Hole pattern detection device of precision rolling mill

Abstract

The invention belongs to the field of gear machining devices, and particularly relates to a hole pattern detection device of a precision rolling mill, which comprises a cabinet, a positioning clamp fixedly connected to the middle position of the cabinet, a rolling mill arranged on the positioning clamp, and a laser generator arranged at one end of the rolling mill and capable of doing circular motion. A laser receiving part is arranged at the end, away from the laser generator, of the rolling mill, laser emitted by the laser generator keeps horizontal all the time, and the rotation radius of the laser generator during circular motion is variable during rotation. The detection data are continuous level fluctuation signals, the continuous signal detection is realized, the actual data of the rolling mill hole pattern can be reflected more truly and accurately, the detection precision and the detection authenticity are further improved, the technical breakthrough is easy to realize, the development prospect is better, and the cost is lower.

Description

Technical Field

[0001] The present invention belongs to the technical field of roll pass detection of rolling mills, and specifically relates to a roll pass detection device for a precision rolling mill. Background Art

[0002] Rolling is a metal plastic forming process. By applying pressure to a metal blank with rotating rolls, plastic deformation occurs to obtain metal products with the required shape and size. It has the advantages of high production continuity, high processing precision, and high surface quality of the processed products. It is a metal processing process with broad application prospects. Especially in the field of new materials, since rolling can produce aerospace aluminum alloy materials with thin walls, light weight, and high strength, it has attracted wide attention in the processing technology field of aerospace new materials.

[0003] Rolling mills can be divided into plate rolling mills and bar and wire rolling mills according to the material forms they process. Among them, the three-roll Y-type rolling mill used for rolling metal pipes and bar and wire products is composed of three rolls that are 120° apart from each other and are arranged in a positive Y-type or reverse Y-type respectively. The three-roll bar and wire rolling mill can perform efficient and high-precision rolling processing on bar or wire products. Since the sizes of the roll passes of each rolling mill required for different specifications of bars are different, and the required roll ring specifications are also different at the same time, it is necessary to frequently replace the rolling mill. After replacing the roll rings and the three-roll guard, it is necessary to further determine the sizes of the holes of the roll rings and guide wheels. At this time, it is necessary to detect the roll pass to determine its size. Moreover, the three-roll rolling mill belongs to precision processing equipment, and its size verification must be carried out after being used for a period of time to ensure its processing precision.

[0004] Especially the processing roll pass of the three-roll rolling mill is a direct influencing factor for the surface processing size and precision of the bar. It is particularly important to detect the processing roll pass. The methods for roll pass detection in the prior art include optical detection, that is, using a light source to irradiate the hole formed by the rolls and the guard of the three-roll rolling mill, and using an imaging device to capture the projection of the hole, and comparing the contour and shape of the projection to achieve the detection of the roll pass of the three-roll rolling mill.

[0005] For example, Chinese Patent No. CN213274117U discloses a roll pass detection device for a three-roll star-type precision rolling mill, including a detection support component and a fixed support component. A light source component and a camera component are coaxially and oppositely arranged on the detection support component, and the light source component and the camera component are respectively located on both sides of the fixed support component; an installation position and a limiting component for fixing the rolling mill are arranged on the fixed support component, and a protection component for protecting the light source component and the camera component is also arranged. By improving the fixed support component, the installation of the rolling mill is made more stable and reliable. The light source component and the camera component are coaxially set, and maintaining the high coaxiality of the camera component and the light source component can meet the high precision and reliability of optical detection.

[0006] However, in actual use, the following problems exist in this detection method and detection device:

[0007] 1. To ensure the imaging quality, it is usually necessary to use a high-power light source to increase the light input of the camera. Moreover, to ensure the imaging quality, it is also necessary to use a high-resolution photosensitive imaging element, and a telecentric lens is needed to eliminate the influence of perspective on detection. All these require extremely high costs to meet relatively high imaging quality and better detection accuracy, resulting in difficult control of the production cost of the detection device, and the subsequent maintenance and replacement costs are also expensive, making it unacceptable and discouraging for users.

[0008] 2. The above-mentioned hole pattern detection device uses a photosensitive imaging element to convert the actual image into a digital image formed by a pixel array when detecting the hole pattern, and then the system performs comparison and analysis. However, the pixel image is equivalent to discrete values during system comparison, while the real information of the hole pattern is continuous linear data. When performing high-precision detection of the hole pattern, it is ultimately difficult to truly reflect the real information of the hole pattern.

