CN-122009589-A - Ton bag re-weighing device and control method thereof

CN122009589ACN 122009589 ACN122009589 ACN 122009589ACN-122009589-A

Abstract

The invention discloses a ton bag re-weighing device and a control method thereof, and relates to the technical field of ton bag weighing and precision calibration. The device comprises a conveying line unit, an independent re-weighing unit, a precise material supplementing and sucking unit, a control system and an anti-interference unit, wherein the conveying line unit is used for continuously conveying ton bags, the independent re-weighing unit comprises a re-weighing conveying section and a weighing sensor group, the re-weighing conveying section is flexibly connected with a main conveying line, a damping support structure is arranged at the bottom of the re-weighing conveying section, the weighing sensor group is in multi-sensor redundant layout and is rigidly connected with the re-weighing conveying section, the precise material supplementing and sucking unit comprises a feeding pipe and a negative pressure material sucking pipe which are arranged in parallel and are independently controlled, the feeding pipe and the negative pressure material sucking pipe are integrally arranged on the same mounting seat, precise material adding and negative pressure material excessive material sucking are respectively achieved, and the control system is based on a PID closed-loop control mode and combines weighing data to adjust material supplementing and sucking actions in real time, so that weighing precision is guaranteed.

Inventors

WEI BINGSHENG
SHI SHUXIA
YE CHANGQING
JIANG TAO
ZHENG YUFENG

Assignees

广州恒尔电子设备有限公司

Dates

Publication Date: 20260512
Application Date: 20260316

Claims (10)

1.A ton bag re-weighing apparatus comprising: A main conveying line; the independent re-weighing unit is arranged at the downstream of the main conveying line and is used for bearing and weighing ton bags; the independent re-weighing unit comprises a re-weighing conveying section, a weighing sensor group arranged below the re-weighing conveying section and a supporting base; The inlet end of the re-weighing conveying section is connected with the outlet end of the main conveying line through a flexible connecting piece, and the flexible connecting piece is configured to block vibration of the main conveying line from being transmitted to the re-weighing conveying section; The bidirectional accurate calibration assembly is arranged above the re-weighing conveying section and comprises a feeding mechanism and a material pumping mechanism which are arranged in parallel; The control system is respectively and electrically connected with the weighing sensor group, the feeding mechanism and the material pumping mechanism; the control system selectively starts the feeding mechanism or the material pumping mechanism according to feedback signals of the weighing sensor group so as to correct the weight of the ton bag, and the feeding mechanism and the material pumping mechanism are in an interlocking state, so that simultaneous operation is avoided.
2. The ton bag weighing apparatus of claim 1, wherein: the flexible connecting piece is an elastic rubber plate; And a composite damping supporting component is further arranged between the composite weighing conveying section and the supporting base, and is formed by alternately superposing a plurality of rubber cushion layers and metal mesh layers.
3. The ton bag weighing apparatus of claim 2, wherein: the weighing sensor group comprises at least four weighing sensors which are symmetrically distributed, and an active temperature compensation component is attached to the shell of each weighing sensor; The active temperature compensation component comprises a heating plate and a temperature sensor, the temperature sensor is used for monitoring the working temperature of the weighing sensor, and the control system controls the starting and stopping of the heating plate according to the monitored temperature to maintain the working environment of the weighing sensor in a preset temperature interval.
4. The ton bag weighing apparatus of claim 1, wherein: the feeding mechanism comprises a feeding pipe and a variable-pitch spiral feeder arranged in the feeding pipe, wherein the pitch of the variable-pitch spiral feeder gradually decreases along the discharging direction and is used for realizing micro linear feeding; The material sucking mechanism comprises a negative pressure material sucking pipe and a horn-shaped material sucking port arranged at the material feeding end of the negative pressure material sucking pipe, and the caliber of the horn-shaped material sucking port gradually contracts along the material sucking direction.
5. The ton bag weighing apparatus of claim 4, wherein: the feeding mechanism and the material drawing mechanism are jointly fixed on a mounting seat, and the mounting seat is connected to the frame through a lifting driving piece, so that the feeding mechanism and the material drawing mechanism can synchronously lift to adapt to ton bags with different heights.
6. The ton bag weighing apparatus according to any one of claims 1-5, wherein: the device comprises a weighing conveying section, a limiting guide mechanism and a weighing device, wherein the weighing conveying section is used for weighing bags, the weighing conveying section is provided with a weighing conveying section, and the weighing conveying section is provided with a weighing device; The control system comprises a material characteristic self-adapting module, wherein the module is configured to calculate the bulk density of the material in real time according to historical weighing data, and dynamically adjust the operation parameters of the feeding mechanism and the pumping mechanism and the threshold value of a control algorithm according to the bulk density.
7. A method of controlling a ton bag weighing apparatus as claimed in any one of claims 1 to 6, comprising the steps of: S1, enabling ton bags to enter an independent re-weighing unit along with a main conveying line, controlling a re-weighing conveying section to decelerate to a preset low speed by a control system, stopping, and simultaneously starting a limiting guide mechanism to center and position the ton bags; Step S2, starting an active temperature compensation assembly, monitoring the temperature of a weighing sensor group, adjusting the temperature to a preset working temperature interval, and obtaining an initial weight value W 0 of the ton bag after the temperature is stable; Step S3, comparing the initial weight value W 0 with the target weight value W target , and calculating a weight deviation Δw=w target - W 0 ; s4, judging whether the absolute value of the weight deviation delta W exceeds an allowable error range; if |ΔW| is within the allowable error range, executing step S7; if delta W is more than 0, locking the material pumping mechanism, and starting the material feeding mechanism to execute material feeding operation; if delta W is less than 0, locking the feeding mechanism, and starting the material pumping mechanism to perform material pumping operation; s5, monitoring the current weight value in real time in the feeding or extracting process, switching to a fine adjustment mode when the residual deviation value enters a micro correction threshold value, and adjusting the running speed of an executing mechanism by adopting a fuzzy-PID cooperative control algorithm; step S6, repeating the steps S3 to S5 until the weight deviation delta W enters an allowable error range, and stopping the feeding mechanism or the drawing mechanism; and S7, recording final weight data, releasing limit, controlling the speed of the re-weighing conveying section and outputting the ton bags to the next process.
8. The control method according to claim 7, characterized in that: In step S5, the specific process of the fuzzy-PID cooperative control algorithm is as follows: collecting the current weight deviation e and the change rate ec thereof as the input of a fuzzy controller; setting a proportional coefficient Kp, an integral coefficient Ki and a differential coefficient Kd of the PID controller on line through a fuzzy rule base; and calculating the motor rotating speed of the executing mechanism by using the set PID parameters, and realizing the trace weight correction without overshoot.
9. The control method according to claim 8, characterized in that: before step S4, the method further includes a material characteristic adaptation step: the system calculates real-time stacking density rho real according to weighing data of the front N ton bags of the current batch; If the deviation between ρ real and the standard bulk density ρ std exceeds the preset ratio, the rough adjustment stage speed parameter and the micro correction threshold of the fed or pumped material are automatically updated to adapt to the flow characteristics of the current material.
10. The control method according to claim 7, characterized in that: In the step S1, the preset low speed is 0.5-1m/min, in the step S2, the preset working temperature interval is 15-30 ℃, and in the step S5, the micro correction threshold is 100g; the interlocking logic in step S4 includes: When the feeding mechanism is detected to be running, the power supply of the material pumping mechanism is forcibly cut off, and the pneumatic valve of the material pumping mechanism is closed; when the material sucking mechanism is detected to be running, the power supply of the feeding mechanism is forcibly cut off, and the discharging valve of the feeding mechanism is closed; only after both stop and a new weight deviation command is received, the other mechanism is allowed to start.

