Zongzi leaf screening and grading system

Abstract

The present invention discloses a rice dumpling leaf screening and grading system, comprising a first conveyor belt, a feeding hopper arranged at the feeding end of the first conveyor belt, and characterized in that it also comprises a limit assembly arranged in sequence along the rice dumpling leaf conveying direction, a plurality of leveling and leaf separation assemblies, a rice dumpling leaf rejection control module, a leaf surface camera device, a roller conveyor belt connected to the discharge end of the first conveyor belt, a bad rice dumpling leaf rejection assembly, a bad rice dumpling leaf conveying assembly, a second conveyor belt connected to the discharge end of the roller conveyor belt, and a rice dumpling leaf grading assembly. The present invention can automatically level the rice dumpling leaves to adjust the conveying posture of the rice dumpling leaves, and can effectively reduce and control the overlapping leaf rate after the rice dumpling leaves are fed and conveyed, and can also realize the automatic rejection of unqualified rice dumpling leaves, and automatically grade the rice dumpling leaves, greatly improving the efficiency of screening and grading the rice dumpling leaves.

Description

Technical Field

[0001] The invention belongs to the technical field of rice dumpling leaf processing equipment, and particularly relates to a rice dumpling leaf screening and grading system. Background Art

[0002] Zong leaves are one of the essential ingredients for making Zongzi, a food eaten on the Dragon Boat Festival. The scientific name of Zong leaves is Indigo leaves, which contain a large amount of chlorophyll and various amino acids that are beneficial to the human body. They have a fragrant smell and give you a feeling of returning to nature. Zong leaves can be used not only to wrap Zongzi, but also to wrap other foods, decorate the table, and serve as a foil for food. They can also be used to weave utensils, make lunch boxes, and cut into various shapes. Because Zong leaves grow naturally, are non-toxic and pollution-free, can be harvested every year and every season, and have the characteristics of being "disposable" and pollution-free, Zong leaves play an irreplaceable role in the field of food packaging.

[0003] During the processing of zongzi leaves, the harvested zongzi leaves need to be cleaned, screened, graded and other pre-processed, and then dried and stored and transported before they can be sold and used in the market. At present, the cleaning of zongzi leaves can be operated mechanically, which is efficient and has a good cleaning effect. However, since zongzi leaves are thin sheets, light in weight, and have a certain toughness, it is difficult to develop a screening and grading device suitable for zongzi leaves. Although the related zongzi leaf screening device or system is disclosed in the prior art, they still have some defects or room for improvement.

[0004] For example, a Chinese patent (application number 201911128982.1) discloses a stackable rice dumpling leaf sorting and unloading device and its use method, which includes at least one layer of unloading devices, multiple layers of unloading devices are stacked on each other, there is only one unloading device on the top layer, the number of unloading devices on the lower layer is four times that of the unloading devices on the upper layer, and the corresponding number of layers is arranged according to the number of grades; each layer of unloading devices adopts the same structure, wherein the unloading device on the top layer is provided with an input conveying device for feeding; each layer of unloading devices includes a frame structure, a feed port is fixed at the center of the frame structure, and four independent moving channels are respectively docked in four directions directly below the feed port, and the moving channels are slidably mounted on a support plate through a moving mechanism, and the support plate is respectively fixedly mounted in four directions of the frame structure, and the bottom of the moving channel is docked with an output conveying device. Although this technical solution can realize multi-level, high-speed, and high-efficiency automatic unloading of rice dumpling leaves, it can also achieve its efficient sorting. However, the device has a complex structure and needs to control the feeding of the rice dumplings leaves one by one in order to better realize its function, and unqualified rice dumplings leaves cannot be removed.

[0005] For another example, a Chinese patent (application number 202011136837.0) discloses an automatic sorting device for zongzi leaves, including a support frame, a first active roller arranged at one end of the support frame, a first driven roller arranged at the other end of the support frame, a first conveying belt connected to the first active roller and the first driven roller, and a grading device, wherein the grading device is arranged at the support frame and is provided with a first active roller end, and a motor is arranged in the first active roller; the grading device has a first support plate, a second support plate, a second active roller arranged between the first support plate and the second support plate, a second driven roller, a third active roller, a third driven roller, a second conveying belt connected to the second active roller and the second driven roller, and a third conveying belt connected to the third active roller and the third driven roller. Although the automatic sorting device for zongzi leaves is reliable, efficient, and has low working noise, the zongzi leaves are neatly arranged when they are sorted and fall into the designated area. Different sorting levels can be designed according to needs without changing the principle, and the applicability is strong. However, the device can only sort the leaves according to their width, but cannot sort them according to their length; similarly, the device also needs to control the feeding of each piece to better realize its function, and it cannot remove unqualified leaves.

[0006] In addition, during the research and development, design and actual use of the rice leaf processing equipment, the applicant found that after the rice leaves were fed into the equipment, the leaf area of ​​the rice leaves was large and they were easy to stick to or overlap each other, which caused the rice leaves entering the processing equipment to overlap with each other. In particular, it was not easy to find when 2 to 3 leaves overlapped and stuck together. A large number of sticky and overlapping rice leaves would affect the screening and grading effects after entering subsequent processes. Summary of the invention

[0007] In response to the problems mentioned in the background technology, the present invention provides a system for screening and grading rice dumplings leaves, which can automatically level the rice dumplings leaves to adjust the conveying posture of the rice dumplings leaves, and can effectively reduce and control the overlapping rate of the rice dumplings leaves after feeding and conveying, and can also realize the automatic removal of unqualified rice dumplings leaves and automatic grading of rice dumplings leaves, thereby greatly improving the efficiency of screening and grading of rice dumplings leaves.

