An online intelligent weighing and grading system

Abstract

An online intelligent weighing and grading system includes a weighing unit, a grading unit, a transmission unit, and a control unit. The weighing unit is located upstream of the transmission unit and connected to a counter at its rear. The grading unit is located downstream of the transmission unit. After the material is weighed at the front end, the control unit automatically grades the material at the rear end using the grading unit. By controlling the connection method of the weighing unit and its contact method with the material, the material is not subjected to vertical tension from the connecting arm and the rotating arm when passing through the horizontal track. This ensures that the vertical direction of the horizontal track is only affected by the weight of the material, ensuring accurate measurement results from the weighing sensor, and automatically grading the material according to the weight set by the control unit.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent weighing and grading, and in particular to an online intelligent weighing and grading system. Background Art

[0002] Many materials need to be accurately weighed and graded for different packaging or different applications. For example, in the food industry where the applicant is located, poultry carcasses and various cuts need to be accurately weighed frequently and then packaged separately. The traditional weighing and grading method is to use several people to weigh manually. Taking poultry carcasses as an example, each person has a scale in front of him, and the materials are hung on the hanger of the assembly line. During the material transmission process, the staff must first judge which poultry carcass weighs more and which weighs less based on experience, and then grab the required materials and put them on the scale for manual weighing. If they meet the standards, they will be kept. If they do not meet the standards, they need to be hung back on the hanger. Continuous trial and error is required, the efficiency is extremely low, and a lot of manpower is used, resulting in high labor costs. Therefore, the applicant has developed an online intelligent weighing and grading system to replace several manual weighings with precise intelligent weighing and automatic grading, achieving better economic benefits. Summary of the Invention

[0003] To solve the above problems, the present invention provides an online intelligent weighing and grading system that replaces several manual weighing steps with precise intelligent weighing and automatic grading.

[0004] The technical solutions of the present invention are as follows:

[0005] An online intelligent weighing and grading system includes a weighing unit, a grading unit, a transmission unit and a control unit. The weighing unit is arranged upstream of the transmission unit, and the grading unit is arranged downstream of the transmission unit. After the front end weighs the material, the grading unit can be used at the back end to automatically grade the material under the action of the control unit.

[0006] Furthermore, the transmission unit is used to convey materials along a predetermined trajectory, and includes several connecting arms, rotating arms, anti-wear rollers and hangers that move along the predetermined trajectory. The rotating arm is rotatably connected to the lower side of the connecting arm, and the other end of the rotating arm is connected to the anti-wear roller. A hanger is hung on the anti-wear roller, and the hanger is used to suspend materials.

[0007] Furthermore, a first fixed frame is provided on the side of the transmission unit for fixing a weighing unit. The weighing unit includes a base, a weighing sensor, a connecting plate, and a horizontal track. The base is fixed to the first fixed frame, on which a weighing sensor is mounted. The weighing sensor is connected to a horizontally arranged horizontal track via a connecting plate. The horizontal track is located below the transmission unit and includes at least two hangers. The hanger passes between the two horizontal tracks. The minimum distance between the two horizontal tracks is less than the length of the anti-wear roller. The length of the horizontal track only allows for a maximum of one hanger to pass through it. The distance between the horizontal track and the lowest point of the connecting arm is designed so that the anti-wear roller will not be subjected to the vertical tension of the rotating arm when passing through the horizontal track. By controlling the connection method of the weighing unit and the contact method with the material, the material will not be subjected to the vertical tension from the connecting arm and the rotating arm when passing through the horizontal track, ensuring that the vertical direction of the horizontal track is only affected by the gravity of the material and ensuring the accuracy of the measurement results of the weighing sensor.

[0008] Furthermore, inclined tracks are provided at intervals upstream and downstream of the horizontal track, and the inclined tracks are connected to the first fixing frame via a connecting plate.

[0009] Preferably, the inclined track is designed at an angle such that the anti-wear rollers can always slide along the upper surface of the inclined track. The inclined track can act as a buffer for materials entering and exiting the horizontal track. Furthermore, a gap is provided between the horizontal track and the inclined track to effectively prevent forces on the inclined track from being transferred to the horizontal track and affecting the measurement results of the weighing sensor.

