CN112936813A

CN112936813A - Quick feed proportioning system of accurate measurement

Info

Publication number: CN112936813A
Application number: CN202110092763.3A
Authority: CN
Inventors: 陈新辉; 张奎; 刘新国
Original assignee: Shantou University
Current assignee: Shantou University
Priority date: 2021-01-22
Filing date: 2021-01-22
Publication date: 2021-06-11

Abstract

The invention discloses a rapid batching system with accurate metering, which comprises a batching system, a mixing system and a feeding system, wherein the batching system comprises a plurality of storage bins and a plurality of weighing devices, each weighing device comprises a weighing hopper main body, each weighing hopper main body comprises a first weighing hopper and a second weighing hopper, feed inlets of the first weighing hopper and the second weighing hopper are connected with feed outlets of the storage bins through pipelines, a conveying pipeline is arranged between each weighing device and the mixing system, materials in the hoppers are input into the corresponding first weighing hopper to be weighed and metered, the materials in the first weighing hoppers enter the mixing system through the conveying pipelines to be mixed under the action of a distribution system, and the mixed materials are conveyed to a processing system by the feeding system to be processed. The invention solves the problems of measurement accuracy and batching rapidity in raw material weighing, avoids repeated recovery operation in material conveying, greatly improves material distribution efficiency and meets the centralized feeding requirement of a multi-production line extrusion system.

Description

Quick feed proportioning system of accurate measurement

Technical Field

The invention relates to the field of plastic particle raw material proportioning, in particular to a rapid proportioning system with accurate metering.

Background

At present, China has become a big world for manufacturing plastic products, the total production amount of the plastic products is steadily improved, and the quality of the plastic products tends to be better and better. In order to meet different use requirements and use performances, a plurality of plastic raw materials and additives are required to be mixed according to a certain proportion, and the product produced by mixing can meet the specific use functions and requirements. Particularly for multilayer co-extrusion film blowing equipment, films with different properties need to be extruded and produced according to requirements, and the properties of the produced films can be different greatly according to different raw material formulas. Inaccurate ingredient proportion can not only cause the performance of the material to be not up to the requirement, but also cause the material to lose efficacy, seriously affect the quality of the product and cause a great deal of resource waste. Therefore, ensuring that the output raw materials are produced strictly according to a given formula has important significance for ensuring the quality and the performance of the produced products.

On the other hand, along with the demand of plastic products developing, each producer begins to expand the productivity, increases production facility quantity, and a batching supply apparatus needs to accomplish the batching of many extrusion lines and carries, and original batching system is difficult to adapt to the increase of production facility, and the batching speed of system can not satisfy the batching consumption speed when producing plastic products, and it also becomes one of the more and more concern problem of producer to promote the batching speed of batching system.

The production flow of the plastic film is as follows: 1. determining the types and proportions of the required raw materials according to the performance and requirements of the produced film; 2. determining the quality of the raw material formula required by a single batch according to the product yield and the production efficiency; 3. determining the weight of the feed bin and the output raw material which need to participate in the batch of formula according to the formula proportion; 4. sequentially conveying required raw materials from a stock bin to enter a weighing system for weighing and metering; 5. conveying all weighed materials into a mixer, and uniformly mixing and stirring; 6. and conveying the uniformly mixed materials into a processing equipment hopper for processing production.

As can be seen from the production flow of the plastic film, the weighing and metering of the output of each raw material in the formula have a significant influence on ensuring the accuracy of the formula. In actual production, for solid particle raw materials, due to the characteristic of pneumatic transmission, after a bin valve is closed, in order to prevent pipeline blockage, residual materials in a pipeline are required to be continuously conveyed into a weighing system, so that the actual conveyed mass of each raw material is large, and the output of solid particles is difficult to accurately measure.

In addition, the raw materials of participating in the batching can not be through once only weighing and carry the compounding system fast, need weigh one by one and carry the compounding system, leads to the time greatly increased of cost on the material is carried, has influenced batching speed in the very big degree.

