Tracked mixing equipment for long fiber reinforced thermoplastic composites

Abstract

The invention relates to a long fiber reinforced thermoplastic composite crawler type mixing equipment, comprising: a shell, two opposite side walls of the shell are respectively provided with a feed port and a discharge port; and two groups of crawler mechanisms distributed in parallel, the crawler mechanisms are installed and fixed inside the shell, a channel for conveying a mixed material is formed between the two groups of crawler mechanisms, a crawler surface of the crawler mechanism is provided with a protrusion for extruding the mixed material in the channel, the edges on both sides of the channel respectively form a closed structure with the inner wall of the shell, the openings of the feed end and the discharge end of the channel are respectively arranged in one-to-one correspondence with the feed port and the discharge port and are connected to each other; the fiber yarn of the invention is cut to a fixed length by a roller cutter, is only preliminarily mixed with a thermoplastic resin, and is extruded inside the mixing equipment through the protrusions of the corrugated structure of the outer wall of the crawler, which not only ensures the full mixing of the blank, but also reduces the shear wear on the fiber, so that the mechanical properties of the product are significantly improved.

Description

Technical Field

[0001] 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 Art

[0002] Fiber-reinforced thermoplastic composites are widely used in the automotive, electrical, rail transit, construction, civil and light industrial fields due to their excellent characteristics such as light weight, high strength, environmental protection and recyclability.

[0003] The mixing process of fiber and thermoplastic resin is an important link in determining the performance of thermoplastic composite materials. Currently, the more mature mixing equipment includes the D-LFT production line of Coperion W&P of Germany and the LFT-D-ILC production line of Dieffenbacher of Germany. In the above production lines, the cutting, dispersion and mixing of fiber and thermoplastic resin 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 it undergoes a very long screw shearing and mixing process. The resulting problem is that the screw has a significant shearing effect on the fiber. Generally, the actual length of the fiber is 5-10mm, which is much smaller than the designed fiber length of 15-25mm, resulting in a significant reduction in the performance of the product. Summary of the invention

[0004] In order to solve the deficiencies in the prior art, the object of the present invention is to provide a long fiber reinforced thermoplastic composite crawler type mixing equipment, which can be used for effectively mixing fibers with a length of 15-25 mm and thermoplastic resin.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] A long fiber reinforced thermoplastic composite crawler type mixing equipment, characterized by comprising:

[0007] A shell, wherein two opposite side walls of the shell are respectively provided with a feed inlet and a discharge outlet; and

[0008] Two sets of crawler mechanisms are distributed in parallel, and the crawler mechanisms are installed and fixed inside the shell. A channel for conveying the mixture is formed between the two sets of crawler mechanisms. The crawler surface of the crawler mechanism is provided with a protrusion for extruding the mixture in the channel. The edges on both sides of the channel form a closed structure with the inner wall of the shell respectively. The openings at the feed end and the discharge end of the channel are respectively arranged in one-to-one correspondence with the feed port and the discharge port and are connected to each other.

[0009] It also includes a feeding die, which is installed on the side wall of the shell and has a feeding side connected to the feeding port, a discharging side connected to the channel, and an opening length of the discharging side of the feeding die is equal to or slightly smaller than the opening length of the channel.

[0010] It also includes a discharge die head, which is installed on the side wall of the shell and its discharge side is connected to the discharge port, the feed side of the discharge die head is connected to the channel, and the opening length of the feed side of the discharge die head is equal to or slightly larger than the opening length of the channel.

[0011] The crawler mechanism includes a crawler, a support body and a driving roller. The surface of the support body is smooth and its two ends are arc surfaces. The crawler is wrapped around the outside of 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 channel and is connected to the crawler transmission.

[0012] Transmission teeth with matching shapes are respectively arranged on the surfaces at both ends of the driving roller and the edge surfaces at both sides of the crawler, and the driving roller and the crawler are meshed and connected via the transmission teeth.

[0013] The driving teeth of the crawler belt are arranged higher than the protrusions of the crawler belt.

[0014] The support body is provided with mounting holes on both sides and is connected and fixed to the side wall of the shell by bolts.

[0015] The two ends of the driving roller are respectively rotatably connected to the side walls of the shell, and the rotating shaft of at least one end of the driving roller is exposed from the shell.

[0016] The protrusions are linear structures and are evenly distributed on the surface of the track. The two ends of the protrusions are respectively aligned with the edges of the two sides of the track or the transmission teeth on the two sides of the track, and the protrusions are distributed in parallel.