[0010] Furthermore, the grading unit includes a telescopic cylinder, the lowest point of the extended end of which matches the height dimension of the lowest point of the hanger. A counter is provided behind the weighing sensor for counting the sequence of material weights measured by the current weighing sensor. The weighing sensor and the counter are both connected to a control unit. The control unit can control the action of the telescopic cylinder according to the signal values transmitted by the weighing sensor and the counter, and push the material within the threshold range away from the hanger to complete the grading work.

[0011] In the online intelligent weighing and grading system described above, the connecting plates of the weighing unit include a first connecting plate and a second connecting plate. The first connecting plate is horizontally connected to the weighing sensor, and the second connecting plate is arranged vertically, with its upper end connected to the first connecting plate and its lower end connected to the horizontal track. The weighing sensor can be a common cantilever weighing sensor, one end of which is fixed to the base, avoiding direct connection with the first fixed frame, and the other end extends below the transmission unit through the horizontal first connecting plate and the vertical second connecting plate, thereby suspending the horizontal track. Through multiple avoidance designs, the weight of materials passing through the horizontal track is accurately recorded by the weighing sensor.

[0012] Furthermore, the first connecting plate and the side surface of the horizontal track are both provided with connecting rods for connecting to the second connecting plate.

[0013] As described above, the online intelligent weighing and grading system, the transmission unit includes a transmission track and a transmission chain, the transmission chain is fixedly connected to the connecting arm, the chain lengths between adjacent connecting arms are the same, the upper end of the connecting arm is rotatably connected to a roller, and the roller rolls along the transmission track.

[0014] As described above, in the online intelligent weighing and grading system, one end of the rotating arm is rotatably connected to the connecting arm, and the other end is bifurcated and connected to the anti-wear roller, and the hanger is located between the bifurcated ends of the rotating arm.

[0015] In the online intelligent weighing and grading system described above, the grading unit further includes a lower guide frame and a mounting plate. The lower guide frame extends outward at its front end and is connected to the mounting plate at its rear end, facilitating the movement of materials along the lower guide frame to the mounting plate. The mounting plate is located on one side of the vertical surface of the hanger, with its upper surface aligned with the height dimension of the hanger's lowest point. A telescopic cylinder is mounted on its outward-facing side. Both the lower guide frame and the mounting plate are connected to the second fixed frame via connecting rods.

[0016] Furthermore, the hanger is an annular structure that is wide at the top and narrow at the bottom, with a positioning ring protruding from the hanger ring body at the top, and the lower end is bent 10-45 degrees toward the top.

[0017] Furthermore, the grading unit includes two upper guide frames, arranged opposite each other on either side of the hanger, with their front ends extending outward. The upper guide frames are positioned higher than the positioning rings and are narrower than the positioning rings. The distance between the lower surface of the upper guide frames and the positioning rings is no more than one-third of the positioning ring length. This allows the positioning rings to engage beneath the upper guide frames as the hanger passes over them, ensuring stable transport without shaking and facilitating the telescopic cylinder to push the material upwards out of the hanger.

[0018] Preferably, the ejection end of the telescopic cylinder is connected to a guide rod, the rear end of the guide rod is horizontally connected to the ejection end of the telescopic cylinder, and the front end is tilted downward to prevent the material on the next hanger from affecting the ejection action of the telescopic cylinder.

[0019] The beneficial effects achieved by the present invention compared to the prior art are:

[0020] 1. The present invention provides an online intelligent weighing and grading system. The grading unit is arranged downstream of the transmission unit. After the front end weighs the material, the grading unit can be used at the back end to automatically grade the material under the action of the control unit, saving a lot of manpower and improving workshop efficiency.

[0021] 2. This invention provides an online intelligent weighing and grading system. By controlling the connection method of the weighing unit and its contact with the material, the material passing through the horizontal track is not subjected to vertical tension from the connecting arm and the rotating arm. This ensures that the vertical direction of the horizontal track is only affected by the gravity of the material, ensuring accurate measurement results from the weighing sensor. This type of weighing unit connection method does not exist in the prior art, and this is the applicant's original design.

[0022] 3. The present invention provides an online intelligent weighing and grading system. Through the cooperation of the upper and lower guide frames and the hanger, when the hanger passes through the upper guide frame, the positioning ring can be stuck under the upper guide frame, so that the hanger can be transported stably without shaking, which is conducive to the telescopic cylinder to push the material out of the hanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] By reading the detailed description of the preferred embodiment below, the solutions and advantages of the present application will become clear to those skilled in the art. The accompanying drawings are only for illustrating the preferred embodiment and are not to be considered as limiting the present invention.

