CN112223575A

CN112223575A - Efficient granulation system

Info

Publication number: CN112223575A
Application number: CN202010892282.6A
Authority: CN
Inventors: 徐志平; 马庆江; 张冰; 周云; 周全
Original assignee: Ningbo Helong New Material Co Ltd
Current assignee: Ningbo Helong New Material Co Ltd
Priority date: 2020-08-29
Filing date: 2020-08-29
Publication date: 2021-01-15

Abstract

The invention discloses an efficient granulating system, which relates to the field of wood-plastic production and comprises a spiral conveyor and a granulator butted with the spiral conveyor, wherein the spiral conveyor is provided with a plurality of weighing devices, and the total amount of materials added by all the weighing devices in unit time is equal to the total amount of materials added into the granulator by the spiral conveyor in unit time. The use of a plurality of weighing devices to add a plurality of components to the screw conveyor ensures that the amount of each component per unit volume corresponds to the respective specification. Then the whole material can be mixed under screw conveyer drives stirring to guarantee the homogeneity that the material mixes promptly, can carry the material to the granulator direction again. Therefore, the step of pretreatment mixing is omitted, and meanwhile, the production efficiency is improved.

Description

Efficient granulation system

Technical Field

The invention relates to the field of wood-plastic production, in particular to an efficient granulation system.

Background

Wood-Plastic Composites (WPC) are a new type of composite material which has been vigorously developed in recent years at home and abroad, and refer to a new Wood material which is prepared by mixing polyethylene, polypropylene, polyvinyl chloride and the like instead of a common resin adhesive with more than 35-70% of waste plant fibers such as Wood flour, rice husks, straws and the like, and then carrying out Plastic processing processes such as extrusion, die pressing, injection molding and the like to produce a plate or a section. The method is mainly used in industries such as building materials, furniture, logistics packaging and the like. The board is made by mixing plastic and wood powder according to a certain proportion and then performing hot extrusion molding, and is called as an extruded wood-plastic composite board.

The production of the wood plastic in the prior art mainly comprises four steps, and corresponding raw material components are prepared according to the requirements of the wood plastic; secondly, the raw materials are put into a mixer for mixing: thirdly, putting the mixture in the mixer into an extruder; and finally, melting and extruding the mixture by using an extruder through a die head to obtain the required wood-plastic composite board. For example, a formula of a wood-plastic composite material with publication number CN102838860A and a preparation method thereof adopt a similar process. Firstly, uniformly mixing dried wood powder, a coupling agent, an inorganic filler and a lubricant by a kneading machine, then uniformly mixing the wood powder and a base resin glue solution added with a curing agent to obtain a premix, and then carrying out compression molding, extrusion molding or injection molding and post-curing treatment to obtain a finished product.

Although the conventional production process is mixed by a mixing device in the early stage, the stacking density and the granularity of various raw materials are different. Therefore, even if the mixed materials are added into the granulator from the mixing device, the materials are still easy to delaminate in the conveying process, and the overall performances of the final product are not uniformly maintained.

Disclosure of Invention

The invention aims to provide an efficient feeding system, which can save part of operation steps and ensure the uniformity of the overall characteristics of a wood-plastic composite board.

The above object of the present invention is achieved by the following technical solutions: the utility model provides a high-efficient granulation system, includes screw conveyer and the granulator that docks with screw conveyer, the last a plurality of weighing device that is equipped with of screw conveyer, and the total amount of material that all weighing device added in the unit interval equals the total amount of material that screw conveyer added in the granulator in the unit interval.

Through adopting above-mentioned technical scheme, utilize a plurality of weighing device to add multiple component in to screw conveyer, can guarantee screw conveyer's discharge gate department like this, the quantity of each component in every unit volume all accords with corresponding regulation. Then the whole material can be mixed under screw conveyer drives stirring to guarantee the homogeneity that the material mixes promptly, can carry the material to the granulator direction again. Therefore, the step of pretreatment mixing is also omitted under the condition of ensuring the uniform mixing of the materials, and the production efficiency of the wood-plastic plate is effectively improved.

