Multi-stage weighing device for rice processing
By employing two independent weighing systems and a staggered conveyor shaft design in the rice processing equipment, the problems of equipment vibration and space occupation are solved, achieving efficient dual weighing and accurate diversion, and meeting the requirements of metrological supervision.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- YINGKOU BOHAI RICE IND CO LTD
- Filing Date
- 2026-06-01
- Publication Date
- 2026-07-14
AI Technical Summary
Existing rice processing equipment suffers from mechanical impact and vibration during the weighing process due to the diversion mechanism, resulting in excessively long equipment length, large space occupation, and inability to effectively handle defective products detected by the second weighing re-inspection. This also leads to low integration, increased equipment costs, and more potential points of failure.
Two independent weighing systems are used, and each bag of finished product is weighed twice independently. The non-conforming products are diverted by the height switching of the cross-arranged conveyor shaft and the feeding shaft. The diversion function is integrated into the re-inspection conveyor belt. The feeding shaft is raised and lowered by a worm gear transmission mechanism and a synchronous telescopic rod to avoid vibration interference and excessive equipment length.
This achieves a compact equipment structure, reduces unplanned downtime, ensures weighing accuracy and diversion accuracy, avoids misjudgment by a single scale and equipment failure, and meets the metrological supervision requirements for prepackaged foods.
Smart Images
Figure CN224486833U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of grain processing metering equipment, specifically a multi-stage weighing device for rice processing. Background Technology
[0002] In the field of rice processing and grain packaging measurement, in order to ensure that the net content of each bag of finished product meets the requirements of metrological regulations, it is usually necessary to regularly calibrate the weighing equipment or use a double-scale verification method to improve the accuracy of the test. Currently common dual-weighing verification equipment typically consists of a first weighing scale, a diversion mechanism, and a second weighing scale arranged sequentially along the conveyor line. When the first weighing scale determines a product is unqualified, the diversion mechanism activates and rejects the product; qualified products then proceed to the second weighing scale for secondary verification. However, this type of equipment has revealed the following shortcomings in practical applications: Firstly, to avoid affecting weighing accuracy, the diversion mechanism is usually placed between two weighing scales, and is mostly a flip-plate or push-plate structure. When such a mechanism operates, it will generate mechanical impact and vibration. In order to prevent the vibration from being transmitted to the weighing sensor, a long buffer distance must be reserved between the two weighing scales, resulting in a large overall length of equipment, occupying a lot of factory space, and making it difficult to lay out in existing production lines with limited space.
[0003] Secondly, the diversion mechanism can only reject products based on the results of the first weighing scale and cannot handle non-conforming products found by the second weighing scale during re-inspection. If the second weighing scale determines that a product is non-conforming, there is often a lack of corresponding diversion channels or an additional independent rejection device is required. The integration is not high, which increases equipment costs and potential failure points. Utility Model Content
[0004] To address the shortcomings of existing technologies, this utility model provides a multi-stage weighing device for rice processing. It solves the problems of existing devices generating mechanical shocks and vibrations during operation, requiring a long buffer distance between the two weighing scales to prevent vibration transmission to the weighing sensors. This results in an excessively long overall device length, occupying significant factory space and making it difficult to implement in existing production lines with limited space. Furthermore, the diversion mechanism can only reject products based on the results of the first weighing scale, failing to handle non-conforming products detected by the second weighing scale. If the second weighing scale determines a product is non-conforming, there is often a lack of corresponding diversion channels or the need for an additional independent rejection device, leading to low integration and increased equipment costs and potential failure points.
[0005] To achieve the above objectives, this utility model provides the following technical solution: A multi-stage weighing device for rice processing, characterized in that it comprises: A workbench is provided with a feeding conveyor belt, a weighing system, a re-inspection system and a discharging conveyor belt placed sequentially along its length. The feeding end of the weighing system is equipped with a pusher, and a rework conveyor belt is fixedly installed above the discharging conveyor belt. The weighing system includes a feeding weighing platform on which a weighing conveyor belt is fixedly installed, and the feeding port of the weighing conveyor belt corresponds to the feeding conveyor belt. The re-inspection system includes a re-inspection weighing platform, on which a re-inspection conveyor belt is fixedly installed, and a separation conveyor belt is slidably connected inside the re-inspection conveyor belt along the height direction.