[0024] In the attached figure:

[0025] Figure 1 This is a schematic diagram of the overall structure of an online intelligent weighing and grading system in an embodiment;

[0026] Figure 2 Schematic diagram of the structure of the weighing unit in the embodiment;

[0027] Figure 3 A top view of the upper portion of the weighing unit in the embodiment;

[0028] Figure 4 A top view of the position above the lower horizontal track of the weighing unit in the embodiment;

[0029] Figure 5 A top view of the upper guide frame in the embodiment;

[0030] Figure 6 A top view of the lower guide frame in the embodiment;

[0031] Figure 7 Schematic diagram of the structure of the grading system when ejecting a poultry carcass in the embodiment;

[0032] Figure 8 Schematic diagram of the structure of the hanger, where (a) is a front view and (b) is a side view;

[0033] The components represented by the reference numerals in the figure are:

[0034] 1. Weighing unit; 11. Base; 12. Weighing sensor; 13. First connecting plate; 14. Second connecting plate; 15. Horizontal track; 2. Grading unit; 21. Upper guide frame; 22. Lower guide frame; 23. Second fixed frame; 24. Telescopic cylinder; 25. Guide rod; 26. Mounting plate; 3. Transmission unit; 31. Conveyor track; 32. Roller; 33. Connecting arm; 34. Transmission chain; 35. Rotating arm; 36. Anti-wear roller; 37. Hanger; 4. First fixed frame; 5. Third connecting plate; 6. Inclined track; 7. Counter. DETAILED DESCRIPTION

[0035] Example

[0036] See also Figure 1 In this embodiment, an online intelligent weighing and grading system includes a weighing unit 1, a grading unit 2, a transmission unit 3, and a control unit. The weighing unit 1 is located upstream of the transmission unit 3 and is connected to a counter 7 at its rear. The grading unit 2 is located downstream of the transmission unit 3. After the material is weighed at the front end, the grading unit 2 can be used at the rear end to automatically grade the material under the control of the control unit. This embodiment uses the weight grading of poultry carcasses, such as white-striped ducks, as an example. This will be used in the following description to help those skilled in the art better understand the technical solutions of this application.

[0037] The following combination Figure 3 The transmission unit 3 is a separately operated system used to transport the white-striped duck along a predetermined trajectory. The transmission unit 3 includes a conveying track 31 at the top and a transmission chain 34 at the bottom. Connecting arms 33 are connected to the transmission chains 34 at fixed intervals. The upper end of the connecting arm 33 is rotatably connected to a roller 32, which rolls along the conveying track 31. The lower end of the connecting arm 33 is rotatably connected to a rotating arm 35. The other end of the rotating arm 35 is connected to an anti-wear roller 36. A hanger 37 is suspended from the anti-wear roller 36, and the hanger 37 is used to suspend the white-striped duck.

[0038] See also Figure 2 A first fixing frame 4 is provided on the side of the transmission unit 3 . There are two first fixing frames 4 , which are arranged on both sides of the transmission track 31 for fixing the weighing unit 1 .

[0039] See also Figure 1-Figure 3The weighing unit 1 includes a base 11, a weighing sensor 12, a first connecting plate 13, a second connecting plate 14, and a horizontal track 15. The base 11 is fixed above the two first fixing frames 4, and the weighing sensor 12 is mounted in the middle of the base 11. One end of the weighing sensor 12 is connected to the base 11, and the other end is connected to the horizontal first connecting plate 13 above. The first connecting plate 13 has connecting rods on both sides for connecting the two vertically arranged second connecting plates 14. The two second connecting plates 14 extend downward and are connected to the horizontal track 15 below the transmission chain 34. The horizontal track 15 also has connecting rods on the sides.

[0040] Preferably, a vertical sliding hole is provided at the upper end of the second connecting plate 14 and a horizontal sliding hole is provided at the lower end, which are respectively used to ensure the vertical state of the second connecting plate 14 and the horizontal state of the horizontal track 14.

[0041] Furthermore, the horizontal rails 15 comprise two stainless steel tubes to reduce friction and provide waterproofing. The anti-wear rollers 36 are cylindrical rods made of polyoxymethylene plastic. The hanger 37 passes between the two horizontal rails 15. The inner distance between the two horizontal rails 15 is less than the length of the anti-wear rollers 36, allowing the anti-wear rollers 36 to roll over the two horizontal rails 15.