[0017] The length direction of the protrusion is perpendicular to the sliding direction of the crawler track.

[0018] 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 track surface is 45-60 degrees.

[0019] The speed difference of the crawler tracks of the two sets of crawler track mechanisms is 0.5-2.0 m / min.

[0020] The support body is made of heat-conducting material and is provided with a heating channel inside. A liquid inlet and a liquid outlet communicating with the heating channel are also provided on the surface of the support body.

[0021] 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.

[0022] The support body is made of heat-conducting material and has a groove inside, and an electric heating device is arranged inside the groove.

[0023] It also includes a scraper located inside the shell, the scraper is arranged between the crawler and the discharge die head, the two ends of the scraper are respectively rotatably connected to the side walls of the shell, and the rotating shaft of at least one end of the scraper is exposed from the shell.

[0024] A screw feeder is also included, the discharge side of the screw feeder is fixedly connected to the feeding die head and the two are interconnected, and a fiber feeding port for feeding fibers is provided at the upper end of the screw feeder.

[0025] The fibers are cut to a fixed length by a roller cutter from the upper part of the fiber feeding port and then fed into the interior.

[0026] It also includes a traction and flattening roller, which is arranged outside the discharge port of the shell, and the mixed material is led out from the discharge port after passing through the traction and flattening roller.

[0027] The beneficial effects of the present invention are:

[0028] 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. It is only preliminarily mixed with the thermoplastic resin to ensure that the fiber retention length is 15~25mm. The convex wavy structure of the outer wall of the crawler is used to extrude the blank inside the mixing equipment, which not only ensures the full mixing of the blank, but also reduces the shear wear on the fiber, so that the mechanical properties of the product are significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0030] Figure 1 This is a schematic diagram of the main structure of the present invention (without a screw feeder and a traction flattening roller).

[0031] Figure 2 It is a schematic diagram of the left structure of the present invention (without screw feeder and traction flattening roller).

[0032] Figure 3 It is a schematic diagram of the main cross-sectional structure of the present invention.

[0033] Figure 4 It is a schematic diagram of the side cross-sectional structure of the present invention (without a screw feeder and a traction flattening roller).

[0034] Figure 5 It is a schematic diagram of the inner side structure of the feeding die head.

[0035] Figure 6 It is a schematic diagram of the outer side structure of the feeding die head.

[0036] Figure 7 It is a schematic diagram of the side structure of the feeding die head.

[0037] Figure 8It is a schematic diagram of the inner side structure of the discharge die head.

[0038] Fig. 9 It is a schematic diagram of the outer side structure of the discharge die head.

[0039] Fig.10 It is a schematic diagram of the side structure of the discharge die head.

[0040] Fig.11 This is a schematic diagram of the crawler structure.

[0041] Fig.12 for Fig.11 Schematic diagram of the cross-sectional structure of “AA”.

[0042] Fig.13 for Fig.11 Schematic diagram of the cross-sectional structure of "BB".

[0043] Fig.14 for Fig.12 Schematic diagram of the partial enlarged structure of "C".

[0044] In the figure: 1 shell, 2 first drive roller, 3 first reduction motor, 4 third reduction motor, 5 scraper, 6 liquid inlet, 7 second drive roller, 8 second reduction motor, 9 liquid outlet, 10 screw feeder, 11 thermoplastic resin feeding port, 12 support body, 13 heating channel, 14 crawler, 15 channel, 16 transmission gear, 17 fiber feeding port, 18 roller cutter, 19 fiber, 20 feeding die, 21 discharging die, 22 traction flattening roller, 23 mixture, 24 protrusion. DETAILED DESCRIPTION

[0045] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0046] like Figures 1 to 13 As shown: This embodiment provides a long fiber reinforced thermoplastic composite crawler type mixing device, including a housing 1, a crawler mechanism, a feeding die 20, a discharging die 21, etc., mainly through each component to provide a device that can convey the mixed material 23 through the crawler and achieve full mixing of the fiber and the thermoplastic resin;

[0047] The shell 1 includes a top panel, a bottom panel, a front panel, a rear panel, a left panel and a right panel, and the panels are interconnected to form a closed structure. A feed port is provided on the left panel of the shell 1, and a discharge port is provided on the right panel of the shell 1. The feed port and the discharge port are arranged at the same height, wherein the shape of the feed port is slightly larger than the size of the discharge port of the screw feeder 10, so as to facilitate the assembly of the screw feeder 10 with the internal components of the shell 1, and the discharge port is a flat structure, which matches the discharge shape of the mixed material 23, and is used for the mixed material 23 to leave the shell 1 for use;