At present, the dosing modes of solid raw materials are mainly divided into two modes according to the automation degree. One is that the raw materials are manually mixed, and for a system with low requirement on the mixing proportion, the raw materials can be manually or mechanically poured into a mixer according to the approximate proportion, and the raw materials are uniformly mixed and then are sent into production equipment. The other type is system automatic batching, the conveying of raw materials is controlled through a PLC system, and the other type also has a plurality of batching forms according to different principle structures. One scheme is a batching system with a recovery device, after a weighing system reaches the required weight, redundant materials in a pipeline are recovered and returned to a raw material bin, so that the metering of solid particle raw materials is realized, but the scheme is complex in system structure and troublesome to control, and meanwhile, a large amount of energy is wasted when the raw materials are recovered. The other scheme is that error compensation is carried out on a weighing system in advance, and the weighing system is not provided with ingredients of a material recovery device. And (4) performing trial-run debugging on the batching system before production to determine the error compensation amount. But even if through the system that compensates the weighing system in advance, also because the raw materials are of a great variety, different raw materials, different pipeline pressure in the system, and mass compensation will also be different between the different pipeline structure, be difficult to form unified compensation standard, need spend a large amount of time to carry out the compensation volume debugging simultaneously, bring very big inconvenience in actual production, batching system material precision also can not better control, be not suitable for to the system that the batching precision required is strict.

Disclosure of Invention

The technical problem to be solved by the embodiments of the present invention is to provide a fast batching system with accurate metering to solve the problems of difficult accurate metering of batching output and overlong batching time in the existing batching system, so that each material in a formula is rapidly mixed according to a given ratio and is conveyed to a processing device.

In order to achieve the aim, the invention discloses a rapid batching system with accurate metering, which comprises a batching system, a mixing system and a feeding system, the batching system comprises a plurality of bins and a plurality of weighing devices, the weighing devices comprise weighing hopper bodies, the weighing hopper main body comprises a first weighing hopper, a first blanking pipeline is arranged between a feed inlet of the first weighing hopper and a feed outlet of the storage bin, a material conveying pipeline is arranged between the weighing device and the material mixing system, the materials in the hoppers are input into the corresponding first weighing hoppers to weigh and measure the materials, the materials in the first weighing hopper enter the material mixing system through the material conveying pipeline under the action of the distribution system to be mixed, so that the mixed materials are conveyed to the processing system by the material conveying system to be processed.

Preferably, the weighing hopper main body further comprises a second weighing hopper, a second discharging pipeline is arranged between a feeding port of the second weighing hopper and a discharging port of the storage bin, materials in the storage bin are input into the second weighing hopper correspondingly, so that the materials are weighed and metered, the materials in the second weighing hopper enter the mixing system through the conveying pipeline under the action of the distribution system to be mixed with various materials, and the mixed materials are conveyed to the processing system by the feeding system to be processed.

Preferably, the feed openings of the storage bin are provided with first gate valves to control the output of the materials in the storage bin, and the feed hopper of the weighing hopper main body is provided with a first material cutting valve to control the output of the materials in the weighing hopper main body.

Preferably, the compounding system includes blendor, middle hopper, the feed inlet of blendor is provided with first vacuum auto sucking machine, the one end of conveying pipeline with the feed inlet fixed connection of first vacuum auto sucking machine, the other end all be provided with defeated material branch pipe between the main part of the fill of weighing, the feed opening of blendor with the feed inlet pipe connection of middle hopper, the feed opening of blendor is provided with the second push-pull valve, makes its control the output of batching in the blendor, the feed opening of middle hopper is provided with the second material intercepting valve, makes its control the output of batching in the middle hopper.

Preferably, the processing system includes a plurality of extruders, all be provided with the feeder hopper on the feed inlet of a plurality of extruders, the feed inlet of feeder hopper all is provided with second vacuum suction machine, the feed opening of middle hopper is connected with the conveying pipeline, the conveying pipeline with all be provided with the pay-off branch pipe between the second vacuum suction machine.

Preferably, the feeding branch pipes are provided with third material intercepting valves.