[0042] Preferably, the outer distance between the two horizontal rails 15 is the same as the length of the anti-wear roller 36 to simplify the structure and reduce the influence of external forces on the measurement results.

[0043] Furthermore, the length of the horizontal track 15 can only allow at most one hanger 37 to pass therethrough, so as to ensure that the weighing sensor 12 only measures the white-striped duck hanging on one hanger 37 at a time.

[0044] See also Figure 4 One end of the rotating arm 35 is rotatably connected to the connecting arm 33 , and the other end is bifurcated and connected to the anti-wear roller 36 . The hanger 37 is located between the bifurcated ends of the rotating arm 35 .

[0045] Furthermore, the distance between the horizontal track 15 and the lowest point of the connecting arm 33 is designed so that when the anti-wear roller 36 passes over the horizontal track 15, the rotating arm 35 is in a horizontal rotational state. At this time, the anti-wear roller 36 is not subjected to the vertical tension of the rotating arm 35. In this way, the weighing sensor 12 is connected to the horizontal track 15 via the first connecting plate 13 and the second connecting plate 14. This ensures that when the white-striped duck passes over the horizontal track 15, it is not subjected to the vertical tension from the connecting arm 33 and the rotating arm 35. This ensures that the horizontal track 15 is vertically affected only by the weight of the white-striped duck, ensuring accurate measurement results from the weighing sensor 12.

[0046] In this embodiment, inclined tracks 6 are provided at intervals upstream and downstream of the horizontal track 15 , and the inclined tracks 6 are connected to the first fixing frame 4 via a third connecting plate 5 .

[0047] Furthermore, the third connecting plate 5 is mainly used to fix the inclined track 6. Like the second connecting plate 14, in order to reduce the length of the anti-wear roller 36, it is also arranged between the first fixing frame 4 and the transmission chain 34. Figure 3 The third connecting plate 5 is provided with a connecting piece at its upper end to fix it to the first fixing frame 4 , and a vertical long hole is opened at its lower end to connect with the inclined track 6 .

[0048] Preferably, the angle of inclination of the inclined track 6 is designed so that the anti-wear roller 36 can always slide along the upper surface of the inclined track 6, providing a buffer for the ducks entering and exiting the horizontal track 15. Furthermore, a gap is provided between the horizontal track 15 and the inclined track 6 to effectively prevent forces on the inclined track 6 from being transmitted to the horizontal track 15 and affecting the measurement results of the load cell 12. This is a key inventive feature of this application and represents a significant difference from the prior art.

[0049] In this embodiment, the grading unit 2 includes a telescopic cylinder 24, the lowest point of the extended end of which matches the height dimension of the lowest point of the hanger 37. A counter 7, such as an infrared counter, is provided behind the weighing sensor 12 for counting the sequence of the weight of the white-striped duck measured by the current weighing sensor 12. The weighing sensor 12 and the counter 7 are both connected to a control unit. The control unit has a pre-set picking threshold, and can control the action of the telescopic cylinder 24 according to the signal value transmitted by the weighing sensor 12 and the counter 7. The position of the counter 7 is a fixed distance from the position of the telescopic cylinder 24, and the distance between adjacent hangers 37 is also a fixed value. The transmission speed of the transmission chain 34 can be controlled by the control unit. Therefore, it is not difficult to calculate the weight of the white-striped duck at the measuring point of the weighing sensor 12, and control the telescopic cylinder 24 to push it away from the hanger 37 according to whether the weight falls within the threshold range to complete the grading work, see Figure 7 The telescopic cylinder can be an electric cylinder, which is convenient for workshop environment layout.

[0050] See also Figure 5-Figure 8 The structure of the grading unit 2 is closely related to the structure of the hanger 37. The hanger 37 is a ring-shaped structure that is wide at the top and narrow at the bottom. The head of the duck is suspended on the anti-wear roller 36. The wide upper part allows the duck's head to be easily inserted into the ring, and then the duck's neck is clamped down to the narrow lower part. A transition portion 372 is provided between the wide upper part and the narrow lower part.

[0051] Furthermore, a rectangular positioning ring 371 is provided at the top, perpendicular to the surface of the hanger ring and protruding from the hanger 37. The lower end is bent upward by 10-45 degrees. This angled design prevents the duck head from drooping vertically downward, but rather tilts it slightly upward. This allows the telescopic cylinder to adjust this angle and lift the duck head upward to the transition portion 372, thereby further ejecting the hanger 37 from the upper wide area.

