WO2020151770A1

WO2020151770A1 - Waste gas collection system and method for extruder, and plastic extrusion system and method

Info

Publication number: WO2020151770A1
Application number: PCT/CN2020/075753
Authority: WO
Inventors: 李东; 马鹏涛; 莫凡; 齐文良; 左攀; 廖洋威
Original assignee: 金发科技股份有限公司
Priority date: 2019-01-22
Filing date: 2020-02-18
Publication date: 2020-07-30
Also published as: CN109591272A; CN109591272B; WO2020151770A8

Abstract

Provided are a waste gas collection system and method for an extruder, and a plastic extrusion system and method. A sealed space is formed between a water curtain and the liquid surface in a cooling water tank so as to prevent the waste gas emitted from a discharge port and the waste water from melted plastic material volatilization from being dispersed into the external atmosphere, such that the waste gas can be all isolated in the sealed space, thereby enhancing the concentration of the waste gas in the gas recovered. During recovery, a gas suction assembly can be started and needs to generate only a small negative pressure and gas volume to completely collect the waste gas inside of the sealed space. The present invention addresses the problem of existing open waste gas recycling not being thorough, substantially reduces the power of the gas suction assembly, and lowers energy consumption, noise, and equipment cost. Additionally, the sealed space formed by the water curtain has a relatively small impact on the production process, and an operator can observe the state inside of the sealed space in a timely manner, and no substantial modification needs to be made to the current structure.

Description

Exhaust gas collection system and method for extruder, plastic extrusion system and method

Technical field

The invention relates to the field of plastic preparation and extrusion and waste gas collection, in particular to a waste gas collection system and method for an extruder, and a plastic extrusion system and method.

Background technique

At present, the granulation method commonly used in plastic extruders is: plastic is extruded from the head of the plastic extruder into a continuous molten strip, cooled in a water tank into a plastic strip, and pulled by a pelletizer to cut into finished particles. In the process of plastic extrusion granulation production process, due to the high temperature and high pressure processing conditions, it will inevitably produce high temperature oil smoke (plasticizer), dust, very small glass fiber filaments, and high temperature cracking to produce gaseous state. Organic Pollutants. For example, the high-temperature die and the low-temperature cooling water should not be in direct contact. VOC exhaust gas is mainly generated in the area before the molten plastic strip is extruded from the plastic extruder die and enters the cooling water tank. This volatile organic compound waste gas is accompanied by a large amount of foul odor. If it is not effectively recycled and treated, a large amount of unorganized exhaust gas will be generated, which will harm the health of residents and production employees in the surrounding areas.

At present, the commonly used waste gas collection method is: install a recovery cover at a distance above the plastic extruder head, use a negative pressure fan to extract a large amount of air from the recovery cover, and carry the volatile organic compounds generated during the pelletizing process of the plastic extruder The exhaust gas enters the recovery pipeline and the treatment device. However, this waste gas collection method has many shortcomings: First, in order to maintain a good view of the position of the plastic extruder head and detect abnormalities in time, the recovery cover and the plastic extruder head must be kept at a distance. Between the recycling hoods, carrying the volatile organic compound waste gas requires a larger air volume, but the pipe resistance, energy consumption and waste gas treatment volume also increase with the air volume, and the overall cost of the system is relatively high; second, due to the distance between the recycling hood and the plastic extrusion The machine has a certain distance and is affected by the airflow of the surrounding environment, so that part of the volatile organic waste gas cannot be recovered and escapes into the external environment; third, the volatile organic compound waste gas will condense on the inner wall of the pipeline, and the accumulated oil pollution will be Flammable substances bring safety hazards to production; fourth, due to the large amount of air diluting the volatile organic compound waste gas, the waste gas concentration becomes lower, and most waste gas treatment methods will reduce the treatment efficiency when the waste gas concentration is too low. Additional energy consumption.