Preferably, the feeding system comprises a vacuum generator and a pneumatic pipeline, a first air delivery pipeline is arranged between the pneumatic pipeline and the first vacuum suction machine, a second air delivery pipeline is arranged between the first air delivery pipeline and the processing equipment, a first air cutoff valve is arranged on the pneumatic pipeline to control the conveying power of the feeding system, a second air cutoff valve is arranged on the first air delivery pipeline to control the on-off of the first air delivery pipeline, an air delivery branch pipe is arranged between the second air delivery pipeline and an air inlet of the second vacuum suction machine, and a third air cutoff valve is arranged on the air delivery branch pipe.

Preferably, the feeding system further comprises a filtering device, wherein the filtering device comprises a plurality of filters, and the filters are respectively arranged in the feeding ports of the first vacuum suction machine and the second vacuum suction machine and on the air inlet end of the pneumatic pipeline.

Preferably, any two of the storage bins are fixedly connected into a whole, a third discharging pipeline and a second discharging pipeline are respectively arranged between the first weighing hoppers, and a third gate valve and a fourth gate valve are respectively arranged on the third discharging pipeline and the fourth discharging pipeline.

Compared with the prior art, the invention has the beneficial effects that:

compared with the prior art, the accurate metering and batching system based on the weight-increasing type multiple weighing devices can realize accurate metering and quick batching in the raw material distribution process. Through closely installing weighing device in every feed bin below, simple structure, convenient operation, the maintenance volume is little, and is stable in use, has solved the problem of measurement accuracy and batching transport rapidity when the raw materials is weighed. The material conveying device has the advantages that the material conveying device avoids repeated recovery operation in material conveying, reduces energy waste and improves material distribution efficiency. Meanwhile, the compensation amount debugging is not needed, the operation flow and the control process are obviously simplified, the system fault rate is reduced, and the batching accuracy rate is improved. Through the application of middle hopper, promoted blendor availability factor for system's batching speed. Two ingredient storage bins which cannot be used simultaneously or are not frequently used in the formula are arranged above one weighing device, so that the cost is effectively reduced. The invention also introduces a second weighing device, thereby avoiding the shutdown loss when a single weighing device is maintained and further accelerating the production efficiency. The method is particularly suitable for distributing solid raw material particles produced by plastic extrusion.

Drawings

Fig. 1 is a schematic overall structure diagram of a first embodiment of the present invention;

FIG. 2 is a schematic overall structure diagram of a second embodiment of the present invention;

FIG. 3 is a schematic overall structure diagram of a third embodiment of the present invention;

FIG. 4 is a schematic view showing a structure of a portion A in FIG. 1;

FIG. 5 is a schematic view showing a structure of a portion B in FIG. 2;

fig. 6 is a schematic view showing a structure of the C portion in fig. 3.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings of fig. 1 to 6.

The first embodiment is as follows:

referring to fig. 1, a fast batching system with precise metering comprises a batching system 1, a mixing system 2 and a feeding system 3.

Referring to fig. 1 and 4, a batching system 1 includes a plurality of bins 11 and a plurality of weighing devices 12, four sets of

bins

11A, 11B, 11C and 11D are preferably adopted in the invention, the weighing devices are all arranged below a first bin 11A, a second bin, a third bin and a

fourth bin

11A, 11B, 11C and 11D, the weighing devices 12 include weighing hopper bodies, each weighing hopper body includes a first weighing hopper 121, a first blanking pipeline 111 is arranged between a feed port of the first weighing hopper 121 and a blanking port of each of the first bin, the second bin, the third bin and the

fourth bin

11A, 11B, 11C and 11D, a first plug-in board 13 is arranged on each first blanking pipeline 111, the first plug-in board 13 is controlled to control output of materials in the corresponding bin 11 by controlling the state of the corresponding first plug-in valve 13, the invention opens the corresponding first plug-in board according to a raw material formula required by a multilayer coextrusion film blowing process, so that the materials in the corresponding bin fall into the corresponding first weighing hopper 121, the material that gets into is measured through first weighing hopper 121, and when the material reached required weight, first push-pull valve 13 closed thereupon, stops the material input, and the lower hopper of weighing hopper main part 12 is provided with first material cutting valve 123, and through opening corresponding first material cutting valve 123, is provided with conveying pipeline 14 between weighing device 12 and the compounding system 2, makes the material input in the first weighing hopper 121 that corresponds in the compounding system 2, makes it carry out the homogeneous mixing with different materials.