[0052] Furthermore, in view of the special design of the hanger 37, the grading unit 2 of this embodiment includes an upper guide frame 21, a lower guide frame 22, and a mounting plate 26. The lower guide frame 22 is provided with only one, with the front end extending outward and the rear end connected to the mounting plate 26. At the same time, the ducks are placed with their heads facing the lower guide frame 22, so that the lower end of the hanger 37 with the duck heads mounted thereon can slide along the outer side of the lower guide frame 22 to the mounting plate 26. The mounting plate 26 is bent at both ends to enhance its strength. Its opening faces outward and is located entirely on one side of the vertical surface of the hanger 37. Its upper plane matches the height dimension of the lowest point of the hanger 37. The outward side of the mounting plate is equipped with a telescopic cylinder 24. The rear end of the lower guide frame 22 is connected to the ends of the bent edges of the mounting plate 26 to enhance the overall strength of the mounting plate 26. At the same time, the distance between the lower guide frame 22 and the inner side wall of the mounting plate 26 is designed so as not to hinder the upward telescopic movement of the telescopic cylinder 24. The lower guide frame 22 and the mounting plate 26 are both fixed to the second fixing frame 23 on one side of the transmission unit 3 through a connecting rod.

[0053] Preferably, the ejection end of the telescopic cylinder 24 is further connected to a guide rod 25, the rear end of the guide rod 25 is horizontally connected to the ejection end of the telescopic cylinder 24, and the front end is tilted downward to prevent the white duck on the next hanger 37 from affecting the ejection action of the telescopic cylinder 24.

[0054] Furthermore, the upper guide frame 21 includes two upper guide frames 21 , which are fixed to the second fixing frames 23 on both sides of the hanger 37 through connecting rods respectively, and the front end extends outward to guide the hanging ring 37 to enter between the two upper guide frames 21 .

[0055] Furthermore, the upper guide frame 21 is set higher than the positioning ring 371, and its width is smaller than the width of the positioning ring 371. At the same time, the distance between the lower surface of the upper guide frame 21 and the positioning ring 371 is not greater than 1 / 3 of the length of the positioning ring. This is also a major invention of the inventor. Through the coordinated design of the upper guide frame 21, the lower guide frame 22 and the hanger 37, the lower end of the hanger 37 will slide along the outer side of the lower guide frame 22 to the position of the mounting plate 26. Since the upper plane of the mounting plate 26 is at the same height as the lowest point of the hanger 37, the duck neck will stick to the part between the inner wall of the mounting plate 26 and the lower guide frame 22, thereby changing the free swing of the white-striped duck on the hanger 37 into a dragging action along the upper plane of the mounting plate 26, and then causing the lower end of the hanger 37 to tilt forward. Due to the design of the width of the positioning ring 371 and the upper guide frame 21, when the hanger 37 passes through the upper guide frame 21, the positioning ring 371 will be stuck under the upper guide frame 21, so that the hanger 37 will be stably transported when passing through the mounting plate 26 without shaking, thereby facilitating the telescopic cylinder 24 to push the white striped duck out of the hanger 37 upwards, see Figure 7 shown.

