CN111516168A - An online mixing and feeding system for SMC sheet molding compound - Google Patents

Abstract

The invention discloses an SMC sheet molding compound on-line mixing and feeding system, which comprises a high-speed mixer, wherein the lower part of the high-speed mixer is used for feeding and the upper part of the high-speed mixer is used for discharging, a stirring shaft which is connected with an output shaft of a driving motor for transmission is arranged in the high-speed mixer, stirring blades are arranged on the stirring shaft, the bottom of the high-speed mixer is respectively provided with a thickening agent auxiliary feeding hole, a resin paste material main feeding hole and a color paste material auxiliary feeding hole, and the upper part of the high-speed. The invention respectively corresponds three different materials to independent precise gear metering pumps, then respectively enters a mass flow meter through independent pipelines for metering control, respectively enters a dynamic high-speed mixer through the pipelines after reaching the standard, and the mixed materials are respectively conveyed to an upper gluing groove and a lower gluing groove of an SMC sheet molding compound unit for gluing through inclined material grooves. The novel and high-efficient cost of practicing thrift of material mixing of structural design, the production SMC sheet moulding compound product quality that promotes to a certain extent.

Description

An online mixing and feeding system for SMC sheet molding compound

technical field

The invention belongs to the technical field of mixing devices in the production process of SMC sheet-shaped molding compounds, in particular to an on-line mixing and feeding system for SMC sheet-shaped molding compounds.

Background technique

In the existing SMC sheet molding compound production process, the resin paste mixture must be prepared in advance before the resin paste mixture for forming the SMC sheet molding compound enters the upper and lower glue tanks of the SMC sheet molding compound unit. The current conventional practice is Mix materials with different components together for high-speed stirring, and the resin paste mixture after fully stirring and evenly mixing is transported from the material tank to the upper and lower gluing tanks of the SMC sheet molding compound unit. Due to the batch mixing of various materials to prepare the resin paste mixture, if the resin paste mixture cannot be used up in time, the thickener in the resin paste mixture will chemically react with the resin, resulting in an increase in the viscosity of the resin paste mixture, thereby increasing the viscosity of the resin paste mixture. This results in poor wettability between the resin paste mixture and glass fiber, which affects the quality of the SMC sheet molding compound. In severe cases, the SMC sheet molding compound cannot be glued due to its high viscosity, resulting in unnecessary waste. It will increase the production cost of the enterprise.

SUMMARY OF THE INVENTION

The technical problem solved by the present invention is to provide an on-line mixing and feeding system for SMC sheet molding compound that is efficient and energy-saving and can effectively reduce the production cost of enterprises. In the on-line mixing and feeding system, three materials are prepared in separate containers, respectively. Each of the three prepared materials uses an independent precision gear metering pump to transport the materials to the high-speed mixer, and realizes the continuous feeding of the resin paste mixture in the state of online mixing.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions. An SMC sheet molding compound on-line mixing and feeding system is characterized in that it includes a high-speed mixer with a bottom feeding and an upper discharging, and the high-speed mixer is provided with a driving motor. The output shaft is connected to the driving stirring shaft. The stirring shaft is provided with a stirring blade that matches the inner cavity of the high-speed mixer and has the function of lifting materials. The bottom of the high-speed mixer is respectively provided with an auxiliary feeding port for thickener and a main feeding port for resin paste material. port and color paste auxiliary feeding port, the thickener container is connected with the thickener auxiliary feeding port at the bottom of the high-speed mixer through the pipeline and the metering pump I and the flow meter I connected to the pipeline in turn, and the resin paste material container passes through. The pipeline and the metering pump II and the flowmeter II connected to the pipeline in turn are connected to the main feed port of the resin paste material at the bottom of the high-speed mixer, and the color slurry container is connected to the pipeline through the pipeline and the metering pump III and the flowmeter III in turn. It is connected with the auxiliary feeding port of the color paste at the bottom of the high-speed mixer. The upper part of the high-speed mixer is provided with the discharge port of the upper gluing tank and the discharge port of the lower gluing tank. The materials that are dynamically mixed evenly by the mixer are transported to the upper gluing tank of the SMC sheet molding compound unit. .

Further limited, the metering pump I, the metering pump II and the metering pump III are all precision gear metering pumps, and the flowmeter I, the flowmeter II and the flowmeter III are mass flowmeters.

It is further limited that the driving motor is fixed on the vertical telescopic rod of the hydraulic cylinder through the motor base, and is used to drive the stirring shaft and the stirring blade to extend out of the high-speed agitator cavity through the hydraulic oil cylinder after the work is completed, so as to quickly clean the high-speed agitator cavity. body effect.

Compared with the prior art, the present invention has the following beneficial effects: the present invention respectively corresponds three different materials to independent precision gear metering pumps, and then enters the mass flowmeter through separate pipelines for metering control, and after reaching the standard, enters through pipelines respectively. Dynamic high-speed mixer, the mixed materials are transported online through the inclined material tank to the upper and lower gluing tanks of the SMC sheet molding compound unit for gluing. The SMC sheet-shaped molding compound on-line mixing and feeding system of the invention has a novel structure in design, can mix materials efficiently and save costs, improve the product quality of the SMC sheet-shaped molding compound to a certain extent, and can effectively reduce the production cost of the enterprise at the same time.