The mixing system 2 comprises a mixer 21 and an intermediate hopper 22, a first vacuum suction machine 23 is arranged at a feed inlet of the mixer 21, one end of a conveying pipeline 14 is fixedly connected with the feed inlet of the first vacuum suction machine 23, a conveying branch pipe 141 is arranged between the other end of the conveying pipeline and a weighing hopper main body, the conveying system 3 is used for controlling materials to be input into the mixer 21 and comprises a vacuum generator 31 and a pneumatic pipeline 32, a first air pipeline 33 is arranged between the pneumatic pipeline 32 and the first vacuum suction machine 23, a first air cutoff valve 321 is arranged on the pneumatic pipeline 32 and used for controlling the conveying power of the conveying system, a second air cutoff valve 331 is arranged on the first air pipeline 33 and used for controlling the negative pressure of the first air pipeline 33 to be turned on and off through the vacuum generator 31 so as to form a vacuum air flow, the vacuum is generated inside the first vacuum suction machine 23, and the corresponding materials in the first weighing hopper enter the mixer 21 under the action of the first vacuum suction machine 23, make it carry out the misce bene with inside different materials through starting blendor 21, the feed inlet pipe connection of feed inlet and middle hopper 22 of blendor 21, the feed inlet of blendor 21 is provided with second push-pull valve 211, and after the material misce bene, second push-pull valve 211 is opened thereupon, makes the material in the blendor 21 wait for the distribution in falling into middle hopper 22 under the dead weight effect.

The processing system 4 comprises a plurality of extruders 41, feed hoppers 42 are arranged on feed inlets of the extruders 41, second vacuum feeders 43 are arranged on feed inlets of the feed hoppers 42, feed pipes 5 are connected to feed outlets of the intermediate hoppers 22, second material intercepting valves 221 are arranged on feed outlets of the intermediate hoppers 22 to control output of ingredients in the intermediate hoppers 22, feed branch pipes 51 are arranged between the feed pipes 5 and the second vacuum feeders 43, third material intercepting valves 52 are arranged on the feed branch pipes 51, second gas conveying pipes 34 are arranged between the first gas conveying pipes 33 and the second vacuum feeders 43, gas conveying branch pipes 341 are arranged between the second gas conveying pipes 34 and gas inlets of the second vacuum feeders 43, third air intercepting valves 342 are arranged on the gas conveying branch pipes 341, and the ingredients in the intermediate hoppers 22 are input into corresponding feed inlets under the action of the corresponding second vacuum feeders 43 by opening the second material intercepting valves 221 and the corresponding third

material intercepting valves

52 and 342 In the hopper 42, the material in the hopper 42 is allowed to fall under its own weight into the extruder 41.

The feed inlets of the first vacuum suction machine 23 and the second vacuum suction machine 43 or the air inlet end of the pneumatic pipeline 32 are all provided with filters, so that sundries in the pipelines are effectively prevented from entering.

The specific implementation sequence of the invention is as follows: when the system receives the batching signal, the feed bin 11 needing to participate in batching and the predicted output raw material weight are determined, the corresponding first inserting plate 13 is opened to enable the plastic particle raw material to enter the first weighing hopper 121 under the action of gravity, and when the material output from the feed bin 11 reaches the predicted output weight, the first inserting plate valve 13 is closed to stop the material conveying.

After all the materials in the batch of the formula are weighed, the corresponding first cut-off valve 123 and the first cut-off valve 321 are opened, the materials in the corresponding first weighing hopper 121 are conveyed into the mixer 21 under the action of the first vacuum suction machine 23, after all the batch of the ingredients in the first weighing hopper 121 enter the mixer 21, the corresponding first cut-off valve 123 and the first cut-off valve 321 are closed, and simultaneously, the mixing operation of the batch of the ingredients conveyed into the mixer 21 is started.

Then, after the material mixing operation of the material mixer 21 is completed, the second gate valve 211 is opened, so that the uniformly mixed material in the material mixer 21 rapidly enters the lower intermediate hopper 22 under the action of gravity, and after all the material in the material mixer 21 is discharged, the second gate valve 211 is closed.

