Feeding premixing equipment for PVB single-screw extrusion

Abstract

The utility model discloses feeding and premixing equipment for PVB (Polyvinyl Butyral) single-screw extrusion. The feeding and premixing equipment comprises a double-rod mixing assembly, the first material conveying assembly, the second material conveying assembly and the third material conveying assembly are arranged at a feeding port of the double-rod material mixing assembly and are used for continuously conveying and discharging PVB resin powder, online and offline PVB recycled cut materials and liquid plasticizers respectively; the single-rod extrusion assembly is arranged at a discharge hole of the double-rod mixing assembly and is used for stably discharging the PVB resin powder, the online and offline PVB recycled cut materials and the liquid plasticizer which are fully mixed; wherein the single-rod extrusion assembly comprises a forced feeding bin arranged at a discharge port of the double-rod mixing assembly, and a single-screw extruder arranged at the output end of the forced feeding bin. The continuous mixing and feeding device realizes continuous mixing and feeding of PVB single-screw extrusion, realizes continuous and accurate control of materials in the process, is simple in structure, and is free of equipment pause and conveying dead angles in the material preparation process.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile laminated glass, specifically to a PVB single screw extrusion feeding premixing equipment. BACKGROUND

[0002] Laminated glass is also called sandwich glass, which is a composite glass product that is permanently bonded as a whole by special high-temperature pre-pressing (or vacuum extraction) and high-temperature high-pressure process after a layer or multiple layers of organic polymer interlayer film are sandwiched between two or more pieces of glass. Commonly used laminated glass interlayer films include PVB, SGP, EVA, PU, etc. Automobile laminated glass usually adopts PVB interlayer, and all PVB film production processes in China use double-screw extruders for extrusion. The use of double-screw extruders for extrusion can cause serious uneven dispersion between plasticizers (containing other additives) and PVB resins. At the same time, research has shown that PVB films produced by double-screw extrusion technology have significant differences in physical and mechanical properties and glass bonding performance even when sampled and analyzed at different locations in the same product roll. Therefore, in order to improve the above problems, a single-screw extrusion PVB production equipment and production process are adopted.

[0003] However, the existing single-screw extrusion PVB production equipment and production process also has some shortcomings in use.

[0004] Firstly, the process steps are complex, and it is difficult to accurately control the feeding precision.

[0005] Secondly, the horizontal mixer used in the existing single-screw extrusion PVB production equipment cannot achieve continuous feeding of the upper feeding system during operation.

[0006] Therefore, a PVB single-screw extrusion feeding premixing equipment is proposed. Utility model content

[0007] The utility model aims to provide a kind of PVB single screw extrusion feeding premixing equipment, and the equipment realizes the continuous mixing and feeding process of PVB single screw extrusion, and realizes the continuous and accurate control of material in the process, while the structure is simple, and there is no equipment stop and dead angle of transport in material preparation process.

[0008] To achieve the above object, the utility model provides the following technical scheme: a PVB single screw extrusion feeding premixing equipment, include: double -screw mixing assembly, first feeding assembly, second feeding assembly and third feeding assembly of double -screw mixing assembly feed inlet are equipped, are used for the continuous delivery of PVB resin powder, online and offline PVB recovery chopped material and liquid plasticizer and discharge; And single screw extrusion assembly of double -screw mixing assembly discharge port is equipped, for the stable discharge of PVB resin powder, online and offline PVB recovery chopped material and liquid plasticizer and fully mixed; Wherein, the single screw extrusion assembly includes the forced feeding bin of double -screw mixing assembly discharge port, and the single screw extruder of the forced feeding bin output end is set up, is used for the forced feeding of mixed material, stable extrusion.

[0009] Further, the double-screw mixing assembly includes a double-screw mixer, and a feed inlet and an injection inlet provided at the top of the double-screw mixer, wherein an inlet small material bin is provided on the feed inlet and is in communication with the first conveying assembly and the second conveying assembly, and the injection inlet is connected with the third conveying assembly.

[0010] Further, the first feeding assembly includes a first vacuum feeding machine, wherein the first vacuum feeding machine is connected with an external negative pressure suction fan at an access end, is connected with a resin ton tank at a feed inlet, and is connected with a resin buffer bin at a discharge outlet; a weighing control component is arranged inside the resin buffer bin to accurately control the feeding amount of PVB resin powder; a first feeder is arranged at the discharge outlet of the resin buffer bin, and the bottom of the first feeder is connected with the inlet small material bin and is composed of a feeding component and a loss weighing component, wherein the loss weighing component accurately and continuously measures the material conveyed into the inlet small material bin above the double-screw mixer.