Summary of the invention

In order to overcome the shortcomings of the prior art, the present invention provides an exhaust gas collection system and method for an extruder, and a plastic extrusion system and method. The specific technical solutions are as follows:

An exhaust gas collection system for an extruder, including:

The water curtain generating assembly is configured to generate a water curtain to enclose a closed space between the head of the extruder and the liquid level of the cooling water tank, so that the exhaust gas discharged from the head is blocked in the closed space;

An air extraction assembly, the air extraction port of the air extraction assembly is arranged in the enclosed space.

In a preferred embodiment, the water curtain generating assembly includes:

A water curtain generator configured to generate the water curtain;

The water supply pipeline is configured to provide the water flow required by each of the water curtain generators to form the water curtain.

In a preferred embodiment, the water curtain generator includes a plurality of water curtain nozzles, which are configured to respectively form a plurality of water curtains on the periphery of the machine head, and the plurality of water curtains intersect with the machine head. The enclosed space is enclosed with the liquid surface of the cooling water tank.

In a preferred embodiment, the water curtain generator includes an annular water spray port configured to form an annular water curtain to enclose the closed space with the liquid level of the handpiece and the cooling water tank.

In a preferred embodiment, the water curtain enclosing the closed space has an inner and outer multilayer structure.

In a preferred embodiment, the machine head is provided with a base, the water curtain generator is fixed on the base, and the water curtain generator is configured to be able to adjust the installation angle and the water curtain on the base Generate direction.

In a preferred embodiment, a regulating valve is provided in the water supply pipeline.

In a preferred embodiment, the water supply pipeline includes a water inlet main pipe, a pipeline distributor, and a plurality of water inlet branch pipes, and each of the water inlet branch pipes is connected to one or more water curtain nozzles, and the pipeline The distributor is arranged between the water inlet main pipe and the plurality of water inlet branch pipes.

In a preferred embodiment, it further includes a gas purification assembly configured to purify the gas extracted by the air extraction assembly.

In a preferred embodiment, the inlet pressure of the water curtain generator is above 0.1 MPa;

And/or, the thickness of the water curtain is between 0.05mm-1mm;

And/or, the pipe diameter of the suction pipe of the suction component is DN6-DN65;

And/or, the air volume generated by the air extraction assembly is 10-300m ³ /h.

A method for collecting exhaust gas from an extruder uses the exhaust gas collection system for an extruder described in any one of the foregoing embodiments to perform the following operations:

Start the water curtain generating assembly to generate a water curtain, so that the water curtain encloses a closed space between the head and the liquid level of the cooling water tank, so that the exhaust gas discharged from the head is blocked in the In a closed space

The air extraction assembly is activated to generate a negative pressure in the enclosed space, so that the exhaust gas discharged from the handpiece is sucked from the air extraction port and then sucked away by the air extraction assembly.

A plastic extrusion system, including:

An extrusion device configured to extrude plastic from the die of the extrusion device;

A cooling water tank is arranged under the machine head to receive and cool the plastic;

In a preferred embodiment, the water curtain generating assembly includes:

A water curtain generator configured to generate the water curtain;

And/or, the thickness of the water curtain is between 0.05mm-1mm;

And/or, the pipe diameter of the suction pipe of the suction component is DN6-DN65.

In a preferred embodiment, the water curtain generating assembly is further configured to generate a water curtain whose water flow direction is consistent with the moving direction of the plastic from below the plastic outlet of the handpiece, so that the water curtain can be The material is cooled, and the water curtain overlaps the material to the plastic that is normally towed.

In a preferred embodiment, the water curtain that cools the broken material and overlaps the broken material to the normally towed plastic has a multi-layered structure.

A plastic extrusion system, including:

The water curtain generating assembly is configured to generate a water curtain whose water flow direction is consistent with the moving direction of the plastic from below the plastic outlet of the machine head, so that when the plastic material is broken, the water curtain can cool the material and the water The curtain overlaps the broken material to the plastic that is normally towed.

A plastic extrusion method uses the aforementioned plastic extrusion system to perform the following operations:

Start the extrusion device and start extruding plastic;

The water curtain generating assembly is activated, and a water curtain whose water flow direction is consistent with the moving direction of the plastic is generated from below the plastic outlet of the machine head, so that when the plastic material is broken, the water curtain can cool the material, and the The water curtain overlaps the broken material to the plastic that is normally towed;

The cooling water tank receives and cools the plastic below the plastic outlet.