[0006] Preferably, when the separating conveyor belt slides to its maximum value, its inlet and outlet correspond to the pusher and the rework conveyor belt, respectively; when the separating conveyor belt slides to its minimum value, its inlet and outlet correspond to the weighing conveyor belt and the discharge conveyor belt, respectively.
[0007] Preferably, the re-inspection conveyor belt includes a rotating shaft positioning frame. The bottom of the rotating shaft positioning frame is rotatably connected to a drive shaft and several driven shafts along the length direction. A corresponding conveyor shaft is provided above the drive shaft and the driven shafts. The drive shaft, the driven shafts, and the conveyor shafts are connected by a transmission. When the drive shaft rotates, it drives the conveyor shafts to rotate through the driven shafts.
[0008] Preferably, a motor mounting bracket is provided between the driven shaft and the conveying shaft. The connecting ends of the motor mounting bracket are fixedly connected to the side wall and bottom wall of the rotating shaft positioning bracket, respectively. A drive motor is fixedly installed inside the motor mounting bracket. A worm gear is fixedly installed at the drive end of the drive motor. A worm wheel that meshes with the worm gear is fixedly installed on the drive shaft.
[0009] Preferably, the separating conveyor belt includes two rotating shaft positioning plates, and a plurality of feeding shafts are rotatably connected between the two rotating shaft positioning plates. The plurality of feeding shafts are arranged intersectingly with the plurality of conveying shafts. A plurality of guide grooves are opened along the height on both sides of the rotating shaft positioning frame between the conveying shafts. A plurality of guide blocks that slide and adapt to the guide grooves are fixedly installed on the inner wall of the rotating shaft positioning plate below the feeding shafts. Synchronous telescopic rods are fixedly installed on the outer walls of the two rotating shaft positioning plates.
[0010] Preferably, when the synchronous telescopic rod is retracted to its original position, the feeding shaft and the conveying shaft are at the same height and both correspond to the discharge conveyor belt. When the synchronous telescopic rod is raised to the working position, the feeding shaft is at the same height as the pusher and the rework conveyor belt.
[0011] This utility model provides a multi-stage weighing device for rice processing, which has the following beneficial effects: This invention employs two completely independent weighing systems. Regardless of whether the product is qualified or not, each bag of finished rice undergoes two independent weighing tests. If the deviation between the two weighing data exceeds a preset threshold, the measuring equipment can be immediately identified as malfunctioning, the entire line will be shut down and an alarm will be triggered, thus preventing the outflow of batches of unqualified products caused by the continuous operation of faulty scales. At the same time, it avoids the loss caused by the rework of qualified products due to misjudgment by a single scale, eliminates the need for regular manual shutdown for calibration, significantly reduces unplanned downtime, and fully meets the metrological supervision requirements for pre-packaged food.
[0012] This invention integrates the defective product diversion function into the re-inspection conveyor belt. By switching the height of the cross-arranged conveyor shaft and the feeding shaft, the station conversion between the discharge of qualified products and the diversion of defective products is realized. No additional independent diversion mechanism is required. The overall structure of the equipment is compact and saves space. At the same time, the weighing and diversion actions are completely separated. The action of the diversion mechanism will not cause any vibration interference to the weighing process. It also solves the problems of "double scale verification requires a large distance" and "limited workshop space requires compact equipment".
[0013] This utility model uses a synchronous telescopic rod to drive the entire feeding shaft to rise and fall synchronously, resulting in high precision in station switching. Station switching and diversion actions are only performed after the second weighing is completed and the product is confirmed to be unqualified, thus avoiding the bag jamming, leakage, and bag flushing problems of conventional flip-plate diversion. It adopts a worm gear transmission mechanism with a self-locking function, so there will be no slippage or stoppage during the conveying process.