Preferably, the weighing devices are arranged along the material conveying direction of the spiral conveyor, and the stacking density of the materials added into the spiral conveyor by the weighing devices is sequentially reduced along the direction close to the discharge hole of the screw pusher.

By adopting the technical scheme, on one hand, the components can enter the screw conveyor one by one to be mixed, and the mixing efficiency is improved. On the other hand, compared with the method that the components are added into the spiral conveyer at the same time, the method is not easy to cause blockage on the feed inlet of the spiral conveyer.

Moreover, because the material is along with the packing density from high to low adding screw conveyer in proper order, the material that the packing density is high also can promote the material that the packing density is low and move toward the feed inlet direction of granulator like this to help all materials to be carried to the granulator direction smoothly.

Preferably, the weighing device is a weightless scale or a flowmeter.

By adopting the technical scheme, if the weighing device is a weightless scale, the weighing device is helpful for accurately weighing solid materials and adding the solid materials into the screw conveyer. And the weighing device is a flowmeter, so that the fluid materials can be accurately taken and added into the spiral conveyer. Thereby widening the application range of the screw conveyer.

Preferably, a barrel is arranged at the feed inlet of the granulator and is connected with the discharge outlet of the screw conveyor.

Through adopting above-mentioned technical scheme, can make the material enter into the feed inlet department of granulator along the barrel like this in the barrel to the possibility of dust to external diffusion has been reduced.

Preferably, the discharge direction of the discharge port of the screw conveyor is consistent with the conveying direction of the material making machine.

By adopting the technical scheme, certain water vapor can be generated in the granulating process of the granulator. And the water vapor mainly flows out from one side of the feed inlet close to the material conveying direction. And then moves upward along the inner wall of the cylinder.

Because the discharging direction of the discharging port of the screw conveyor is consistent with the conveying direction of the material making machine, the discharging point of the discharging port of the screw conveyor is far away from the water vapor running-out position of the granulator. Therefore, the probability of direct contact of the materials with water and air can be reduced, and the possibility of wall adhesion of the materials in the cylinder body due to moisture is reduced.

Preferably, the length of the screw thread of the screw conveyer in the cylinder is more than 0 and less than or equal to the radius of the cylinder.

Through adopting above-mentioned technical scheme, can further reduce like this from the material that screw conveyer's discharge gate goes out and the steam that comes out from the feed inlet of granulator and take place the contact to the possibility that the material took place to glue the wall in barrel inside has also further been reduced.

Preferably, the height difference between the screw conveyor and the granulator is 1-1.5 m.

Through adopting above-mentioned technical scheme, set up the difference in height of screw conveyer and granulator at 1 ~ 1.5m, so on the one hand can be convenient for each equipment arrange in the factory, on the other hand also can reduce the possibility that each material falls the in-process and takes place to contact with steam in the barrel.

Preferably, the top of the barrel or the upper surface of the spiral conveyor is provided with a ventilation opening corresponding to the feed inlet of the granulator.

Through adopting above-mentioned technical scheme, when the material falls the in-process of granulator, the air of being extruded can be looked after smoothly and leave the system through ventilative mouthful to, also guaranteed that the material can enter into the granulator smoothly.

Preferably, the air vent is sleeved with a dust removal bag.

Through adopting above-mentioned technical scheme, dust is when running out to ventilative mouthful direction along with the air in the material like this, and it can be caught by the dust removal bag to the possibility of dust diffusion in to operational environment has been reduced.

Preferably, the screw of the screw conveyer has opposite screw threads on both sides of the discharge port.

Through adopting above-mentioned technical scheme, when the material was pushed to the discharge gate along with the screw thread of screw rod one side, if the material can not drop from the screw thread of this side when coming off, the opposite side screw thread of screw rod will the antiport, block that the material continues to move along the screw thread to just also can guarantee that the material can fall smoothly.