The present invention has at least the following beneficial effects:

In the present invention, a closed space can be formed between the water curtain and the liquid surface of the cooling water tank. The closed space can flexibly seal the space between the extruder head and the cooling water tank. On the one hand, it can prevent the exhaust gas discharged from the head and The exhaust gas volatilized in the molten plastic strip diffuses into the outside air, so that all the exhaust gas can be blocked in the enclosed space. The air extraction port of the air extraction assembly is set above the gas discharge opening in the enclosed space. Only by starting the air extraction assembly to generate a small negative pressure and air volume, the exhaust gas in the enclosed space can be thoroughly collected to make the extracted volatile exhaust gas concentration Increase and decrease the air volume, thereby reducing the energy consumption of the air extraction components. Compared with the fan in the prior art extracting a large amount of air from the recovery hood, the present invention can not only solve the defect of incomplete recovery of exhaust gas in the existing open type, but also can significantly reduce the power of the air extraction assembly, thereby reducing energy consumption, noise and equipment cost. Moreover, due to the good see-through and flexibility of the water curtain, the closed space formed by the water curtain has little impact on the production process. The operator can not only observe the state in the closed space in time, but also does not need to make major changes to the existing structure. .

On the other hand, the water curtain can reduce the temperature of the volatile exhaust gas, condense some volatile substances in advance, and no longer enter the air extraction components, reducing the possibility of oil contamination on the inner wall of the pipeline, thereby reducing fire hazards.

In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, preferred embodiments are described below in detail with accompanying drawings.

Description of the drawings

In order to explain the technical solutions of the embodiments of the present invention more clearly, the following will briefly introduce the drawings needed in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore do not It should be regarded as a limitation of the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative work.

Figure 1 is a schematic diagram of the plastic strip preparation system in Example 1 of the present invention;

2 is a partial perspective view of the plastic strip preparation system in Example 1 of the present invention;

3 is a partial schematic diagram of the plastic strip preparation system in Example 2 of the present invention;

4 is a partial perspective view of the plastic strip preparation system when the strip is broken in Example 2 of the present invention;

Figure 5 is a partial perspective view of the plastic strip preparation system when the break strip is overlapped with the normal plastic strip in Example 2 of the present invention.

Symbol description of main components:

1‐Extrusion device; 2‐Base; 3‐The first group of water curtain nozzles; 4‐Plastic strip; 5‐Water curtain; 6‐Enclosed space; 7‐Exhaust port; 8‐Pipe; 9‐Purification component; 10‐ Negative pressure generating device; 11-inlet water main pipe; 12-pipeline distributor; 13-inlet branch pipe; 14-switch; 15-cooling water tank; 16-nose; 18-broken bar; 19-second set of water curtain Sprinkler.

detailed description

The present invention will be further described below in conjunction with specific embodiments. Among them, the drawings are only for illustrative purposes and cannot be understood as a limitation of the patent; in order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product For those skilled in the art, it is understandable that some well-known structures in the drawings and their descriptions may be omitted.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there are the terms "upper", "lower", "left", and "right" The orientation or positional relationship of other indications is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the pointed device or element must have a specific orientation or a specific orientation. The azimuth structure and operation, therefore, the terms describing the positional relationship in the drawings are only for exemplary description and cannot be understood as a limitation of the patent. For those of ordinary skill in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

The expressions (such as "first", "second", etc.) used in the various embodiments of the present invention can modify various constituent elements in the various embodiments, but may not limit the corresponding constituent elements. For example, the above expression does not limit the order and/or importance of the elements. The above description is only used for the purpose of distinguishing one element from other elements. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, without departing from the scope of various embodiments of the present invention, the first element may be referred to as the second element, and similarly, the second element may also be referred to as the first element.