[0009] 3. In order to improve the accuracy of hole pattern detection, it is necessary to use a photosensitive imaging element with a higher resolution and increase the pixel density to make up for the error when discrete values are compared with linear data. However, in the existing technology, it is extremely difficult and costly to increase the pixel density of the photosensitive imaging element, and its development has reached a bottleneck, making it difficult to achieve a rapid technological breakthrough, and thus difficult to achieve a qualitative breakthrough in detection accuracy. Summary of the Invention

[0010] In order to overcome the deficiencies of the prior art, the technical problem solved by the present invention is to precisely detect the hole pattern by using a single laser beam to irradiate in parallel and perform circular motion to scan the annular area of the edge of the hole pattern of the rolling mill, and cooperate with a lens to refract the laser beam so that a photosensitive sensor detects the optical signal. Compared with the traditional method of using expensive photosensitive imaging elements and telecentric lenses, the production and maintenance costs of the detection device are greatly reduced. By using the detection method of laser scanning in cooperation with the photosensitive sensor, the detection data is a continuous level fluctuation signal, realizing continuous signal detection, which can more truly and accurately reflect the actual data of the hole pattern of the rolling mill, thereby improving the detection accuracy and authenticity of the detection. By using the detection method of laser scanning in cooperation with the photosensitive sensor, the factors affecting the detection accuracy mainly lie in the diameter of the laser beam and the driving control accuracy when the laser rotates and moves horizontally, and these influencing factors are easy to control and easy to achieve technological breakthroughs, having good development prospects.

[0011] In order to achieve the above object, the present invention provides the following technical solution: A hole pattern detection device for a precision rolling mill, the hole pattern detection device for the precision rolling mill includes:

[0012] Cabinet, a positioning fixture is fixedly connected to the middle position of the cabinet, and a rolling mill is arranged on the positioning fixture;

[0013] Laser generator, a laser generator capable of making a circular motion is arranged at one end of the rolling mill, and a laser receiving component is arranged at the end of the rolling mill far from the laser generator;

[0014] Among them, the laser emitted by the laser generator always remains horizontal, and the rotation radius of the laser generator during circular motion is variable during rotation.

[0015] Furthermore, a base is fixedly connected to the cabinet at the position corresponding to the laser generator. A bearing cover is fixedly connected to the top of the base. A turntable is rotatably connected between the base and the bearing cover. Large-diameter bearings are arranged between the two ends of the turntable and the base and the bearing cover. A chute is opened at the center of the turntable, and the laser generator can slide in the chute.

[0016] Furthermore, an inner housing is fixedly sleeved outside the laser generator. An outer housing is rotatably connected to the outside of the inner housing. An arc-shaped groove is opened on the outer housing, and a fastening bolt passing through the inner housing is arranged in the arc-shaped groove. The inner housing is slidably arranged in the chute.

[0017] Furthermore, lead screws are respectively rotatably connected to both sides of the chute inside the turntable. A lead screw seat is threadedly connected to the same side of each lead screw. The two lead screw seats are fixedly connected to the inner housing. Two symmetric first motors are respectively arranged at the positions corresponding to each lead screw inside the turntable. The power output end of each first motor is in transmission connection with the corresponding lead screw.

[0018] Furthermore, a counterweight is threadedly connected to the part of each lead screw far from the lead screw seat. The thread pitches at both ends of each lead screw are the same and the thread directions are opposite. A bracket is fixedly connected to the side of the turntable far from the rolling mill. A slip ring coaxial with the turntable is fixedly connected to the outside of the bracket. The slip ring is electrically connected to the two first motors and the laser generator respectively.

[0019] Furthermore, a toothed ring is fixedly connected to one side of the turntable. A gear is rotatably connected to the bottom of the base below the toothed ring. The gear is in meshing transmission connection with the toothed ring. A gear cover covering the gear is fixedly connected to the bottom of the base. A second motor is fixedly connected to the side of the base far from the gear. The power output end of the second motor passes through the base and is in transmission connection with the gear.

