Visual detection equipment for bottle cap

Abstract

The invention relates to bottle cap visual detection equipment, which relates to the technical field of bottle cap production quality detection and comprises a first detection table and a second detection table. A rotating disc is arranged on the first detection table, two oppositely-arranged containing grooves are formed in the rotating disc and used for vertically clamping bottle caps, and a top visual detector is arranged above the rotating disc. The second detection table is arranged on one side and provided with a conveying belt, a driving roller and a driven roller, the driving roller and the driven roller drive the conveying belt, and side vision detectors are arranged on the two sides of the conveying belt. And the first detection table and the second detection table are respectively provided with a first rejecting piece and a second rejecting piece for rejecting unqualified bottle caps. By arranging the double-station detection table, the top and the side face of the bottle cap are detected and separated, the intermittent conveying and positioning clamping mechanism is matched, multi-angle, high-efficiency and high-stability automatic visual detection and automatic removal of the bottle cap are achieved, and the detection precision and the production line efficiency are effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bottle cap production quality detection, and particularly relates to a bottle cap visual detection equipment. BACKGROUND

[0002] As an important component of food, beverage, medicine and other packaging containers, the appearance quality of the bottle cap directly affects the sealing, aesthetics and safety of the product. In the production process, the bottle cap may have various quality problems such as printing defects, structural damage, stains and deformation, so it is necessary to conduct strict appearance detection before leaving the factory.

[0003] The traditional bottle cap appearance detection mainly relies on manual visual inspection, which has the disadvantages of low efficiency, high labor intensity, non-uniform detection standard, easy to be affected by subjective factors of the detection personnel, etc., and is difficult to meet the needs of modern large-scale and high-speed production lines. With the development of machine vision technology, automatic visual detection systems have begun to be applied in the field of bottle cap detection. Some existing automatic solutions usually adopt a single station detection table, and image acquisition of the top and side of the bottle cap is performed simultaneously through one or more cameras, and then the image processing system is used for analysis and judgment. However, this kind of scheme still has some deficiencies in actual application: for example, in order to complete multi-angle shooting at one station, a complex rotating or overturning mechanism is often needed to adjust the posture of the bottle cap, which not only increases the mechanical complexity and cost of the equipment, but also affects the detection beat; at the same time, the positioning accuracy of the bottle cap in high-speed conveying is not high, which easily leads to blurred or misaligned imaging, affecting the detection accuracy; in addition, the design of the qualified and unqualified product shunting and removing mechanism after detection is unreasonable, which may lead to incomplete or mistaken removal, affecting the stable operation of the overall production line.

[0004] In summary, the existing bottle cap visual detection equipment still has room for improvement in how to realize multi-angle detection and automatic sorting with high efficiency, high precision and high stability. SUMMARY

[0005] Firstly, the purpose of the present application is to overcome the above technical problems, and to provide a bottle cap visual detection equipment with high detection efficiency, accurate positioning and reliable sorting.

[0006] The application provides a bottle cap visual detection device, which comprises a first detection table and a second detection table, a rotating disc is arranged on the first detection table, a rotating shaft is coaxially and fixedly connected to the center of the rotating disc, the other end of the rotating shaft is arranged in the first detection table, two placing grooves are formed in the rotating disc, the two placing grooves are oppositely arranged, a bottle cap is placed in the placing groove of the rotating disc, the bottle cap is clamped in the placing groove of the rotating disc, a top visual detector is arranged above the first detection table and is used for collecting images of the top of the bottle cap, the second detection table is arranged on one side of the first detection table, a conveying belt is arranged on the second detection table, a driving roller and a driven roller are arranged in the second detection table, the driving roller and the driven roller are engaged with the conveying belt, side visual detectors are arranged on the two sides of the conveying belt of the second detection table and are used for collecting images of the side of the bottle cap, and first and second removing parts are arranged on the first and second detection tables respectively and are used for removing unqualified bottle caps.

[0007] Preferably, a vertical plate is arranged on the first detection table and is vertically arranged on the upper end face of the first detection table, a push cylinder is arranged on the vertical plate and faces the conveying belt of the second detection table, a push rod is fixedly connected to the piston rod of the push cylinder and passes through the vertical plate, and a through hole is formed in the placing groove and is matched with the push rod.

[0008] Through the above technical scheme, after the top detection is completed, the push cylinder can accurately push the qualified bottle cap from the first detection table to the conveying belt of the second detection table, automatic and stable connection between the two detection stations is realized, and the continuity of the device is improved.