[0008] The present invention is achieved through the following technical solutions.

[0009] The rice dumpling leaf screening and grading system comprises a first conveyor belt, a feeding hopper arranged at the feeding end of the first conveyor belt, and is characterized in that it also comprises a limit assembly, a plurality of leveling and leaf separation assemblies, a rice dumpling leaf rejection control module, a leaf surface camera device, a roller conveyor belt connected to the discharge end of the first conveyor belt, a bad rice dumpling leaf rejection assembly, a bad rice dumpling leaf conveying assembly, a second conveyor belt connected to the discharge end of the roller conveyor belt, and a rice dumpling leaf grading assembly;

[0010] The limiting assembly comprises a plurality of baffle separation plates uniformly arranged in sequence along the conveying direction of the rice dumplings, and the distance between the bottom edge of the plurality of baffle separation plates and the conveying surface of the first conveyor belt decreases in sequence along the conveying direction of the rice dumplings;

[0011] A plurality of the leveling and leafing assemblies are uniformly arranged in sequence above the first conveyor belt along the conveying direction of the rice dumplings, and the leveling and leafing assemblies include a leveling and leafing roller, which rotates in an anti-parallel manner relative to the conveying surface of the first conveyor belt, and the rotational linear speed of the leveling and leafing roller is 0.7 to 0.9 times the conveying speed of the first conveyor belt;

[0012] The distances between the bottom edges of the plurality of baffle separation plates and the conveying surface of the first conveyor belt, and the distances between the lowest rotating sections of the leveling and leaf separation rollers of the plurality of leveling and leaf separation assemblies and the conveying surface of the first conveyor belt decrease in sequence along the conveying direction of the rice dumplings;

[0013] The leaf surface camera device is arranged at the discharge end of the first conveyor belt to collect leaf surface image data of the zongzi leaves conveyed on the first conveyor belt, and send the leaf surface image data to the zongzi leaves rejection control module;

[0014] The rice dumpling leaf rejection control module is used to receive the real-time leaf surface image data sent by the leaf surface camera device to identify and judge whether the appearance of the rice dumpling leaf is qualified. If the appearance of the rice dumpling leaf is unqualified, a rejection instruction is issued to the bad rice dumpling leaf rejection component to reject the unqualified rice dumpling leaf;

[0015] The bad rice dumpling leaf rejection component includes an air nozzle group, which is arranged between the rollers of the roller conveyor belt, and its jet end face is slightly lower than the conveying surface of the roller conveyor belt or flush with the conveying surface of the roller conveyor belt. The air nozzle group is used to receive the rejection instruction sent by the rice dumpling leaf rejection control module and spray high-speed airflow from the bottom to the conveying surface of the roller conveyor belt to blow the rice dumpling leaves transported on the roller conveyor belt away to above the conveying surface;

[0016] The bad rice dumpling leaf conveying assembly is used to collect and convey the bad rice dumpling leaves blown off and rejected from the roller conveyor belt;

[0017] The second conveyor belt comprises a middle conveying surface connected to the discharge end of the roller conveyor belt, and two side conveying surfaces arranged on both sides of the middle conveying surface, and the conveying surface widths of the middle conveying surface and the two side conveying surfaces are not less than the width of the conveying surface of the roller conveyor belt;

[0018] The rice leaf grading component includes a rice leaf grading control module, a leaf size detection device and a leaf distribution device arranged in sequence along the conveying direction of the second conveyor belt; the leaf size detection device is used to detect the length or width of the rice leaves conveyed on the median conveying surface to obtain the length or width data of the rice leaves; the rice leaf grading control module is used to issue instructions according to the length or width data to control the blade distribution device to distribute the rice leaves to different conveying surfaces of the second conveyor belt.

[0019] Preferably, the leveling and leaf-separating assembly further comprises a driving motor, a rotating shaft having one end connected to the power output end of the driving motor and the other end fixedly connected to the leveling and leaf-separating roller.

[0020] Preferably, a buffer ring sleeve is fixedly provided on the outer ring sleeve of the leveling and leaf-separating roller.

[0021] Preferably, the system of the present invention further comprises the stacked leaf suction assembly;

[0022] The leaf stacking suction assembly is arranged between the leveling leaf separation roller at the very end and the leaf surface camera device, and the leaf stacking suction assembly includes a leaf stacking suction control module, a suction disc arranged 3 to 5 mm higher than the conveying surface of the first conveyor belt, and a front-end leaf stacking thickness sensor and a rear-end leaf stacking thickness sensor arranged adjacent to the front and rear ends of the suction disc in the direction of the rice dumplings; the front-end leaf stacking thickness sensor and the rear-end leaf stacking thickness sensor are used to respectively collect the front-end thickness data of the rice dumplings at the front-end position and the rear-end thickness data of the rice dumplings at the rear-end position at the position on the conveying surface of the first conveyor belt just below the suction disc, and send the front-end thickness data and the rear-end thickness data to the leaf stacking suction control module; the leaf stacking suction control module is used to receive and analyze the front-end thickness data and the rear-end thickness data, and when the front-end thickness data and the rear-end thickness data both exceed the set threshold value, a suction command is issued to the suction disc to extract the upper layer of rice dumplings stacked on the conveying surface of the first conveyor belt from the conveying surface, and then the suction is stopped in time to lower the extracted rice dumplings to the unloaded conveying surface of the first conveyor belt.