[0014] This invention can achieve time-sharing static weighing through a control unit. When the feeding weighing platform is weighing, the re-inspection conveyor belt is locked; when the re-inspection weighing platform is weighing, the weighing conveyor belt is locked, thus eliminating the dynamic impact and vibration crosstalk of the bag onto the scale. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the overall structure in a stowed state (qualified product conveying station) in an embodiment of this utility model; Figure 2 This is a schematic diagram of the overall structure in the unfolded state (non-conforming product sorting station) in an embodiment of this utility model; Figure 3 This is a cross-sectional schematic diagram of the overall structure in the unfolded state in an embodiment of this utility model; Figure 4 This is a cross-sectional view of the rotating shaft positioning frame in an embodiment of the present invention.
[0016] In the diagram: 1. Workbench; 2. Feed conveyor belt; 3. Discharge conveyor belt; 4. Pusher; 5. Rework conveyor belt; 6. Feed weighing platform; 7. Re-inspection weighing platform; 8. Rotary shaft positioning frame; 9. Drive shaft; 10. Driven shaft; 11. Conveyor shaft; 12. Motor mounting frame; 13. Drive motor; 14. Worm gear; 15. Worm wheel; 16. Rotary shaft positioning plate; 17. Feeding shaft; 18. Guide groove; 19. Guide block; 20. Synchronous telescopic rod; 21. Weighing conveyor belt. Detailed Implementation
[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.
[0018] A multi-stage weighing device for rice processing includes: Workbench 1 has a feeding conveyor belt 2, a weighing system, a re-inspection system and a discharging conveyor belt 3 placed sequentially along its length. The feeding end of the weighing system (between the feeding conveyor belt 2 and the weighing conveyor belt 21) is equipped with a pusher 4 (the pusher 4 adopts a pneumatic push rod structure). A rework conveyor belt 5 is fixedly installed above the discharging conveyor belt 3 (the feeding end of the rework conveyor belt 5 corresponds to the pushing direction of the pusher 4, and the discharging end is connected to the non-conforming product rework area). The weighing system includes a feeding weighing platform 6 (the feeding weighing platform 6 is fixed to the workbench 1 by bolts, and has four sets of cantilever weighing sensors arranged symmetrically at the four corners inside), and a weighing conveyor belt 21 is fixedly installed on it, with the feed inlet of the weighing conveyor belt corresponding to the feeding conveyor belt 2. The re-inspection system includes a re-inspection weighing platform 7 (the re-inspection weighing platform 7 is fixed to the workbench 1 by bolts, and a buffer gap is reserved between it and the feeding weighing platform 6. They are not rigidly connected to each other to isolate vibration transmission. The re-inspection weighing platform 7 also has four sets of independent cantilever weighing sensors built inside, which are completely independent of the sensor group of the feeding weighing platform 6 and do not interfere with each other). A re-inspection conveyor belt is fixedly installed on it. A separation conveyor belt is slidably connected inside the re-inspection conveyor belt along the height direction. The conversion between the two workstations is realized by switching the height of the separation conveyor belt.
[0019] When the separating conveyor belt slides to its maximum value, its inlet and outlet correspond to the pusher 4 and the rework conveyor belt 5, respectively. When the separating conveyor belt slides to its minimum value, its inlet and outlet correspond to the weighing conveyor belt 21 and the discharge conveyor belt 3, respectively.
[0020] The re-inspection conveyor belt includes a rotating shaft positioning frame 8. The bottom of the rotating shaft positioning frame 8 is rotatably connected to a drive shaft 9 and several driven shafts 10 along the length direction. A corresponding conveyor shaft 11 is provided above the drive shaft 9 and the driven shafts 10. The drive shaft 9, the driven shafts 10 and the conveyor shafts 11 are connected by transmission. When the drive shaft 9 rotates, it drives the conveyor shafts 11 to rotate through the driven shafts 10.