[0020] Furthermore, the laser receiving component includes a support. The support is fixedly connected to the cabinet. A photosensitive sensor is fixedly connected to the side of the top of the support close to the rolling mill. A convex lens is arranged on the side of the photosensitive sensor facing the rolling mill. The converging focus of the convex lens is located at the photosensitive sensor.

[0021] Further, the edge of the convex lens is fixedly connected to a lens seat. A cylinder shell covering the convex lens and the photosensitive sensor is arranged outside the lens seat. The cylinder shell is fixedly connected to the support seat, and a light-transmitting plate is fixedly connected to one end of the cylinder shell away from the support seat.

[0022] Further, two sliding rails are symmetrically and fixedly connected to the cabinet on both sides of the rolling mill. Two symmetrically arranged light-shielding covers are slidably connected to the two sliding rails. A handle is fixedly connected to the outside of each light-shielding cover, and a buckle is fixedly connected to the edges of the two ends of the two light-shielding covers close to each other.

[0023] Further, an exhaust elbow is fixedly connected to the side of the light-shielding cover close to the laser generator away from the rolling mill. The exhaust elbow is communicated with the inside of the light-shielding cover and bends downward. A blower is fixedly connected to the cabinet. The air outlet of the blower is fixedly communicated with a filter. One end of the air injection hose away from the light-shielding cover far from the laser generator is fixedly communicated. The end of the air injection hose away from the light-shielding cover passes through the cabinet and is communicated with the filter.

[0024] In summary, compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] (1) By using a single laser beam to irradiate parallelly and make a circular motion, scanning the annular area of the edge of the rolling mill pass, and cooperating with the refraction of the laser beam by the lens to enable the photosensitive sensor to detect the optical signal, the accurate detection of the pass is realized. And compared with the traditional method using expensive photosensitive imaging elements and telecentric lenses, the production and maintenance costs of the detection device are greatly reduced.

[0026] (2) By using the detection method of laser scanning in cooperation with the photosensitive sensor, the detection data is a continuous level fluctuation signal, realizing continuous signal detection, and can more truly and accurately reflect the actual data of the rolling mill pass, thereby improving the detection accuracy and the authenticity of the detection.

[0027] (3) By using the detection method of laser scanning in cooperation with the photosensitive sensor, the factors affecting the detection accuracy mainly lie in the diameter of the laser beam and the driving control accuracy of the laser during rotation and horizontal movement. And these influencing factors are easy to control, and at the same time, it is easy to achieve technological breakthroughs, having good development prospects. Description of the Drawings

[0028] Figure 1 It is a three-dimensional schematic diagram of this patent.

[0029] Figure 2 It is a top view of this patent.

[0030] Figure 3 is Figure 2Stereoscopic sectional view at A-A in [the figure].

[0031] Figure 4 is Figure 3 Partial enlarged view at C in [the figure].

[0032] Figure 5 is Figure 2 Stereoscopic sectional view at B-B in [the figure].

[0033] Figure 6 Schematic structural diagram of the turntable.

[0034] Figure 7 Schematic structural diagram of the laser generator.

[0035] Figure 8 Schematic structural diagram of the laser receiving component.

[0036] Figure 9 Schematic position diagram of the detection area.

[0037] Explanation of reference numerals: Cabinet 10; Positioning fixture 11; Rolling mill 12; Base 13; Bearing cover 14; Turntable 15; Chute 16; Outer housing 17; Inner housing 18; Laser generator 19; Arc groove 20; Fastening bolt 21; Lead screw 22; First motor 23; Lead screw seat 24; Counterweight 25; Bracket 26; Slip ring 27; Ring gear 28; Gear 29; Gear cover 30; Second motor 31; Large-diameter bearing 32; Support 33; Cylindrical shell 34; Transparent plate 35; Lens seat 36; Convex lens 37; Photosensitive sensor 38; Slide rail 39; Light-shielding cover 40; Sealing strip 41; Handle 42; Lock 43; Exhaust elbow 44; Fan 45; Filter 46; Air injection hose 47; Detection area 48. Detailed implementation manners