[0023] Preferably, the defective rice dumpling leaf conveying assembly comprises an upper conveyor belt and a lower conveyor belt, and the upper conveyor belt and the lower conveyor belt are both inclined along the conveying direction of the roller conveyor belt, and the lower conveyor belt comprises a lower feeding conveying section and a lower discharging conveying section, and the lower feeding conveying section is arranged at an angle with the upper conveyor belt to form an inverted V-shaped rice dumpling leaf feeding port, and the rice dumpling leaf feeding port is located directly above the air nozzle group, and the rice dumpling leaf feeding port is used to convey the defective rice dumpling leaves blown off from the roller conveyor belt by the air nozzle group, and the lower discharging conveying section is arranged parallel to the discharging end of the upper conveyor belt.

[0024] Preferably, the blade distribution device includes a distribution bracket arranged across the second conveyor belt, a walking trolley that can move on the distribution bracket along the width direction of the conveying surface of the second conveyor belt, and two distribution rods connected to the bottom of the walking trolley and arranged in a close fit on the conveying surface of the second conveyor belt; the distance between the two distribution rods is the same as the width of the conveying surface of the roller conveyor belt; the rice leaf grading control module is used to issue instructions according to the length or width data to control the walking trolley to move horizontally on the distribution bracket, thereby driving the distribution rods to distribute the rice leaves to different conveying surfaces of the second conveyor belt.

[0025] Preferably, the mating ends of the two dividing rods and the conveying surface of the second conveyor belt are provided with bristles.

[0026] Preferably, the limiting assembly comprises three barrier separation plates which are evenly arranged in sequence along the conveying direction of the rice dumplings, and the distances between the bottom edges of the three barrier separation plates and the conveying surface of the first conveyor belt are 20-30 mm, 15-20 mm, and 8-12 mm respectively along the conveying direction of the rice dumplings.

[0027] Preferably, the number of the leveling and leafing assemblies is five, and the distances between the lowest rotating cross-sections of the leveling and leafing rollers of the five leveling and leafing assemblies and the conveying surface of the first conveyor belt are 6-8 mm, 4-6 mm, 3-4 mm, 2-3 mm, and 1-2 mm respectively along the conveying direction of the rice dumplings.

[0028] Preferably, the discharge end of the defective rice dumpling leaf conveying assembly is provided with a defective rice dumpling leaf conveying belt connected thereto.

[0029] Beneficial effects of the present invention:

[0030] 1) The present invention is aimed at thin and light rice leaves, and can automatically flatten the rice leaves to adjust the conveying posture of the rice leaves. At the same time, it can effectively reduce and control the overlapping rate of the rice leaves after feeding and conveying, so as to facilitate subsequent rejection and classification operations.

[0031] 2) The present invention can also realize automatic removal of unqualified rice dumpling leaves and automatic grading of rice dumpling leaves, thereby greatly improving the efficiency of screening and grading of rice dumpling leaves. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of the rice dumpling leaf screening and grading system of the present invention;

[0033] Figure 2 A top view of a system for screening and grading rice dumplings leaves according to the present invention;

[0034] Figure 3 It is a structural schematic diagram of the rejection and grading sections of the rice dumpling leaf screening and grading system of the present invention;

[0035] Figure 4It is a top view of the rejection and grading section of the rice dumpling leaf screening and grading system of the present invention;

[0036] Figure 5 for Figure 1 Cross-section at AA in the middle;

[0037] Figure 6 for Figure 1 Cross-section at the middle BB;

[0038] Figure 7 for Figure 1 Cross-section at the middle CC;

[0039] Figure 8 It is a structural enlarged schematic diagram of the rejection section of the rice dumpling leaf screening and grading system of the present invention;

[0040] Fig. 9 It is a structural enlarged schematic diagram of the grading section of the rice dumpling leaf screening and grading system of the present invention;

[0041] Fig.10 for Figure 1 Sectional view at DD in the middle;

[0042] The meanings of the symbols in the above figure are as follows: first conveyor belt 1, feeding hopper 2, limiting assembly 3, leveling and leaf separation assembly 4, zongzi leaf rejection control module 5, leaf surface camera device 6, roller conveyor belt 7, bad zongzi leaf rejection assembly 8, bad zongzi leaf conveying assembly 9, second conveyor belt 10, zongzi leaf grading assembly 11, baffle separation plate 12, leveling and leaf separation roller 13, air nozzle group 14, middle conveying surface 15, side conveying surface 16, zongzi leaf grading control module 17, leaf size detection device 18, leaf sorting device 1 9, driving motor 20, buffer ring sleeve 21, leaf stacking suction assembly 22, leaf stacking suction control module 23, suction disc 24, front leaf stacking thickness sensor 25, rear leaf stacking thickness sensor 26, upper conveyor belt 27, lower conveyor belt 28, lower feeding conveying section 29, lower discharging conveying section 30, rice leaf feeding port 31, distribution bracket 32, walking trolley 33, distribution rod 34, bristles 35, bad rice leaf conveyor belt 36, machine cover 37, rice leaf 38, shift plate 39, infrared sensor 40. DETAILED DESCRIPTION

[0043] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc., are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0045] See also Figures 1 to 10 The rice dumpling leaf screening and grading system comprises a first conveyor belt 1, a feeding hopper 2 arranged at the feeding end of the first conveyor belt 1, a limiting component 3 arranged in sequence along the rice dumpling leaf conveying direction, a plurality of leveling and leaf separation components 4, a rice dumpling leaf rejection control module 5, a leaf surface camera device 6, a roller conveyor belt 7 connected to the discharge end of the first conveyor belt 1, a bad rice dumpling leaf rejection component 8, a bad rice dumpling leaf conveying component 9, a second conveyor belt 10 connected to the discharge end of the roller conveyor belt 7, and a rice dumpling leaf grading component 11;