Description

Ton bag re-weighing device and control method thereof Technical Field The application relates to the technical field of automatic ton bag packaging, in particular to a ton bag re-weighing device and a control method thereof. Background In industrial production, ton bags are used as the main packaging form of bulk materials, and the accuracy of the packaging weight is directly related to the quality of products, the production cost, trade settlement and industry compliance. If the weight deviation is too large, not only material waste or claim of clients can be caused, but also product stagnation can be caused due to the fact that the product does not meet the industry standard, so that the weighing of the ton bags is important, and the weight accuracy is ensured. At present, the existing ton bag weighing device mainly adopts a single weighing sensor to carry out static weighing, and has the technical defects that firstly, a weighing conveying section and a main conveying line are integrally arranged, vibration and start-stop impact of the main conveying line can be directly transmitted to the weighing sensor, so that weighing data are fluctuated, high-precision weighing is difficult to realize, secondly, most devices only have a weighing function and do not have an automatic feeding or material pumping function, when the weight of a ton bag deviates, feeding or discharging is needed manually, the efficiency is low, new weight errors are easily introduced by manual operation, the large-scale automatic production requirement cannot be met, thirdly, few devices with the feeding and material pumping functions are installed in a separated mode, the switching operation is complicated, the control precision of feeding and material pumping quantity is low, high-precision calibration is difficult to realize, fourthly, the conventional devices do not carry out systematic optimization aiming at various interference factors in the weighing process, electromagnetic interference, environmental vibration, material impact and the like, the weighing precision is reduced, and the high-precision weighing requirement of the ton bag cannot be met. The utility model provides a ton bag transfer chain of weighing of prior art, includes conveying frame, weighing sensor and conveyer belt, and weighing sensor installs in the bottom of conveying frame for weigh the ton bag on the conveyer belt. The device is realized ton bag's online weighing, but does not set up independent repeated weighing conveying section, and the vibration of main transfer chain can seriously influence the precision of weighing, and does not possess automatic feed supplement and take out the material function, can't carry out accurate calibration to weight deviation. Therefore, the production efficiency is low, and the requirement of high-precision bagging is difficult to meet. The utility model provides a ton bag automatic weighing feed supplement system of prior art, includes weighing platform, feed supplement mechanism and control system, and feed supplement mechanism realizes weight calibration through the feed supplement pipe to the interior feed supplement of ton bag. The system adopts a static weighing platform, continuous conveying and dynamic re-weighing of the ton bags cannot be realized, a material drawing mechanism is not arranged, accurate material drawing cannot be performed when the weight of the ton bags is overweight, meanwhile, the control precision of the material supplementing pipe is low, the influence of various interference factors is not considered, the degree of automation is not high, the production efficiency is low, and the high-precision requirement cannot be met. Disclosure of Invention Accordingly, an object of the present application is to provide a ton bag weighing apparatus and a control method thereof, which have the advantages of high automation degree and high precision bagging. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: In one aspect of the invention, a ton bag re-weighing device is provided, which comprises a conveying line unit, an independent re-weighing unit, an accurate material supplementing and extracting unit, a control system and an anti-interference unit, wherein the units work cooperatively to realize dynamic re-weighing, accurate material supplementing and extracting and high-precision weight control of ton bags. Further, the conveying line unit comprises a main conveying line, a transition conveying section and a conveying driving assembly, wherein the main conveying line is used for realizing continuous conveying of ton bags, the transition conveying section is arranged between the main conveying line and an independent re-weighing unit, two ends of the transition conveying section are connected with the main conveying line and the independent re-weighing unit through flexible connecting pieces, the flexible connecting pieces are made of elastic rubber ma