[0038] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0039] As Figures 1-9As shown, a hole type detection device for a precision rolling mill includes a cabinet 10, a positioning fixture 11 is fixedly connected to the cabinet 10, a rolling mill 12 is clamped on the positioning fixture 11, a base 13 is fixedly connected to the cabinet 10 at one end of the rolling mill 12, a bearing cover 14 is fixedly connected to the top of the base 13, a turntable 15 composed of two parts is rotatably connected between the base 13 and the bearing cover 14, a slide groove 16 is provided in the turntable 15, an outer cover shell 17 is slidably connected in the slide groove 16, an inner shell 18 is rotatably connected in the outer cover shell 17, a laser generator 19 capable of emitting a horizontal laser beam is fixedly connected in the inner shell 18, a laser receiving component is provided at one end of the cabinet 10 located at the rolling mill 12 away from the laser generator 19, the vicinity of the contour of the central hole of the rolling mill 12 is a detection area 48, and the laser emitted by the laser generator 19 can scan the detection area 48 on the rolling mill 12.

[0040] By providing a rotatable laser generator 19 that can slide linearly in the slide groove 16, the laser can scan the detection area 48 on the rolling mill 12, and the laser receiving component can be used to detect which positions are blocked and which positions the laser passes smoothly during the scanning process, thereby achieving accurate detection of the hole type. Compared with the traditional method of using expensive photosensitive imaging elements and telecentric lenses, the production and maintenance costs of the detection device are greatly reduced.

[0041] In addition, by utilizing the detection method of laser patrol in conjunction with the laser receiving component, the detection data can be made into a continuous level fluctuation signal, thereby realizing continuous signal detection, which can more truly and accurately reflect the actual data of the rolling mill hole type, thereby improving the detection accuracy and authenticity.

[0042] like Figures 1-9 As shown, two symmetrical lead screws 22 are rotatably connected at both sides of the slide groove 16 in the turntable 15, and the pitches of both ends of each lead screw 22 are the same and the thread directions are opposite. The same side of the two lead screws 22 is threadedly connected with a lead screw seat 24, and each lead screw seat 24 is fixedly connected to the outer cover shell 17. One end of each lead screw 22 away from the lead screw seat 24 is threadedly connected with a counterweight 25, and the counterweight 25 is modularly arranged. One end of the turntable 15 close to the rolling mill 12 is fixedly connected with a gear ring 28, and the bottom of the base 13 is located below the gear ring 28 and is rotatably connected with a gear 29, which is meshed and driven with the gear ring 28, and the bottom of the base 13 is fixedly connected with a gear cover 30 covering the gear 29.

[0043] By setting the lead screw 22 and the lead screw seat 24, the outer cover shell 17 and the laser generator 19 can be controlled to slide and adjust their positions in the slide groove 16, and the gear 29 engages the transmission rod gear ring 28 to drive the turntable 15 to rotate as a whole, thereby realizing the laser generator 19 to make circular motion with a variable rotation radius, thereby performing a comprehensive and continuous scan of the detection area 48 to detect the hole type. In this way, the factors affecting the detection accuracy are mainly the diameter of the laser beam and the driving control accuracy of the laser during rotation and horizontal movement. These influencing factors are easy to control and easy to achieve technological breakthroughs, and have good development prospects.

[0044] By providing the counterweight 25, the counterweight 25 can slide in the opposite direction to the outer cover shell 17 and the laser generator 19 during the sliding movement in the slide groove 16, thereby adjusting and balancing the center of gravity, and effectively reducing the problem of vibration caused by the overall center of gravity shift of the turntable 15 due to the change in position of the laser generator 19 in the slide groove 16, which affects the stability of the laser emitted by the laser generator 19 and thus affects the detection accuracy.

[0045] like Figures 1-9 As shown, a first motor 23 is fixedly connected to the turntable 15 at a position corresponding to each lead screw 22, and the two first motors 23 are symmetrically arranged with each other. The power output end of each first motor 23 is transmission-connected to the corresponding lead screw 22, a second motor 31 is fixedly connected to the bottom of the base 13, and the power output end of the second motor 31 is transmission-connected to the gear 29, large-diameter bearings 32 are arranged at both ends of the turntable 15, and a bracket 26 is fixedly connected to the end of the turntable 15 away from the rolling mill 12, and a collector ring 27 is fixedly connected to the outer side of the bracket 26, and the collector ring 27 is electrically connected to the two first motors 23 and the laser generator 19 respectively.