Finally, the second material intercepting valve 221 is opened, the third material intercepting valve 52 on the corresponding feeding branch pipe 51 and the third air intercepting valve 342 are opened, ingredients received by the middle hopper 22 are conveyed into the corresponding extruder 41 through the second vacuum suction machine 43, the ingredients are extruded and molded through the extruder 41, through the application of a plurality of weighing devices, various raw materials participating in ingredients can be weighed and conveyed into a material mixing system at the same time, the weighing devices can be in close contact with the storage bins, the influence of external pipelines of the storage bins on weighing quality is avoided, the accuracy of material weighing and metering and the rapidity of ingredient conveying are greatly improved, meanwhile, the operation and the control are simple, the structure is stable, and the maintenance amount is small.

Example two:

referring to fig. 2 and 5, the difference between the first embodiment and the second embodiment is that the weighing hopper main body further includes a second weighing hopper 122, the first weighing hopper 121 and the second weighing hopper 122 are symmetrically disposed, a first blanking pipeline 111 and a second blanking pipeline 112 are respectively disposed between the first weighing hopper 121 and the second weighing hopper 122 and the storage bin 11, and the first blanking pipeline 111 and the second blanking pipeline 112 are both provided with a first gate valve 13 and a second gate valve 14, so that the first blanking pipeline 111 and the second blanking pipeline 112 respectively control the material in the storage bin 11 to fall into the first weighing hopper 121 or fall into the second weighing hopper 122, when the first weighing hopper 121 in the system fails or is maintained, the system controls the second weighing hopper 122 to weigh, or when the raw material to be weighed exceeds the range of the first weighing hopper 121, the first weighing hopper 121 and the second weighing hopper 122 are simultaneously used for weighing and metering the raw material.

Specifically, when the first weighing hopper in any one of the first, second, third and

fourth bins

11A, 11B, 11C and 11D cannot work and the bin 11 receives a batching message from the control system, the first gate valve 13 is opened to discharge the materials in the bin 11 into the second weighing hopper 122 for weighing and metering. When the material discharged into the second weighing hopper 122 in the silo 11 reaches the expected weighing value, the corresponding first gate valve 13 is closed, and the material discharge is stopped.

Through the application of the second weighing hopper 122, the time for taking shutdown to maintain when the weighing device of the batching system breaks down is reduced, the raw material waste caused by shutdown is reduced, and the production efficiency is improved. Meanwhile, the condition that the proportion of a single ingredient is large and the ingredient exceeds the weighing range is avoided, so that the accurate metering and batching system can adapt to the ingredient under the condition of more complex adaptability.

Example three:

referring to fig. 3 and 6, the difference between the first embodiment and the second embodiment is that the bunker 11 of the batching system of the present invention preferably includes four groups 11A, 11B, 11C, 11D, the third and fourth bunkers 11C, 11D are fixedly connected to form an independent bunker, a third blanking pipeline 113 and a fourth blanking pipeline 114 are respectively disposed between the third and fourth bunkers 11C, 11D and the first weighing hopper 121, a third gate valve 15 and a fourth gate valve 16 are disposed on the third and fourth blanking pipelines 113, 114, the batching system uses a weighing device to weigh two raw materials (such as a raw material and a raw material B) that are not commonly used in the bunker 11 or cannot be simultaneously present in the formula according to different use frequencies and matching conditions of the raw materials, and when the first raw material in the third bunker 11C needs to be added, the system opens the third gate valve 15 to allow the first raw material in the third bunker 11C to fall into the first weighing hopper 121 through the third blanking pipeline 113 to be weighed Heavily, when the second raw materials in the fourth feed bin 11D need to be added, the fourth picture peg 16 is opened thereupon to the system, makes the second raw materials in the fourth feed bin 11D fall into through fourth unloading pipeline 114 and weigh in the first weighing fill 121, through the mode that can not use simultaneously the measurement of one set of weighing device of raw materials common use in will not commonly used raw materials or the prescription, has reduced the quantity of weighing device, under the condition that does not influence batching efficiency, has effectively practiced thrift batching system cost.

