface defect detection method, which is applied to the above-mentioned gear surface defect detection device, the gear is an internal gear or an external gear, and the steps are as follows: S1, the gear is placed flat on a flat ground or a test bench, and the central support rod is fixed to the ground or the test bench, and the central support rod coincides with the central axis of the gear; S2, all roller bases of the rolling assembly are fitted to the outer edge or inner edge of the gear, and the bottom plates of every two adjacent roller bases are hinged by a telescopic member; S3, the traction rope is tightened to deform all rollers on the mating surface to increase the contact area; S4, a counterweight of appropriate weight is placed on each bottom plate, so that all rollers on the tooth side surface are deformed. The roller is deformed to increase the contact area, and the threaded rod is rotated to adjust the angle between each two adjacent base plates so that all the base plates are located on the same arc line, and the center of the arc line is located on the central axis of the gear; S5. The bracket of the rolling assembly presses the corresponding counterweight between the bracket and the base plate through bolts, and adjusts the shooting end of the industrial camera at the extended end of the bracket to face the gear teeth on the inner side of the gear or the gear teeth on the outer side of the gear; S6. The rolling assembly is pulled to rotate around the central support rod through the circumferential driving force. Every time it rotates a certain angle, the industrial camera obtains the gear tooth image and sends it to the detection system, which processes the image and identifies and determines whether there are defects on the gear tooth surface.

[0015] The beneficial effects of the gear surface defect detection method of the present invention are: 1. Medium and large gears can be placed on the ground and can be inspected in various environments such as gear production workshops and assembly sites. It is not picky about the inspection location and is suitable for various scenarios, and there is no upper limit on the inspection size.

[0016] 2. There is no need to move or flip the gears during the detection process, so the operation is safe and risk-free.

[0017] 3. The camera method is the same as the existing visual system detection, which eliminates the process of familiarizing yourself with the equipment operation. The detection method is easy to use and has low difficulty.

[0018] The present invention also provides another gear surface defect detection method, which is applied to the above-mentioned gear surface defect detection device, the gear is an internal gear or an external gear, and the steps are as follows: S1, the gear is placed flat on a flat ground or a test bench, and the center support rod is fixed to the ground or the test bench, and the center support rod coincides with the center axis of the gear; S2, all roller bases of the two groups of rolling assemblies are fitted to the outer edge or inner edge of the gear, and the bottom plates of each adjacent two roller bases of each group of rolling assemblies are hinged by telescopic parts; S3, the traction rope is tightened to deform all rollers on the mating surface to increase the contact area, and the two groups of rolling assemblies are symmetrically distributed; S4, a counterweight of appropriate weight is placed on each bottom plate to deform all rollers on the tooth side to increase the contact area, and the threaded rod is rotated to adjust the distance between each adjacent two bottom plates Angle, so that all the base plates are located on the same arc line, and the center of the arc line is located on the central axis of the gear; S5, the bracket of each group of rolling components presses the corresponding counterweight between the bracket and the base plate through bolts, and adjusts the shooting ends of the industrial cameras at the extended ends of the two brackets to face the gear teeth on the inner side of the gear or the gear teeth on the outer side of the gear; S6, through the circumferential driving force, the two groups of rolling components are pulled in the same direction and rotate around the central support rod at the same time, and the two industrial cameras obtain the gear tooth image and send it to the detection system every time they rotate a certain angle; S7, the monitoring system compares the two sets of image data. If there is a difference between the two sets of image data and the difference is greater than 2%, S6 is repeated until the difference between the two sets of image data is less than 2%. Then the detection system processes the two sets of image data separately, and identifies and determines whether there are gear tooth surface defects in the two sets of image data.

[0019] The beneficial effect of the gear surface defect detection method in the present invention is that, compared with the above-mentioned gear surface defect detection method, it adds the error detection of shooting of industrial cameras, thereby improving the accuracy of the detection results. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a schematic structural diagram of a gear surface defect detection device having a rolling assembly in the present invention; Figure 2 for Figure 1 The three-dimensional Figure 1 ; Figure 3 for Figure 2 The enlarged view of point A in the middle; Figure 4 for Figure 1 The three-dimensional Figure 2 ; Figure 5 for Figure 4 The enlarged view of point B in the middle; Figure 6 It is a schematic structural diagram of a gear surface defect detection device having two rolling components in the present invention.