[0056] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes, additions, subtractions, or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An online intelligent weighing and grading system, characterized in that: The invention comprises a weighing unit (1), a grading unit (2), a transmission unit (3) and a control unit, wherein the weighing unit (1) is arranged upstream of the transmission unit (3), and the grading unit (2) is arranged downstream of the transmission unit (3); The transmission unit (3) is used to convey materials along a predetermined track, and comprises a plurality of connecting arms (33), a rotating arm (35), an anti-wear roller (36) and a hanger (37) that move along the predetermined track, wherein the rotating arm (35) is rotatably connected to the lower side of the connecting arm (33), the other end of the rotating arm (35) is connected to the anti-wear roller (36), and the hanger (37) is hung on the anti-wear roller (36), and the hanger (37) is used to suspend materials; The transmission unit (3) is provided with a first fixing frame (4) on the side thereof for fixing the weighing unit (1). The weighing unit (1) comprises a base (11), a weighing sensor (12), a connecting plate and a horizontal track (15). The base (11) is fixed on the first fixing frame (4) and is equipped with a weighing sensor (12). The weighing sensor (12) is connected to a horizontal track (15) arranged horizontally via the connecting plate. The horizontal track (15) is located below the transmission unit (3) and comprises at least two tracks. The hanger (37) passes between the two horizontal tracks (15). The minimum distance between the two horizontal tracks (15) is less than the length of the anti-wear roller (36). The length of the horizontal track (15) can only allow at most one hanger (37) to pass therethrough. The distance between the horizontal track (15) and the lowest point of the connecting arm (33) is designed so that the anti-wear roller (36) will not be subjected to the vertical pulling force of the rotating arm (35) when passing through the horizontal track (15). Inclined tracks (6) are provided at intervals upstream and downstream of the horizontal track (15), and the inclined tracks (6) are connected to the first fixing frame (4) via a connecting plate; The grading unit (2) includes a telescopic cylinder (24), the lowest point of the extended end of which matches the height dimension of the lowest point of the hanger (37). A counter (7) is provided behind the weighing sensor (12) for counting the sequence of material weights currently measured by the weighing sensor (12). The weighing sensor (12) and the counter (7) are both connected to a control unit. The control unit can control the movement of the telescopic cylinder (24) according to the signal values transmitted by the weighing sensor (12) and the counter (7), so as to push the material falling within a threshold range away from the hanger (37).

2. An online intelligent weighing and grading system according to claim 1, characterized in that: The connecting plate of the weighing unit (1) comprises a first connecting plate (13) and a second connecting plate (14), wherein the first connecting plate (13) is horizontally connected to the weighing sensor (12), and the second connecting plate (14) is vertically arranged, with its upper end connected to the first connecting plate (13) and its lower end connected to the horizontal track (15).

3. An online intelligent weighing and grading system according to claim 2, characterized in that: The first connecting plate (13) and the horizontal track (15) are both provided with connecting rods on their sides for connecting to the second connecting plate (14).

4. The online intelligent weighing and grading system according to claim 1, characterized in that: The inclination angle of the inclined track (6) is designed so that the anti-wear roller (36) can always slide along the upper surface of the inclined track (6).

5. The online intelligent weighing and grading system according to claim 1, characterized in that: The transmission unit (3) comprises a transmission track (31) and a transmission chain (34). The transmission chain (34) is fixedly connected to a connecting arm (33). The chain lengths between adjacent connecting arms (33) are the same. The upper end of the connecting arm (33) is rotatably connected to a roller (32), and the roller (32) rolls along the transmission track.

6. The online intelligent weighing and grading system according to claim 1, characterized in that: One end of the rotating arm (35) is rotatably connected to the connecting arm (33), and the other end is bifurcated and connected to the anti-wear roller (36). The hanger (37) is located between the bifurcated ends of the rotating arm (35).

7. The online intelligent weighing and grading system according to claim 1, characterized in that: The grading unit (2) further comprises a lower guide frame (22) and a mounting plate (26). The front end of the lower guide frame (22) extends outward, and the rear end is connected to the mounting plate (26). The mounting plate (26) is located on one side of the vertical surface of the hanger (37). The upper plane thereof matches the height dimension of the lowest point of the hanger (37). The outward side thereof is equipped with a telescopic cylinder (24). The lower guide frame (22) and the mounting plate (26) are both connected to the second fixed frame (23) via a connecting rod.

8. An online intelligent weighing and grading system according to claim 7, characterized in that: The hanger (37) is an annular structure that is wide at the top and narrow at the bottom. A positioning ring is provided on the upper part to protrude from the hanger (37) ring body, and the lower end is bent upward by 10-45 degrees.

9. The online intelligent weighing and grading system according to claim 8, characterized in that: The grading unit (2) further comprises an upper guide frame (21), wherein the upper guide frame (21) comprises two upper guide frames, which are arranged on both sides of the hanger (37) relative to each other, with the front ends extending outwards. The upper guide frame (21) is higher than the positioning ring and has a width smaller than the width of the positioning ring. The distance between the lower surface of the upper guide frame (21) and the positioning ring is no greater than 1 / 3 of the length of the positioning ring.

10. An online intelligent weighing and grading system according to any one of claims 7 to 9, characterized in that: The ejection end of the telescopic cylinder (24) is connected to a guide rod (25), the rear end of the guide rod (25) is horizontally connected to the ejection end of the telescopic cylinder (24), and the front end is tilted downward.

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