[0048] The crawler mechanism includes two groups of parallel distribution, and the crawler mechanisms are respectively installed horizontally and fixed inside the shell 1. A channel 15 for conveying the mixture 23 is formed between the two groups of crawler mechanisms, and the edges on both sides of the channel 15 respectively form a closed structure with the inner wall of the shell 1. The crawler mechanism includes a crawler 14, a support body 12, a first driving roller 2 and a second driving roller 7, wherein:

[0049] The support body 12 is made of a metal material with good heat conduction effect, and its surface is smooth and its two ends are semicircular arc surfaces, which are conducive to the smooth sliding of the crawler 14 on its surface. The middle part of the support body 12 is a hollow structure, and the front and rear sides of the support body 12 are open, so that the whole body forms a ring shape, which reduces the overall mass of the support body 12. The two sides of the support body 12 are respectively connected and fixed to the side walls of the shell 1 by bolts, so that the position of the support body 12 inside the shell 1 is fixed;

[0050] Furthermore, a heating channel 13 is provided inside the support body 12, and a liquid inlet 6 and a liquid outlet 9 connected to the heating channel 13 are also provided on the surface of the support body 12. The liquid inlet 6 is arranged close to the inlet side of the channel 15, and the liquid outlet 9 is arranged 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 process from the liquid inlet 6 to the liquid outlet 9. The heating oil with a high temperature can ensure the heating temperature of the mixture 23, and the heating oil with a low temperature can ensure the heat preservation and transportation effect of the mixture 23;

[0051] The heating channel 13 is located near the channel 15 and is used to heat and heat the mixed material 23 in the channel 15. The hot circulating oil is circulated in the heating channel 13 by an external oil heating device, thereby achieving a continuous heating effect of the support body 12.

[0052] On the outer surface of the crawler 14, transmission teeth 16 of an integral structure are processed on the edges of both sides of the crawler 14, and a protrusion 24 of an integral structure is processed in the middle of the crawler 14. The protrusion 24 is located between the transmission teeth 16. The protrusion 24 is a linear structure and is evenly distributed on the surface of the crawler 14. The two ends of the protrusion 24 are aligned with the inner end faces of the transmission teeth 16, and the protrusions 24 are parallelly distributed to form a wavy structure, so that the length direction of the protrusion 24 is perpendicular to the sliding direction of the crawler 14, that is, during the sliding process of the crawler 14, the mixed material 23 can be squeezed through the protrusion 24, so that the fiber 19 and the thermoplastic resin are fully mixed;

[0053] Furthermore, the cross section of the protrusion 24 is arc-shaped, and the angles (∠A and ∠B) between the two arc sides of the arc-shaped cross section and the surface of the crawler 14 are 15-60 degrees, that is, the surface of the protrusion 24 is relatively smooth, and when the mixture 23 is extruded, the edges and corners of the protrusion 24 can be prevented from causing unevenness on the surface of the mixture 23 when contacting the mixture 23, and the shear wear on the fiber 19 can be reduced;

[0054] Furthermore, the speed difference of the crawlers 14 of the two sets of crawler mechanisms is 0.5-2.0 m / min, that is, the crawlers 14 of the two sets of crawler mechanisms are one slow and the other fast during the movement process, and the protrusions 24 of the two crawlers 14 will also form a changing relationship of alternating positions under the premise of inconsistent movement speeds, thereby changing the static contact effect of the protrusions 24 on the mixture 23 into a dynamic contact effect, that is, the spacing between the two relatively close protrusions 24 of the two crawlers 14 is first gradually reduced to overlap, and then gradually expanded to the point where the two protrusions 24 overlap with the next protrusion 24, respectively, so that the extrusion effect on the mixture 23 can be improved;

[0055] 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, and the second driving roller 7 is located at the lower part. The first driving roller 2 and the second driving roller 7 are respectively processed with transmission teeth 16 of an integral structure therewith on both sides of the surface. The transmission teeth 16 match the transmission teeth 16 of the crawler 14 in shape and are meshed and connected with each other for power transmission, and are used to drive the crawler 14 to slide through the driving rollers. The rotating shafts of the first driving roller 2 and the second driving roller 7 at one end of the housing 1 are extended out of the housing 1 and are assembled and fixed with a transmission wheel. At the same time, the transmission wheels are respectively connected with the first reduction motor 3. , the second reduction motor 8 is connected through a transmission belt, the first reduction motor 3 is fixedly mounted on the top of the housing 1, and the second reduction motor 8 is mounted in the frame structure at the bottom of the housing 1. By starting the first reduction motor 3 and the second reduction motor 8, the first driving roller 2 and the second driving roller 7 and the corresponding crawler 14 can be driven to rotate. When the crawlers 14 of the two sets of crawler mechanisms rotate at the same time, the mixture 23 can be conveyed, and the upper and lower surfaces of the mixture 23 are simultaneously affected by the conveying effect of the crawler 14. During the conveying process, the mixture 23 is squeezed by the protrusions 24 on the surface of the crawler 14 to mix the mixture 23;

