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Weighing twin-screw Gravimetric blender


source:[Gravimetric blender]   release time:2021-05-07 15:59:14




Weighing twin-screw Gravimetric blender
【Technical Field】
[0001] This utility model relates to a Gravimetric blender, especially a weighing twin-screw Gravimetric blender.
【Background technique】
[0002] The loss-in-weight continuous weighing metering feeding system is widely used in the production process of modified polymer materials that require accurate weighing and metering, and the ratio of raw materials is continuously and accurately metered to achieve the purpose of producing high-quality products. . The weighing twin-screw Gravimetric blender is one of the Gravimetric blenders of the loss-in-weight continuous weighing metering feeding system. It is specially used for powdery or small granular polymer materials, or powdery inorganic materials and short fibers. Materials, carry out continuous and accurate weighing and measurement.
[0003] The disadvantages of the existing weighing twin-screw Gravimetric blender are: the matching is not perfect, the user needs to match the raw material warehouse and the pneumatic disc valve; when the pneumatic disc valve is opened, the raw material warehouse is fed to the weighing hopper. Among them, due to the poor fluidity of powder materials or short fiber materials, the feeding process will be prolonged or the feeding process will be interrupted; when feeding, the material in the weighing hopper will have a "bridging" phenomenon, which will cause feeding discontinuity; The anti-interference ability is poor, and the hopper is supported by single or two load cells. Once mechanical vibration interference occurs, the hopper will shake and seriously affect the measurement accuracy; it is inconvenient to disassemble and install the twin-screw Gravimetric blender during maintenance or cleaning. The main components of the double-screw Gravimetric blender are connected by bolts, which is not conducive to disassembly and installation.
【content】

