PVC raw material mixing device

Abstract

The invention relates to the technical field of material mixing devices, particularly provides a PVC raw material mixing device, and aims to solve the technical problems of non-uniform heating and non-uniform mixing of materials during material mixing of an existing material mixing device. In order to achieve the purpose, a first gas guide disc and a second gas guide disc of the PVC raw material mixing device are both arranged in a hot boiler barrel, side baffle rings are distributed in the hot boiler barrel in the axial direction, and a heating material mixing cavity is defined by the first gas guide disc and the second gas guide disc; the stirring paddle is mounted in the heating and mixing cavity and is used for scattering the falling raw materials; and a propelling piece is arranged on the inner circumferential wall of the side baffle ring and can be used for pushing the raw materials attached to the inner wall of the side baffle ring into the heating and mixing cavity again. And through the arrangement of the agitating piece and the cooperation of the agitating piece and the stirring paddle, the problem that raw materials are easily attached to the inner wall of the device and are difficult to participate in mixing is solved, and the raw material mixing uniformity is improved. Friction heat generated by mutual collision of the raw materials is used for heating, so that the condition of local overheating aging or insufficient heating is avoided, and uniform heating of the raw materials is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mixing devices, in particular to a PVC raw material mixing device. BACKGROUND

[0002] Polyvinyl chloride (PVC) is a widely used synthetic material. In the production and processing process of PVC, the uniformity of the mixing of raw materials and the temperature control directly affect the forming quality, mechanical properties and processing stability of subsequent products. In the preparation process of PVC products, it is often necessary to fully mix PVC resin powder with plasticizers, stabilizers, fillers and other additives, and at the same time, the mixed raw materials need to reach a suitable temperature to ensure that the additives are uniformly dispersed in the resin powder and improve the processing adaptability of the raw materials.

[0003] Specific mixing steps are as follows: when mixing PVC raw materials, i.e., before entering the extruder, the raw materials are put into the hopper according to the formula ratio, and other processing additives are separately metered and mixed together and then put into the hopper and sucked into the feed tank through the vacuum feeder. The feed tank sends the raw materials to the hot pot, and then the hot pot heats and warms up to mix the raw materials at high speed and raise the temperature to 125 to 130 degrees, so that the processing additives are melted and the water vapor in the raw materials is removed, so that the raw materials meet the use requirements. Then the raw materials enter the cold pot for rapid cooling from 130 degrees to 40 degrees.

[0004] The existing hot pot for mixing PVC raw materials is mostly mixed by setting a stirring structure to stir the raw materials, and an external heating component (such as a heating jacket or a heating pipe) is used to heat the raw materials. Some existing high-speed mixers use high-speed stirring friction to heat to achieve the fusion of additives and resin. However, the existing mixing device has many deficiencies in actual application: on the one hand, the external heating method is easy to cause uneven heating of the raw materials, and the raw materials close to the heating component are easy to overheat and age locally, while the raw materials far from the heating component are difficult to reach the preset temperature, affecting the mixing quality; on the other hand, during high-speed stirring, part of the raw materials is easy to be thrown to the inner wall of the device by centrifugal force. These raw materials attached to the wall are difficult to be re-rolled into the stirring area, not only reducing the uniformity of the raw materials, but also causing the heat transfer efficiency to decrease due to long-term adhesion, further exacerbating the uneven heating problem. SUMMARY

[0005] To overcome the above-mentioned defects, the embodiments of the present application provide a PVC raw material mixing device, which solves the technical problem of uneven heating and mixing of the existing mixing device during mixing.

[0006] According to one aspect, at least one embodiment of the present application provides a PVC raw material mixing device, comprising: A hot pot barrel, a first air guide disc and a second air guide disc are arranged in the hot pot barrel, and a feeding port is arranged on the first air guide disc; A plurality of side retaining rings are arranged in the hot pot barrel in an axial direction, and the plurality of side retaining rings enclose a temperature rising mixing cavity between the first air guide disc and the second air guide disc; A stirring paddle is arranged in the temperature rising mixing cavity and is used for dispersing raw materials falling through the feeding port; Each of the grooves is provided with a stirring member; the stirring member can hit the raw materials in the side retaining ring to the inner wall of the side retaining ring again, and then hit the raw materials to the temperature rising mixing cavity, so as to improve the temperature of the raw materials through the friction generated by the mutual collision of the raw materials.