[0009] Preferably, the first removing part comprises a vertical plate, the vertical plate is vertically arranged on the upper end face of the first detection table, the vertical plate and the vertical plate are oppositely arranged, a removing cylinder is arranged on the vertical plate, a removing block is connected to the piston rod of the removing cylinder and passes through the vertical plate, and the removing block is matched with the through hole and is used for removing unqualified products on the top of the bottle cap.

[0010] Through the above technical scheme, when the top visual detector finds unqualified products, the removing cylinder is started, the removing block is pushed to push the unqualified bottle cap out of the placing groove through the through hole, rapid and accurate online removal is realized, and the unqualified products are prevented from flowing into the next process.

[0011] Preferably, a driving motor is arranged in the first detection table, a first incomplete gear is coaxially and fixedly connected to the output shaft of the driving motor, and a synchronous wheel is fixedly connected to the bottom end of the rotating shaft and is engaged with the first incomplete gear.

[0012] By adopting the technical scheme, the driving motor drives the first incomplete gear to rotate intermittently, the gear engages to drive the synchronous wheel and the rotating shaft to rotate intermittently, so that the rotating disc is accurately switched between two stations (a feeding / detecting station and a pushing / rejecting station), and stable positioning time is provided for top visual detection and subsequent operation.

[0013] Preferably, the second rejecting member comprises a moving cylinder, the moving cylinder is arranged on the second detection table, a moving block is fixedly connected to a piston rod of the moving cylinder, and the moving block is used for rejecting unqualified bottle caps.

[0014] By adopting the technical scheme, when the side visual detector judges that the bottle cap is unqualified, the moving cylinder drives the moving block to move transversely, and the unqualified bottle cap on the conveying belt is quickly pushed away from the predetermined conveying path, so that automatic sorting after side detection is realized.

[0015] Preferably, a rotating motor is arranged on the side of the second detection table, a second incomplete gear is coaxially fixedly connected to an output shaft of the rotating motor, and a driving roller is coaxially fixedly connected to the driving wheel.

[0016] By adopting the technical scheme, the rotating motor drives the driving roller and the conveying belt to move intermittently through intermittent meshing transmission of the second incomplete gear and the driving wheel, so that the bottle cap can have enough stopping time for image acquisition under the side visual detector during the conveying process, and the clarity and accuracy of side detection are improved.

[0017] In summary, the present application has at least the following advantages: Since the first detection table and the second detection table are separately arranged, the top visual detector and the side visual detector are respectively arranged, the bottle cap is positioned and clamped by the rotating disc, then top detection is performed, and then the bottle cap is conveyed to the conveying belt for side detection, so that the top detection and the side detection of the bottle cap are separated and specialized, the structure is clear, complex posture adjusting mechanisms are avoided, and the detection efficiency and accuracy are significantly improved.

[0018] In the present application, the intermittent motion mechanism driven by the incomplete gear is preferably used to control the start and stop of the rotating disc and the conveying belt, since the intermittent motion can provide a stable and stationary shooting window for visual detection, and provide accurate operation opportunities for pushing, rejecting and other actions, so that high stability and high synchronization of detection and sorting are obtained, and the reliability of the whole machine operation is improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a whole structure schematic diagram of a bottle cap visual detection equipment.

[0020] Figure 2 It is a cross-sectional structure schematic diagram of a bottle cap visual detection equipment.

[0021] Figure 3 is a schematic diagram of the overall structure inside the first detection station.

[0022] Reference signs: 1, detection station assembly; 11, first detection station; 111, rotating disc; 112, placement groove; 113, through hole; 114, rotating shaft; 115, driving motor; 116, first incomplete gear; 117, synchronous wheel; 118, top visual detector; 12, first rejection part; 121, vertical plate; 122, rejection cylinder; 123, rejection block; 124, vertical plate; 125, pushing cylinder; 126, pushing rod; 13, second detection station; 131, conveying belt; 132, driving roller; 133, driven roller; 134, side visual detector; 135, rotating motor; 136, second incomplete gear; 137, driving wheel; 14, second rejection part; 141, moving cylinder; 142, moving block. DETAILED DESCRIPTION

[0023] The application will be further described in detail below in combination with all the drawings.