[0021] In use, the re-inspection conveyor belt includes an upward-facing U-shaped rotating shaft positioning frame 8. The bottom of the rotating shaft positioning frame 8 is fixedly connected to the top surface of the re-inspection weighing platform 7 by bolts. A drive shaft 9 is rotatably connected between the left and right side walls of the rotating shaft positioning frame 8. Several driven shafts 10 are rotatably connected at equal intervals along the length direction on the side of the drive shaft 9. The ends of the drive shaft 9 and all driven shafts 10 are fixed with sprockets, and they are synchronously transmitted to each other through a transmission chain. A corresponding conveyor shaft 11 is set directly above the drive shaft 9 and each driven shaft 10. The two ends of the conveyor shaft 11 are rotatably connected to the two side walls of the rotating shaft positioning frame 8. The ends of the drive shaft 9 and the corresponding conveyor shaft 11, and the ends of the driven shaft 10 and the corresponding conveyor shaft 11 are all connected to the drive shaft 9 and the corresponding conveyor shaft 11 through synchronous pulleys and synchronous belts. When the drive shaft 9 rotates, it can synchronously drive all the conveyor shafts 11 to rotate in the same direction through the driven shafts 10, forming a horizontal conveying surface for qualified products.
[0022] A motor mounting bracket 12 is provided between the driven shaft 10 and the conveying shaft 11. The connecting ends of the motor mounting bracket 12 are fixedly connected to the side wall and bottom wall of the rotating shaft positioning bracket 8, respectively. A drive motor 13 is fixedly installed inside the motor mounting bracket 12. A worm gear 14 is fixedly installed at the drive end of the drive motor 13. A worm wheel 15 that meshes with the worm gear 14 is fixedly installed on the drive shaft 9.
[0023] In use, an L-shaped motor mounting bracket 12 is installed inside the rotating shaft positioning frame 8, between the driven shaft 10 and the conveying shaft 11. The vertical end of the motor mounting bracket 12 is fixedly connected to the right side wall of the rotating shaft positioning frame 8 by bolts, and the horizontal end is fixedly connected to the inner bottom wall of the rotating shaft positioning frame 8 by bolts. A drive motor 13 is fixedly installed inside the motor mounting bracket 12. The drive motor 13 is a geared servo motor, and a worm gear 14 is fixedly installed at its output end. The right end of the drive shaft 9 extends into the motor mounting bracket 12, and a worm wheel 15 is fixedly installed at its end. The worm wheel 15 meshes with the worm gear 14 to realize the deceleration transmission of the drive shaft 9 through the worm gear mechanism. It also has a self-locking function to avoid the problems of stopping or slipping during the conveying process.
[0024] The separating conveyor belt includes two rotating shaft positioning plates 16, and several feeding shafts 17 are rotatably connected between the two rotating shaft positioning plates 16. The feeding shafts 17 and several conveying shafts 11 are arranged crosswise. Several guide grooves 18 are opened along the height on both sides of the rotating shaft positioning frame 8 between the conveying shafts 11. Several guide blocks 19 that slide and adapt to the guide grooves 18 are fixedly installed on the inner wall of the rotating shaft positioning plate 16 below the feeding shafts 17. Synchronous telescopic rods 20 are fixedly installed on the outer wall of the two rotating shaft positioning plates 16.
[0025] In use, the synchronous telescopic rod 20 adopts a servo electric cylinder. Its fixed end is fixedly connected to the bottom of the side wall of the rotating shaft positioning frame 8, and its telescopic end is fixedly connected to the bottom of the rotating shaft positioning plate 16. Through the synchronous extension and retraction of the two synchronous telescopic rods 20, the two rotating shaft positioning plates 16 are driven to slide up and down synchronously along the guide groove 18, thereby realizing the overall height switching of all feeding shafts 17.
[0026] When the synchronous telescopic rod 20 retracts to its original position, the feeding shaft 17 and the conveying shaft 11 are at the same height and correspond to the discharge conveyor belt 3. When the synchronous telescopic rod 20 is raised to the working position, the feeding shaft 17 is at the same height as the pusher 4 and the rework conveyor belt 5.