Description of drawings

1 is a schematic diagram of equipment and pipeline connections in the present invention.

In the figure: 1-high-speed mixer, 2-thickener container, 3-pipeline, 4-metering pump I, 5-flowmeter I, 6-resin paste material container, 7-metering pump II, 8-flowmeter II , 9-color slurry container, 10-metering pump III, 11-flow meter III, 12-SMC sheet molding compound unit, 13-upper gluing tank, 14- lower gluing tank.

Detailed ways

The technical scheme of the present invention is described in detail with reference to the accompanying drawings. As shown in FIG. 1, an SMC sheet molding compound online mixing and feeding system includes a high-speed mixer 1 with a bottom feeding and an upper discharging. The high-speed mixer 1 is equipped with There is a stirring shaft connected with the output shaft of the drive motor for transmission. The stirring shaft is provided with a stirring blade that matches the inner cavity of the high-speed mixer 1 and has a material-lifting function. The bottom of the high-speed mixer 1 is respectively provided with a thickener auxiliary feeding port, Resin paste material main feeding port and color paste auxiliary feeding port, thickener container 2 through pipeline 3 and the metering pump 14 and flowmeter 15 connected to pipeline 3 in turn and thickening at the bottom of high-speed mixer 1 The resin paste material container 6 is connected to the main feed port of the resin paste material at the bottom of the high-speed mixer 1 through the pipeline 3 and the metering pump II 7 and the flow meter II 8 connected to the pipeline 3 in turn. The material container 9 is connected with the color paste auxiliary feeding port at the bottom of the high-speed mixer 1 through the pipeline 3 and the metering pump III 10 and the flow meter III 11 connected to the pipeline 3 in turn, and the upper part of the high-speed mixer 1 is provided with an upper gluing groove. The discharge port and the discharge port of the lower gluing tank, the discharge port of the upper gluing tank conveys the dynamically mixed materials of the high-speed mixer 1 through the material tank to the SMC sheet molding compound unit 12 The upper gluing tank 13, the lower gluing The trough discharge port transports the materials that are dynamically mixed by the high-speed mixer 1 to the glue coating tank 14 under the SMC sheet molding compound unit 12 through the material trough. The metering pump I4, metering pump II8 and metering pump III10 of the present invention are all precision gear metering pumps, and the flowmeter I5, the flowmeter II8 and the flowmeter III11 are mass flowmeters. The driving motor of the present invention is fixed on the vertical telescopic rod of the hydraulic oil cylinder through the motor base, and is used to drive the stirring shaft and the stirring blade to extend out of the cavity of the high-speed agitator 1 through the hydraulic oil cylinder after the work is completed, so as to quickly clean the high-speed agitator 1. cavity effect.

The specific use process of the present invention is as follows: prepare three kinds of raw materials according to the following weight proportions: 1. Resin paste material raw materials and proportions: resin (6128ZH) 20-25Kg and low shrinkage machine (4:6) 9-13Kg; 2. , Thickener raw materials and ratio: curing agent 0.2-0.6, zinc stearate 1.1-1.5Kg and polymerization inhibitor 0.1-0.3Kg; 3. Color paste raw materials and ratio: aluminum hydroxide 10-20Kg, 800 Mesh calcium carbonate 25-35Kg and 400 calcium carbonate 15-25Kg. Design parameters: the flow rate of the metering pump connected to the thickener container is 400-600g/min; the flow rate of the metering pump connected to the resin paste material is 35000-45000g/min; the flow rate of the metering pump connected to the color paste container is 1000-15000g /mi. Subsequent production is carried out according to the design parameters of the conventional SMC sheet molding compound unit, the fiber content is 22%-35%, the blade gap is 1.5-2.0mm, and the vehicle speed is 6-15m/min.

The online mixing and feeding system and the SMC main engine linkage motor all use variable frequency motors, which are easy to operate. Only one button can start the entire assembly line at the same time; Paste) synchronously inject into the high-speed mixer according to the proportion for dynamic stirring and mixing. Since the stirring is the last process, the thickening time of magnesium oxide also lags, which ensures the impregnation effect. The three metering pumps used are all precision gear metering pumps, all imported from the United States, so as to achieve the purpose of accurate metering.

The pipelines of the online mixing and feeding system are all connected by quick fittings, which are easy and convenient to clean. After the work is completed, only the cavity of the high-speed mixer is cleaned, that is, the mixing barrel of the high-speed mixer. For the convenience of cleaning, an oil tank is specially installed to lift the mixing blades, and the cleaning can be completed in more than ten minutes.