[0022] Reference numerals: Rolling assembly 1, central support rod 2, industrial camera 3, roller base 4, bracket 5, L-shaped shaft 6, roller 7, base plate 8, bolt 9, telescopic member 10, hinged ear plate 11, threaded tube 12, threaded rod 13, wheel hub 14, rubber tire 15, spoke 16, counterweight 17, waist hole 18, longitudinal through hole 19, traction rope 20, bearing 21, gear 22, bushing 23, hinged shaft 24. DETAILED DESCRIPTION

[0023] In view of the deficiencies in the prior art, the inventor of this case has proposed the technical solution of the present invention after long-term research and extensive practice. The following will further explain the technical solution, its implementation process and principle, etc. in conjunction with the drawings in the embodiments of this application and specific implementation cases.

[0024] It should be noted that the embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention. The described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, the present invention covers any substitution, modification, equivalent method and scheme made on the spirit, principle and scope of the present invention defined by the claims. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In the description of this application, unless otherwise clearly specified and limited, the technical or scientific terms used should have the usual meanings understood by persons with general skills in the field to which this application belongs. Terms such as "install", "connect", and "connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, a conflicting connection, or an integrated connection. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0026] Embodiment 1; like Figure 1As shown, the first embodiment provides a gear surface defect detection device, including a rolling assembly 1, a central support rod 2, an industrial camera 3 and a detection system electrically connected to the industrial camera 3, wherein the industrial camera 3 is wirelessly connected to the industrial camera 3 via a Bluetooth module. The specific structure of the rolling assembly 1 is as follows: like Figures 2 to 5 As shown, the rolling assembly 1 includes four roller bases 4 and a bracket 5. The structure of each roller base 4 is the same and includes an L-shaped shaft 6, a roller 7 and a bottom plate 8. Each L-shaped shaft 6 is sleeved with four rotatable rollers 7. The two rollers 7 of each L-shaped shaft 6 roll on the tooth side surface of the gear 22, and the other two rollers 7 roll on the matching surface of the gear 22, so that the two sides of each L-shaped shaft 6 are respectively parallel to the tooth side surface and the matching surface of the gear 22. Each L-shaped shaft 6 is not limited to four rollers 7, and can also be five or six rollers 7, which is not limited in this embodiment. The matching surface here is also called the installation surface, which refers to the back of the surface where the gear teeth of the gear 22 are located. The matching surface is often used to connect with other equipment. Each base plate 8 is fixed to one side of the corresponding L-shaped turn and the base plate 8 is located on the tooth side surface. The base plates 8 of each two adjacent roller bases 4 are hinged by a hinge shaft 24 perpendicular to the tooth side surface. A telescopic member 10 is provided between each two adjacent base plates 8. The telescopic member 10 is used to adjust the angle between the two adjacent base plates 8, so that all base plates 8 are distributed along the circumference of the gear 22. The specific hinge method between the two adjacent base plates 8 is that hinged ear plates 11 are respectively provided at both ends of each base plate 8. The telescopic member 10 includes a threaded tube 12 and an adapted threaded rod 13. One end of the threaded tube 12 is hinged to the hinged ear plate 11 of one base plate 8. One end of the threaded rod 13 is hinged to the hinged ear plate 11 of another base plate 8 through a rotatable shaft sleeve 23. The threaded rod 13 is rotated in the threaded tube 12, so as to adjust the angle between the corresponding two base plates 8. All roller bases 4 can adjust their angles accordingly according to the diameter of the gear 22, so that all roller bases 4 are distributed on the same arc line, and the arc line is concentric with the circle where the gear 22 is located, ensuring that the rolling component 1 is subjected to stable force during the circumferential rotation of the gear 22. It is suitable for medium and large gears 22 of various gears 22 and has strong universality.

[0027] In order to maintain the contact area between the lifting roller 7 and the surface of the gear 22, the structure of the roller 7 is optimized as follows in this embodiment: like Figure 5As shown, each roller 7 includes a hub 14 and an elastically deformable rubber tire 15, the hub 14 is rotatably connected to the corresponding L-shaped rotating shaft 6, and the rubber tire 15 is fixedly connected to the hub 14 through a plurality of elastically deformable spokes 16, and the contact area between the rubber tire 15 and the gear 22 is increased by the deformation of the spokes 16 and the rubber tire 15. The spokes 16 and the rubber tire 15 are both made of elastic materials, and the spokes 16 are curved. At the same time, after the rubber tire 15 is deformed, the contact area with the gear 22 can be greatly increased, and the stability of the rolling assembly 1 during movement can be increased. In order to achieve a stable deformation of the roller 7 on the tooth side, a counterweight 17 is provided on each bottom plate 8, and the weight of the counterweight 17 is used to press the roller 7 on the tooth side. In order to achieve a stable deformation of the roller 7 on the mating surface, the tension is increased by tightening the traction rope 20, and the roller 7 on the mating surface is pressed against the tooth side.