[0007] Optionally, a plurality of air injection holes are arranged on the peripheral wall of the second air guide disc, the air injection holes are communicated with the temperature rising mixing cavity, and high-temperature gas is injected into the temperature rising mixing cavity, so as to heat and disturb the raw materials.

[0008] Optionally, the first air guide disc has an air cavity, the first air guide disc is provided with at least one air inlet for communicating the temperature rising mixing cavity and the air cavity, and a plurality of air outlets communicated with the air cavity; an air flow channel communicated with the air outlets is formed between the peripheral wall of the side retaining ring and the inner wall of the hot pot barrel; The plurality of side retaining rings are divided into fixed retaining rings and rotating retaining rings, the fixed retaining rings and the rotating retaining rings are arranged in an interval, arc-shaped turbine blades are arranged on the peripheral walls of the fixed retaining rings and the rotating retaining rings, the turbine blades are located in the air flow channel, and the extension directions of the turbine blades on the fixed retaining rings and the rotating retaining rings are opposite; The gas in the temperature rising mixing cavity can enter the air cavity through the air inlet, and then flow to the air flow channel through the air outlet, so as to drive the turbine blades to rotate the rotating retaining rings.

[0009] Optionally, a plurality of air passing channels are arranged on the fixed retaining rings and the rotating retaining rings in a circumferential direction, the air passing channels are one-to-one corresponding and communicated with the stirring members; a plurality of rotary air passages are arranged on the second air guide disc, and the rotary air passages are one-to-one corresponding and communicated with the air passing channels of the fixed retaining ring at the bottom; When the exhaust port exhausts the gas to the gas passage of the top rotating baffle ring, the gas passage and the rotary gas channel can input the gas from the gap between the adjacent turbine blades to the airflow passage to drive the rotating baffle ring to rotate, and when the rotating baffle ring rotates, the gas passage of the top rotating baffle ring and the exhaust port can be intermittently connected, and the gas passage of the fixed baffle ring and the gas passage of the rotating baffle ring are also intermittently connected, so that the driving member is alternately inflated and deflated and driven.

[0010] Optionally, the driving member comprises: an air bag arranged in the groove and connected with the gas passage; an elastic sheet arranged in the groove and close to the opening side of the groove, the elastic sheet can vibrate under the thrust of the air bag when the air bag is inflated to hit the raw materials.

[0011] Optionally, the first gas guide disc and the second gas guide disc each have a tapered guide surface for guiding the raw materials downward.

[0012] Optionally, the hot pot cylinder is provided with a feeding pipe, the lower end of the feeding pipe penetrates the feeding port, the hot pot cylinder has a preheating cavity above the first gas guide disc; the first gas guide disc is provided with an exhaust channel penetrating thereon, the exhaust channel is connected with the airflow passage and the preheating cavity respectively, and can discharge the gas in the airflow passage to the preheating cavity to preheat the raw materials in the feeding pipe.

[0013] Optionally, the second gas guide disc has a discharging port, the stirring paddle penetrates the discharging port, the stirring paddle has a rotating shaft, the rotating shaft has a peripheral wall, and the peripheral wall and the discharging port have a material passing gap, the hot pot cylinder has a temporary storage cavity below the second gas guide disc for temporarily storing the materials; the rotating shaft is provided with a material pushing scraper, the material pushing scraper is located in the temporary storage cavity, the hot pot cylinder is provided with a discharging port at the bottom, and the material pushing scraper is used to push the raw materials in the temporary storage cavity to the discharging port.

[0014] Optionally, the rotating shaft is provided with a plug which slides up and down, the plug is internally provided with a driving member for driving the plug to move along the axial direction of the rotating shaft, the plug is located above the material pushing scraper and is used to block the discharging port when the raw materials are mixed and heated.

[0015] Optionally, it further comprises a feeding hopper, a feeding pipe, a vacuum feeding machine and a cold pot, the feeding pipe is connected between the feeding hopper and the vacuum feeding machine, is used to receive the raw materials supplied by the feeding hopper and convey the raw materials to the vacuum feeding machine, the vacuum feeding machine is connected with the feeding pipe, and the cold pot is connected with the discharging port and is used to cool the mixed raw materials.

