WO2021051644A1

WO2021051644A1 - Crawler-type mixing apparatus for long fiber reinforced thermoplastic composite material

Info

Publication number: WO2021051644A1
Application number: PCT/CN2019/120520
Authority: WO
Inventors: 管印贵; 管志广; 徐光磊; 时艳玲; 袁杰; 姜恭俭
Original assignee: 山东格瑞德集团有限公司
Priority date: 2019-09-17
Filing date: 2019-11-25
Publication date: 2021-03-25
Also published as: CN110450309A

Abstract

Provided is a crawler-type mixing apparatus for a long fiber reinforced thermoplastic composite material, the mixing apparatus comprising: a housing (1), a feeding port and a discharging port being respectively provided in two opposite side walls of the housing (1); and two crawler mechanisms distributed in parallel. The crawler mechanism is installed and fixed in the housing (1), a channel (15) for conveying a mixture (23) is formed between the two crawler mechanisms, protrusions (24) for extruding the mixture (23) in the channel (15) are provided on surfaces of crawler belts (14) of the crawler mechanisms, a closed structure is formed between edges of two sides of the channel (15), respectively and an inner wall of the housing (1), and openings of a feeding end and a discharging end of the channel (15) respectively correspond to the feeding port and the discharging port on a one-to-one basis and are in communication with the feeding port and the discharging port; and fiber yarn is cut off in a fixed-length manner by means of a roller cutting machine, is only mixed with thermoplastic resin preliminarily and is extruded in the mixing apparatus by means of the protrusions (24) of a wavy structure on an outer wall of the crawler belt, guaranteeing sufficient mixing of blanks, and also reducing shearing abrasion on fibers, such that the mechanical property of a product is remarkably improved.

Description

Long fiber reinforced thermoplastic composite material crawler mixing equipment

Technical field

The invention relates to the technical field of composite material equipment, in particular to a long-fiber reinforced thermoplastic composite material crawler-type mixing equipment.

Background technique

Fiber-reinforced thermoplastic composite materials are widely used in automobiles, electrical appliances, rail transit, construction industry, civil, light industry and other fields due to their light weight, high strength, environmental protection and recyclability.

The mixing process of fiber and thermoplastic resin is an important part of determining the properties of thermoplastic composites. At present, the more mature mixing equipment includes the D-LFT production line of Coperion W&P in Germany and the LFT-D-ILC of Dieffenbacher in Germany. production line. In the above production line, the cutting and dispersion of fibers and the mixing of fibers and thermoplastic resins are all carried out in the screw extruder. In order to achieve a better mixing effect, the fiber inlet is usually set at the front end of the extruder and undergoes a long screw shear. During the cutting and mixing process, the resulting problem is that the screw has a significant shearing effect on the fiber. Generally, the actual fiber length is 5-10mm, which is much smaller than the design length of the fiber 15-25mm, resulting in a significant reduction in the performance of the product.

Summary of the invention

In order to solve the deficiencies in the prior art, the purpose of the present invention is to provide a long-fiber reinforced thermoplastic composite material crawler-type mixing equipment, which can be used for effective mixing of fibers with a length of 15-25 mm and thermoplastic resin.

The technical solutions adopted by the present invention to solve its technical problems are:

A long-fiber-reinforced thermoplastic composite material crawler-type mixing equipment, which is characterized in that it comprises:

A housing, two opposite side walls of the housing are respectively provided with a feed port and a discharge port; and

Two sets of parallelly distributed crawler mechanisms are installed and fixed inside the casing. The two sets of crawler mechanisms form a channel for conveying the mixed material. The crawler surface of the crawler mechanism is provided for mixing the mixed material in the channel. The squeezing protrusions form a closed structure between the edges on both sides of the channel and the inner wall of the shell. The openings of the feeding end and the outlet end of the channel are respectively arranged in a one-to-one correspondence with the inlet and outlet and mutually correspond to each other. Connected.

It also includes a feeding die. The feeding die is mounted on the side wall of the housing and the feed side of the feed die is in communication with the feed port. The discharge side of the feed die is in communication with the channel. The opening length of the discharge side of the die is set equal to or slightly less than the opening length of the channel.

