A blanking and weighing device and method for powder material packaging

Abstract

The present invention discloses a feeding and weighing device and method for powder material bagging. The device includes: a feeding module for receiving raw materials and discharging the materials to be bagged; a clamping and lifting module for clamping the bag to be bagged and sleeving it outside the discharge pipe and lifting and lowering along the discharge pipe; a weighing module for weighing the weight of the bag to be bagged. The target weight of the bag to be bagged during the next bagging is equal to the sum of the product specification weight and the correction value. The correction value is the difference obtained by subtracting the real-time weighing weight when the bag clamping mechanism releases the bag after the weighing is completed when the previous bag to be bagged is fed. Through the cooperation of the feeding module, the clamping and lifting module and the weighing module, the present invention can realize on-line automatic deviation correction during the bagging and feeding process, that is, correct the error on-line according to the production fluctuation situation, reduce or even eliminate the need for reweighing during the bagging production process, reduce the over-tolerance rate of bagging, and reduce the frequency of reweighing during the production process.

Description

Technical Field

[0001] The present invention relates to the technical field of powder machinery, and particularly relates to a blanking weighing device and a weighing method for powder material packaging. Background Art

[0002] During the application of powder raw materials (such as cathode materials for batteries), it is usually necessary to further disperse, weigh, and package them through a packaging machine.

[0003] However, for existing powder material packaging machines, there is a need for manual frequent re-weighing of the packaged products and frequent out-of-tolerance situations, which require manual supplementary feeding, resulting in an increased frequency of supplementary feeding. The proportion of manual supplementary feeding in the entire packaging process also increases, greatly reducing the production capacity of the packaging machine. At the same time, the risk of foreign matter introduction caused by frequent manual supplementary feeding also increases. Summary of the Invention

[0004] The purpose of the present invention is to provide a blanking weighing device and a method for powder material packaging, mainly to solve the problems of frequent re-weighing, frequent out-of-tolerance, and easy introduction of foreign matter due to frequent manual supplementary feeding.

[0005] To achieve the above purpose, the present invention first discloses a blanking weighing device for powder material packaging, which is characterized in that it includes:

[0006] A blanking module for receiving raw materials and discharging the materials to be packaged; the blanking module includes a hopper with a blanking screw inside and a discharge pipe installed at the output port of the hopper, and a valve is installed between the hopper and the discharge pipe;

[0007] A clamping and lifting module for clamping a packaging bag and sleeving it outside the discharge pipe and lifting and lowering along the discharge pipe; the clamping and lifting module includes a telescopic driving member and a bag clamping mechanism installed at the telescopic end of the telescopic driving member;

[0008] A weighing module for weighing the weight of the packaging bag; the weighing module includes a pallet scale installed at the telescopic end of the telescopic driving member, and the pallet scale is located below the bag clamping mechanism;

[0009] When the next packaging bag is blanked through the blanking module, the target weight of the packaging bag is equal to the sum of the product specification weight and the correction value. The correction value is the difference obtained by subtracting the real-time weighing weight when the bag clamping mechanism releases the packaging bag from the real-time weighing weight when the bag clamping mechanism clamps the packaging bag and finishes blanking when the previous packaging bag is blanked through the blanking module.

[0010] Further, the bag clamping mechanism is a bag clamping cylinder, and the bag clamping cylinder is controlled to clamp by a foot pedal.

[0011] Furthermore, the telescopic driving member includes a lifting shaft, the pallet scale is installed at the lower end of the lifting shaft, the bag clamping cylinder is installed at the upper end of the lifting shaft, and a pallet upper limit and a pallet lower limit are provided on one side of the lifting shaft.

[0012] Furthermore, a stirring device for stirring the powder entering the feeding module and a material level detection mechanism for detecting the height of the powder material in the feeding module are installed on the top of the feeding module.

[0013] Furthermore, it also includes a repeat scale for checking the weight of the packaged bags after weighing, and the measurement range, measurement accuracy and brand of the pallet scale and the repeat scale are the same.