[0028] like Figure 1 and 3 As shown, the central support rod 2 in this embodiment is fixed to the location of the central axis of the gear 22, the bracket 5 is connected to the top of all the bottom plates 8, and one end of the bracket 5 extends toward the side where the gear teeth of the gear 22 are located, and the industrial camera 3 is fixed to the end of the extension of the bracket 5, so that the shooting end of the industrial camera 3 faces the gear teeth. Specifically, in order to fix each counterweight 17, each counterweight 17 is provided with a longitudinal through hole 19, the bracket 5 is provided with a waist hole 18 corresponding to all the longitudinal through holes 19, and each bottom plate 8 is provided with a threaded hole directly opposite to the corresponding longitudinal through hole 19, and the bolt 9 is passed through the waist hole 18 and the longitudinal through hole 19 and tightened in the corresponding threaded hole, so that all the counterweights 17 are clamped between the bracket 5 and the bottom plate 8. The bottom plate 8, the counterweight 17 and the bracket 5 adopt a detachable connection structure, which meets the installation requirements of adjusting the angle of the bottom plate 8 first and then fixing the counterweight 17 and the bracket 5. After fixing, the current angle of the bottom plate 8 can be maintained, and the angle is stable and does not change. On the other hand, the transportation space occupied after disassembly is small, which makes it convenient for equipment storage, management and handling.

[0029] like Figure 2 As shown, the central support rod 2 in this embodiment is connected to all rolling bases through a traction rope 20, and all rolling bases can be rotated around the central support rod 2 through the traction rope 20. The central support rod 2 is sleeved with a bearing 21, and the two ends of each traction rope 20 are fixedly connected to the bearing 21 and the corresponding L-shaped rotating shaft 6 respectively.

[0030] Embodiment 2: Embodiment 2 provides a gear surface defect detection method. The gear surface defect detection method of embodiment 2 is based on the gear surface defect detection device of embodiment 1, and comprises the following steps: First, place the gear 22 flat on a flat ground or test bench, and fix the center support rod 2 on the ground or test bench, and the center support rod 2 coincides with the center axis of the gear 22. Fit all roller bases 4 of the rolling assembly 1 to the outer edge or inner edge of the gear 22, and the bottom plates 8 of every two adjacent roller bases 4 are hinged by the telescopic member 10. Tighten the traction rope 20 to deform all rollers 7 on the mating surface to increase the contact area. A counterweight 17 of appropriate weight is placed on each bottom plate 8 to deform all rollers 7 on the tooth side to increase the contact area. Turn the threaded rod 13 to adjust the angle between every two adjacent bottom plates 8 so that all bottom plates 8 are located on the same arc line, and the center of the arc line is located at the center axis of the gear 22.

[0031] Then, the bracket 5 of the rolling component 1 presses the corresponding counterweight 17 between the bracket 5 and the base plate 8 through the bolt 9, and adjusts the shooting end of the industrial camera 3 at the extended end of the bracket 5 to face the gear teeth on the inner side of the gear 22 or the gear teeth on the outer side of the gear 22.

[0032] Finally, the driving force is provided externally, but the driving force needs to be along the circumference of the gear 22. The circumferential driving force pulls the rolling assembly 1 to rotate around the central support rod 2. Every time it rotates a certain angle, the industrial camera 3 obtains the gear tooth image and sends it to the detection system. The detection system processes the image and identifies whether there are defects on the gear tooth surface.

[0033] The gear surface defect detection method of this embodiment is safe and risk-free to operate. It is the same as the operation of the camera part of the existing visual system detection, but does not limit the maximum diameter of the gear 22. It is particularly suitable for medium and large gears 22, and there is no upper limit to the detection size of the gear 22.

[0034] Embodiment three: Embodiment 3 provides another gear surface defect detection device. The gear surface defect detection device of embodiment 2 has the same structure as that of embodiment 1, except that: Figure 6 As shown, there are two rolling assemblies 1, both of which are connected to the bearing 21 of the central support rod 2 through a traction rope 20, and the two rolling assemblies 1 are symmetrically distributed relative to the central support rod 2; the brackets 5 of the two rolling assemblies 1 are respectively provided with industrial cameras 3, and the two industrial cameras 3 are respectively electrically connected to the detection system. The traction ropes 20 of the two sets of rolling assemblies 1 are in a taut state and will move synchronously with the circumferential movement of the rolling assemblies 1, and the bearings 21 can prevent the traction ropes 20 from being blocked and entangled with each other.