It also includes a discharging die. The discharging die is installed on the side wall of the shell and its discharging side is in communication with the discharging port. The feeding side of the discharging die is in communication with the channel, and the discharging die is in communication with the channel. The opening length of the feed side of the die is set equal to or slightly larger than the opening length of the channel.

The crawler mechanism includes a crawler belt, a support body and a driving roller. The support body has a smooth surface and both ends are arc surfaces. The crawler belt is wrapped around the support body and its two end surfaces and is slidably arranged between the two The driving roller is located outside the side of the crawler mechanism away from the passage, and is connected to the crawler in transmission.

The two end surfaces of the driving roller and the two side edge surfaces of the crawler belt are respectively provided with transmission teeth with matching shapes, and the driving roller and the crawler belt are meshed and connected by the transmission teeth.

The driving teeth of the crawler belt are arranged higher than the protrusions of the crawler belt.

The two sides of the support body are respectively provided with mounting holes and are connected and fixed with the side wall of the housing by bolts.

The two ends of the driving roller are respectively rotatably connected with the side wall of the casing, and the rotating shaft of at least one end of the driving roller is exposed to the casing.

The protrusions have a linear structure and are evenly distributed on the surface of the crawler belt. The two ends of the protrusions are respectively aligned with the edges on both sides of the crawler belt or the transmission teeth on both sides of the crawler belt, and the protrusions are distributed in parallel.

The length direction of the protrusion is perpendicular to the sliding direction of the crawler belt.

The cross-section of the protrusion is arc-shaped, and the angle between the two arc sides of the arc-shaped cross-section and the surface of the track is 45-60 degrees.

The speed difference of the crawler belt movement of the two groups of crawler belt mechanisms is 0.5-2.0 m/min.

The support body is made of heat-conducting material and is provided with a heating channel, and the surface of the support body is also provided with a liquid inlet and a liquid outlet communicating with the heating channel.

The liquid inlet is arranged close to the inlet side of the channel, and the liquid outlet is arranged close to the outlet side of the channel.

The support body is made of heat-conducting material and is provided with a trough body, and an electric heating device is arranged in the trough body.

It also includes a scraper located inside the shell. The scraper is arranged between the crawler and the discharge die. Both ends of the scraper are rotatably connected with the side wall of the shell, and the scraper is rotatably connected to the side wall of the shell. The rotating shaft of at least one end of the hopper is arranged to expose the casing.

It also includes a screw feeder. The discharge side of the screw feeder is fixedly connected with the feeding die and communicated with each other. The upper end of the screw feeder is provided with a fiber feeding port for feeding fibers. .

The fiber is fed into the inside of the fiber feed port after being cut to length by a roll cutter.

It also includes a traction and flattening roller, the traction and flattening roller is arranged outside the discharge port of the shell, and the mixed material is drawn out from the discharge port after passing through the traction and flattening roller.

The beneficial effects of the present invention are:

The fiber inlet is set at the end of the feeder, and the fiber yarn is cut to a fixed length by a roller cutter, and only initially mixed with the thermoplastic resin to ensure that the fiber retention length is 15-25mm; inside the mixing device, it is carried out by the wavy structure of the outer wall of the crawler. Extrusion not only ensures the full mixing of the blanks, but also reduces the shear wear on the fibers, so that the mechanical properties of the product have a significant improvement effect.

Description of the drawings

The present invention will be further described below in conjunction with the drawings and embodiments.

Fig. 1 is a schematic diagram of the front structure of the present invention (non-screw feeder and traction and flattening roller).

Figure 2 is a schematic diagram of the left side structure of the present invention (non-screw feeder and traction and flattening roller).

FIG. 3 is a schematic diagram of the front cross-sectional structure of the present invention.

Figure 4 is a schematic side view of the cross-sectional structure of the present invention (non-screw feeder and traction and flattening roller).

Figure 5 is a schematic diagram of the inner side structure of the feeding die.

Figure 6 is a schematic diagram of the outer side structure of the feeding die.

Figure 7 is a schematic diagram of the side structure of the feeding die.

Fig. 8 is a schematic diagram of the inner side structure of the discharging die.

Fig. 9 is a schematic diagram showing the structure of the outer side of the discharging die.

Fig. 10 is a schematic diagram of a side view of the side structure of the discharging die.

Figure 11 is a schematic diagram of the structure of the crawler.