In conclusion, the beneficial technical effects of the invention are as follows:

1. the spiral conveyer is used for feeding materials into the granulator, so that the materials in each unit volume can be ensured to meet corresponding regulations, and meanwhile, the spiral conveyer can effectively realize uniform mixing of the materials in the conveying process, thereby not only saving the use of a high-speed mixer, but also being beneficial to improving the efficiency of continuous granulation;

2. the material weighing devices sequentially add materials into the spiral conveyor along the conveying direction of the spiral conveyor from high to low along with the stacking density of the materials, so that the materials are mixed favorably, and the probability of blockage in the material adding process can be reduced;

3. utilize the barrel to be connected screw conveyer and granulator, and the ejection of compact direction of screw conveyer's discharge gate is unanimous with granulator transported substance material direction, can make like this between the material of the steam that the granulator produced and whereabouts reduce the probability of mutual contact to the material has been reduced and has taken place the possibility of gluing the wall in the barrel.

Drawings

Fig. 1 is a schematic diagram of a high-efficiency granulation system.

In the figure, 1, a screw conveyer; 11. a weighing device; 12. a ventilation opening; 13. a dust removal bag; 2. a granulator; 3. and (4) a cylinder body.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The first embodiment is as follows:

an efficient granulating system is sequentially communicated with a screw conveyor 1, a granulator 2 and a storage tank 3.

Firstly, a plurality of weighing devices 11 are communicated above the screw conveyor 1, the number of the weighing devices 11 can be designed according to actual conditions, and the weighing devices 11 are arranged along the direction of conveying materials by the screw conveyor 1. Here, the total amount of material that all weighing devices 11 add to the screw conveyor 1 is equal to the total amount of material that the screw conveyor 1 pushes out. This ensures that the proportion of material falling into the granulator 2 is uniform per unit volume. Therefore, the continuous material conveying can be ensured, the material mixing function is realized, and the production efficiency is improved.

Furthermore, the weighing device 11 can be selected according to the physical state of the components to be delivered, for example, a solid powder material can be weighed by a weightless scale, and a fluid material can be metered by a flowmeter.

Meanwhile, the weighing devices 11 are arranged one by one along the material pushing direction of the screw conveyor 1, and the material descending along the material conveying direction of the screw conveyor 1 by each weighing device 11 is gradually reduced along with the stacking density of the material. Enter into screw conveyer 1 with the material one by one like this in, be convenient for carry out the homogeneous mixing between each material, on the other hand also the material that the packing density is high that adds earlier promotes the material that the packing density is low that adds after the back and moves forward to reduced the material that the packing density is low and detained the possibility in screw conveyer 1 inside.

Secondly, the discharge opening of the screw conveyor 1 here is located below the screw conveyor 1 and close to the motor of the screw conveyor 1. Meanwhile, the discharge port of the screw conveyor 1 is directly butted with the feed port of the granulator 2 along the vertical direction through a cylinder 3. And the discharge point of the discharge hole of the screw conveyor 1 is positioned in the direction of the barrel 3 deviating from the material conveying direction of the granulator 2.

On one hand, the barrel 3 can basically transfer the total amount of the materials conveyed by the screw conveyor 1 in unit time into the granulator 2, and on the other hand, can inhibit dust generated by the materials from diffusing into the environment. Meanwhile, in the production process of the granulator 2, water vapor is generated at one side of the feeding hole along the material conveying direction, and then the water vapor rises. And the discharge point of screw conveyer 1 is located the one side of barrel 3 along granulator 2 transported substance opposite direction, can avoid the probability that the material directly contacts with steam like this to the in-process that has reduced the material and has fallen in barrel 3 takes place the probability of gluing the wall.

In addition, after the material enters the barrel 3, the material can be separated from the threads, and the material mainly does free-fall movement, so that the length of the screw conveyor 1 in the axial direction of the threads in the barrel 3 is controlled to be less than or equal to the radius of the barrel 4. Here, 1/2 of barrel 3 radius is controlled to the length of screw thread, so can enough guarantee that the material can be pushed to in the barrel 3 smoothly, on the other hand also can reduce the probability that the material takes place to contact with the steam that rises.