[0024] Example 1

[0025] With reference to Figure 1 , Figure 2 and Figure 3 , the present embodiment discloses a bottle cap visual detection device, which comprises a first detection station 11 and a second detection station 13. The upper end surface of the first detection station 11 is horizontally arranged, and a circular rotating disc 111 is arranged in the central region. The rotating disc 111 is supported and driven by a rotating shaft 114 fixedly connected coaxially at the center of the rotating disc 111, and the bottom end of the rotating shaft 114 extends downward and is arranged in a cavity inside the first detection station 11. Two placement grooves 112 are formed on the upper surface of the rotating disc 111, and the two placement grooves 112 are symmetrically and oppositely arranged along the diameter direction of the rotating disc 111. The shape of the placement groove 112 matches the bottom profile of the bottle cap to be detected, for example, it can be a circular groove, and the depth is slightly greater than the edge thickness of the bottle cap, so that after the bottle cap is placed, the top end is slightly higher than the upper surface of the rotating disc 111, and the side part can be radially limited by the side wall of the placement groove 112, so as to realize the upper and lower clamping of the bottle cap at the placement groove 112, and prevent shaking or displacement during rotation or detection. Above the first detection station 11, a top visual detector 118 is fixedly installed, for example, a high-resolution industrial camera, and the lens thereof is vertically downward and faces a station (detection station) on the rotating disc 111, for high-definition image acquisition of the top end of the bottle cap stopped at the station.

[0026] With reference to Figure 1 , Figure 2 and Figure 3The second detection station 13 is arranged at the right side (according to the view angle of the drawings) of the first detection station 11, and the two table surfaces are substantially flush. A horizontal conveying belt 131 is arranged on the second detection station 13, which is made of flexible material such as rubber or polyurethane belt, and the surface can be provided with anti-skid lines to increase the friction with the bottle cap. Inside the second detection station 13, a driving roller 132 and a driven roller 133 are arranged in parallel, and the two ends of the driving roller 132 and the driven roller 133 are installed on the frame of the second detection station 13 through bearing seats. The conveying belt 131 is tightly wound around the driving roller 132 and the driven roller 133, and is driven by the friction or meshing teeth between the roller surface and the inner surface of the belt. On both sides of the running path of the conveying belt 131, two side visual detection instruments 134 are symmetrically arranged, such as two line array cameras or area array cameras arranged at an angle, which are used for omnidirectional image acquisition of the side of the bottle cap on the conveying belt 131.

[0027] With reference to Figure 1 , Figure 2 and Figure 3 , the first detection station 11 is provided with a first rejection member 12, and the second detection station 13 is provided with a second rejection member 14, both of which have different structures but are used to reject unqualified bottle caps from the production flow according to the detection results. The first rejection member 12 specifically includes a vertical plate 121 vertically fixed to the right side edge of the upper end surface of the first detection station 11. A rejection cylinder 122 is arranged on the vertical plate 121, the piston rod of the rejection cylinder 122 penetrates through the vertical plate 121 horizontally, and the distal end is fixedly connected with a cylindrical rejection block 123. The size of the rejection block 123 matches the through hole 113 opened at the bottom of the placement groove 112 of the rotating disc 111, and when the bottle cap is located at the position (rejection position) corresponding to the first rejection member 12, the rejection block 123 can be aligned and penetrate through the through hole 113. A vertical plate 124 is arranged on the first detection station 11 opposite to the vertical plate 121 and located at the left side of the rotating disc 111. A push cylinder 125 is arranged on the vertical plate 124, the piston rod of the push cylinder 125 penetrates through the vertical plate 124 horizontally, and the distal end is fixedly connected with a push rod 126. The push rod 126 also matches the through hole 113 at the bottom of the placement groove 112, and is used to push the qualified bottle cap from the rotating disc 111 to the conveying belt 131 of the second detection station 13 on the right side.

[0028] With reference to Figure 1 , Figure 2 and Figure 3A driving motor 115 is installed inside the first detection station 11, the output shaft of the driving motor 115 is vertically upward, and a first incomplete gear 116 is coaxially fixedly connected to the output shaft. A synchronous wheel 117 fixed to the bottom end of the rotating shaft 114 is engaged with the first incomplete gear 116. The tooth profile of the first incomplete gear 116 is designed such that when the toothed part is engaged with the synchronous wheel 117, the rotating disc 111 is driven to rotate 180 degrees; and when the non-toothed part is opposite to the synchronous wheel 117, the rotating disc 111 stops. A rotating motor 135 is installed on the side of the second detection station 13, and a second incomplete gear 136 is coaxially fixedly connected to the output shaft of the rotating motor 135. A driving wheel 137 coaxially fixedly connected to one end of the driving roller 132 is engaged with the second incomplete gear 136. The second incomplete gear 136 is designed to enable the transport belt 131 to advance intermittently, and the advancing distance matches the distance between the bottle caps.