[0046] Wherein, the first conveyor belt 1 is preferably a polyurethane food conveyor belt, and the conveying surface width of the first conveyor belt 1 is 14-16 cm, so as to control the conveying surface of the first conveyor belt 1 to be about 5 cm wider than the leaf surface width of high-quality rice dumplings; the limiting component 3 includes a plurality of baffle separation plates 12 uniformly arranged in sequence along the rice dumpling conveying direction; a plurality of the leveling and leaf separation components 4 are uniformly arranged in sequence above the first conveyor belt 1 along the rice dumpling conveying direction, and the leveling and leaf separation components 4 include a leveling and leaf separation roller 13, and the leveling and leaf separation roller 13 rotates in the opposite direction to the conveying surface of the first conveyor belt 1; the distance between the bottom edge of the plurality of the baffle separation plates 12 and the conveying surface of the first conveyor belt 1, and the distance between the lowest rotating section of the leveling and leaf separation roller 13 of the plurality of leveling and leaf separation components 4 and the conveying surface of the first conveyor belt 1 decreases in sequence along the rice dumpling conveying direction;

[0047] Based on the above structure, when the rice leaves are fed into the feeding end of the first conveyor belt 1 through the feeding hopper 2, the rice leaves are stacked at the feeding end of the first conveyor belt 1, and the stacked rice leaves are blocked by the limiting component 3, so that the stacking thickness of the stacked rice leaves is gradually reduced when being transported on the conveying surface, and then the stacked rice leaves enter the process section of the leveling and leaf-separating component 4; in the process section of the leveling and leaf-separating component 4, a certain gap is left between the lowest rotating section of the leveling and leaf-separating roller 13 and the conveying surface of the first conveyor belt 1. Therefore, when the stacked rice leaves pass through the leveling and leaf-separating roller 13, the rice leaves on the uppermost layer are in contact with the leveling and leaf-separating roller 13, while the rice leaves on the lowermost layer are in contact with the conveying surface of the first conveyor belt 1, and the remaining rice leaves are in contact with each other. Since the leveling and leaf-separating roller 13 rotates in the opposite direction and parallel to the conveying surface of the first conveyor belt 1, and the rotation of the leveling and leaf-separating roller 13 The moving line speed is 0.7 to 0.9 times the conveying speed of the first conveyor belt 1, so that the conveying speed of the uppermost layer of zongzi leaves is lower than that of the lowermost layer of zongzi leaves, so that the uppermost layer of zongzi leaves is separated from the stacked zongzi leaves. Similarly, different zongzi leaves in the middle part will also be separated from each other due to different conveying speeds, so that the stacked zongzi leaves are continuously separated when passing through different leveling and leaf-separating rollers 13 in sequence, and the leveling and leaf-separating rollers 13 rotate in the reverse parallel direction relative to the conveying surface of the first conveyor belt 1 without hindering the forward conveying of the zongzi leaves; at the same time, when the stacked zongzi leaves are separated, the pressure of the leveling and leaf-separating rollers 13 can also level the zongzi leaves, so that the zongzi leaves are transported smoothly on the conveyor belt, which is beneficial to the subsequent process; after the above-mentioned process section, the zongzi leaves will continue to be transported forward on the first conveyor belt piece by piece;

[0048] The leaf surface camera device 6 is arranged at the discharge end of the first conveyor belt 1 to collect leaf surface image data of the zongzi leaves conveyed on the first conveyor belt 1, and send the leaf surface image data to the zongzi leaves removal control module 5;

[0049] The zongzi leaf rejection control module 5 is used to receive the real-time leaf surface image data sent by the leaf surface camera device 6 to identify and judge whether the appearance of the zongzi leaf is qualified. If the appearance of the zongzi leaf is unqualified, a rejection instruction is issued to the bad zongzi leaf rejection component 8 so that the unqualified zongzi leaf is rejected; the unqualified zongzi leaf appearance means that the zongzi leaf is broken, has yellow spots, and has insect eyes; usually the leaf surface of a qualified zongzi leaf should be bright green throughout. When there are fractures, yellow spots, and insect eyes at a certain position on the zongzi leaf surface, the color at this position is greatly different from the leaf surface color, that is, color abnormality occurs; the zongzi leaf rejection control module 5 can analyze the leaf surface image data, thereby identifying the above-mentioned color abnormality phenomenon whether the leaf exists, and then identifying and judging whether the appearance of the zongzi leaf is qualified;

[0050] The defective rice dumpling leaf removal component 8 includes an air nozzle group 14, which is arranged between the rollers of the roller conveyor belt 7, and its jet end face is slightly lower than the conveying surface of the roller conveyor belt 7 or flush with the conveying surface of the roller conveyor belt 7, so that the air nozzle group 14 does not affect the normal conveying of the rice dumpling leaves by the roller conveyor belt 7; the air nozzle group 14 is used to receive the removal instruction sent by the rice dumpling leaf removal control module 5 and spray a high-speed airflow from the bottom to the conveying surface of the roller conveyor belt 7, so as to blow the rice dumpling leaves transported on the roller conveyor belt 7 away to above the conveying surface; in order to enable the air nozzle group 14 to effectively blow the rice dumpling leaves upward, the air nozzle group 14 includes a plurality of air nozzles, and the airflow blown by the plurality of air nozzles Should be able to cover the area of ​​a complete rice dumpling leaf; Since the air nozzle group 14 is arranged at the position of the roller conveyor belt 7, and the roller conveyor belt 7 is connected to the first conveyor belt, but the leaf surface camera device 6 is arranged at the discharge end of the first conveyor belt 1, the air nozzle group 14 is in the downstream position of the leaf surface camera device 6 (along the conveying direction of the first conveyor belt), the bad rice dumpling leaf removal component 8 receives the removal instruction, and the air nozzle group 14 can delay the blowing of the airflow, or the leaf surface camera device 6 delays the issuance of the removal instruction, and the delay time can be calculated and determined according to the conveying speed of the first conveyor belt, the roller conveyor belt, and the distance between the leaf surface camera device 6 and the air nozzle group 14, which will not be further repeated here;