Furthermore, the screw has a reverse thread in the barrel 3 in the direction away from the material transport, which is symmetrical to the forward thread of the material in the transport direction in the barrel 3, so that the material, after being pushed out by the forward thread, cannot fall off the thread in good time if this is not possible. The reverse thread prevents the material from continuing to move forward and fall into the granulator 2, thereby ensuring that the material falls within the designated area and further reducing the likelihood of the material coming into contact with moisture.

And, screw conveyer back to granulator 2's feed inlet one side seted up ventilative mouthful 12, and ventilative mouthful 12 is corresponding with the feed inlet along vertical direction, and the steam that produces like this can be got rid of from ventilative mouthful 12. In addition, in order to prevent the dust from diffusing into the environment from the ventilation opening 12, a dust removal bag 13 is further provided on the ventilation opening 12, and the possibility of the dust diffusing into the environment can be suppressed.

Moreover, in order to further reduce the probability of the contact between the rising water vapor and the falling materials and meet the requirement of the setting height of the device in the actual production process, the height difference between the screw conveyor 1 and the granulator 2 is controlled to be 1-1.5 m, and 1.3m is selected here.

Finally, utilize the fan to carry the granule that granulator 2 produced to the stock chest, and the stock chest is linked together through vacuum tube and low reaches production facility, when low reaches production facility needs the material like this, granule just can be carried to low reaches production facility under the condition of vacuum tube negative pressure in the stock chest to be convenient for improve the degree of automation of enterprise.

Application example one:

50 parts of high-density polyethylene, 10 parts of polypropylene, 50 parts of ethylene acrylic acid copolymer, 10 parts of kaolin, 10 parts of pentaerythritol, 0.8 part of oxidized polyethylene wax and 1.1 part of sodium dodecyl benzene sulfonate are sequentially added into a spiral conveyer through a weighing device according to the stacking density, and particles are obtained in a storage tank.

Comparative example one:

the comparative example differs from example one only in that the screw conveyor was changed to a mixer and the material in the mixer was transferred to the feed inlet of the granulator. And (3) adding all the components in the application example I into a mixer, uniformly mixing, and finally obtaining the particles in a storage tank.

Comparative example two:

the comparative example only differs from the first example in that the materials of the first application example are added into the screw conveyor from small to large according to the stacking density, and finally, the particles are obtained in the storage tank.

Comparative example three:

the comparative example differs from example one only in that the screw of the screw conveyor has no reverse flight in the barrel.

Comparative example four:

the difference between the comparative example and the first example is that the discharge point of the screw conveyor in the cylinder is positioned on one side consistent with the material conveying direction of the granulator.

The test was carried out by sampling 5 groups for the above application example one, comparative example one to comparative example four, respectively, in the following flame retardant manner: reference is made to the european standards institute EN 13501-1: 2007+ A1: 2009 classification of the combustion performance of building products and parts, classification according to the test data of combustion test reactions, the test is carried out, and the specific test standards refer to EN ISO 13823 monomer combustion test of building materials or products, EN ISO 11925-2 building material flammability test, wherein the specific standards of class C are: figra (burn rate index) is less than or equal to 250W/S, and the larger the Figra index is, the faster the burn is increased. The results are shown in table one:

watch 1

Figra(W/S)	Group 1	Group 2	Group 3	Group 4	Group 5
						Application example one	130	131	131	129	130
Comparative example 1	137	130	124	128	136
						Comparative example No. two	134	132	132	126	132
Comparative example No. three	131	136	132	126	126
						Comparative example No. four	129	128	129	134	132

To summarize the first: as can be seen from the comparison of the test results of the application example I and the comparative examples I and II, the automatic feeding system can effectively improve the uniformity of component mixing.