It should be noted that in this utility model, unless otherwise clearly specified and defined, terms such as "installation", "connection", and "fixation" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. , Or integrally connected; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication between two components. For those of ordinary skill in the art, the specific meaning of the above-mentioned terms in the present utility model can be understood according to specific circumstances.

Example 1

As shown in Figures 1 and 2, this embodiment provides a plastic strip preparation system and method. The plastic strip preparation system includes an extrusion device 1, a cooling water tank 15, a water supply pipeline, a plurality of water curtain nozzles, and air extraction Components.

The extrusion device 1 is configured to extrude the plastic strip 4 from the plastic strip outlet of the extrusion device 1. Specifically, the extrusion device 1 is used for mixing, melting and extruding engineering plastics, modified plastics, wood plastic materials, elastomer materials, high-filling masterbatches, color masterbatches, degradable materials, packaging materials, telecommunication cables and other materials. After compression molding, it is output from the outlet of the plastic strip. For the specific structure of the extrusion device 1, refer to ZL201080071151.6 or ZL201010599578.5, etc., which will not be repeated in this embodiment.

As shown in FIGS. 1 and 2, the cooling water tank 15 is provided below the outlet of the plastic strip to receive and cool the plastic strip 4. Specifically, the top of the cooling water tank 15 is open, and the cooling water tank 15 is provided with a traction mechanism such as a roller, and the plastic strip 4 extruded from the outlet of the plastic strip is introduced into the cooling water tank 15 to cool down.

In this embodiment, the water supply pipeline is configured to provide the water flow required by each water curtain nozzle to form the water curtain 5. As a preferred water supply structure, the water supply pipeline includes a water inlet main pipe 11, a pipeline distributor 12, and a plurality of water inlet branch pipes 13, each of which is connected to one or more water curtain nozzles, and the pipeline distributor 12 It is arranged between the water inlet main pipe 11 and a plurality of water inlet branch pipes 13. Thus, the water flow introduced from the water inlet main pipe 11 flows into the multiple water inlet branch pipes 13 after passing through the pipeline distributor 12, and then connects the corresponding water curtain nozzles through the multiple water inlet branch pipes 13 to provide each water curtain nozzle to generate the water curtain 5 The required water flow. Preferably, a control valve (not shown in the figure) is provided on the water inlet main pipe 11 and/or multiple water inlet branch pipes 13, so that the operator can control the on and off of the water inlet main pipe 11 or the water inlet branch pipe 13, thereby controlling all The start or stop of the water curtain sprinklers or part of the water curtain sprinklers, and the flow rate, quantity, angle and other parameters of the water curtain 5 can be adjusted by adjusting the opening degree of the control valve.

As shown in Figures 1 and 2, the water curtain nozzles are configured to form water curtains 5 around the outlets of the plastic strips. This embodiment shows a preferred water curtain nozzle installation structure. One end of the extruding device 1 has a head 16, and the plastic strip outlet is formed on the head 16. The head 16 is provided with a base 2 and each water curtain nozzle is fixed. On the base 2. Preferably, the water curtain nozzle is configured to be able to adjust the installation angle on the base 2 and the direction of the water curtain 5.

Wherein, after at least a part of the plurality of water curtains 5 intersect, a closed space 6 is enclosed between the liquid surface of the cooling water tank 15 so that the exhaust gas discharged from the outlet of the plastic strip is blocked in the closed space 6. Specifically, the plurality of water curtain nozzles includes a first group of water curtain nozzles 3, and the first group of water curtain nozzles 3 generates water curtains 5 in multiple directions, and these water curtains 5 in multiple directions have various cross structures.

In a preferred cross structure, the water curtain 5 formed by the first group of water curtain nozzles 3 includes at least a water curtain 5 above the plastic strip 4 along the moving direction of the plastic strip 4, a water curtain 5 on the left side of the plastic strip 4, and a plastic strip 4 The water curtain 5 on the right side, the water curtain 5 under the plastic strip 4 along the moving direction of the plastic strip 4, the aforementioned water curtains 5 in each direction cross each other to form an irregular quadrilateral structure, the head 16 and base 2 of the extruder The top of the quadrilateral structure is closed, and the liquid surface of the cooling water tank 15 closes the bottom of the quadrilateral structure, thereby forming a closed space 6 enclosed by the water curtain 5 and the liquid surface of the cooling water tank 15.