[0011] Further, the second feeding assembly includes a second vacuum feeding machine for feeding of online and offline PVB recovery chopped material; a conical mixer is arranged at the discharge end of the second vacuum feeding machine for premixing of online and offline PVB recovery chopped material; and a second feeder is arranged at the bottom discharge outlet of the conical mixer, and the bottom discharge outlet of the second feeder is connected with the inlet small material bin, and a loss weighing component arranged therein is used for accurately and continuously measuring the material entering the inlet small material bin.

[0012] Further, the double-screw mixer is externally provided with a cooling water interlayer.

[0013] Further, the third feeding assembly includes a plasticizer metering device, the plasticizer metering device is connected with the injection inlet at the top of the double-screw mixer through an output pipe thereof, and an access pipe arranged thereon is connected with a plasticizer storage tank.

[0014] Compared with the prior art, the utility model has the beneficial effects as follows:

[0015] The utility model simplifies the prior art single screw premixing system structure, reduces the horizontal mixing link on the process, first, overcome the problem that horizontal mixer cannot continuously feed, second, the material mixing structure is simple, can make the feeding premixing precision greatly improve, reduces the delivery dead angle. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the process flow structure schematic view of the utility model;

[0017] Figure 2 It is Figure 1 The local enlarged structure schematic view.

[0018] In the drawing: 112, negative pressure feeding vacuum pipeline; 113, first vacuum feeding machine; 114, resin buffer bin; 117, first feeding machine; 211, second vacuum feeding machine; 212, conical mixer; 215, second feeding machine; 312, access pipe; 313, plasticizer metering device; 411, double screw mixer; 412, inlet small material bin; 611, forced feeding bin; 711, single screw extruder; 1101, resin ton container. DETAILED DESCRIPTION

[0019] In the description of the utility model, it is understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model. The embodiments of the utility model will be described in detail below with reference to the drawings.

[0020] Please refer to Figures 1 to 2 The utility model provides technical scheme preferably: a PVB single screw extrusion feeding premixing equipment, include: double rod mixing assembly, first feeding assembly, second feeding assembly and third feeding assembly are established at the double rod mixing assembly feed port, are used for the continuous conveying of PVB resin powder, online and offline PVB recycling chopped material and liquid plasticizer and discharge, and single rod extrusion assembly is established at the double rod mixing assembly discharge port, is used for the stable discharge of PVB resin powder, online and offline PVB recycling chopped material and liquid plasticizer and fully mixed, wherein, single rod extrusion assembly includes forced feeding bin 611 that is established at the double rod mixing assembly discharge port, and single screw extruder 711 that is arranged at the output end of forced feeding bin 611, is used for the forced feeding of mixed material, stable extrusion.

[0021] In this application, combined with Figure 1 ,2 As shown, the PVB resin powder, the online and offline PVB recycling chopped material and the liquid plasticizer are respectively fed into the double-screw mixing assembly through the first feeding assembly, the second feeding assembly and the third feeding assembly for the mixing process, and the accurate control of the metering of the PVB resin powder, the online and offline PVB recycling chopped material and the liquid plasticizer can be realized under the structural characteristics of the first feeding assembly, the second feeding assembly and the third feeding assembly, and the formula proportion mixing is realized.

[0022] Here, the double-screw mixing assembly is continuously operated, and after uniform mixing, the material is discharged through the discharge valve of the double-screw mixing assembly to the inlet of the forced feeding bin 611, and then is extruded through the single-screw extruder 711. The device realizes the process of continuous feeding, mixing and discharging of the mixed material, and has high efficiency.

[0023] The device simplifies the structure of the existing single-screw premixing system, reduces the horizontal mixing process in the process, overcomes the problem that the horizontal mixer cannot continuously feed, and simplifies the material mixing structure, so that the feeding and premixing accuracy can be greatly improved, and the conveying dead angle is reduced.

[0024] The application realizes the continuous mixing and feeding process of the PVB single-screw extrusion, realizes the continuous and accurate control of the material dosage in the process, and has a simple structure and no equipment downtime and conveying dead angle in the material preparation process.