[0035] Embodiment 4: Embodiment 4 provides another gear surface defect detection method, which is applied to the gear surface defect detection device of embodiment 3, and the steps are as follows: Place the gear 22 flat on a flat ground or test bench, fix the center support rod 2 on the ground or test bench, and the center support rod 2 coincides with the center axis of the gear 22. Fit all roller bases 4 of the two rolling assemblies 1 to the outer edge or inner edge of the gear 22, and the bottom plates 8 of each adjacent two roller bases 4 of each rolling assembly 1 are hinged by a telescopic member 10. Tighten the traction rope 20 to deform all rollers 7 on the mating surface to increase the contact area, and the two rolling assemblies 1 are symmetrically distributed; S4, place a counterweight 17 of appropriate weight on each bottom plate 8 to deform all rollers 7 on the tooth side to increase the contact area, and rotate the threaded rod 13 to adjust the angle between each adjacent two bottom plates 8, so that all bottom plates 8 are located on the same arc line, and the center of the arc line is located at the center axis of the gear 22. The bracket 5 of each rolling assembly 1 presses the corresponding counterweight 17 between the bracket 5 and the base plate 8 through the bolt 9, and adjusts the shooting ends of the industrial cameras 3 at the extension ends of the two brackets 5 to face the gear teeth on the inner side of the gear 22 or the gear teeth on the outer side of the gear 22. The two groups of rolling assemblies 1 are pulled in the same direction and rotated around the central support rod 2 at the same time by the circumferential driving force. Every time they rotate a certain angle, the two industrial cameras 3 acquire the gear tooth image and send it to the detection system. The monitoring system compares the two sets of image data. If there is a difference between the two sets of image data and the difference is greater than 2%, it is repeated until the difference between the two sets of image data is less than 2%. Then the detection system processes the two sets of image data separately and identifies and determines whether there are gear tooth surface defects in the two sets of image data.

[0036] The gear surface defect detection method provided in this embodiment can be used in gear production workshops, assembly sites and other environments to complete the detection. It is not picky about the detection location and is applicable to various scenarios. Compared with the gear surface defect detection method of the second embodiment, the shooting error check of the industrial camera 3 is added to improve the accuracy of the detection result.

[0037] It should be understood that the above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly. It cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, some simple deductions or substitutions can be made without departing from the concept of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A gear surface defect detection device, comprising an industrial camera and a detection system electrically connected to the industrial camera; Features: including a rolling assembly and a center support rod; The rolling assembly includes a plurality of roller bases and a bracket, each roller base has the same structure and includes an L-shaped shaft, a roller and a bottom plate, each L-shaped shaft is sleeved with a plurality of rotatable rollers, a part of the rollers of each L-shaped shaft rolls on the tooth side surface of the gear, and another part of the rollers rolls on the matching surface of the gear, so that the two sides of each L-shaped shaft are respectively parallel to the tooth side surface and the matching surface of the gear; each bottom plate is fixed to one side of the corresponding L-shaped shaft and the bottom plate is located on the tooth side surface, the bottom plates of each two adjacent roller bases are hinged by a hinge shaft perpendicular to the tooth side surface, and a telescopic member is provided between each two adjacent bottom plates, and the angle between the two adjacent bottom plates is adjusted by the telescopic member, so that all the bottom plates are distributed along the circumference of the gear; The central support rod is fixed to the location of the central axis of the gear, the bracket is connected to the top of all the bottom plates, and one end of the bracket extends toward the side where the gear teeth are located, and the industrial camera is fixed to the end of the extended bracket, so that the shooting end of the industrial camera faces the gear teeth; The central support rod is connected to all rolling bases through a traction rope, and all rolling bases can be rotated around the central support rod through the traction rope.

2. A gear surface defect detection device according to claim 1, characterized in that: Each roller includes a wheel hub and an elastically deformable rubber tire. The wheel hub is rotatably connected to the corresponding L-shaped shaft. The rubber tire and the wheel hub are fixedly connected via a plurality of elastically deformable spokes. The contact area between the rubber tire and the gear is increased by deformation of the spokes and the rubber tire.