In the present invention, the batching, stirring and pump conveying system adopts a centralized control mode, and the whole set of electrical components is installed in an independent power distribution control cabinet. The use of frequency converters, relays, circuit breakers, PLC programmable controllers and modules, 15-inch large-screen touch screen, and high-quality buttons as auxiliary (corresponding to touch screen software components) is very convenient to operate. The measurement of various materials uses the load cell readings to be fed back to the PLC for comparison, and the working status of each delivery metering pump is realized according to the parameter program. The SMC online mixing and feeding system is used with the SMC sheet production line to improve the auxiliary equipment for the SMC production line to produce SMC sheet molding compound sheets according to different formulas and different speeds and flow rates. The in-line mixing and feeding system reduces manpower and improves production efficiency, so that it can provide a complete and continuous fully automatic batching process with minimal labor configuration.

The online mixing and feeding system of the present invention is composed of various material conveying metering pumps, pipelines, high-speed mixers, control units and electronic control elements. The whole system is convenient and quick to operate. The configuration data and the working parameters of various metering pumps are set by the touch screen to control the control commands issued by the PLC controller to complete the production process requirements of the system. It can be linked with the SMC host, and can also be controlled independently. After setup, stop-auto-manual and on-line control are available with the push of a button. The online mixing and feeding system provides fourteen groups of formula data setting columns. It can be adjusted and switched arbitrarily to meet different production needs. When the formula data parameter is modified and set, password protection control has been added, and the modification can only be carried out after the password is entered correctly. Prevent other operators from inadvertently adjusting the disorder, resulting in unnecessary waste and loss. The main control unit (main paste and thickener) is equipped with weighing monitoring, flow control, material shortage, material shortage protection and alarm shutdown device to ensure the good production of flakes.

There are two control modes of the on-line mixed feeding system of the present invention, namely, the manual debugging mode and the automatic control mode. Manual debugging mode: run the test machine, power on the system, and set the touch screen to manual debugging mode after power-on. Enter each data parameter on the recipe and the required speed of each pump as required. Start and stop each delivery metering pump gradually to see if it works normally. After normal, start each delivery metering pump as required to start production. This process can be used for conveying and discharging the residual material after the automatic control mode is completed, which is convenient for cleaning the residual material in the system pipeline and preparing for the next production. Automatic control mode: Set the touch screen to automatic control mode, and input the corresponding parameters and recipes. Start the SMC host, and the system will start at the same time as the SMC host. The rotational speed of various conveying and metering pumps will also run synchronously with the SMC host, that is, when the SMC host accelerates or decelerates, the rotational speed of each material metering pump will also increase or decrease with the speed of the SMC host. The high-speed mixers are also synchronized with the SMC host. When the SMC host stops, the system stops at the same time as the SMC host. In manual debugging mode, this synchronization function is not available. When the main paste is short of material, it will alarm and stop to ensure the normal production of SMC sheets.

The basic principles, main features and advantages of the present invention have been shown and described above. Without departing from the spirit and scope of the present invention, the present invention has various changes and improvements, which all fall into the claimed invention. range.

Claims (3)

1. An on-line mixing and feeding system for SMC sheet molding compound is characterized by comprising a high-speed mixer which is fed from the lower part and discharged from the upper part, a stirring shaft which is connected with an output shaft of a driving motor in a transmission way is arranged in the high-speed mixer, a stirring blade which is matched with an inner cavity of the high-speed mixer and has a material lifting function is arranged on the stirring shaft, a thickening agent auxiliary feed inlet, a resin paste material main feed inlet and a color paste material auxiliary feed inlet are respectively arranged at the bottom of the high-speed mixer, a thickening agent container is connected with the thickening agent auxiliary feed inlet at the bottom of the high-speed mixer through a pipeline, a metering pump I and a flow meter I which are sequentially connected onto the pipeline, the resin paste material container is connected with the resin paste material main feed inlet at the bottom of the high-speed mixer through the pipeline, a metering pump II and a flow meter II which are sequentially, the upper portion of the high-speed mixer is provided with an upper glue coating groove discharge hole and a lower glue coating groove discharge hole, the upper glue coating groove discharge hole conveys materials which are dynamically and uniformly mixed by the high-speed mixer to an upper glue coating groove of the SMC sheet molding compound unit through a material groove, and the lower glue coating groove discharge hole conveys the materials which are dynamically and uniformly mixed by the high-speed mixer to the lower glue coating groove of the SMC sheet molding compound unit through the material groove.

2. An SMC sheet molding compound in-line mixing and feeding system as claimed in claim 1, wherein: the metering pump I, the metering pump II and the metering pump III are all precision gear metering pumps, and the flow meter I, the flow meter II and the flow meter III are mass flow meters.

3. An SMC sheet molding compound in-line mixing and feeding system as claimed in claim 1, wherein: the driving motor is fixed on the vertical telescopic rod of the hydraulic oil cylinder through the motor base and used for driving the stirring shaft and the stirring blades to extend out of the high-speed stirrer cavity through the hydraulic oil cylinder after work is finished, and the effect of quickly cleaning the high-speed stirrer cavity is achieved.

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