[0014] Then, the present invention discloses a method for weighing powder material packaging, which uses any of the above-mentioned weighing devices for powder material packaging, and comprises the following steps:

[0015] S1, control the bag clamping mechanism to clamp the bag, and perform weighing and peeling;

[0016] S2, after weighing and peeling, the telescopic drive member is controlled to drive the tray scale to rise to the upper limit position, and the discharge pipe is inserted into the bottom of the bag;

[0017] S3, control the valve and the feeding screw to feed the material, and the bag clamping mechanism clamps the bag and gradually descends to the lower limit position;

[0018] S4. When the weighing module determines that the real-time weighing weight is not less than the target weight, the material unloading is completed and the real-time weighing weight at this time is recorded; wherein the target weight is equal to the sum of the product specification weight and the correction value;

[0019] S5. After unloading is completed, open the bag clamping cylinder and record the real-time weighing weight at this time as the net weight of the product. Subtract the net weight of the product from the product specification weight as the deviation to determine whether the deviation is less than the allowable error.

[0020] Further, in step S4, the confirmation of the correction value includes the following steps:

[0021] S41, when the last bag is unloaded, the weighing module determines that the real-time weighing weight is not less than the target weight, that is, when the unloading is completed, the real-time weighing weight at this time is recorded; after the bag clamping mechanism is opened, the real-time weighing weight at this time is recorded, and the real-time weighing weight before the bag clamping mechanism is opened is subtracted from the real-time weighing weight after the bag clamping mechanism is opened to obtain the deviation;

[0022] S42. When discharging materials into the next packaging bag, use the deviation described in step S21 as the correction value, and the target weight of the packaging bag is equal to the sum of the product specification weight and the correction value. Among them, when producing the first packaging bag for discharging materials, the running initialization default correction value is 0. After that, when discharging materials into each packaging bag, use the deviation of the previous packaging bag as the correction value to correct the target weight of the current packaging bag.

[0023] Further, in step S3, the following steps are included:

[0024] S31. Open the valve and enter the rapid feeding stage, controlling the feeding screw to feed rapidly. When feeding, the pallet scale slowly descends to the lower limit setting according to the increasing weight.

[0025] S32. After the pallet scale descends to the lower limit position, determine whether the real-time weighing weight is greater than the medium feeding setting value. If it is greater than the medium feeding setting value, enter the medium-speed feeding stage and control the feeding screw to feed at medium speed.

[0026] S33. After starting the medium-speed feeding, determine whether the real-time weighing weight is greater than the slow feeding setting value. If it is greater than the fine feeding setting value, intermittently close the valve and the feeding screw and enter the low-speed feeding stage.

[0027] Further, step S33 includes:

[0028] S331. After entering the low-speed feeding stage, open the valve and control the feeding screw to supplement materials at low speed. When the opening time of the supplementing material is greater than the set value of the supplementing material opening, close the valve and the feeding screw.

[0029] S332. At the same time, record the real-time weighing weight. If it is less than the target weight, return to step S331 for cycling until it is determined that the real-time weighing weight is not less than the target weight, then the material discharging is completed.

[0030] Further, each time the pallet scale makes a weighing record, ensure that the stability difference is less than the stability limit value. The stability deviation is the absolute value obtained by subtracting the stability difference from the stability limit value. The stability difference is the absolute value obtained by subtracting the instantaneous weighing value of the previous interval period from the current real-time weighing weight. The stability limit value is set according to the allowable error accuracy of the product.

[0031] Compared with the prior art, the advantages of the present invention are:

[0032] Through the cooperation of the blanking module, the clamping and lifting module, and the weighing module, the present invention can achieve on-line automatic deviation correction during the bagging and blanking process, that is, correct the error on-line according to the production fluctuation situation, reduce or even eliminate the need for reweighing actions during the bagging production process, reduce the over-tolerance rate of bagging, and reduce the frequency of reweighing during the production process. At the same time, the device responds quickly to production fluctuations and has good tracking ability for rapid changes in fluctuations. Further, it reduces the frequency of manual supplementary feeding, reduces the proportion of manual supplementary feeding in the entire packaging process, improves the accuracy of bagging and blanking, reduces the time for small-batch blanking, and also reduces the risk of foreign object introduction.