It should be understood that the above-mentioned embodiments are merely illustrative of the technical concept and features of the present invention, and are not intended to limit the scope of the present invention, which is defined by the following claims.

Claims

1. The utility model provides a quick feed proportioning system of accurate measurement, its characterized in that, includes feed proportioning system, compounding system, feeding system, feed proportioning system includes a plurality of feed bins, a plurality of weighing device, weighing device is including weighing the fill main part, it includes first weighing fill to weigh the fill main part, first weighing fill the feed inlet with be provided with first unloading pipeline between the feed opening of feed bin, weighing device with be provided with the conveying pipeline between the compounding system, material input in the hopper is corresponding in the first weighing fill, make it carry out the weighing measurement to the material, material in the first weighing fill is in under the effect of delivery system pass through conveying pipeline gets into carry out multiple material mixing in the compounding system, make feeding system carries the material of mixing to processing system and processes.

2. The rapid batching system with accurate metering according to claim 1, wherein the weighing hopper body further comprises a second weighing hopper, a second discharging pipeline is arranged between a feeding port of the second weighing hopper and a discharging port of the storage bin, materials in the storage bin are input into the corresponding second weighing hopper to be weighed and metered, the materials in the second weighing hopper enter the mixing system through the conveying pipeline under the action of the distribution system to be mixed with various materials, and the mixed materials are conveyed to the processing system by the feeding system to be processed.

3. The rapid batching system with accurate metering according to claim 2, wherein the first and second discharging pipelines are provided with a first gate valve to control the output of the materials in the hopper, and the discharging hopper of the weighing hopper main body is provided with a first material cutting valve to control the output of the materials in the weighing hopper main body.

4. The rapid batching system with precise metering as claimed in claim 1, wherein the batching system comprises a mixer and an intermediate hopper, the feed inlet of the mixer is provided with a first vacuum suction machine, one end of the feed delivery pipeline is fixedly connected with the feed inlet of the first vacuum suction machine, the other end of the feed delivery pipeline is provided with a feed delivery branch pipe between the weighing hopper bodies, the feed outlet of the mixer is connected with the feed inlet of the intermediate hopper through a pipeline, the feed outlet of the mixer is provided with a second gate valve to control the output of the batching in the mixer, and the feed outlet of the intermediate hopper is provided with a second material intercepting valve to control the output of the batching in the intermediate hopper.

5. The rapid batching system with precise metering as claimed in claim 4, wherein the processing system comprises a plurality of extruders, feed hoppers are arranged on feed inlets of the plurality of extruders, second vacuum suction machines are arranged on feed inlets of the feed hoppers, feed pipes are connected to feed outlets of the intermediate hoppers, and feed branch pipes are arranged between the feed pipes and the second vacuum suction machines.

6. An accurate metering and rapid dispensing system as claimed in claim 5, wherein the feed branch pipes are provided with third shut-off valves.

7. The rapid material proportioning system of claim 5, wherein the feeding system comprises a vacuum generator and a pneumatic pipeline, a first gas transmission pipeline is arranged between the pneumatic pipeline and the first vacuum suction machine, a second gas transmission pipeline is arranged between the first gas transmission pipeline and the processing equipment, a first air shutoff valve is arranged on the pneumatic pipeline to control the transmission power of the feeding system, a second air shutoff valve is arranged on the first gas transmission pipeline to control the on-off of the first gas transmission pipeline, gas transmission branch pipes are arranged between the second gas transmission pipeline and the gas inlet of the second vacuum suction machine, and third air shutoff valves are arranged on the gas transmission branch pipes.

8. The rapid dosing system with precise metering of claim 5, wherein the feeding system further comprises a filtering device, the filtering device comprises a plurality of filters, and the filters are respectively arranged in the feeding ports of the first and second vacuum suction machines and on the air inlet end of the pneumatic pipeline.

9. The rapid batching system with accurate metering according to claim 1, wherein any two of the bins are fixedly connected into a whole, a third blanking pipeline and a second blanking pipeline are respectively arranged between the first weighing hopper and the bins, and a third gate valve and a fourth gate valve are respectively arranged on the third blanking pipeline and the fourth blanking pipeline.