Fig. 12 is a schematic cross-sectional structure view of "A-A" in Fig. 11.

Fig. 13 is a schematic cross-sectional structure diagram of "B-B" in Fig. 11.

Fig. 14 is a partial enlarged schematic diagram of "C" in Fig. 12.

In the picture: 1 housing, 2 first drive roller, 3 first geared motor, 4 third geared motor, 5 scraper, 6 liquid inlet, 7 second drive roller, 8 second geared motor, 9 liquid out Port, 10 screw feeder, 11 thermoplastic resin feeding port, 12 support body, 13 heating channel, 14 crawler belt, 15 channel, 16 transmission gear, 17 fiber feeding port, 18 roller cutter, 19 fiber, 20 feeding die Head, 21 discharge die, 22 traction and flattening roller, 23 mixture, 24 protrusion.

detailed description

The following specific examples illustrate the implementation of the present invention. Those familiar with this technology can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

As shown in Figure 1 to Figure 13: this embodiment provides a long fiber reinforced thermoplastic composite material crawler mixing equipment, including a shell 1, a crawler mechanism, a feeding die 20, a discharging die 21, etc., mainly through Each component provides a device that can transport the mixture 23 through the crawler and realize the full mixing of the fiber and the thermoplastic resin;

The housing 1 includes a top panel, a bottom panel, a front panel, a rear panel, a left panel, and a right panel. The panels are connected to each other to form a closed structure. The left panel of the housing 1 is provided with a feed port. The right panel of 1 is provided with a discharge port. The height of the feed port and the discharge port are set to be the same. The shape of the feed port is slightly larger than the size of the discharge port of the screw feeder 10 to facilitate the screw feeder 10 and the shell. The internal components of the body 1 are assembled, and the discharge port has a flat structure, which matches the discharge shape of the mixed material 23, and is used for the mixed material 23 to leave the housing 1;

The crawler mechanism includes two groups distributed in parallel. The crawler mechanisms are installed horizontally and fixed inside the housing 1 respectively. Between the two groups of crawler mechanisms, a channel 15 for conveying the mixture 23 is formed. The edges on both sides of the channel 15 are connected to the shell respectively. A closed structure is formed between the inner walls of the body 1, and the crawler mechanism includes a crawler 14, a supporting body 12, a first driving roller 2 and a second driving roller 7, wherein:

The support body 12 is made of a metal material with good thermal conductivity, and its surface is smooth and its ends are semi-circular arc surfaces, which is conducive to the smooth sliding of the crawler belt 14 on its surface. The support body 12 has a hollow structure in the middle, which supports The front and rear sides of the body 12 are both open, so that the entire body forms a ring shape, which reduces the overall mass of the support body 12. Both sides of the support body 12 are connected and fixed with the side walls of the housing 1 by bolts, so that the support body 12 Fixed position inside the housing 1;

Further, the support body 12 is provided with a heating channel 13 inside, and the surface of the support body 12 is also provided with a liquid inlet 6 and a liquid outlet 9 communicating with the heating channel 13, and the liquid inlet 6 is close to the channel 15. The liquid outlet 9 is set close to the outlet side of the channel 15, so that the heating oil gradually approaches the front side of the channel 15 during the transportation of the liquid inlet 6 to the liquid outlet 9, and the high temperature heating oil can protect The heating temperature of the mixture 23, and the low-temperature heating oil can ensure the heat preservation and conveying effect of the mixture 23;

The heating channel 13 is distributed on the side close to the channel 15 and is used for heating and heat preservation and transportation of the mixture 23 in the channel 15. The external oil heating device circulates the thermal circulating oil in the heating channel 13 to realize the support body 12 Continuous heating effect;

On the outer surface of the crawler belt 14, integrated transmission teeth 16 are machined on the edges of both sides of the crawler belt 14. In the middle of the crawler belt 14, there are integrated projections 24. The projections 24 are located between the transmission teeth 16. The ridges 24 have a linear structure and are evenly distributed on the surface of the crawler belt 14. The two ends of the protrusions 24 are arranged in alignment with the inner end surfaces of the transmission teeth 16 respectively. The ridges 24 are distributed in parallel to form a wave-like structure, so that the length direction of the protrusions 24 is the same as that of the crawler belt 14. The sliding direction is vertically distributed, that is, during the sliding process of the crawler belt 14, the mixture 23 can be squeezed through the protrusions 24, so that the fibers 19 and the thermoplastic resin are fully mixed;