[0046] By setting the first motor 23, the driving screw 22 can be driven to rotate, and by setting the second motor 31, the driving gear 29 can be driven to rotate, thereby respectively realizing the rotation and linear sliding action of the laser generator 19. By setting the large-diameter bearing 32, the friction when the turntable 15 rotates can be reduced, and the weight of the turntable 15 itself can be used as a flywheel, thereby effectively improving the stability and smoothness of the laser generator 19 when performing circular motion. In addition, by setting the collector ring 27, the laser generator 19 and the first motor 23 can be stably powered and controlled when rotating with the turntable 15, thereby ensuring stable operation of the device.

[0047] like Figures 1-9 As shown, an arc-shaped groove 20 is formed on the outer cover shell 17 , and a fastening bolt 21 passing through the inner shell 18 is arranged in the arc-shaped groove 20 .

[0048] By setting the arc groove 20 and the fastening bolt 21, the angles of the inner casing 18 and the laser generator 19 can be adjusted, so as to ensure that the laser generator 19 can always emit horizontal light, and thus ensure the accuracy of hole type detection.

[0049] As Figures 1-9 shown, the laser receiving component includes a support 33, the support 33 is fixedly connected to the cabinet 10, a photosensitive sensor 38 is fixedly connected to one side of the top of the support 33 close to the rolling mill 12, a convex lens 37 is arranged on the side of the photosensitive sensor 38 facing the rolling mill 12, the converging focus of the convex lens 37 is located at the photosensitive sensor 38, a lens seat 36 is fixedly connected to the edge of the convex lens 37, a cylinder shell 34 covering the convex lens 37 and the photosensitive sensor 38 is arranged outside the lens seat 36, the cylinder shell 34 is fixedly connected to the support 33, and a light-transmitting plate 35 is fixedly connected to one end of the cylinder shell 34 away from the support 33.

[0050] By setting the convex lens 37, the laser emitted by the laser generator 19 is refracted to the photosensitive sensor 38, and the photosensitive sensor 38 is used to judge whether the laser is received, so as to realize the detection of the hole type. Since the focus of the convex lens 37 coincides with the position of the photosensitive sensor 38, no matter where the laser emitted by the laser generator 19 is located, the photosensitive sensor 38 can always coincide with the optical path of the laser. By setting the cylinder shell 34 and the light-transmitting plate 35, the relatively fragile convex lens 37 and the photosensitive sensor 38 can be effectively protected.

[0051] The lens is used to refract the laser beam so that the photosensitive sensor can always receive continuous optical signals. As long as it is ensured that the lens finally focuses on the photosensitive element of the photosensitive sensor, the photosensitive area of the photosensitive sensor 38 has a certain area to allow for errors in the refraction angle, so that the processing accuracy requirements for the lens are not high, thereby reducing the production cost and the debugging difficulty.

[0052] As Figures 1-9 shown, two slide rails 39 are symmetrically and fixedly connected to both sides of the rolling mill 12 on the cabinet 10. Two symmetrically arranged light-shielding covers 40 are slidably connected to the two slide rails 39. A handle 42 is fixedly connected to the outside of each light-shielding cover 40. Lock catches 43 are fixedly connected to the edges of the two ends of the two light-shielding covers 40 close to each other. An exhaust elbow 44 is fixedly connected to the side of the light-shielding cover 40 close to the laser generator 19 and away from the rolling mill 12. The exhaust elbow 44 is communicated with the inside of the light-shielding cover 40 and bends downward. A blower 45 is fixedly connected to the cabinet 10. An air filter 46 is fixedly connected to the air outlet of the blower 45. An air injection hose 47 is fixedly connected to one end of the light-shielding cover 40 away from the laser generator 19 and away from the rolling mill 12. One end of the air injection hose 47 away from the light-shielding cover 40 passes through the cabinet 10 and is communicated with the air filter 46.

[0053] By setting two light-shielding covers 40 that can slide, during the hole pattern detection process, the two light-shielding covers 40 are closed and locked with a latch 43, thereby completely covering the entire detection space and preventing external stray light from entering the detection space and interfering with the accuracy of the detection.

[0054] Meanwhile, an air blower 45 is used to continuously inject air into the light-shielding cover 40 through an air injection hose 47, and the air is filtered by a filter 46 before being injected into the light-shielding cover 40, so that clean air continuously enters the light-shielding cover 40 to prevent floating dust and the like in the light-shielding cover 40 from affecting the detection effect. The continuously injected clean air forms a positive pressure inside the light-shielding cover 40, and the clean air continuously blows out from the exhaust elbow 44 and other gaps, preventing external dust and the like from entering and further improving the cleanliness effect inside the detection space.