[0056] Furthermore, the long fiber reinforced thermoplastic composite crawler type mixing equipment also includes a feeding die 20 and a discharging die 21, wherein:

[0057] The feeding die head 20 is installed on the inner wall of the panel of the housing 1 and its feeding side is connected to the feeding port, and the discharging side of the feeding die head 20 is connected to the channel 15. The opening length of the discharging side of the feeding die head 20 is equal to the opening length of the channel 15. The feeding die head 20 is used to output the mixed material of the specified cross-sectional shape, so that the mixed material 23 of the feeding die head 20 can be evenly fed into the opening of the entire channel 15 to ensure the accuracy of feeding;

[0058] The discharge die head 21 is installed on the inner wall of the right panel of the shell 1 and its discharge side is connected with the discharge port, and the feed side of the discharge die head 21 is connected with the channel 15. The opening length of the feed side of the discharge die head 21 is slightly larger than the opening length of the channel 15, which is convenient for the mixed material 23 to enter the inside of the discharge die head 21. At the same time, the mixed material 23 output by the discharge die head 21 is also flat, which only guides and shapes the mixed material to ensure the output quality of the mixed material.

[0059] Furthermore, the long fiber reinforced thermoplastic composite crawler type mixing equipment also includes a scraper 5 located inside the shell 1, the scraper 5 is arranged between the crawler 14 and the two sides of the discharge die 21, the two ends of the scraper 5 are respectively rotatably connected to the side walls of the shell 1, and the rotating shaft at one end of the scraper 5 is exposed from the shell 1 and is assembled and fixed with a transmission wheel, and the transmission wheel is respectively connected to two groups of corresponding third reduction motors 4 through a transmission belt, which is used to synchronously drive the two groups of scrapers 5 to rotate, and The rotation direction of the scraper 5 is opposite to that of the corresponding crawler 14. A radially distributed scraper plate is provided on the outer side wall of the scraper 5. The scraper plate is a rubber plate and is distributed along the axial direction of the scraper 5. It is used to scrape off the mixture 23 adhering to the surface of the crawler 14 when it contacts the surface of the crawler 14, so that the mixture 23 is located inside the channel 15 and enters the discharge die 21. The arrangement of the scraper 5 can ensure the conveying effect of the mixture 23, so that the mixture 23 will not adhere to the surface of the crawler 14, there is no accumulation of material and no need to clean it up, and the labor cost is reduced.

[0060] Furthermore, the long fiber reinforced thermoplastic composite crawler type mixing device further includes a roller cutter 18, a screw feeder 10 and a traction flattening roller 22. The roller cutter 18, the screw feeder 10 and the traction flattening roller 22 are separately provided and used in conjunction with the long fiber reinforced thermoplastic composite crawler type mixing device, specifically:

[0061] The discharge side of the screw feeder 10 is connected and fixed to the feeding die head 20 and the two are interconnected. The front end of the screw feeder 10 is provided with a thermoplastic resin feeding port 11, and the upper end of the screw feeder 10 is provided with a fiber feeding port 17 for feeding fibers 19, and the fibers 19 are cut to a fixed length from the upper part of the fiber feeding port 17 by a roller cutter 18 and then fed into the inside thereof. The fibers 19 are glass fibers, carbon fibers, basalt fibers, etc., and the length of the fibers 19 is 15-25 mm. The thermoplastic resin is polypropylene, polyethylene, polyamide, etc. The traction flattening roller 22 is arranged outside the discharge port of the housing 1, and the mixed material 23 is drawn out from the discharge port after passing through the traction flattening roller 22;

[0062] In the above structure, the position of the fiber feeding port 17 is mainly used to feed the fiber 19 into the thermoplastic resin in a molten state, while avoiding excessive stirring and conveying of the fiber by the screw feeder 10, thereby reducing the damage to the fiber 19 and ensuring the length of the fiber 19. The thermoplastic blanks produced by the equipment are evenly mixed, with a fiber length of 15~25mm, a fiber content of 30~50%, and a thickness of 3~10mm. The blanks can be directly sent to the press for molding production, and can also be stored for secondary use.