[0051] The bad rice dumpling leaf conveying assembly 9 is used to collect and convey the unqualified rice dumpling leaves blown off and rejected from the roller conveyor belt 7;

[0052] The second conveyor belt 10 includes a middle conveying surface 15 connected to the discharge end of the roller conveyor belt 7, and two side conveying surfaces 16 respectively arranged on both sides of the middle conveying surface 15, and the conveying surface widths of the middle conveying surface 15 and the two side conveying surfaces 16 are not less than the width of the conveying surface of the roller conveyor belt 7;

[0053] The zongzi leaf grading assembly 11 includes a zongzi leaf grading control module 17, a leaf size detection device 18 and a leaf distribution device 19 sequentially arranged along the conveying direction of the second conveyor belt 10; the leaf size detection device 18 is used to detect the size of the zongzi leaves conveyed on the median conveying surface 15 to obtain the length or width data of the zongzi leaves; the zongzi leaf grading control module 17 is used to issue instructions according to the length or width data to control the leaf distribution device 19 to distribute the zongzi leaves to different conveying surfaces of the second conveyor belt 10; usually, the zongzi leaves can be graded according to their length or width, and generally divided into three grades to meet general processing requirements, and through the above-mentioned leaf size detection device 18, the leaf distribution device 19, the zongzi leaf grading control module 17 and the second conveyor belt 10, the zongzi leaves of three different grades are respectively conveyed through the median conveying surface 15 and the two side conveying surfaces 16 to achieve the purpose of grading; specifically, the leaf size detection device 18 can select a camera of suitable specifications, and use zongzi leaves of known size as a calibration object, and combine OpenCV software to measure the size of the conveyed zongzi leaves in real time to obtain the length and width data of the zongzi leaves;

[0054] Furthermore, in a preferred embodiment, the leveling and leafing assembly 4 also includes a driving motor 20 , a rotating shaft having one end connected to the power output end of the driving motor 20 and the other end fixedly connected to the leveling and leafing roller 13 .

[0055] In order to prevent the leveling and leaf-separating roller 13 from causing mechanical damage to the rice leaves when in contact with the rice leaves, further, in a preferred embodiment, the outer ring sleeve of the leveling and leaf-separating roller 13 is fixedly provided with a buffer ring sleeve 21; the buffer ring sleeve 21 is preferably made of rubber.

[0056] Further, in a preferred embodiment, the rice dumpling leaf screening and grading system of the present invention further comprises the stacked leaf suction assembly 22;

[0057] The leaf stacking suction assembly 22 is arranged between the leaf leveling roller and the leaf surface camera device at the very end (along the conveying direction of the first conveyor belt), and the leaf stacking suction assembly 22 includes a leaf stacking suction control module 23, a suction disc 24 arranged 3 to 5 mm higher than the conveying surface of the first conveyor belt 1, and a front-end leaf stacking thickness sensor 25 and a rear-end leaf stacking thickness sensor 26 arranged adjacent to the front and rear ends of the suction disc 24 in the direction of the leaves; the front-end leaf stacking thickness sensor 25 and the rear-end leaf stacking thickness sensor 26 are used to respectively collect the front-end thickness data of the leaves at the front-end position and the rear-end thickness data of the leaves at the rear-end position at the position on the conveying surface of the first conveyor belt 1 just below the suction disc, and transmit the front-end thickness data and the rear-end thickness data to the leaves. The front end thickness data is sent to the leaf stacking suction control module 23; the leaf stacking suction control module 23 is used to receive and analyze the front end thickness data and the rear end thickness data, and when the front end thickness data and the rear end thickness data both exceed the set threshold value, a suction instruction is issued to the suction disc 24 to extract the upper layer of zongzi leaves stacked on the conveying surface of the first conveyor belt 1 from the conveying surface, and then the suction is stopped in time to lower the extracted zongzi leaves to the unloaded conveying surface of the first conveyor belt 1; preferably, the suction end face of the suction disc 24 is elliptical, and its coverage area is 0.6 to 0.8 times the area of ​​a complete zongzi leaf; the above threshold value should be slightly larger than the thickness of a zongzi leaf, and generally the threshold value is 1.2 to 1.5 mm; the front end leaf stacking thickness sensor 25 The rear-end stacked leaf thickness sensor 26 can select a short-distance laser rangefinder with an accuracy of 0.1mm; specifically, an electromagnetic valve is provided on the suction disc 24, and the electromagnetic valve is electrically connected to the stacked leaf suction control module 23, so as to receive the control signal of the stacked leaf suction control module 23 to open, so that the suction disc 24 sucks to remove the upper layer of zongzi leaves stacked on the conveying surface of the first conveyor belt 1 from the conveying surface, or closes in time to stop the suction of the suction disc 24, so as to lower the overlapped zongzi leaves that have been removed to the unloaded conveying surface of the first conveyor belt 1; specifically, in order to determine whether the first conveyor belt 1 is in an unloaded state, a solenoid valve connected to the stacked leaf suction control module 23 is provided below the suction disc 24 and located on at least one side of the first conveyor belt. The infrared sensor 40 connected to the block 23 is used to identify whether the first conveyor belt below the suction disc 24 is unloaded; more specifically, the leaf stacking suction control module 23 receives and analyzes the front-end thickness data and the rear-end thickness data in real time. If the front-end thickness data and the rear-end thickness data both exceed the set threshold value, the leaf stacking suction control module 23 issues a suction command to the suction disc 24 to extract the upper layer of zongzi leaves stacked on the conveying surface of the first conveyor belt 1 from the conveying surface. If the infrared sensor 40 then identifies that the first conveyor belt below the suction disc 24 is in an unloaded state, the leaf stacking suction control module 23 issues a command to control the suction disc 24 to stop suction, so as to lower the extracted zongzi leaves to the unloaded conveying surface of the first conveyor belt 1;