[0016] The beneficial effects of the present application are: In the present application, the raw materials enter the heating mixing cavity through the feed inlet on the first gas guide disc, and the stirring paddle starts to rotate to disperse and preliminarily mix the falling raw materials. During the stirring process, part of the raw materials will be thrown to the inner wall of the side retaining ring due to the centrifugal force, at which time the agitator in the side retaining ring starts to work to hit the attached raw materials again into the interior of the heating mixing cavity. The hit raw materials collide with the raw materials being mixed in the cavity, and the temperature of the raw materials is raised through the friction generated by the collision, while the mixing process is continuously completed. The problem that the raw materials are easily attached to the inner wall of the device and are difficult to participate in the mixing in the existing device is effectively solved, and the uniformity of the raw material mixing is improved. The friction heat generated by the collision between the raw materials is used for heating, which replaces the traditional external heating method, avoids the situation of local overheating aging or insufficient heating, and ensures the uniformity of the raw material heating. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments of the present application will be briefly introduced. Obviously, the drawings in the following description are only some example embodiments of the present application. For those skilled in the art, other drawings can be obtained according to the contents of the example embodiments of the present application and the drawings without paying creative labor.

[0018] Figure 1 FIG. 1 is a structural schematic diagram of the outer part of the hot pot cylinder in the present application; Figure 2 FIG. 2 is a sectional view of A-A in FIG. 1; Figure 1 Figure 3 FIG. 3 is a structural schematic diagram of the inner part of the hot pot cylinder in the present application; Figure 4 FIG. 4 is a structural schematic diagram of the side retaining ring in the present application; Figure 5 FIG. 5 is a structural schematic diagram of the turbine blade in the present application; Figure 6 FIG. 6 is a local enlarged view of B in FIG. 3; Figure 2 FIG. 7 is a local enlarged view of C in FIG. 3; Figure 7 Figure 2 FIG. 8 is a structural schematic diagram of the mixing device in the present application. Figure 8 FIG. 9 is a structural schematic diagram of the whole mixing device in the present application.

[0019] ​​Figure: 1, hot pot barrel, 101, feed inlet, 103, airflow channel, 2, first air guide disc, 201, air inlet, 202, air outlet, 203, air exhaust, 204, preheating cavity, 205, conical guide surface, 21, air cavity, 3, second air guide disc, 301, rotary air channel, 31, air injection hole, 32, discharge outlet, 33, temporary storage cavity, 4, side retaining ring, 401, temperature-raising mixing cavity, 402, groove, 403, airflow passage, 41, fixed retaining ring, 42, rotating retaining ring, 5, stirring paddle, 51, rotating shaft, 6, agitator, 601, air bag, 602, elastic sheet, 7, turbine blade, 8, feed pipe, 9, pushing scraper, 10, discharge port, 11, plug, 12, driving member, 13, feeding hopper, 14, feed pipe, 15, vacuum feeding machine, 16, cold pot. DETAILED DESCRIPTION

[0020] The application will be further described below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein merely serve illustrative purposes, and are not intended to limit the application.

[0021] For the sake of simplicity, only the parts related to the application are shown in the drawings, which do not represent the actual structure of the product. In addition, in order to make the drawings simple and easy to understand, in some drawings, only one of the parts with the same structure or function is shown, or only one of them is marked. In this document, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0022] In this document, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", and "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0023] In the application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include the direct contact of the first and second features, or the contact of the first and second features through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include the vertical direction of the first feature above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "lower", "lower" and "lower" of the first feature to the second feature include the vertical direction of the first feature below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0024] In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like, orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0025] In addition, in the description of the present application, the terms "first", "second", and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0026] As Figures 1-2 shown, which shows a PVC raw material mixing device in an embodiment of the present application, the raw material mixing device includes a hot pot cylinder body 1, a first air guide disc 2, a second air guide disc 3, a plurality of side retaining rings 4 and a stirring paddle 5, wherein the first air guide disc 2 and the second air guide disc 3 are respectively arranged at the top and bottom of the inner side of the hot pot cylinder body 1, a plurality of side retaining rings 4 are installed between the two first air guide discs 2 and the second air guide disc 3, and a plurality of side retaining rings 4 are coaxially arranged with the first air guide disc 2 and the second air guide disc 3, the lowermost side retaining ring 4 abuts with the top surface of the second air guide disc 3, and the uppermost side retaining ring 4 abuts with the bottom surface of the first air guide disc 2. The first air guide disc 2, the second air guide disc 3 and the plurality of side retaining rings 4 form a heating mixing cavity 401. In order to increase the mixing effect, the side retaining ring 4 can rotate, the setting mode of one rotating and the other stationary of the upper and lower adjacent side retaining rings 4 can be adopted, or the setting mode of the upper and lower adjacent two side retaining rings 4 rotating in opposite directions can be adopted, and the rotation of the side retaining ring 4 can be driven by a motor.