[0027] When in use, when the synchronous telescopic rod 20 is fully retracted to the initial working position, the top surfaces of all feeding shafts 17 and the top surfaces of all conveying shafts 11 are on the same horizontal plane, forming a continuous horizontal conveying surface. The left end of this conveying surface corresponds to the discharge port of the weighing conveyor belt 21, and the right end corresponds to the inlet of the discharge conveyor belt 3, which is used for the normal discharge of qualified products. When the synchronous telescopic rod 20 is fully extended to the working position, the top surfaces of all feeding shafts 17 are higher than the top surfaces of the conveying shafts 11, forming an independent diversion conveying surface. The left end of this conveying surface corresponds to the pushing end of the pusher 4, and the right end corresponds to the inlet of the rework conveyor belt 5, which is used for the diversion conveying of unqualified products.
[0028] In this embodiment, the weighing sensor groups of the feeding weighing platform 6 and the re-inspection weighing platform 7, the solenoid valve of the pusher 4, the servo controller of the synchronous telescopic rod 20, and the driver of the drive motor 13 are all electrically connected to the PLC control unit of the equipment. The control unit has built-in weight comparison algorithm, station control logic and fault alarm module, which can realize fully automated operation.
[0029] The specific workflow of this embodiment is as follows: Initial standby state: Synchronous telescopic rod 20 is in the initial retracted position, feeding shaft 17 and conveying shaft 11 are on the same horizontal plane, forming a continuous qualified conveying surface, drive motor 13 is in standby, and pusher 4 is in the retracted original position.
[0030] First weighing test: The pre-packaged finished rice that has been sealed is smoothly fed into the weighing conveyor belt 21 via the feeding conveyor belt 2. After the control unit detects that the bag has completely entered the effective weighing area of the weighing conveyor belt 21 through the photoelectric sensor, the weighing conveyor belt 21 is locked and stopped. The feeding weighing platform 6 completes the first static weight acquisition and transmits the weight data to the control unit to lock the weight benchmark value of the bag of product.
[0031] Product conveying and secondary weighing verification: Regardless of whether the first weighing value is within the acceptable threshold range, the control unit starts the weighing conveyor belt 21 and the drive motor 13 to smoothly send the bag of product onto the conveying surface of the re-inspection conveyor belt (the horizontal conveying surface composed of the conveying shaft 11 and the feeding shaft 17); after the photoelectric sensor detects that the bag has 100% completely entered the effective weighing area of the re-inspection conveyor belt, the drive motor 13 is locked and stopped, the re-inspection weighing platform 7 completes the second static weight acquisition, and transmits the weight data to the control unit.
[0032] Dual-scale data comparison and equipment status determination: The control unit compares the weight data of the feeding weighing platform 6 and the re-inspection weighing platform 7 in real time. If the deviation between the two weight data exceeds the preset fault threshold, it immediately determines that the feeding weighing platform 6 or the re-inspection weighing platform 7 has a metering drift or sensor damage, and immediately triggers the entire line to stop and lock. At the same time, it triggers the light and sound alarm device to prompt the staff to perform equipment calibration and troubleshooting. The equipment can only resume operation after the fault is eliminated and the equipment is manually unlocked, thus preventing batch accidents and misjudgments caused by the continuous operation of faulty equipment.
[0033] If the deviation between the two weight data is within the preset allowable range, it is determined that the two weighing devices are measuring normally. The consistency of the two weighing results is used as the benchmark to determine whether the product is qualified.
[0034] Qualified products are shipped normally: If the product weight is within the acceptable threshold range of the nominal weight, the control unit determines that it is a qualified product, restarts the drive motor 13, and transports the product to the discharge conveyor belt 3 through the conveyor shaft 11 and the feeding shaft 17 to complete the normal shipment.