[0033] The following will refer to the accompanying drawings to further elaborate on the present invention in detail. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0035] Figure 1 is a schematic structural diagram of a blanking and weighing device for powder material bagging disclosed in a preferred embodiment of the present invention;

[0036] Figure 2 is a control schematic diagram of a blanking and weighing method for powder material bagging disclosed in a preferred embodiment of the present invention.

[0037] LEGEND DESCRIPTION:

[0038] 1. Blanking module; 11. Blanking screw; 12. Hopper; 13. Discharge pipe; 14. Valve; 15. Stirring device; 16. Material level detection mechanism;

[0039] 2. Clamping and lifting module; 21. Telescopic driving member; 22. Bag clamping mechanism; 23. Upper limit of the tray; 24. Lower limit of the tray;

[0040] 3. Weighing module; 31. Tray scale;

[0041] 4. Foot pedal;

[0042] 5. Reweighing;

[0043] 6. Control module; 61. Host computer;

[0044] 7. Frame. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0045] The following will elaborate on the embodiments of the present invention in detail with reference to the accompanying drawings. However, the present invention can be implemented in many different ways defined and covered by the claims.

[0046] As Figure 1-2As shown in the figure, an embodiment of the present invention first discloses a feeding and weighing device for powder material bagging, which includes a plurality of modules installed on a frame 7, where:

[0047] A feeding module 1 for receiving raw materials and discharging the materials to be bagged; the feeding module 1 includes a hopper 12 with a feeding screw 11 arranged inside and a discharge pipe 13 installed at the output port of the hopper 12. The feeding screw 11 is driven by a frequency converter to feed downward in a spiral manner. The top of the hopper 12 is provided with a feeding port, and a valve 14 is installed between the hopper 12 and the discharge pipe 13. By opening and closing the valve 14, the hopper 12 discharges materials to the discharge pipe 13. In this embodiment, the valve 14 is a flap cylinder driven by air pressure.

[0048] A clamping and lifting module 2 for clamping the bag to be bagged and sleeving it outside the discharge pipe 13 and lifting and lowering along the discharge pipe 13; the clamping and lifting module 2 includes a telescopic driving member 21 and a bag clamping mechanism 22 installed at the telescopic end of the telescopic driving member 21. The bag clamping mechanism 22 is a bag clamping cylinder, and the bag clamping cylinder is controlled by a foot pedal 4 for clamping (releasing the bag to be bagged is controlled by a host computer 61); before bagging, the inner packaging bag of the bag to be bagged is manually hung on the bag clamping mechanism 22 and placed on a tray scale 31. The foot pedal 4 is stepped on, and the bag clamping cylinder clamps the bag to be bagged. Then, it is driven to rise by the telescopic driving member 21, and the discharge pipe 13 is inserted into the bottom of the bag to be bagged. Then, the feeding module 1 feeds materials. During the feeding process, the bag to be bagged slowly drops synchronously. Thus, the discharge port of the discharge pipe 13 is always close to the bottom of the bag to be bagged, thereby avoiding the escape of powder.

[0049] A weighing module 3 for weighing the weight of the bag to be bagged; the weighing module 3 includes a tray scale 31 installed at the telescopic end of the telescopic driving member 21, and the tray scale 31 is located below the bag clamping mechanism 22. The telescopic driving member 21 includes a lifting shaft. The tray scale 31 is installed at the lower end of the lifting shaft, and the bag clamping cylinder is installed at the upper end of the lifting shaft. A tray upper limit 23 and a tray lower limit 24 are arranged on one side of the lifting shaft. Specifically, the tray scale 31 includes a tray and a weighing unit, and is connected to the lifting shaft and the flap cylinder to form a whole. The lifting shaft is controlled by a servo motor.