[0025] Further, the double-screw mixing assembly includes a double-screw mixer 411, and a feeding port and an injection port arranged at the top of the double-screw mixer 411. The feeding port is provided with an inlet small material bin 412 which is in communication with the first conveying assembly and the second conveying assembly, and the injection port is connected with the third conveying assembly.

[0026] As shown in Figure 1 , 2 The inlet small material bin 412 is used to receive the materials conveyed by the first feeding assembly and the second feeding assembly, and convey the received PVB resin powder, online and offline PVB recycling chopped material to the inside of the double-screw mixer 411. Then, the double-screw mixer 411 premixes the liquid plasticizer, the PVB resin powder and the online and offline PVB recycling chopped material in the inside of the double-screw mixer 411, realizes the full absorption and uniform dispersion of the three materials, and improves the production performance of the PVB film.

[0027] Further, the first feeding assembly comprises a first vacuum feeding machine 113, wherein the access end of the first vacuum feeding machine 113 is connected with an external negative pressure suction fan, the feeding port is connected with a resin ton tank 1101, and the discharging port is connected with a resin buffer bin 114; and a weighing control component arranged inside the resin buffer bin 114 is used to accurately control the feeding amount of PVB resin powder; and the first feeding machine 117 arranged at the discharging port of the resin buffer bin 114, and the bottom of the first feeding machine 117 is connected with the inlet small material bin 412 and is composed of a feeding component and a loss weighing component, wherein the loss weighing component accurately and continuously measures the material fed into the inlet small material bin 412 above the double-screw mixing machine 411.

[0028] Here, as shown in Figure 1 , 2 , the access end of the first vacuum feeding machine 113 is connected with an external negative pressure suction fan through a negative pressure feeding vacuum pipeline 112, the feeding port is connected with a resin ton tank 1101, and the discharging port is connected with a resin buffer bin 114, so that when the PVB resin powder enters the inside of the resin buffer bin 114 through the first vacuum feeding machine 113, the weighing control component arranged in the resin buffer bin 114 can accurately control the feeding amount of the PVB resin powder, and then when the PVB resin powder passes through the first feeding machine 117, the loss weighing component where the first feeding machine 117 is arranged accurately and continuously measures the PVB resin powder fed into the inlet small material bin 412 above the double-screw mixing machine 411, to control the dosage of the PVB resin powder.

[0029] Further, the second feeding assembly comprises a second vacuum feeding machine 211 for feeding online and offline PVB recycling chopped materials; a conical mixing machine 212 arranged at the discharging end of the second vacuum feeding machine 211 for premixing the online and offline PVB recycling chopped materials; and a second feeding machine 215 arranged at the bottom discharging port of the conical mixing machine 212, and the bottom discharging port of the second feeding machine 215 is connected with the inlet small material bin 412, and the loss weighing component where the second feeding machine 215 is arranged is used to accurately and continuously measure the material entering the inlet small material bin 412.

[0030] In combination with Figure 1 , the online and offline PVB recycling chopped materials can be premixed through the conical mixing machine 212, and then when passing through the second feeding machine 215, the loss weighing component where the second feeding machine 215 is arranged is used to accurately and continuously measure the material entering the inlet small material bin 412 above the double-screw mixing machine 411, to complete the dosage control of the PVB recycling chopped materials, and it is worth mentioning that the second feeding machine 215 has the same structure as the first feeding machine 117.

[0031] Further, the double-screw mixing machine 411 is externally provided with a cooling water jacket.

[0032] The cooling water jacket outside the double screw mixer 411 can continuously pass cooling water to prevent the mixed resin powder from swelling.

[0033] Further, the third feeding assembly comprises a plasticizer metering device 313, which is connected with the injection port at the top of the double screw mixer 411 through an output pipe thereof, and an access pipe 312 arranged thereon is connected with a plasticizer storage tank.

[0034] The plasticizer metering device 313 is a mature technology, and thus will not be described herein again. The plasticizer and water solution are injected into the double screw mixer 411 through the injection hole of the double screw mixer 411, and the plasticizer metering device 313 is used to accurately inject the plasticizer and water solution during the mixing process, so that the formula proportion mixing is realized.

[0035] The specific operation of the device is as follows.

[0036] Firstly, the PVB resin powder is fed into the resin buffer bin 114 through the first vacuum feeder 113, and the loss-in-weight metering component arranged in the resin buffer bin 114 can accurately control the feeding amount of the resin powder.