[0058] Through the above-mentioned leaf stacking suction component 22, after being leveled and separated by multiple leveling and leaf separating components 4, if there are still overlapping leaves, the thickness of the overlapping leaves will be greater than the thickness of normal leaves. The leaf stacking suction component 22 can be used to extract the leaves on the top layer from the conveying surface, and then place them on the unloaded conveying surface, thereby further reducing the probability of overlapping leaves on the conveyor belt, which can improve the accuracy of subsequent unqualified leaves and leaf grading.

[0059] Furthermore, in a preferred embodiment, the rice leaf screening and grading system of the present invention also includes two shift plates 39, which are symmetrically arranged on the first conveyor belt 1 at the front end of the stacked leaf suction assembly 22, so as to shift the conveyed rice leaves so that the rice leaves are conveyed along the middle position of the conveying surface of the first conveyor belt 1, so that the rice leaves can be better sucked by the suction disc 24; specifically, the distance between the two shift plates 39 is gradually reduced along the direction of rice leaf conveying, and the shift plates 39 are elastic metal sheets.

[0060] Furthermore, in a preferred embodiment, the defective rice dumpling leaf conveying assembly 9 includes an upper conveyor belt 27 and a lower conveyor belt 28, and the upper conveyor belt 27 and the lower conveyor belt 28 are both inclined along the conveying direction of the roller conveyor belt 7, and the lower conveyor belt 28 includes a lower feeding conveying section 29 and a lower discharging conveying section 30, and the lower feeding conveying section 29 is arranged at an angle with the upper conveyor belt 27 to form an inverted V-shaped rice dumpling leaf feeding port 31, and the rice dumpling leaf feeding port 31 is located directly above the air nozzle group 14, and the lower discharging conveying section 29 is arranged parallel to the discharging end of the upper conveyor belt 27.

[0061] Furthermore, in a preferred embodiment, the defective rice dumpling leaf conveying assembly 9 also includes a hood 37, which covers the upper conveyor belt 27 and the lower conveyor belt 28 and is open at the lower and upper ends, thereby forming an air flow channel, so that the air flow blown by the air nozzle group 14 flows in the hood 37 along the rice dumpling leaf conveying direction, so that the rice dumpling leaves can be better conveyed in coordination with the upper conveyor belt 27 and the lower conveyor.

[0062] Furthermore, in a preferred embodiment, the leaf distributing device 19 includes a distribution bracket 32 ​​arranged across the second conveyor belt 10, a walking trolley 33 that can move on the distribution bracket 32 ​​along the width direction of the conveying surface of the second conveyor belt 10, and two distribution rods 34 connected to the bottom of the walking trolley 33 and arranged on the conveying surface of the second conveyor belt 10; the distance between the two distribution rods 34 is the same as the conveying surface width of the roller conveyor belt 7; the rice leaf grading control module 17 is used to issue a signal according to the length data The instruction controls the walking trolley 33 to move horizontally on the distribution bracket 32, thereby driving the distribution rod 34 to distribute the rice dumplings to different conveying surfaces of the second conveyor belt 10 and reset (resetting is to control the walking trolley 33 to move horizontally on the distribution bracket 32 ​​to a position just above the middle conveying surface 15, so that the two distribution rods 34 are respectively located at the edges of both sides of the middle conveying surface 15); for example, in order to classify the rice dumplings into three levels: those with a length greater than 42 cm, those with a length of 38 to 42 cm, and those with a length less than 38 cm, the middle conveying surface can be used to distribute the rice dumplings to different conveying surfaces of the second conveyor belt 10 and reset (resetting is to control the walking trolley 33 to move horizontally on the distribution bracket 32 ​​to a position just above the middle conveying surface 15, so that the two distribution rods 34 are respectively located at the edges of both sides of the middle conveying surface 15). 15, the two lateral conveying surfaces 16 respectively convey three grades of zongzi leaves, that is, the middle conveying surface 15 conveys zongzi leaves with a length greater than 42 cm, one lateral conveying surface 16 conveys zongzi leaves with a length of 38 to 42 cm, and the other lateral conveying surface 16 conveys zongzi leaves with a length less than 38 cm; specifically, since the middle conveying surface 15 is connected to the roller conveyor belt 7, the zongzi leaves will be conveyed from the roller conveyor belt 7 to the middle conveying surface 15 of the second conveyor belt 10 piece by piece, and at this time, the leaf size detection device 18 will detect the conveyed zongzi leaves. The size of the incoming zongzi leaves is detected. If the length of the zongzi leaves is greater than 42 cm, the zongzi leaf grading control module 17 issues an instruction to control the walking trolley 33 not to move, so that the zongzi leaves conveyed at this time continue to be conveyed forward on the median conveying surface 15. If the length of the zongzi leaves is 38 to 42 cm or the length of the zongzi leaves is less than 38 cm, the zongzi leaf grading control module 17 issues an instruction to control the walking trolley 33 to move to the side conveying surface 16 on the corresponding side, so that the zongzi leaves conveyed at this time continue to be conveyed forward on the side conveying surface 16 on the corresponding side.