In another preferred cross structure, the water curtain 5 formed by the first group of water curtain nozzles 3 forms a triangular cone cross structure, and the liquid surface of the cooling water tank 15 closes the bottom of the triangular cone cross structure, thereby forming a water curtain A closed space 6 enclosed by the liquid level of the cooling water tank 15 after crossing.

It should be noted that the aforementioned two water curtain 5 cross structures listed in this embodiment are only two of the preferred ones. In fact, there are other preferred cross structures, such as irregular pentagonal structures or more crossed structures. Structures. For other types of water curtain 5 cross structures, this embodiment will not repeat them, but these are also within the protection scope of this patent.

In this embodiment, as shown in FIGS. 1 and 2, the suction port 7 of the suction assembly is arranged above the plastic strip outlet in the enclosed space 6. The suction component generates a negative pressure in the enclosed space 6, so that the exhaust gas in the process of extruding the plastic strip 4 from the extrusion device 1 is sucked from the suction port 7 and then sucked by the suction component. Specifically, the air extraction assembly includes a negative pressure generating device 10, a pipe 8 and other structures. The negative pressure generating device may be a fan. One end of the pipe 8 is located above the plastic strip outlet in the enclosed space 6, that is, the port at one end of the pipe 8 is formed The suction port 7 and the other end of the pipe 8 are connected with a negative pressure generating device. Preferably, the suction port 7 is equipped with a tapered flow deflector. Preferably, the pipe 8 is equipped with a switch 14.

Preferably, the plastic strip preparation system further includes a gas purification assembly 9 configured to purify the gas extracted by the air extraction assembly. Specifically, the gas purification assembly 9 includes a purification box, the air inlet and the air outlet of the purification box are connected with a pipe 8 as part of the gas extraction path. The purification box is provided with activated carbon, filter, ozone and other gas purification units to make the air The gas extracted by the components is purified by the purification box before being discharged.

The preparation method of the plastic strip preparation system in this embodiment includes the following operations:

S1: Start multiple water curtain nozzles to produce water curtain 5, make multiple water curtains 5 cross and enclose the liquid level of cooling water tank 15 to form a closed space 6, and seal the plastic strip outlet in the closed space 6;

S2: Start the extrusion device 1 and start extruding the plastic strip 4, make the plastic strip 4 enter the enclosed space 6 to cool down after leaving the plastic strip outlet, and then fall into the cooling water tank 15 after passing through the water curtain 5 to further cool down;

S3: Start the air extraction assembly to generate a negative pressure in the enclosed space 6, so that the exhaust gas in the process of extruding the plastic strip 4 from the extrusion device 1 is sucked from the air extraction port 7 and then sucked by the air extraction assembly.

It should be noted that, in the foregoing operation steps in this embodiment, it is preferable to operate in the order from S1 to S2 to S3. S1, S2, and S3 can also be started at the same time, or in other order, the writing between the steps The order cannot be interpreted as a restriction on the order of execution.

The plastic strip preparation system and method provided in this embodiment can form a closed space 6 between the water curtain 5 and the liquid level of the cooling water tank 15. The closed space 6 can flexibly seal the space between the plastic strip outlet and the cooling water tank 15. On the one hand, the exhaust gas discharged from the outlet of the plastic strip and the exhaust gas volatilized in the molten plastic strip 4 can be prevented from diffusing into the outside air, so that all of these exhaust gas can be blocked in the enclosed space 6. The air extraction port 7 of the air extraction assembly is set above the gas discharge opening in the enclosed space 6. Only by starting the air extraction assembly to generate a small negative pressure, the exhaust gas in the enclosed space 6 can be completely collected, so that the extracted volatile exhaust gas The concentration is increased and the air volume is reduced, thereby reducing the energy consumption of the air extraction components.