[0055] The downward bending setting of the exhaust elbow 44 can also reduce the problem of external stray light entering the detection space and affecting the detection accuracy. The air flows in from the air injection hose 47 and discharges from the exhaust elbow 44, forming a unidirectional flowing air current inside the light-shielding cover 40, which can effectively take away the temperature generated during the operation of the laser generator 19, play a cooling effect on the laser generator 19, and ensure that the laser generator 19 can operate stably.

[0056] In this embodiment, initially, the operator connects the device to the power supply and the control system. At this time, the two light-shielding covers 40 are in a separated state, making the positioning fixture 11 exposed. The operator has previously adjusted the fastening bolt 21 to keep the laser emitted by the laser generator 19 horizontal to meet the detection requirements. Subsequently, the operator places the rolling mill 12 to be detected on the positioning fixture 11. Due to the positioning of the rolling mill 12 by the positioning fixture 11, the center of the rolling mill 12 coincides accurately with the center of the hole formed by the rolls and the guide guard, the rotation axis of the turntable 15, and the axis of the convex lens 37.

[0057] Subsequently, the operator pulls the handle 42 to make the two light-shielding covers 40 approach each other and close. When the two light-shielding covers 40 are closed, the corresponding latches 43 overlap. The operator can insert a bolt into the hole of the overlapping latches 43 to lock the two light-shielding covers 40. At this time, the two light-shielding covers 40 completely shield the detection space, effectively preventing external stray light from entering and interfering with the detection.

[0058] Subsequently, the operator starts the blower 45 through the control system, continuously injects air into the light-shielding cover 40 through the air injection hose 47, and filters the air through the filter 46 before the air enters the light-shielding cover 40, thereby ensuring that the air entering the light-shielding cover 40 is clean and dust-free, and forming a positive pressure inside the light-shielding cover 40, so that external dust will not enter the light-shielding cover 40, avoiding the influence of dust on the detection effect, and the air flow will blow over the laser generator 19 to play a cooling role, ensuring the stable working state of the laser generator 19.

[0059] Meanwhile, the operator starts the laser generator 19 through the control system to emit horizontal laser light, and controls the first motor 23 to drive the lead screw 22 to rotate. Then, the lead screw 22 drives the lead screw seat 24, so that the outer housing 17, the inner housing 18 and the laser generator 19 slide along the linear direction of the sliding groove 16. During the process of the laser generator 19 sliding and adjusting its position, due to the opposite thread directions at both ends of the lead screw 22, the counterweight 25 moves linearly in the direction opposite to the moving direction of the laser generator 19, thereby adjusting the overall center of gravity of the balance turntable 15, avoiding the influence of the center of gravity deviation of the turntable 15 caused by the sliding of the laser generator 19 on its rotational stability, until the laser light emitted by the laser generator 19 is located at the outermost edge of the detection area 48 and then stops.

[0060] Subsequently, the control system automatically controls the second motor 31 to drive the gear 29 to rotate, thereby driving the turntable 15 to rotate stably through the meshing of the gear 29 and the toothed ring 28. As a result, the laser light emitted by the laser generator 19 scans the entire range of the annular detection area 48. Moreover, after the turntable 15 rotates one week, the control system automatically controls the first motor 23 to make the laser generator 19 slide further, so that the rotation radius of the laser generator 19 gradually decreases, in order to achieve a comprehensive scan of the entire range of the detection area 48. In order to ensure the stability of the scanning work, it is necessary to ensure that the rotation speed of the turntable 15 is appropriate, and it should not be too fast to cause unnecessary vibration or centrifugal force to affect the detection accuracy.