[0029] The implementation principle of the embodiment 1 is as follows: after the equipment is started, the operator or the feeding mechanism places the bottle cap to be detected into the placing groove 112 in the rotating disc 111 which is in the “feeding / detection” position. The driving motor 115 works to drive the rotating disc 111 to rotate 180 degrees through the engagement of the first incomplete gear 116 and the synchronous wheel 117, so that the bottle cap reaches the “top detection / rejection” station. At this time, the top visual detection instrument 118 takes a picture of the top end of the bottle cap, and the image is transmitted to the processing system for analysis. If it is determined to be qualified, the rotating disc 111 is rotated 180 degrees again to make the bottle cap reach the “pushing” station, and another placing groove 112 reaches the “feeding / detection” station, realizing continuous feeding. In the “pushing” station, the pushing cylinder 125 acts, and the pushing rod 126 passes through the through hole 113 to stably push the qualified bottle cap to the transport belt 131 on the right side of the second detection station 13. If the top detection is determined to be unqualified, when the bottle cap reaches the “rejection” station, the rejection cylinder 122 of the first rejection part 12 acts, and the rejection block 123 passes through the through hole 113 to eject the unqualified bottle cap out of the placing groove 112 and fall into the waste collection box. After the bottle cap is pushed onto the transport belt 131, it moves forward along with the intermittent transport belt 131 driven by the rotating motor 135 through the second incomplete gear 136 and the driving wheel 137. Every time the transport belt 131 stops, the side visual detection instrument 134 on both sides simultaneously collects and analyzes the images of the side surface of the bottle cap. If the side detection is qualified, the bottle cap continues to advance to the unloading area along with the transport belt 131; if it is unqualified, the moving cylinder 141 of the second rejection part 14 acts to drive the moving block 142 to horizontally extend and push the unqualified bottle cap away from the transport belt 131 and fall into the waste channel on the side. This cycle realizes the full-automatic, high-efficiency and high-precision visual detection and sorting of the top and side surfaces of the bottle cap.

[0030] Embodiment 2

[0031] The difference of this embodiment is the driving mechanism. In embodiment 1, the intermittent rotation of the rotating disc 111 of the first detection station 11 is achieved by the first incomplete gear 116 and the synchronous wheel 117. In this embodiment, the rotating shaft 114 can be directly driven by a servo motor or a stepping motor, and the accurate 180-degree indexing rotation and pause of the rotating disc 111 can be achieved by programming the controller, which can also achieve the purpose of accurate positioning. The synchronous wheel 117 can be replaced by a common gear or directly connected with the motor output shaft through a shaft coupling. For the driving of the conveying belt 131 of the second detection station 13, embodiment 1 uses the second incomplete gear 136 and the driving wheel 137. This embodiment can be replaced by a servo motor driving the driving roller 132, and the intermittent accurate start-stop and fixed-length conveying of the conveying belt 131 can be achieved by encoder feedback and control program. This electrically controlled intermittent adjustment is more flexible, but the cost is relatively high. The implementation principle is that the accurate position control of the motor replaces the hard positioning of the mechanical incomplete gear, and the accurate pause of each station is achieved, which provides a time window for visual detection and mechanical action.

[0032] Embodiment 3

[0033] The difference of this embodiment is the simplification of part of the structure. In embodiment 1, the first and second removing devices 12 and 14 are independently arranged. This embodiment can consider combining the removing functions. For example, the special removing cylinder 122 and the removing block 123 in the first removing device 12 are cancelled, when the top detection finds that it is unqualified, the controller records the position of the bottle cap, and after it is pushed to the conveying belt 131, the second removing device 14 (moving cylinder 141 and moving block 142) on the second detection station 13 removes it as unqualified product according to the system instruction. In this way, one set of cylinder and actuator is reduced, and the equipment is simplified, but the control system needs to accurately track the position of the bottle cap. The implementation principle is that by optimizing the control logic and using the unified removing point on the conveying belt 131, the mechanical structure is simplified under the premise of ensuring the removing function. In addition, the intermittent movement of the rotating disc 111 can also be considered to be simplified as continuous low-speed rotation, and the top vision detector 118 uses high-speed shutter or trigger shooting to dynamically capture when the bottle cap passes through the detection area, but this will put higher requirements on the camera performance and illumination.