Further, the cross section of the protrusion 24 is arc-shaped, and the angle (∠A and ∠B) between the two arc side sides of the arc-shaped cross-section and the surface of the track 14 is 15-60 degrees, that is, the protrusion 24 The surface is also relatively smooth, which can avoid the unevenness of the surface of the mixture 23 when the edges and corners of the protrusions 24 contact the mixture 23 while squeezing the mixture 23, and also reduce the shear wear on the fiber 19;

Furthermore, the difference in the moving speed of the crawlers 14 of the two groups of crawler mechanisms is 0.5-2.0 m/min, that is, the crawlers 14 of the two groups of crawler mechanisms move slowly and the other is fast, and the protrusions 24 of the two crawler belts 14 Under the premise of the inconsistency of the movement speed, it will also form the relationship of mutual alternation position, thereby changing the static contact effect of the protrusion 24 on the mixture 23 into a dynamic contact effect, that is, the two protrusions 24 that are relatively close to the two crawlers 14 The distance between them is first gradually reduced to overlap, and then gradually expanded until the two protrusions 24 overlap with the next protrusion 24 respectively. In this way, the extrusion effect of the mixture 23 can be improved;

The first driving roller 2 and the second driving roller 7 are respectively located outside the side of the crawler mechanism away from the channel 15, the first driving roller 2 is located at the upper part, the second driving roller 7 is located at the lower part, and the first driving roller 2 and the second driving roller 2 are located at the bottom. Both sides of the surface of the two driving rollers 7 are respectively processed with transmission teeth 16 integrated with them. The transmission teeth 16 match the shape of the transmission teeth 16 of the crawler belt 14 and are connected to each other for power transmission, and are used to drive the crawler belt through the drive rollers. 14 for sliding, the rotating shafts at one end of the first driving roller 2 and the second driving roller 7 extend out of the housing 1 and are assembled and fixed with a transmission wheel. At the same time, the transmission wheel is connected to the first reduction motor 3 and the second reduction motor respectively. The motor 8 is connected by a transmission belt. The first geared motor 3 is installed and fixed on the top of the housing 1, and the second geared motor 8 is installed in the frame structure at the bottom of the housing 1. By starting the first geared motor 3 and the second geared motor 8, you can Drive the first drive roller 2 and the second drive roller 7 and the corresponding crawler belt 14 to rotate. When the crawler belts 14 of the two groups of crawler mechanisms rotate at the same time, the conveying of the mixed material 23 can be realized, so that the upper part of the mixed material 23 and The lower surface is simultaneously subjected to the conveying effect of the crawler belt 14. During the conveying process, the mixture 23 is squeezed through the protrusions 24 on the surface of the crawler belt 14 to mix the mixture 23;

Further, the long-fiber reinforced thermoplastic composite material crawler-type mixing equipment also includes a feeding die 20 and a discharging die 21, wherein:

The feeding die 20 is installed on the inner wall of the panel as the housing 1 and its feeding side is in communication with the feeding port. The feeding side of the feeding die 20 is in communication with the channel 15, and the feeding die 20 The length of the opening on the discharge side is equal to the length of the opening of the channel 15. The feeding die 20 is used to output the mixture of the specified cross-sectional shape, so that the mixture 23 of the feeding die 20 can be evenly fed into the opening of the entire channel 15 , To ensure the accuracy of feeding;

The discharging die 21 is installed on the inner wall of the right panel of the housing 1 and its discharging side is in communication with the discharging port, the feeding side of the discharging die 21 is in communication with the channel 15, and the discharging die 21 The length of the opening on the feed side is slightly longer than the opening length of the channel 15, so that the mixture 23 can enter the discharge die 21. At the same time, the mixture 23 output by the discharge die 21 is also flat, but it only guides and guides the mixture. The shaping effect guarantees the output quality of the mixture.