[0061] During the process of the laser emitted by the laser generator 19 scanning the detection area 48, if the position irradiated by the laser is blocked by the rolls or the guide guards of the rolling mill 12, the laser beam cannot pass through, and the photosensitive sensor 38 cannot receive the optical signal and outputs a low level. When the laser is not blocked, it irradiates into the cylinder shell 34 and is refracted by the convex lens 37 to irradiate on the photosensitive sensor 38. The photosensitive sensor 38 receives the optical signal and outputs a high level. Then, during the process of the laser generator 19 making a circular motion and gradually reducing the rotation radius, in an ideal state, the hole of the rolling mill 12 is a perfect circle. When the laser makes a circular motion at the contour edge of the hole, when the radius of the circular motion is greater than the diameter of the hole, it is always at a low level, and when it is less than the diameter of the hole, it is always at a low level, and there is only one switching between the high and low levels. In actual detection, if the electrical signal output by the photosensitive sensor 38 shows continuous and irregular fluctuations, and its fluctuation curve is very different from the fluctuation curve in the ideal state, it means that the contour edge of the hole here does not conform to the characteristics of a perfect circle, that is, the hole shape is unqualified.

[0062] Considering factors such as the processing precision error of the rolling mill 12, when the control system compares the actual detected fluctuation curve and the fluctuation curve in the ideal state, it sets an allowable error range. If the difference between the two is within the allowable range, the hole shape can be determined to be qualified. Otherwise, if the difference is too large and exceeds the allowable range, the hole shape is determined to be unqualified, thereby achieving the effect of hole shape detection.

[0063] And this detection method makes the detection data a continuous level fluctuation signal, realizing continuous signal detection, which can more truly and accurately reflect the actual data of the rolling mill hole shape. And when comparing data, compared with the comparison of images, the method of using the fluctuation curve for comparison is more intuitive, which is convenient for the system to make more accurate judgments, thereby improving the detection accuracy and the authenticity of the detection.

[0064] The factors affecting the detection accuracy mainly lie in the diameter of the laser beam and the driving control accuracy when the laser rotates and moves horizontally. These influencing factors are easier to control and easier to achieve technological breakthroughs compared with traditional image detection. With the reduction of the laser beam diameter and the improvement of the control accuracy, the set allowable error range can be further reduced, thereby achieving a more accurate detection effect and having a good development prospect. Moreover, this detection device greatly reduces the production and maintenance costs of the detection device compared with the traditional method using expensive photosensitive imaging elements and telecentric lenses.

[0065] After the rolling mill 12 is detected, the operator turns off the blower 45 and the second motor 31, controls the first motor 23 to drive the laser generator 19 to reset, and then the operator opens the light-shielding cover 40 again and removes the rolling mill 12 to perform the hole shape detection work again.

[0066] The above-mentioned laser generator 19, first motor 23, slip ring 27, second motor 31, photosensitive sensor 38, blower 45, filter 46, etc. are mature existing technologies. The structures in the drawings are only for illustration and will not be elaborated herein.

[0067] As used in the specification and claims, certain terms are used to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. The specification and claims do not use the difference in names as a way to distinguish components, but use the difference in functions of components as the criterion for distinction. As used throughout the specification and claims, the term "comprising" is an open-ended term and should be interpreted as "including but not limited to". "Substantially" means within an acceptable error range. Those skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect.

[0068] It should be noted that the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a commodity or system including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent in such commodity or system. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the commodity or system including the said element.

[0069] The above description shows and describes several preferred embodiments of the present application. However, as mentioned above, it should be understood that the present application is not limited to the form disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the application concept described herein through the above teachings or the technology or knowledge in the relevant field. And any changes and modifications made by those skilled in the art without departing from the spirit and scope of the present application shall fall within the protection scope of the appended claims of the present application.

Claims

1. A pass detection device for a precision rolling mill, characterized in that, The hole detection device of the precision rolling mill comprises: A cabinet (10), wherein a positioning fixture (11) is fixedly connected at a middle position on the cabinet (10), and a rolling mill (12) is arranged on the positioning fixture (11); A laser generator (19), wherein one end of the rolling mill (12) is provided with a laser generator (19) capable of performing circular motion, and one end of the rolling mill (12) away from the laser generator (19) is provided with a laser receiving component; The laser emitted by the laser generator (19) always remains horizontal, and the rotation radius of the laser generator (19) when performing circular motion is variable during the rotation.

2. The pass detection device of a precision rolling mill according to claim 1, characterized in that, A base (13) is fixedly connected to the cabinet (10) at a position corresponding to the laser generator (19); a bearing cover (14) is fixedly connected to the top of the base (13); a turntable (15) is rotatably connected between the base (13) and the bearing cover (14); large-diameter bearings (32) are arranged between the edges of both ends of the turntable (15) and the base (13) and the bearing cover (14); a slide groove (16) is provided at the center of the turntable (15), and the laser generator (19) can slide in the slide groove (16).