Compared with the fan in the prior art extracting a large amount of air from the recovery cover, this embodiment can not only solve the defects of the existing open-type recovery of exhaust gas incompletely, but also can significantly reduce the power of the air extraction assembly, thereby reducing energy consumption, noise and Equipment cost. Moreover, due to the good see-through and flexibility of the water curtain 5, the closed space 6 formed by the water curtain 5 has little impact on the production process. The operator can not only observe the state in the closed space 6 in time, but also does not need to control the existing structure. Make a big change.

On the other hand, the water curtain 5 can reduce the temperature of the volatile exhaust gas, so that some volatile substances will condense in advance and no longer enter the air extraction assembly. This reduces the possibility of oil stains condensing on the inner wall of the pipe 8, thereby reducing fire hazards.

Preferably, the water curtain 5 forming the closed space 6 is stacked in multiple layers. In this embodiment, since the water curtain 5 can be stacked with multiple layers, the sealing effect of the water curtain 5 can be improved. As a preferred multi-layer water curtain 5 formation structure, at least a part of the multiple water curtain nozzles, namely the first group of water curtain nozzles 3, are distributed in a multilayer array on the outer periphery of the plastic strip outlet from the inside to the outside, so that the formation is closed The water curtain 5 in the space 6 is superimposed on multiple layers. As another preferred multi-layer water curtain 5 formation structure, the first group of water curtain nozzles 3 are not distributed in a multilayer array from the inside to the outside on the outer periphery of the plastic strip outlet, but each water curtain nozzle has a preset installation angle and direction , So that the water curtain 5 produced by them is multi-layered.

Preferably, the inlet pressure of the water curtain nozzle is above 0.1 MPa. Since the water inlet pressure of the water curtain nozzle is above 0.1 MPa, the water curtain 5 has a greater speed and density, which not only facilitates the adjustment of the direction and angle of the water curtain 5, but also improves the sealing effect of the water curtain 5.

Preferably, the thickness of the water curtain 5 of the water curtain nozzle is 0.05 mm-1 mm. Since the thickness of the water curtain 5 is between 0.05mm-1mm, on the one hand, the water curtain 5 has a good sealing effect, on the other hand, excessive water flow is avoided, and the water curtain 5 has good perspective.

Preferably, the pipe diameter of the suction pipe 8 of the suction assembly is DN6-DN65.

Preferably, the air volume generated by the air extraction assembly is 10-300m ³ /h.

Preferably, the cooling water tank 15 is configured such that the water curtain 5 generated by each water curtain nozzle is injected into the cooling water tank 15. Thereby, the water in the water curtain 5 can be directly recovered by the cooling water tank 15, the structure can be simplified, and the water in the water curtain 5 can be prevented from affecting the site near the extrusion device 1.

Example 2

This embodiment provides a plastic strip preparation system and method. Compared with Embodiment 1, the main difference of this embodiment is:

As shown in Figure 3, there are multilayer water curtains 5 arranged at intervals below the outlet of the plastic strip. Another part of the plurality of water curtain nozzles, that is, the second group of water curtain nozzles 19, is arranged below the outlet of the plastic strip, and the water flow direction of the generated water curtain 5 is consistent with the moving direction of the plastic strip 4. If there is a broken strip 18 in the plastic strip 4 as shown in FIG. 4, the water curtain 5 produced by the second group of water curtain nozzles 19 contacts the broken strip 18 and cools the broken strip 18. Moreover, as shown in FIG. 5, under the impact of the water curtain 5 generated by the second group of water curtain nozzles 19, the broken strip 18 is overlapped with the plastic strip 4 that is normally towed.

Because there are multiple layers of water curtains 5 arranged at intervals below the plastic strip outlet, it can quickly cool down and take away the plastic strips 4 that fall due to the broken strips 18, and automatically lap to the plastic strips 4 that are normally drawn to prevent the plastic strips from being melted. The continuous accumulation of 4 forms large blocks.