Furthermore, the long-fiber reinforced thermoplastic composite material crawler-type mixing equipment also includes a scraper 5 located inside the casing 1, and the scraper 5 is arranged on both the crawler 14 and the discharge die 21. Between the two sides, the two ends of the scraper 5 are respectively rotatably connected with the side wall of the casing 1, and the rotating shaft at one end of the scraper 5 is exposed to the casing 1 and is assembled and fixed with a transmission wheel. At the same time, the transmission wheel Two sets of third gear motors 4 corresponding to one-to-one are connected by transmission belts, which are used to synchronously drive the two groups of scrapers 5 to rotate, and the rotation direction of the scrapers 5 is opposite to the rotation direction of the corresponding crawler belt 14. A radially distributed scraper is provided on the outer side wall of the scraper 5. The scraper is a rubber plate and is distributed along the axial direction of the scraper 5. It is used for the mixture that will adhere to the surface of the crawler 14 when the surface of the crawler 14 is in contact. 23 is scraped down, so that the mixed material 23 is located inside the channel 15 and enters the discharge die 21. The setting of the scraper 5 can ensure the conveying effect of the mixed material 23, so that the mixed material 23 will not stick to the surface of the crawler belt 14. No cleaning up of accumulated materials, reducing labor costs;

Further, the long-fiber reinforced thermoplastic composite material crawler mixing equipment also includes a roll cutter 18, a screw feeder 10, and a traction and flattening roll 22. The roll cutter 18, a screw feeder 10 and a traction and flattening roll 22 are separate Set up and cooperate with the long-fiber reinforced thermoplastic composite material crawler-type mixing equipment, specifically:

The discharge side of the screw feeder 10 is fixedly connected with the feeding die 20 and communicated with each other. The front end of the screw feeder 10 is provided with a thermoplastic resin feeding port 11, and the end of the screw feeder 10 The upper part is provided with a fiber feeding port 17 for feeding the fiber 19, and the fiber 19 is cut from the upper part of the fiber feeding port 17 by a roll cutter 18 and fed into the inside. The fiber 19 is glass fiber, carbon fiber, basalt fiber, etc. , The length of the fiber 19 is 15-25mm, the thermoplastic resin is polypropylene, polyethylene, polyamide, etc., the traction and flattening roller 22 is arranged outside the discharge port of the housing 1, and the mixture 23 is from the discharge port Lead out after traction and flattening roller 22;

In the above structure, the position of the fiber feed port 17 is mainly used to feed the fiber 19 into the thermoplastic resin in the molten state, while avoiding the screw feeder 10 from performing excessive stirring and conveying effects on the fiber, thereby reducing the damage effect on the fiber 19. The length of the fiber 19 is guaranteed. The thermoplastic blank produced by this equipment is evenly mixed. The fiber length is 15-25mm, the fiber content is 30-50%, and the thickness is 3-10mm. The blank can be directly sent to the press for molding production or can be stored After the second use.

The above are only the preferred implementation manners of the present invention, and as long as the objective technical solutions of the present invention are achieved by basically the same means, they all fall within the protection scope of the present invention.

Claims

A long-fiber-reinforced thermoplastic composite material crawler-type mixing equipment, which is characterized in that it comprises:

A housing, two opposite side walls of the housing are respectively provided with a feed port and a discharge port; and