3. The hole pattern detection device of a precision rolling mill according to claim 2, characterized in that, An inner shell (18) is fixedly sleeved on the outer side of the laser generator (19), and an outer cover shell (17) is rotatably connected to the outer side of the inner shell (18). An arc groove (20) is provided on the outer cover shell (17), and a fastening bolt (21) passing through the inner shell (18) is provided in the arc groove (20). The inner shell (18) is slidably arranged in the slide groove (16).

4. The hole pattern detection device for a precision rolling mill according to claim 3, characterized in that, The rotating disk (15) is provided with lead screws (22) rotatably connected at both sides of the slide groove (16), and a lead screw seat (24) is threadedly connected at the same side of each lead screw (22). The two lead screw seats (24) are fixedly connected to the inner casing (18). Two mutually symmetrical first motors (23) are respectively arranged at corresponding positions of each lead screw (22) in the rotating disk (15), and the power output end of each first motor (23) is drivingly connected to the corresponding lead screw (22).

5. The hole pattern detection device of a precision rolling mill according to claim 4, characterized in that, A counterweight (25) is threadedly connected to the portion of each lead screw (22) away from the lead screw seat (24); the thread pitches at both ends of each lead screw (22) are the same and the thread directions are opposite; a bracket (26) is fixedly connected to the side of the turntable (15) away from the rolling mill (12); a collector ring (27) that rotates coaxially with the turntable (15) is fixedly connected to the outer side of the bracket (26); the collector ring (27) is electrically connected to the two first motors (23) and the laser generator (19), respectively.

6. The pass detection device of a precision rolling mill according to claim 1, characterized in that, One side of the turntable (15) is fixedly connected with a toothed ring (28). A gear (29) is rotatably connected to the bottom of the base (13) below the toothed ring (28). The gear (29) is in meshing transmission connection with the toothed ring (28). A gear cover (30) covering the gear (29) is fixedly connected to the bottom of the base (13). A second motor (31) is fixedly connected to one side of the base (13) away from the gear (29). The power output end of the second motor (31) passes through the base (13) and is in transmission connection with the gear (29).

7. The pass detection device of a precision rolling mill according to claim 1, characterized in that The laser receiving component includes a support (33). The support (33) is fixedly connected to the cabinet (10). A photosensitive sensor (38) is fixedly connected to one side of the top of the support (33) close to the rolling mill (12). A convex lens (37) is arranged on the side of the photosensitive sensor (38) facing the rolling mill (12). The converging focus of the convex lens (37) is located at the photosensitive sensor (38).

8. The hole pattern detection device of a precision rolling mill according to claim 7, characterized in that, A lens seat (36) is fixedly connected to the edge of the convex lens (37). A cylinder shell (34) covering the convex lens (37) and the photosensitive sensor (38) is arranged outside the lens seat (36). The cylinder shell (34) is fixedly connected to the support (33). A light-transmitting plate (35) is fixedly connected to one end of the cylinder shell (34) away from the support (33).

9. The hole pattern detection device of a precision rolling mill according to claim 1, characterized in that, Two slide rails (39) are symmetrically and fixedly connected to the cabinet (10) on both sides of the rolling mill (12). Two mutually symmetric light-shielding covers (40) are slidably connected to the two slide rails (39). A handle (42) is fixedly connected to the outside of each light-shielding cover (40). Lock catches (43) are fixedly connected to the edges of the two ends of the two light-shielding covers (40) close to each other.

10. The hole pattern detection device of a precision rolling mill according to claim 9, characterized in that, An exhaust elbow (44) is fixedly connected to the side of the light-shielding cover (40) close to the laser generator (19) away from the rolling mill (12). The exhaust elbow (44) is communicated with the inside of the light-shielding cover (40) and bends downward. A blower (45) is fixedly connected to the cabinet (10). A filter (46) is fixedly connected and communicated at the air outlet of the blower (45). An air injection hose (47) is fixedly connected and communicated at one end of the light-shielding cover (40) away from the laser generator (19) and away from the rolling mill (12). One end of the air injection hose (47) away from the light-shielding cover (40) passes through the cabinet (10) and is communicated with the filter (46).

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