[0063] Furthermore, in a preferred embodiment, the two distribution rods 34 are provided with bristles 35 at the fitting ends with the conveying surface of the second conveyor belt 10; since the rice leaves are in the form of thin sheets, they are in fitting contact with the conveying surface of the second conveyor belt 10 through the bristles 35. Firstly, the friction between the bristles 35 and the conveying surface of the second conveyor belt 10 is small when they move relative to each other, which will not affect the lateral movement of the distribution rod 34; secondly, the bristles can also effectively distribute and push the rice leaves.

[0064] Furthermore, in a preferred embodiment, the limiting assembly 3 includes three barrier separation plates 12 uniformly arranged in sequence along the conveying direction of the rice dumplings, and the distances between the bottom edges of the three barrier separation plates 12 and the conveying surface of the first conveyor belt 1 are 20-30 mm, 15-20 mm, and 8-12 mm respectively along the conveying direction of the rice dumplings.

[0065] Furthermore, in a preferred embodiment, the number of the leveling and leafing assemblies 4 is five, and the distances between the lowest rotating cross-sections of the leveling and leafing rollers 13 of the five leveling and leafing assemblies 4 and the conveying surface of the first conveyor belt 1 are 6-8 mm, 4-6 mm, 3-4 mm, 2-3 mm, and 1-2 mm respectively along the conveying direction of the rice dumplings.

[0066] In order to facilitate the collection and processing of the rejected unqualified rice dumplings leaves, further, in a preferred embodiment, the discharge end of the bad rice dumpling leaf conveying component 9 is provided with a bad rice dumpling leaf conveyor belt 36 connected thereto.

[0067] The working process of utilizing the present invention to screen and classify rice dumpling leaves is as follows:

[0068] The zong leaves are put into the feeding end of the first conveyor belt 1 through the feeding hopper 2. At this time, the zong leaves are stacked and placed. Driven by the conveying surface of the first conveyor belt 1, the zong leaves are stacked and conveyed forward. Thereafter, through the blocking and limiting effect of the plurality of blocking and separating plates 12, as the zong leaves are conveyed forward, the thickness of the zong leaves stack becomes lower and lower. Usually, after the stacked zong leaves pass through the process section of the limiting component 3, a part of the zong leaves will be conveyed piece by piece, and a part of the zong leaves will still have the phenomenon of overlapping leaves, such as 3 to 6 zong leaves stacked together. Thereafter, the zong leaves continue to be conveyed to the process section of the leveling and leaf separation component. Under the action of a plurality of leveling and leaf separation rollers, the zong leaves conveyed piece by piece are pressed and held by the leveling and leaf separation rollers to become more flat, and the stacked zong leaves are also gradually separated. In this way, most of the zong leaves will be conveyed piece by piece after passing through the process section of the leveling and leaf separation component, but there will still be a phenomenon of 2 zong leaves overlapping each other. Thereafter, , the leaves continue to be transported forward through the process section of the leaf stacking suction component 22. Since the thickness of the leaves after stacking is greater than that of normal leaves, the leaves on the uppermost layer can be extracted from the conveying surface by the leaf stacking suction component 22, and then placed on the unloaded conveying surface, thereby further reducing the probability of overlapping leaves on the conveyor belt; thereafter, the leaves transported piece by piece pass through the leaf rejection control module 5, the bad leaf rejection component 8, and the bad leaf conveying component 9, which cooperate with each other to reject the unqualified leaves transported; then, the leaves continue to be transported forward to the second conveyor belt 10, and through the cooperation of the leaf size detection device 18, the leaf distribution device 19, the leaf grading control module 17 and the second conveyor belt 10, the leaves of three different grades can be transported through the median conveying surface 15 and the two side conveying surfaces 16 respectively to achieve the purpose of grading.

Claims

1. A rice dumpling leaf screening and grading system, comprising a first conveyor belt and a feeding hopper arranged at the feeding end of the first conveyor belt, characterized in that: It also includes a limit assembly, a plurality of leveling and leaf separation assemblies, a zongzi leaf removal control module, a leaf surface camera device, a roller conveyor belt connected to the discharge end of the first conveyor belt, a defective zongzi leaf removal assembly, a defective zongzi leaf conveying assembly, a second conveyor belt connected to the discharge end of the roller conveyor belt, and a zongzi leaf grading assembly. The limiting assembly includes a plurality of baffle separation plates uniformly arranged in sequence along the conveying direction of the rice dumplings; A plurality of the leveling and leafing assemblies are uniformly arranged in sequence above the first conveyor belt along the conveying direction of the rice dumplings, and the leveling and leafing assemblies include a leveling and leafing roller, which rotates in an anti-parallel manner relative to the conveying surface of the first conveyor belt, and the rotational linear speed of the leveling and leafing roller is 0.7 to 0.9 times the conveying speed of the first conveyor belt; The distances between the bottom edges of the plurality of baffle separation plates and the conveying surface of the first conveyor belt and the distances between the lowest rotating sections of the leveling and leaf separation rollers of the plurality of leveling and leaf separation assemblies and the conveying surface of the first conveyor belt decrease in sequence along the conveying direction of the rice dumplings; The leaf surface camera device is arranged at the discharge end of the first conveyor belt to collect leaf surface image data of the zongzi leaves conveyed on the first conveyor belt, and send the leaf surface image data to the zongzi leaves rejection control module; The rice dumpling leaf rejection control module is used to receive the real-time leaf surface image data sent by the leaf surface camera device to identify and judge whether the appearance of the rice dumpling leaf is qualified. If the appearance of the rice dumpling leaf is unqualified, a rejection instruction is issued to the bad rice dumpling leaf rejection component to reject the unqualified rice dumpling leaf; The bad rice dumpling leaf rejection component includes an air nozzle group, which is arranged between the rollers of the roller conveyor belt, and its jet end face is slightly lower than the conveying surface of the roller conveyor belt or flush with the conveying surface of the roller conveyor belt. The air nozzle group is used to receive the rejection instruction sent by the rice dumpling leaf rejection control module and spray high-speed airflow from the bottom to the conveying surface of the roller conveyor belt to blow the rice dumpling leaves transported on the roller conveyor belt away to above the conveying surface; The bad rice dumpling leaf conveying assembly is used to collect and convey the bad rice dumpling leaves blown off and rejected from the roller conveyor belt; The second conveyor belt comprises a middle conveying surface connected to the discharge end of the roller conveyor belt, and two side conveying surfaces arranged on both sides of the middle conveying surface, and the conveying surface widths of the middle conveying surface and the two side conveying surfaces are not less than the width of the conveying surface of the roller conveyor belt; The rice leaf grading component includes a rice leaf grading control module, a leaf size detection device and a leaf distribution device arranged in sequence along the conveying direction of the second conveyor belt; the leaf size detection device is used to detect the length or width of the rice leaves conveyed on the median conveying surface to obtain the length or width data of the rice leaves; the rice leaf grading control module is used to issue instructions according to the length or width data to control the blade distribution device to distribute the rice leaves to different conveying surfaces of the second conveyor belt.