[0063] The above descriptions are only preferred implementation modes of the present invention. As long as the technical solutions for the purposes of the present invention are achieved by substantially the same means, they are within the protection scope of the present invention.

Claims

1. A long fiber reinforced thermoplastic composite crawler mixing device, characterized in that: include: A shell, wherein two opposite side walls of the shell are respectively provided with a feed port and a discharge port; and two sets of track mechanisms distributed in parallel, the track mechanisms are installed and fixed inside the shell, a channel for conveying the mixture is formed between the two sets of track mechanisms, the track surface of the track mechanisms is provided with a protrusion for extruding the mixture in the channel, the edges on both sides of the channel respectively form a closed structure with the inner wall of the shell, and the openings of the feed end and the discharge end of the channel are respectively arranged in one-to-one correspondence with the feed port and the discharge port and are connected to each other; It also includes a feeding die head, the feeding die head is installed on the side wall of the shell and the feeding side of the feeding die head is connected with the feeding port, the discharge side of the feeding die head is connected with the channel, and the opening length of the discharge side of the feeding die head is equal to or slightly smaller than the opening length of the channel; It also includes a discharge die head, the discharge die head is installed on the side wall of the shell and the discharge side thereof is connected with the discharge port, the feed side of the discharge die head is connected with the channel, and the opening length of the feed side of the discharge die head is equal to or slightly larger than the opening length of the channel; The crawler mechanism comprises a crawler, a support body and a driving roller. The support body has a smooth surface and arc surfaces at both ends. The crawler is wrapped around the support body and the outer side of the surface at both ends and is slidably arranged between the two. The driving roller is located outside the side of the crawler mechanism away from the channel and is connected to the crawler transmission. On the outer surface of the crawler, transmission teeth of an integral structure are processed at the edges of both sides of the crawler, and a protrusion of an integral structure is processed in the middle of the crawler. The protrusion is located between the transmission teeth, and the protrusion is a linear structure and is evenly distributed on the surface of the crawler. The two ends of the protrusion are aligned with the inner end surfaces of the transmission teeth, and the protrusions are parallelly distributed to form a wavy structure, so that the length direction of the protrusion is perpendicular to the sliding direction of the crawler. During the sliding process of the crawler, the mixed material can be squeezed by the protrusion to fully mix the fiber and the thermoplastic resin; Transmission teeth with matching shapes are respectively arranged on the surfaces at both ends of the driving roller and the edge surfaces at both sides of the crawler, and the driving roller and the crawler are meshed and connected via the transmission teeth; The driving teeth of the crawler are arranged higher than the protrusions of the crawler; The support body is provided with mounting holes on both sides and is connected and fixed to the side wall of the shell through bolts; The two ends of the driving roller are respectively rotatably connected to the side walls of the shell, and the rotating shaft of at least one end of the driving roller is exposed from the shell; The protrusions are linear structures and are evenly distributed on the surface of the track. The two ends of the protrusions are respectively aligned with the edges of the two sides of the track or the transmission teeth on the two sides of the track, and the protrusions are distributed in parallel. The length direction of the protrusion is perpendicular to the sliding direction of the crawler track; 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 crawler track is 45-60 degrees; The speed difference between the crawler tracks of the two crawler track mechanisms is 0.5-2.0 m / min; The support body is made of heat-conducting material and has a heating channel inside. A liquid inlet and a liquid outlet connected by a 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 has a groove inside, and an electric heating device is arranged inside the groove; It also includes a screw feeder, the discharge side of the screw feeder is fixedly connected to the feeding die head and the two are interconnected, and the upper end of the screw feeder is provided with a fiber feeding port for feeding fibers; The fibers are cut to a fixed length by a roller cutter from the upper part of the fiber feeding port and then fed into the interior.

2. The long fiber reinforced thermoplastic composite crawler type mixing equipment according to claim 1, characterized in that: It also includes a scraper located inside the shell, the scraper is arranged between the crawler and the discharge die head, the two ends of the scraper are respectively rotatably connected to the side walls of the shell, and the rotating shaft of at least one end of the scraper is exposed from the shell.

3. The long fiber reinforced thermoplastic composite crawler type mixing equipment according to claim 1, characterized in that: It also includes a traction and flattening roller, which is arranged outside the discharge port of the shell, and the mixed material is led out from the discharge port after passing through the traction and flattening roller.

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