Two sets of parallelly distributed crawler mechanisms are installed and fixed inside the casing. The two sets of crawler mechanisms form a channel for conveying the mixed material. The crawler surface of the crawler mechanism is provided for mixing the mixed material in the channel. The squeezing protrusions form a closed structure between the edges on both sides of the channel and the inner wall of the shell. The openings of the feeding end and the outlet end of the channel are respectively arranged in a one-to-one correspondence with the inlet and outlet and mutually correspond to each other. Connected.
The long-fiber reinforced thermoplastic composite material crawler mixing equipment according to claim 1, characterized in that it further comprises a feeding die, the feeding die is installed on the side wall of the housing and the feeding side It is connected with the feeding port, the discharge side of the feeding die is connected with the channel, and the opening length of the feeding side of the feeding die is set to be equal to or slightly less than the opening length of the channel.
The long-fiber reinforced thermoplastic composite material crawler-type mixing equipment according to claim 1, characterized in that it further comprises a discharging die, the discharging die is installed on the side wall of the shell and its discharge side It is connected with the discharge port, the feed side of the discharge die is communicated with the channel, and the opening length of the feed side of the discharge die is set equal to or slightly larger than the opening length of the channel.
The long-fiber reinforced thermoplastic composite material crawler-type mixing equipment according to claim 1, wherein the crawler mechanism includes a crawler, a support body and a driving roller, and the support body has a smooth surface and both ends of which are arcs. On the other hand, the crawler is wrapped on the outside of the support body and its two end surfaces and slidably arranged between the two, and the driving roller is located outside the side of the crawler mechanism away from the passage, and is connected to the crawler in transmission.
The long-fiber reinforced thermoplastic composite material crawler-type mixing equipment according to claim 4, characterized in that: the two end surfaces of the driving roller and the two side edge surfaces of the crawler are respectively provided with transmission teeth with matching shapes, and the driving roller And the crawler belt is meshed and connected by transmission teeth.
A long-fiber reinforced thermoplastic composite material crawler-type mixing device according to claim 5, wherein the driving teeth of the crawler belt are arranged higher than the protrusions of the crawler belt.
The long-fiber-reinforced thermoplastic composite material crawler-type mixing equipment according to claim 4, characterized in that: the two sides of the support body are respectively provided with mounting holes and are connected and fixed with the side wall of the shell by bolts.
The long-fiber-reinforced thermoplastic composite material crawler-type mixing equipment according to claim 4, wherein the two ends of the driving roller are rotatably connected with the side wall of the housing, and the rotating shaft of at least one end of the driving roller Expose the housing setting.
The long-fiber-reinforced thermoplastic composite material crawler-type mixing equipment according to claim 1, characterized in that: the protrusions have a linear structure and are evenly distributed on the surface of the crawler, and the two ends of the protrusions are respectively connected with the edges on both sides of the crawler or the crawler. The transmission teeth on both sides are aligned, and the protrusions are distributed in parallel.
The long-fiber-reinforced thermoplastic composite material crawler-type mixing equipment according to claim 1, wherein the length direction of the protrusion is perpendicular to the sliding direction of the crawler.
The long-fiber-reinforced thermoplastic composite material crawler-type mixing equipment according to claim 1, wherein the convex cross-section is arc-shaped, and the two arc sides of the arc-shaped cross-section are in contact with the surface of the crawler. The included angle is 45-60 degrees.
The long-fiber reinforced thermoplastic composite material crawler-type mixing equipment according to claim 1, characterized in that the speed difference of the crawler movement of the two groups of crawler mechanisms is 0.5-2.0 m/min.
A long-fiber reinforced thermoplastic composite material crawler-type mixing equipment according to claim 4, characterized in that: the support body is made of heat-conducting material and has a heating channel inside, and the surface of the support body is also provided with the heating The liquid inlet and the liquid outlet connected by the channel.
The long-fiber reinforced thermoplastic composite material crawler mixing equipment according to claim 13, wherein the liquid inlet is arranged close to the inlet side of the channel, and the liquid outlet is arranged close to the outlet side of the channel.
The long-fiber reinforced thermoplastic composite material crawler-type mixing equipment according to claim 4, characterized in that: the support body is made of heat-conducting material and is provided with a trough in the trough, and an electric heating device is provided in the trough.
The long-fiber reinforced thermoplastic composite material crawler-type mixing equipment according to claim 1, characterized in that it further comprises a scraper located inside the shell, and the scraper is arranged on the crawler and the discharge die. Between the heads, two ends of the scraper are respectively rotatably connected with the side wall of the casing, and the rotating shaft of at least one end of the scraper is arranged to expose the casing.
The long-fiber reinforced thermoplastic composite material crawler mixing equipment according to claim 2, characterized in that it further comprises a screw feeder, and the discharge side of the screw feeder is connected and fixed with the feeding die. They are in communication with each other, and the upper end of the screw feeder is provided with a fiber feeding port for feeding fibers.
The long-fiber-reinforced thermoplastic composite material crawler-type mixing equipment according to claim 17, wherein the fibers are fed into the interior after being cut to length by a roll cutter from the upper part of the fiber feed port.
The long-fiber-reinforced thermoplastic composite material crawler-type mixing equipment according to claim 1, characterized in that it further comprises a traction and flattening roller, the traction and flattening roller is arranged outside the discharge port of the shell, and the mixing The material is drawn out after passing through the traction and flattening roller from the discharge port.