[0037] Meanwhile, the online and offline PVB recycling and cutting materials are accurately and continuously metered into the inlet small material bin 412 on the top of the double screw mixer 411 through the conical mixer 212 and the second feeder 215 from the other side of the inlet small material bin 412.

[0038] Subsequently, the plasticizer and water solution are injected into the double screw mixer 411 through the access pipe 312, the plasticizer metering device 313 and the injection hole of the double screw mixer 411, and the plasticizer metering device 313 is used to accurately control the dosage of the plasticizer and water solution during the injection process, so that the formula proportion mixing is realized.

[0039] Finally, the mixed material is continuously mixed and conveyed through the double screw mixer 411, and is connected to the forced feeding bin 611 through the discharge port of the double screw mixer 411, and is conveyed to the single screw extruder 711 through the forced feeding bin 611, so that the material extrusion is completed.

[0040] In the present application, unless otherwise clearly specified and limited, the terms such as "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated, and the detachable mounting modes are various, for example, can be matched by plug-in and buckle, and for example, can be connected by bolts.

[0041] The above embodiment is only used for further illustrating the utility model, and cannot be understood as limiting the protection scope of the utility model. Some non-essential improvements and adjustments of the utility model by the technical engineers in the field according to the content of the utility model fall within the protection scope of the utility model.

Claims

1. A feeding and premixing device for PVB single-screw extrusion, characterized in that, include: Dual-bar mixing assembly; The first, second, and third conveying components located at the feed inlet of the dual-bar mixing assembly are used for the continuous conveying and discharging of PVB resin powder, online and offline recycled PVB shredded material, and liquid plasticizer, respectively. And a single-bar extrusion assembly located at the discharge port of the twin-bar mixing assembly, used for stable discharge of PVB resin powder, online and offline recycled PVB shredded material and liquid plasticizer; The single-screw extrusion assembly includes a forced feeding bin (611) located at the outlet of the double-screw mixing assembly, and a single-screw extruder (711) located at the output end of the forced feeding bin (611), for forced feeding and stable extrusion of the mixed materials.

2. The feeding and premixing equipment for PVB single-screw extrusion according to claim 1, characterized in that: The twin-screw mixing assembly includes a twin-screw mixer (411) and a feed inlet and an injection port provided on the top of the twin-screw mixer (411). The feed inlet is provided with an inlet hopper (412) which is connected to the first conveying assembly and the second conveying assembly. The injection port is connected to the third conveying assembly.

3. The feeding and premixing equipment for PVB single-screw extrusion according to claim 1, characterized in that: The first material conveying assembly includes a first vacuum feeder (113), wherein the first vacuum feeder (113) is connected to an external negative pressure suction fan at its inlet, connected to a resin ton tank (1101) at its outlet, and connected to a resin buffer silo (114) at its outlet. And a weighing control component installed inside the resin buffer chamber (114) can precisely control the amount of PVB resin powder fed. It also includes a first feeder (117) disposed at the outlet of the resin buffer silo (114), and the bottom of the first feeder (117) is connected to the inlet silo (412) and is composed of a feeding component and a loss-in-weight metering component, wherein the loss-in-weight metering component accurately and continuously measures and delivers the material to the inlet silo (412) above the twin-screw mixer (411).

4. The feeding and premixing equipment for PVB single-screw extrusion according to claim 1, characterized in that: The second feeding assembly includes a second vacuum feeder (211) for feeding online and offline PVB recycling shredded material; A conical mixer (212) installed at the discharge end of the second vacuum feeder (211) is used for premixing online and offline PVB recycling shredded material; And a second feeder (215) is provided at the bottom outlet of the conical mixer (212), and the bottom outlet of the second feeder (215) is connected to the inlet hopper (412), and the loss-in-weight metering component thereon is used to accurately and continuously measure the material entering the inlet hopper (412).

5. The feeding and premixing equipment for PVB single-screw extrusion according to claim 2, characterized in that: The twin-screw mixer (411) is equipped with a cooling water jacket.

6. The feeding and premixing equipment for PVB single-screw extrusion according to claim 1, characterized in that: The third feeding assembly includes a plasticizer metering device (313), which is connected to the injection port at the top of the twin-screw mixer (411) via its output pipe, and the access pipe (312) provided thereon is connected to the plasticizer storage tank.

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