[0050] The target weight W of the bag to be bagged when the next bag to be bagged is fed by the feeding module 1 f1 is equal to the product specification weight W p and the correction value W d0 The sum is, that is, W f1 =W p +W d0 ; where the product specification weight W p is the set weight of the product, that is, the designed weight or the ideal weight, generally a fixed value. The correction value W d0 is the real-time weight W measured when the bag clamping mechanism 22 clamps the bag to be bagged and finishes feeding materials when the previous bag to be bagged is fed by the feeding module 1c0 The real-time weight W after opening the bag clamping mechanism 22 p0 The difference between them, that is, W d0 =W c0 -W p0 ; Thus, the present invention can realize online automatic correction of deviations in the process of packaging and unloading through the cooperation of the unloading module 1, the clamping and lifting module 2 and the weighing module 3, that is, online correction of errors according to production fluctuations, reducing or even eliminating the need for reweighing in the packaging production process, reducing the packaging deviation rate, and reducing the frequency of reweighing in the production process. At the same time, the device responds quickly to production fluctuations and has a good tracking ability for rapid changes in fluctuations. Furthermore, the frequency of manual supplementation of materials is reduced, the proportion of manual supplementation of materials in the entire packaging process is reduced, the accuracy of packaging and unloading is improved, the time for unloading small packages is reduced, and the risk of foreign matter introduction is reduced.

[0051] In this embodiment, a stirring device 15 for stirring the powder entering the feeding module 1 and a material level detection mechanism 16 for detecting the height of the powder material in the feeding module 1 are also installed on the top of the feeding module 1, wherein the stirring device 15 is a stirring blade driven by stirring electricity; the material level detection mechanism 16 can adopt a conventional distance measuring sensor.

[0052] In this embodiment, in order to verify the weight of the product and make the net weight of the product on repeated weighings consistent, a repeat scale 5 is also included for checking the weight of the bag after weighing. The measurement range, measurement accuracy and brand of the pallet scale 31 and the repeat scale 5 are the same, so as to minimize interference factors in the verification.

[0053] Then, the present invention discloses a method for weighing powder material packaging, which uses a weighing device for weighing powder material packaging according to an embodiment of the present invention, and includes the following steps:

[0054] S1. Control the bag clamping mechanism 22 to clamp the bag and determine the stability deviation, that is, whether the stability difference is less than the stability limit. If it is less than the stability limit, weighing and tare are performed, otherwise an alarm is issued to wait for manual processing.

[0055] S2. After weighing and peeling, determine the stability deviation, that is, whether the real-time weighing weight is less than the stability limit. If it is less than the stability limit, control the telescopic drive member 21 to drive the tray scale 31 to rise to the upper limit position, and insert the discharge pipe 13 into the bottom of the packaging bag; if it is greater than or equal to the stability limit, an alarm prompts to wait for manual processing.

[0056] S3. Control the valve 14 to open and the feeding screw 11 to rotate for feeding. The bag clamping mechanism 22 clamps the packaging bag and gradually descends until the lower limit position. Among them, when the bagging machine is running, the stirring device 15 and the upstream feeding motor start and stop synchronously with the feeding screw 11. However, when the level detection mechanism 16 detects a high level signal, the upstream feeding motor stops feeding.

[0057] S4. When the weighing module 3 determines that the real-time weighing weight W c0 is not less than the target weight W f1 , the feeding is completed, and the real-time weighing weight W at this time is recorded c0 ; in this step, since it is determined that the real-time weighing weight W c0 usually has a deviation from the net weight of the product before and after the bag is clamped by the bag clamping cylinder, and the deviation shows non-linearity. There are many reasons for this. Excluding human factors, it mainly comes from the impact caused by the feeding of the upstream feeding motor, the inconsistent positions of manually hanging the inner packaging bag on the bag clamping cylinder and placing it on the pallet scale, the error of the weighing instrument, etc. Therefore, this step proposes a method for online automatically obtaining the correction value to correct the deviation of the bag clamping from the net weight of the product.

[0058] Among them, the target weight W f1 is equal to the sum of the product specification weight W p and the correction value W d0 . The confirmation of the correction value includes the following steps:

[0059] S41. When the previous packaging bag is being fed, when the weighing module determines that the real-time weighing weight is not less than the target weight, that is, when the feeding is completed, record the real-time weighing weight W at this time c0 ; record the real-time weighing weight W at this time after opening the bag clamping mechanism p0 , and subtract the real-time weighing weight W c0 before opening the bag clamping mechanism from the real-time weighing weight W p0 after opening the bag clamping mechanism to obtain the deviation W d0 .

[0060] S42. When the next packaging bag is being fed, use the deviation in step S21 as the correction value. The target weight W of this packaging bag f1 is equal to the sum of the product specification weight W p and the correction value W d0 ; among them, when the first packaging bag is being fed and produced, the running initialization default correction value is 0. After that, when each packaging bag is being fed, take the deviation of the previous packaging bag as the correction value to correct the target weight of the current packaging bag.