[0035] Precise diversion of substandard products: If the product weight exceeds the acceptable threshold range of the nominal weight, the control unit determines it to be a non-conforming product and immediately activates the two synchronous telescopic rods 20, driving the rotating shaft positioning plate 16 and all feeding shafts 17 to rise synchronously to the working position. The feeding shafts 17 lift the non-conforming product as a whole to a height level with the pusher 4 and the rework conveyor belt 5. Then, the pusher 4 is activated, and the pusher plate smoothly pushes the non-conforming product on the feeding shaft 17 to the rework conveyor belt 5, and finally sends it to the rework area for processing. After the diversion is completed, the synchronous telescopic rods 20 retract and reset, and the equipment returns to standby mode, ready for the inspection of the next bag of products.
[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A multi-stage weighing device for rice processing, characterized in that, include: The workbench (1) has a feeding conveyor belt (2), a weighing system, a re-inspection system and a discharge conveyor belt (3) placed on it along its length. The feeding end of the weighing system is equipped with a pusher (4), and a rework conveyor belt (5) is fixedly installed above the discharge conveyor belt (3). The weighing system includes a feeding weighing platform (6), on which a weighing conveyor belt (21) is fixedly installed, and the feed inlet of the weighing conveyor belt (21) corresponds to the feeding conveyor belt (2); The re-inspection system includes a re-inspection weighing platform (7), on which a re-inspection conveyor belt is fixedly installed, and a separation conveyor belt is slidably connected inside the re-inspection conveyor belt along the height direction.
2. The multi-stage weighing equipment for rice processing according to claim 1, characterized in that, When the separating conveyor belt slides to its maximum value, its inlet and outlet correspond to the pusher (4) and the rework conveyor belt (5) respectively. When the separating conveyor belt slides to its minimum value, its inlet and outlet correspond to the weighing conveyor belt and the discharge conveyor belt (3) respectively.
3. The multi-stage weighing equipment for rice processing according to claim 1, characterized in that, The re-inspection conveyor belt includes a rotating shaft positioning frame (8). The bottom of the rotating shaft positioning frame (8) is rotatably connected to a drive shaft (9) and several driven shafts (10) along the length direction. A corresponding conveyor shaft (11) is provided above the drive shaft (9) and the driven shafts (10). The drive shaft (9), the driven shafts (10), and the conveyor shafts (11) are connected by transmission. When the drive shaft (9) rotates, it drives the conveyor shafts (11) to rotate through the driven shafts (10).
4. The multi-stage weighing equipment for rice processing according to claim 3, characterized in that, A motor mounting bracket (12) is provided between the driven shaft (10) and the conveying shaft (11). The connecting end of the motor mounting bracket (12) is fixedly connected to the side wall and bottom wall of the rotating shaft positioning bracket (8) respectively. A drive motor (13) is fixedly installed inside the motor mounting bracket (12). A worm gear (14) is fixedly installed at the drive end of the drive motor (13). A worm wheel (15) that meshes with the worm gear (14) is fixedly installed on the drive shaft (9).
5. A multi-stage weighing device for rice processing according to claim 3, characterized in that, The separating conveyor belt includes two rotating shaft positioning plates (16), and several feeding shafts (17) are rotatably connected between the two rotating shaft positioning plates (16). The several feeding shafts (17) and several conveying shafts (11) are arranged crosswise. Several guide grooves (18) are opened along the height on both sides of the rotating shaft positioning frame (8) between the conveying shafts (11). Several guide blocks (19) that slide and adapt to the guide grooves (18) are fixedly installed on the inner wall of the rotating shaft positioning plate (16) below the feeding shafts (17). Synchronous telescopic rods (20) are fixedly installed on the outer walls of the two rotating shaft positioning plates (16).
6. A multi-stage weighing device for rice processing according to claim 5, characterized in that, When the synchronous telescopic rod (20) retracts to its original position, the feeding shaft (17) and the conveying shaft (11) are at the same height and correspond to the discharge conveyor belt (3). When the synchronous telescopic rod (20) is raised to the working position, the feeding shaft (17) is at the same height as the pusher (4) and the rework conveyor belt (5).