2. The rice dumpling leaf screening and grading system as claimed in claim 1, characterized in that: The outer ring sleeve of the leveling and leaf-separating roller is fixedly provided with a buffer ring sleeve.

3. The rice dumpling leaf screening and grading system as claimed in claim 1, characterized in that: Also included is a stacked leaf suction assembly; The leaf stacking suction assembly is arranged between the leaf leveling roller at the very end and the leaf surface camera device, and the leaf stacking suction assembly includes a leaf stacking suction control module, a suction disc arranged 3 to 5 mm higher than the conveying surface of the first conveyor belt, and a front leaf stacking thickness sensor and a rear leaf stacking thickness sensor arranged adjacent to the front and rear ends of the suction disc in the direction of the rice dumplings; the front leaf stacking thickness sensor and the rear leaf stacking thickness sensor are used to respectively collect the front thickness data of the rice dumplings at the front position and the rear thickness data of the rice dumplings at the rear position on the conveying surface of the first conveyor belt just below the suction disc, and send the front thickness data and the rear thickness data to the leaf stacking suction control module; the leaf stacking suction control module is used to receive and analyze the front thickness data and the rear thickness data, and when the front thickness data and the rear thickness data both exceed the set threshold value, a suction command is issued to the suction disc to extract the upper layer of rice dumplings stacked on the conveying surface of the first conveyor belt from the conveying surface, and then the suction is stopped in time to lower the extracted rice dumplings to the unloaded conveying surface of the first conveyor belt.

4. The rice dumpling leaf screening and grading system as claimed in claim 1, characterized in that: The defective rice dumpling leaf conveying assembly includes an upper conveyor belt and a lower conveyor belt, and the upper conveyor belt and the lower conveyor belt are both inclined along the conveying direction of the roller conveyor belt. The lower conveyor belt includes a lower feeding conveying section and a lower discharging conveying section. The lower feeding conveying section is arranged at an angle with the upper conveyor belt to form an inverted V-shaped rice dumpling leaf feeding port, and the rice dumpling leaf feeding port is located directly above the air nozzle group, and the lower discharging conveying section is arranged parallel to the discharging end of the upper conveyor belt.

5. The rice dumpling leaf screening and grading system as claimed in claim 1, characterized in that: The blade distribution device includes a distribution bracket arranged across the second conveyor belt, a walking trolley that can move on the distribution bracket along the width direction of the conveying surface of the second conveyor belt, and two distribution rods connected to the bottom of the walking trolley and arranged on the conveying surface of the second conveyor belt; the distance between the two distribution rods is the same as the width of the conveying surface of the roller conveyor belt; the rice leaf grading control module is used to issue instructions according to length or width data to control the walking trolley to move horizontally on the distribution bracket, thereby driving the distribution rods to distribute the rice leaves to different conveying surfaces of the second conveyor belt.

6. The rice dumpling leaf screening and grading system as claimed in claim 5, characterized in that: The ends of the two distribution rods that are in contact with the conveying surface of the second conveyor belt are provided with brushes.

7. The rice dumpling leaf screening and grading system as claimed in claim 1, characterized in that: The limiting assembly includes three baffle plates evenly arranged in sequence along the conveying direction of the rice dumplings, and the distances between the bottom edges of the three baffle plates and the conveying surface of the first conveyor belt are 20-30 mm, 15-20 mm, and 8-12 mm respectively along the conveying direction of the rice dumplings.

8. The rice dumpling leaf screening and grading system as claimed in claim 1, characterized in that: The number of the leveling and leaf-separating components is five, and the distances between the lowest rotating cross-sections of the leveling and leaf-separating rollers of the five leveling and leaf-separating components and the conveying surface of the first conveyor belt are 6-8 mm, 4-6 mm, 3-4 mm, 2-3 mm, and 1-2 mm respectively along the conveying direction of the rice dumplings.

9. The rice dumpling leaf screening and grading system as claimed in claim 1, characterized in that: The discharging end of the defective rice dumpling leaf conveying assembly is provided with a defective rice dumpling leaf conveying belt connected thereto.

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