[0061] S5. After the blanking is completed, open the bag clamping cylinder, record the real-time weighing weight at this time as the net weight of the product, subtract the net weight of the product from the specified weight of the product as the tolerance, and determine whether the tolerance is less than the allowable error. If it is less than the allowable error and greater than or equal to 0, it is judged as qualified; if it is greater than the allowable error, it is judged as out of tolerance and an alarm is given.

[0062] In this embodiment, before each batch of production, the pallet scale 31 and the re-weighing scale 5 are calibrated so that the net weight of the final product is within the allowable error range.

[0063] In this embodiment, in step S3, the following steps are included:

[0064] S31. Open the valve 14 to enter the rapid feeding stage, and control the blanking screw 11 to feed rapidly; when feeding, the pallet scale 31 slowly descends to the lower limit setting according to the increase in weight;

[0065] S32. After the pallet scale 31 descends to the lower limit position, determine whether the real-time weighing weight W c0 is greater than the medium feeding setting value. If it is greater than the medium feeding setting value, enter the medium-speed feeding stage and control the blanking screw 11 to feed at medium speed.

[0066] S33. After starting the medium-speed feeding, determine whether the real-time weighing weight W c0 is greater than the slow feeding setting value. If it is greater than the fine feeding setting value, intermittently close the valve 14 and the blanking screw 11 to enter the low-speed feeding stage.

[0067] Further, step S33 includes:

[0068] S331. After entering the low-speed feeding stage, open the valve 14 and control the blanking screw 11 to feed at low speed for replenishment. When the replenishment opening time is greater than the replenishment opening set value, close the valve 14 and the blanking screw 11.

[0069] S332. At the same time, record the real-time weighing weight. If it is less than the target weight, return to step S331 for circulation until it is determined that the real-time weighing weight W c0 is not less than the target weight W f1 , then the blanking is completed.

[0070] Further, each time the pallet scale 31 records a weighing, ensure that the stability difference W d is less than the stability limit W L , and the stability deviation W d is the absolute value obtained by subtracting the stability difference W e from the stability limit W L , that is, W d =|W e –W L |; the stability difference W eTo obtain the instantaneous weighing value W of the previous interval period T t0 and the current real-time weighing weight W t1 subtract them and take the absolute value, that is, W e = |W t0 - W t1 |; The stability limit value W L is set according to the allowable error precision of the product. Among them, the interval period T and the stability limit value W L can be set on the host computer 61 of the control module 6.

[0071] Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make many possible changes and modifications to the technical solution of the present invention by using the above-disclosed technical content, or modify it into an equivalent embodiment with equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the technical solution of the present invention shall fall within the scope of protection of the technical solution of the present invention.

Claims

1. A blanking and weighing device for powder material packaging, characterized in that, include: A material discharge module is used to receive raw materials and discharge the materials to be packaged; the material discharge module includes a hopper with a material discharge screw disposed therein and a discharge pipe installed at the output port of the hopper, and a valve is installed between the hopper and the discharge pipe; A clamping and lifting module is used to clamp the bag sleeve outside the discharge pipe and lift it along the discharge pipe; the clamping and lifting module includes a telescopic driving member and a bag clamping mechanism installed at the telescopic end of the telescopic driving member; A weighing module, used for weighing the weight of the bag; the weighing module comprises a pallet scale installed at the telescopic end of the telescopic drive member, and the pallet scale is located below the bag clamping mechanism; The target weight of the next bag when it is unloaded through the unloading module is equal to the sum of the product specification weight and the correction value. The correction value is the difference between the real-time weight when the bag clamping mechanism clamps the bag when the previous bag is unloaded through the unloading module and the real-time weight after the bag clamping mechanism is opened.

2. The blanking and weighing device for powder material packing according to claim 1, wherein The bag clamping mechanism is a bag clamping cylinder, and the bag clamping cylinder is clamped by a foot pedal.