[0004] Purpose of the equipment: In view of the above technical problems, the present utility model provides a continuous and accurate metering suitable for powdery or small granular polymer materials, or inorganic materials and short fibers and other materials, and stable feeding of twin-screw extruders A weighing twin-screw Gravimetric blender for mixing, modifying and extruding out of the machine or single-screw extruder.
[0005] In order to achieve the above purpose, the present utility model adopts the following technical solutions: a weighing twin screw Gravimetric blender, including a raw material bin, a pneumatic butterfly valve, a weighing hopper and a twin screw feeding device, and the lower part of the raw material bin It is equipped with a pneumatic butterfly valve, which is connected to the feeding port of the weighing hopper. The lower part of the weighing hopper is equipped with a twin-screw feeding device, and the lower part of the twin-screw feeding device is equipped with a bellows weighing sensor; the raw material silo passes through a buffer spring and a support column. Installed on the two-story steel frame platform, the raw material silo is equipped with agitating paddle II, the mixing paddle 11 is connected to the mixing motor II, the lower part of the raw material silo is also equipped with a pneumatic vibrator, and the lower part of the pneumatic butterfly valve is connected to the weighing hopper feeding port through a rubber flexible tube , The weighing hopper is equipped with a stirring paddle I, and the stirring paddle I is connected to a stirring motor I.
[0006] Further, the weighing hopper includes an upper cover and a cone, and the twin screw feeding device includes a spherical feeding body, a feeding barrel, a blanking box, a feeding twin screw, a double-shaft distribution box and Geared motor, weighing hopper feeding port is set on the upper cover plate, the upper part of the cone is connected with the upper cover plate through the clamp II, and the lower part of the cone is connected with the upper part of the spherical feeder through the clamp I to form a whole, the spherical feeder The lower part is connected to the feeding barrel through a clamp III as a whole. One end of the feeding barrel is connected to the blanking box. The feeding twin screw is set in the feeding barrel and the spherical feeding body. The geared motor is connected to the double-shaft distribution box through the geared motor connecting sleeve. The input shaft is connected. The two output shafts of the double-shaft distribution box are connected to one end of the feeding twin screw through a connecting sleeve, and the other end of the feeding twin screw extends into the blanking box.
[0007] Further, the spherical feeding body and the biaxial distribution box are installed on the bottom plate, three bellows weighing sensors are provided below the bottom plate, the upper end of the bellows weighing sensor is connected to the bottom plate, and the lower end of the bellows weighing sensor passes The spacer is installed on the bracket.
[0008] Further, the two output shafts of the dual-shaft distribution box rotate in the same direction.
[0009] Further, the lower part of the raw material warehouse is also provided with a sight glass.
[0010] Compared with the existing weighing twin-screw Gravimetric blender, the utility model has the following advantages:
[0011] 1. The weighing hopper is used in conjunction with the pneumatic butterfly valve and the raw material silo, which saves the user's installation time and installation cost, and can realize the automatic control process of the weighing hopper feeding at low material level and stopping feeding at high material level.
[0012] 2. Each component adopts a modular combination, and independent components such as geared motor, feeding barrel, feeding twin screw, weighing hopper, feeding body, etc. are easy to install and disassemble, which is conducive to maintenance or cleaning; good interchangeability of parts , Reduce operation and maintenance costs.
[0013] 3. The feeding process of the raw material bin to the weighing hopper is smooth, which eliminates the phenomenon that the feeding process is prolonged or interrupted due to the poor fluidity of powder materials or short fiber materials.
[0014] 4. The phenomenon of material "bridging" in the weighing hopper during feeding is eliminated, and the continuity of feeding is ensured.
[0015] 5. The feeding is stable and accurate, and has excellent resistance to mechanical vibration interference, so that the feeding of materials can achieve the purpose of accurate measurement and stable feeding, and the relative error of continuous weighing and feeding is <0.2%.
[0016] 6. It can meet the requirements of the control process of the automatic control system, that is, the motor speed of the feeder can be controlled by the frequency converter to achieve the purpose of controlling the feeding amount. The high-sensitivity load cell outputs an analog electrical signal to the weighing terminal It is converted into a digital signal to the programmable controller.
[0017] The structure of this utility model is not intended.
[0018] Composition: 1- blanking box; 2- feeding twin screw; 3- feeding barrel; 4- clamp I; 5- mixing paddle I; 6_ weighing hopper; 7_ clamp II; 8- Pneumatic vibrator; 9-support column; 10-buffer spring; 11-material silo; 12-stirring propeller II; 13-stirring motor II; 14-view mirror; 15-pneumatic butterfly valve; 16-rubber flexible pipe; 17-mixing Motor I; 18-spherical feeding body; 19-double-shaft distribution box; 20-gear motor connection sleeve; 21-gear motor; 22-base plate; 23-corrugated pipe load cell; 24-pad; 25-bracket; 26-Clamp III, 27_ two-story steel platform.
【Detailed ways】
[0019] The utility model is further explained below in conjunction with the drawings.
[0020] As shown in Figure 1, the weighing twin-screw Gravimetric blender of the present invention includes a raw material bin 11, a pneumatic butterfly valve 15, a weighing hopper 6 and a twin-screw feeding device.
[0021] The raw material silo 11 is used to store raw materials. The raw materials can be pre-loaded into the raw material silo 11 by means of a feeder or air conveying. The raw material silo 11 is installed on a two-story steel frame platform through a buffer spring 10 and a support column 9. On the upper part 27, the buffer spring 10 can buffer the vibration interference of the two-story steel frame platform 27 to the raw material warehouse 11 when people walk or load materials. The upper part of the raw material warehouse 11 is provided with a stirring motor 1113, and the inside of the raw material warehouse 11 is provided with a stirring blade 1112. The upper end of the stirring blade II12 is connected with the output shaft of the stirring motor 1113. The lower part of the raw material warehouse 11 is provided with a pneumatic butterfly valve 15, a pneumatic vibrator 8 and a sight glass 14.
[0022] When the pneumatic butterfly valve 15 is opened and the raw material bin 11 is feeding the weighing hopper 6, the stirring motor II13 runs to drive the stirring paddle II12 to rotate in the raw material bin 11. At the same time, the pneumatic vibrator 8 vibrates the raw material bin 11 with high frequency and micro vibration. The silo wall prevents the feeding process from being prolonged or interrupted due to poor fluidity of powder materials or short fiber materials, ensuring the smooth feeding process, and the level of the materials in the raw material silo 11 can be observed through the sight glass 14.
[0023] The pneumatic butterfly valve 15 can be turned on/off controlled by the control system according to the material weight of the weighing hopper 6, and automatically complete the feeding and stopping of the feeding process from the raw material silo 11 to the hopper 6. The lower part of the pneumatic butterfly valve 15 passes rubber[Gravimetric blender]