Preferably, the water curtain nozzles are distributed in a multi-layer array from top to bottom below the plastic strip outlet, so as to form multiple layers of water curtains 5 arranged at intervals below the plastic strip outlet. Since multiple water curtains 5 are arranged at intervals below the plastic strip outlet, the broken strip 18 can be cooled from multiple positions, and the broken strip 18 can be supported from multiple positions to promote the overlap between the broken strip 18 and the normal plastic strip 4.

The other features of this embodiment are the same as those of Embodiment 1, and will not be repeated.

Those skilled in the art can understand that the drawings are only schematic diagrams of preferred implementation scenarios, and the modules or processes in the drawings are not necessarily necessary for implementing the present invention.

Those skilled in the art can understand that the modules in the device in the implementation scenario can be distributed in the device in the implementation scenario according to the description of the implementation scenario, or can be changed to be located in one or more devices different from the implementation scenario. The modules of the above implementation scenarios can be combined into one module or further divided into multiple sub-modules.

The above-mentioned serial number of the present invention is only for description, and does not represent the pros and cons of implementation scenarios.

The above disclosures are only a few specific implementation scenarios of the present invention, but the present invention is not limited to these, and any changes that can be thought of by those skilled in the art should fall into the protection scope of the present invention.

Claims

An exhaust gas collection system for an extruder, which is characterized in that it comprises:

The water curtain generating assembly is configured to generate a water curtain to enclose a closed space between the head of the extruder and the liquid level of the cooling water tank, so that the exhaust gas discharged from the head is blocked in the closed space;

An air extraction assembly, the air extraction port of the air extraction assembly is arranged in the enclosed space.
The exhaust gas collection system for an extruder according to claim 1, wherein the water curtain generating component comprises:

A water curtain generator configured to generate the water curtain;

The water supply pipeline is configured to provide the water flow required by each of the water curtain generators to form the water curtain.
The exhaust gas collection system for an extruder according to claim 2, wherein the water curtain generator includes a plurality of water curtain nozzles, which are configured to form a plurality of water curtains on the periphery of the die, and The two water curtains cross to form the closed space with the liquid surface of the nose and the cooling water tank.
The exhaust gas collection system for an extruder according to claim 2, wherein the water curtain generator includes an annular water jet configured to form an annular water curtain to interact with the liquid of the die and the cooling water tank. The enclosed space is enclosed between the faces.
The exhaust gas collection system for an extruder according to any one of claims 1-4, wherein the water curtain enclosing the closed space has an inner and outer multi-layer superimposed structure.
The exhaust gas collection system for an extruder according to claim 2, wherein a base is provided on the head, the water curtain generator is fixed on the base, and the water curtain generator is configured to Adjust the installation angle on the base and the direction of the water curtain.
The exhaust gas collection system for an extruder according to any one of claims 2-4, wherein a regulating valve is provided in the water supply pipeline.
The exhaust gas collection system for an extruder according to claim 3, wherein the water supply pipeline includes a water inlet main pipe, a pipeline distributor and a plurality of water inlet branch pipes, and each of the water inlet branch pipes is connected to one or The plurality of water curtain nozzles and the pipeline distributor are arranged between the water inlet main pipe and the plurality of water inlet branch pipes.
The exhaust gas collection system for an extruder according to any one of claims 1 to 4, further comprising a gas purification component configured to purify the gas extracted by the gas extraction component.
The exhaust gas collection system for an extruder according to claim 2, wherein the inlet pressure of the water curtain generator is above 0.1 MPa;

And/or, the thickness of the water curtain is between 0.05mm-1mm;

And/or, the pipe diameter of the suction pipe of the suction component is DN6-DN65;

And/or, the air volume generated by the suction assembly is 10-300 m 3 /h.
A method for collecting exhaust gas from an extruder, characterized in that the exhaust gas collection system for an extruder according to any one of claims 1-10 is used to perform the following operations:

Start the water curtain generating assembly to generate a water curtain, so that the water curtain encloses a closed space between the head and the liquid level of the cooling water tank, so that the exhaust gas discharged from the head is blocked in the In a closed space