Taking the granulator for producing 900Kg of product per hour as an example, the energy consumption of the application example I and the comparative example I is calculated, and the specific results are as follows:

application examples two,

Utilize 7 roots's fan to carry out the feed supplement in 7 feed supplement storehouses, later 7 feed supplement storehouses carry out the feed supplement to 7 weightless scales respectively, 7 weightless scales feed into a screw conveyer respectively at last, screw conveyer mixes the material after will mixing simultaneously and puts into the granulator together and granulate, and the plastic granules who obtains are carried to the storage tank through broken fan and are stored for follow-up use.

The total power consumed by each device is specifically shown in the following table two

Watch two

Total energy consumption (roots blower, feeding bin, weightless scale, screw conveyer, granulator, crushing blower)/(900/1000) 310.5KW/h t

Comparative example V,

Utilize 7 roots's fans to add in 1 high machine that mixes, the total mass of adding in every turn is 200Kg, and the high machine that mixes adds the material that mixes in the granulator and carries out the granulation, and the plastic granules that obtains is carried to the stock chest through broken fan and is stored to follow-up use.

The total power consumed by each device is shown in table three below

Watch III

Device name	Parameter(s)	Total power consumed in 1 hour
			Roots blower	11KW/h	/
Longest single operation time of Roots blower	5min	4.125KW
			High mixing machine power	110KW/h	/
Single run time of high-speed mixer	400S	55KW
			Granulating machine	/	250KW
Crushing fan	/	7.5KW

Total energy consumption (roots blower + high mixer + granulator + crushing blower)/(900/1000) ═ 360.14KW/h t

Summarizing the second step: from the above-mentioned total energy consumption, the present application is more energy-efficient than the conventional granulation process using a high-speed mixer.

In addition, when the whole system was operated for one day, 1m of the inner wall of the cylinder of application example one and comparative examples three and four was observed²And the amount of the material sticking to the wall, the results are shown in table four:

watch four

Item	Application example one	Comparative example No. three	Comparative example No. four
				Amount of material sticking to wall	4	16	38

Summarizing three steps: it can be seen from table four, the problem of material emergence gluing wall on the barrel inner wall can be avoided effectively to the screw conveyer's of this application setting.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

Claims

1. An efficient granulating system, comprising a screw conveyor (1) and a granulator (2) butted with the screw conveyor (1), characterized in that: the spiral conveyor (1) is provided with a plurality of weighing devices (11), and the total amount of materials added into the spiral conveyor in unit time by all the weighing devices (11) is equal to the total amount of materials added into the granulator (2) in unit time by the spiral conveyor (1).

2. A high efficiency pelletizing system according to claim 1, characterized by: the weighing devices (11) are arranged along the material conveying direction of the spiral conveyor (1), and the stacking density of the materials added into the spiral conveyor (1) by the weighing devices (11) is sequentially reduced along the direction close to the discharge hole of the spiral conveyor (1).

3. A high efficiency pelletizing system as set forth in claim 2, wherein: the weighing device (11) is a weightless scale or a flowmeter.

4. A high efficiency granulation apparatus as defined in claim 1, wherein: a barrel (3) is arranged at the feed inlet of the granulator (2), and the barrel (3) is connected with the discharge outlet of the screw conveyor (1).

5. A high efficiency granulation apparatus as defined in claim 4, wherein: the discharging direction of the discharging port of the spiral conveyor (1) is consistent with the conveying direction of the material making machine.

6. A high efficiency granulation system as defined in claim 5, wherein: the length of the screw thread of the screw conveyer (1) in the cylinder (3) is more than 0 and less than or equal to the radius of the cylinder (4).

7. A high efficiency granulation system as defined in claim 6, wherein: the height difference between the screw conveyor (1) and the granulator (2) is 1-1.5 m.

8. A high efficiency granulation system as defined in claim 5, wherein: and a ventilation opening (12) is formed in the top of the barrel (3) or the upper surface of the spiral conveyor (1) corresponding to the feed inlet of the granulator (2).

9. A high efficiency pelletizing system according to claim 8, characterized in that: the air vent (12) is sleeved with a dust removal bag (13).

10. A high efficiency pelletizing system according to claim 1, characterized by: the screw of the screw conveyor (1) has opposite thread directions at two sides of the discharge hole.