[0034] Embodiment 4

[0035] The embodiment discloses a positioning clamp for a bottle cap visual detection device, which is not a complete device but is used for replacing or improving the structure of the placing groove 112 on the rotating disc 111 in the embodiment 1. The positioning clamp comprises a clamp base which can be fixed on the rotating disc 111, and the base is provided with a profiling groove matched with the bottom profile of the bottle cap. On the side wall of the profiling groove, a plurality of (for example, 3-4) radially adjustable elastic clamping jaws, for example, plastic or metal sliding blocks pressed by springs, are uniformly distributed in the circumferential direction. When the bottle cap is placed, the elastic clamping jaws can adapt to slight deviations of different diameters and gently and stably hold the bottle cap, so that more reliable "up and down clamping" is realized, and the positioning clamp is especially suitable for bottle caps with slight taper or size tolerance. A through hole 113 is also formed in the center of the clamp base, so that the push rod 126 or the ejector block 123 can pass through. By using the positioning clamp, the positioning stability of the bottle cap during high-speed rotation and detection can be improved, and the imaging quality is further improved.

[0036] The above are all preferred embodiments of the application, and do not limit the protection scope of the application, so that: equivalent changes made according to the structure, shape, principle of the application should be covered in the protection scope of the application.

Claims

1. A bottle cap visual inspection apparatus comprising a first inspection stage (11) and a second inspection stage (13), characterized in that, The first detection table (11) is provided with a rotating disc (111), the center of the rotating disc (111) is coaxially and fixedly connected with a rotating shaft (114), the other end of the rotating shaft (114) is arranged in the first detection table (11), two placing grooves (112) are formed in the rotating disc (111), the two placing grooves (112) are oppositely arranged, a bottle cap is placed at the placing groove (112) of the rotating disc (111), and the bottle cap is clamped on the placing groove (112) of the rotating disc (111) in an up-down mode, a top visual detector (118) is arranged above the first detection table (11) and is used for collecting images of the top of the bottle cap, the second detection table (13) is arranged on one side of the first detection table (11), a conveying belt (131) is arranged on the second detection table (13), a driving roller (132) and a driven roller (133) are arranged in the second detection table (13), the driving roller (132) and the driven roller (133) are engaged with the conveying belt (131), side visual detectors (134) are arranged on the two sides of the conveying belt (131) of the second detection table (13) and are used for collecting images of the side of the bottle cap, and first and second removing parts (12) and (14) are arranged on the first and second detection tables (11) and (13) respectively and are used for removing unqualified bottle caps.

2. The bottle cap visual inspection apparatus according to claim 1, wherein The first detection table (11) is provided with a vertical plate (124), the vertical plate (124) is vertically arranged on the upper end surface of the first detection table (11), a push cylinder (125) is arranged on the first vertical plate (124), the push cylinder (125) faces the conveying belt (131) of the second detection table (13), a push rod (126) is fixedly connected with the piston rod of the push cylinder (125) and passes through the vertical plate (124), and a through hole (113) is formed in the placing groove (112) and matches the push rod (126).

3. The bottle cap visual inspection apparatus according to claim 2, wherein The first removing part (12) comprises a vertical plate (121), the vertical plate (121) is vertically arranged on the upper end surface of the first detection table (11), the vertical plate (121) and the vertical plate (124) are oppositely arranged, a removing cylinder (122) is arranged on the vertical plate (121), a removing block (123) is connected with the piston rod of the removing cylinder (122) and passes through the vertical plate (121), the removing block (123) matches the through hole (113) and is used for removing unqualified products on the top of the bottle cap.

4. The bottle cap visual inspection apparatus according to claim 1, wherein A driving motor (115) is arranged in the first detection table (11), a first incomplete gear (116) is coaxially and fixedly connected with the output shaft of the driving motor (115), and the bottom end of the rotating shaft (114) is fixedly connected with a synchronous wheel (117) which is engaged with the first incomplete gear (116).

5. The bottle cap visual inspection apparatus according to claim 1, wherein The second removing part (14) comprises a moving cylinder (141), the moving cylinder (141) is arranged on the second detection table (13), a moving block (142) is fixedly connected with the piston rod of the moving cylinder (141) and is used for removing unqualified bottle caps.

6. The bottle cap visual inspection apparatus according to claim 1, wherein The side of the second detection platform (13) is provided with a rotating motor (135), the output shaft of the rotating motor (135) is coaxially fixedly connected with a second incomplete gear (136), the driving roller (132) is coaxially fixedly connected with a driving wheel (137), and the driving wheel (137) is engaged with the second incomplete gear (136).

Images