The air extraction assembly is activated to generate a negative pressure in the enclosed space, so that the exhaust gas discharged from the handpiece is sucked from the air extraction port and then sucked away by the air extraction assembly.
A plastic extrusion system, characterized in that it comprises:

An extrusion device configured to extrude plastic from the die of the extrusion device;

A cooling water tank is arranged under the machine head to receive and cool the plastic;

The water curtain generating assembly is configured to generate a water curtain to enclose a closed space between the head of the extruder and the liquid level of the cooling water tank, so that the exhaust gas discharged from the head is blocked in the closed space;

An air extraction assembly, the air extraction port of the air extraction assembly is arranged in the enclosed space.
The exhaust gas collection system for an extruder according to claim 12, wherein the water curtain generating assembly comprises:

A water curtain generator configured to generate the water curtain;

The water supply pipeline is configured to provide the water flow required by each of the water curtain generators to form the water curtain.
The plastic extrusion system according to claim 13, wherein the water curtain generator comprises a plurality of water curtain nozzles, which are configured to respectively form a plurality of water curtains on the periphery of the machine head, and a plurality of The water curtain crosses to enclose the closed space with the liquid surface of the machine head and the cooling water tank.
The plastic extrusion system according to claim 14, wherein the water curtain generator comprises an annular water spray port configured to form an annular water curtain to be in contact with the liquid surface of the machine head and the cooling water tank. Enclose the enclosed space.
The plastic extrusion system according to any one of claims 12-15, wherein the water curtain enclosing the closed space has an inner and outer multilayer superimposed structure.
The plastic extrusion system according to claim 13, wherein a base is provided on the head, the water curtain generator is fixed on the base, and the water curtain generator is configured to be adjustable The installation angle on the base and the direction of the water curtain are described.
The plastic extrusion system according to any one of claims 13-15, wherein a regulating valve is provided in the water supply pipeline.
The plastic extrusion system according to claim 13, wherein the water supply pipeline includes a water inlet main pipe, a pipeline distributor and a plurality of water inlet branch pipes, and each of the water inlet branch pipes is connected to one or more In the water curtain nozzle, the pipeline distributor is arranged between the water inlet main pipe and the plurality of water inlet branch pipes.
The plastic extrusion system according to any one of claims 12-15, further comprising a gas purification assembly configured to purify the gas extracted by the air extraction assembly.
The plastic extrusion system according to claim 13, wherein the water inlet pressure of the water curtain generator is above 0.1 MPa;

And/or, the thickness of the water curtain is between 0.05mm-1mm;

And/or, the pipe diameter of the suction pipe of the suction component is DN6-DN65;

And/or, the air volume generated by the suction assembly is 10-300 m 3 /h.
The plastic extrusion system according to any one of claims 12-15, wherein the water curtain generating assembly is further configured to generate water flow from below the plastic outlet of the handpiece in a direction consistent with the movement direction of the plastic. The water curtain can cool the material when the plastic material is broken, and the water curtain overlaps the material to be normally hauled plastic.
The plastic extrusion system according to claim 22, characterized in that the water curtain that cools the material cut and overlaps the material cut to the normally drawn plastic is a multi-layer superimposed structure.
A plastic extrusion system, characterized in that it comprises:

An extrusion device configured to extrude plastic from the die of the extrusion device;

A cooling water tank is arranged under the machine head to receive and cool the plastic;

The water curtain generating assembly is configured to generate a water curtain whose water flow direction is consistent with the moving direction of the plastic from below the plastic outlet of the machine head, so that when the plastic material is broken, the water curtain can cool the material and the water The curtain overlaps the broken material to the plastic that is normally towed.
A plastic extrusion method, characterized in that the following operations are performed using the plastic extrusion system of claim 24:

Start the extrusion device and start extruding plastic;

The water curtain generating assembly is activated, and a water curtain whose water flow direction is consistent with the moving direction of the plastic is generated from below the plastic outlet of the machine head, so that when the plastic material is broken, the water curtain can cool the material, and the The water curtain overlaps the broken material to the plastic that is normally towed;

The cooling water tank receives and cools the plastic below the plastic outlet.