3. The blanking and weighing device for powder material packing according to claim 2, characterized in that, The telescopic driving member comprises a lifting shaft, the pallet scale is mounted on the lower end of the lifting shaft, the bag clamping cylinder is mounted on the upper end of the lifting shaft, and a pallet upper limit and a pallet lower limit are arranged on one side of the lifting shaft.

4. The blanking and weighing device for powder material packaging according to claim 1, wherein, A stirring device for stirring the powder entering the feeding module and a material level detection mechanism for detecting the height of the powder material in the feeding module are also installed on the top of the feeding module.

5. The blanking and weighing device for powder material packing according to claim 1, characterized in that, It also includes a repeating scale for checking the weight of the packed bags after weighing, and the measuring range, measuring accuracy and brand of the pallet scale and the repeating scale are the same.

6. A blanking and weighing method for powder material packaging, characterized in that, The unloading weighing device for powder material packaging according to any one of claims 1 to 5 comprises the following steps: S1, control the bag clamping mechanism to clamp the bag, and perform weighing and peeling; S2, after weighing and peeling, the telescopic drive member is controlled to drive the tray scale to rise to the upper limit position, and the discharge pipe is inserted into the bottom of the bag; S3, control the valve and the feeding screw to feed the material, and the bag clamping mechanism clamps the bag and gradually descends to the lower limit position; S4. When the weighing module determines that the real-time weighing weight is not less than the target weight, the material unloading is completed and the real-time weighing weight at this time is recorded; wherein the target weight is equal to the sum of the product specification weight and the correction value; S5. After unloading is completed, open the bag clamping cylinder and record the real-time weighing weight at this time as the net weight of the product. Subtract the net weight of the product from the product specification weight as the deviation to determine whether the deviation is less than the allowable error.

7. The blanking and weighing method for powder material packaging according to claim 6, characterized in that In step S4, the confirmation of the correction value includes the following steps: S41, when the last bag is unloaded, the weighing module determines that the real-time weighing weight is not less than the target weight, that is, when the unloading is completed, the real-time weighing weight at this time is recorded; after the bag clamping mechanism is opened, the real-time weighing weight at this time is recorded, and the real-time weighing weight after the bag clamping mechanism is opened is subtracted from the real-time weighing weight before the bag clamping mechanism is opened to obtain the deviation; S42. When discharging materials into the next packaging bag, use the deviation described in step S41 as the correction value, and the target weight of the packaging bag is equal to the sum of the product specification weight and the correction value. Among them, when discharging materials for the production of the first packaging bag, the running initialization default correction value is 0. After that, when discharging materials into each packaging bag, take the deviation of the previous packaging bag as the correction value to correct the target weight of the current packaging bag.

8. The blanking and weighing method for powder material packaging according to claim 6, characterized in that In step S3, the following steps are included: S31. Open the valve and enter the rapid feeding stage, controlling the feeding screw to feed rapidly. When feeding, the pallet scale slowly descends to the lower limit setting according to the weight increase. S32. After the pallet scale descends to the lower limit position, determine whether the real-time weighing weight is greater than the medium feeding setting value. If it is greater than the medium feeding setting value, enter the medium-speed feeding stage and control the feeding screw to feed at medium speed. S33. After starting the medium-speed feeding, determine whether the real-time weighing weight is greater than the slow feeding setting value. If it is greater than the fine feeding setting value, intermittently close the valve and the feeding screw and enter the low-speed feeding stage.

9. The blanking and weighing method for powder material packaging according to claim 8, characterized in that, Step S33 includes: S331. After entering the low-speed feeding stage, open the valve and control the feeding screw to replenish materials at low speed. When the replenishing opening time is greater than the replenishing opening set value, close the valve and the feeding screw. S332. At the same time, record the real-time weighing weight. If it is less than the target weight, return to step S331 to loop until it is determined that the real-time weighing weight is not less than the target weight, then the material discharging is completed.

10. The blanking and weighing method for powder material packaging according to any one of claims 6-8, characterized in that When recording each weighing of the pallet scale, ensure that the stability deviation is less than the stability limit value. The stability deviation is the absolute value obtained by subtracting the stability difference from the stability limit value. The stability difference is the absolute value obtained by subtracting the instantaneous weighing value of the previous interval period from the current real-time weighing weight. The stability limit value is set according to the product allowable error accuracy.

Images