3. A gear surface defect detection device according to claim 1, characterized in that: Each base plate is provided with hinged ear plates at both ends, and a counterweight is provided on the top of each base plate; each counterweight is provided with a longitudinal through hole, the bracket is provided with waist holes corresponding to all the longitudinal through holes one by one, and each base plate is provided with threaded holes facing the corresponding longitudinal through holes, and bolts are passed through the waist holes and the longitudinal through holes and tightened in the corresponding threaded holes, thereby clamping all the counterweights between the bracket and the base plate.

4. A gear surface defect detection device according to claim 3, characterized in that: The central support rod is sleeved with a bearing, and the two ends of each traction rope are respectively fixedly connected to the bearing and the corresponding L-shaped rotating shaft.

5. A gear surface defect detection device according to claim 4, characterized in that: The telescopic member includes a threaded tube and a matching threaded rod, one end of the threaded tube is hinged to the hinged ear plate of one base plate, and one end of the threaded rod is hinged to the hinged ear plate of another base plate through a rotatable sleeve. The threaded rod is rotated in the threaded tube to adjust the angle between the corresponding two base plates.

6. A gear surface defect detection device according to claim 5, characterized in that: There are two rolling assemblies, both of which are connected to the bearings of the central support rod through a traction rope, and the two rolling assemblies are symmetrically distributed relative to the central support rod; the brackets of the two rolling assemblies are respectively provided with industrial cameras, and the two industrial cameras are respectively electrically connected to the detection system.

7. A gear surface defect detection method, characterized in that: Based on the gear surface defect detection device described in claim 5, the gear is an internal gear or an external gear, and the steps are as follows: S1. Place the gear flat on the ground or on a testing table, fix the center support rod on the ground or on the testing table, and ensure that the center axis of the center support rod coincides with the center axis of the gear; S2. Fit all roller bases of the rolling assembly to the outer edge or inner edge of the gear, and the bottom plates of every two adjacent roller bases are hinged by telescopic parts; S3, tighten the traction rope to deform all rollers on the mating surface to increase the contact area; S4. A counterweight of appropriate weight is placed on each base plate to deform all rollers on the tooth side to increase the contact area. The threaded rod is rotated to adjust the angle between each two adjacent base plates so that all base plates are located on the same arc line, and the center of the arc line is located on the central axis of the gear. S5. The bracket of the rolling assembly presses the corresponding counterweight between the bracket and the bottom plate through bolts, and adjusts the shooting end of the industrial camera at the extended end of the bracket to face the gear teeth on the inner side of the gear or the gear teeth on the outer side of the gear; S6. The rolling assembly is pulled to rotate around the central support rod by a circumferential driving force. Every time it rotates a certain angle, the industrial camera acquires the gear tooth image and sends it to the detection system. The detection system processes the image and identifies whether there are defects on the gear tooth surface.

8. A method for detecting gear surface defects, characterized in that: Based on the gear surface defect detection device according to claim 6, the gear is an internal gear or an external gear, and the steps are as follows: S1. Place the gear flat on the ground or on a testing table, fix the center support rod on the ground or on the testing table, and ensure that the center axis of the center support rod coincides with the center axis of the gear; S2, all the roller bases of the two rolling assemblies are fitted to the outer edge or the inner edge of the gear, and the bottom plates of every two adjacent roller bases of each rolling assembly are hinged by a telescopic member; S3, tighten the traction rope to deform all rollers on the mating surface to increase the contact area, and the two sets of rolling components are symmetrically distributed; S4. A counterweight of appropriate weight is placed on each base plate to deform all rollers on the tooth side to increase the contact area. The threaded rod is rotated to adjust the angle between each two adjacent base plates so that all base plates are located on the same arc line, and the center of the arc line is located on the central axis of the gear. S5. The bracket of each set of rolling assemblies presses the corresponding counterweight between the bracket and the bottom plate through bolts, and adjusts the shooting ends of the industrial cameras at the two extended ends of the brackets to face the gear teeth on the inner side of the gear or the gear teeth on the outer side of the gear; S6, using circumferential driving force to pull the two sets of rolling assemblies in the same direction and rotate around the central support rod at the same time, and each time the rolling assemblies rotate by a certain angle, two industrial cameras acquire gear teeth images and send them to the detection system; S7, the monitoring system compares the two sets of image data. If there is a difference between the two sets of image data and the difference is greater than 2%, S6 is repeated until the difference between the two sets of image data is less than 2%. The detection system then processes the two sets of image data separately and identifies and determines whether there are gear tooth surface defects in the two sets of image data.

Images