[0027] A feeding port 101 is formed at the center of the first air guide disc 2, and a rotatable stirring paddle 5 is arranged through the center of the second air guide disc 3, the stirring paddle 5 is located directly below the feeding port 101, and the paddle of the stirring paddle 5 is large, when the raw material enters the heating mixing cavity 401 from the feeding port 101, the raw material will first contact the paddle of the high-speed rotating stirring paddle 5, under the stirring action of the paddle, the raw material will be hit to the upper side, the side upper side and the side above the paddle, and a small part of the raw material will also directly fall on the second air guide disc 3.

[0028] As Figure 3As shown, in addition, a plurality of vertical grooves 402 are arranged on the inner peripheral wall of each side baffle ring 4 at equal intervals, and a stirring member 6 is arranged in each groove 402. The stirring member 6 can be stirred in the horizontal direction. During stirring, part of the raw materials will be thrown to the inner wall of the side baffle ring 4 under the action of centrifugal force. At this time, the stirring member 6 in the side baffle ring 4 starts to work, and the adhered raw materials are again hit to the inside of the temperature-raising mixing cavity 401. The hit raw materials collide with the raw materials being mixed in the cavity, and the temperature of the raw materials is raised through the friction generated by the collision, while the mixing process is continuously completed. It should be specifically noted that the high-speed collision and friction between the raw material particles can quickly raise the temperature of the material.

[0029] As shown in Figure 3 and Figure 4 shown, through the arrangement of the stirring member 6 and the cooperation of the stirring member 6 and the stirring paddle 5, the problem that the raw materials are easily attached to the inner wall of the device and are difficult to participate in mixing in the existing device is effectively solved, and the uniformity of the raw material mixing is improved. The friction heat generated by the collision between the raw materials is used for temperature raising, which replaces the traditional external heating method, avoids the situation of local overheating aging or insufficient heating, and ensures the uniformity of the raw material temperature raising.

[0030] As shown in Figure 2 and Figure 3 further understood that, because only the stirring paddle 5 hits the raw materials when the raw materials are fed, and then the raw materials are hit again by the stirring member 6, the number of hits is too small, and it is only suitable for use in the case where the temperature raising requirement is relatively low. When the raw materials need to be raised to a higher temperature, the number of collisions between the raw materials needs to be increased, so a plurality of air injection holes 31 are arranged on the top of the second gas guide disc 3. It should be specifically noted that the inside of the second gas guide disc 3 is a hollow cavity, the cavity is used for converging gas, at least one gas inlet pipe is arranged on the outer peripheral wall of the second gas guide disc 3, and the gas inlet pipe is connected with a gas source. One end of each air injection hole 31 communicates with the cavity, and the other end communicates with the temperature-raising mixing cavity 401. It should be noted that each air injection hole 31 is different in direction, but all faces the temperature-raising mixing cavity 401, so that the injected gas can blow around the raw materials, and the existence of the stirring paddle 5 can further disturb the gas when the gas reaches the stirring paddle 5, thereby further enhancing the disturbance effect of the gas flow on the raw material particles. It should be emphasized that when the air injection holes 31 are added, the raw materials are fed at one time, that is, after a certain amount of raw materials enter the temperature-raising mixing cavity 401, the feeding port 101 is closed, so that the raw materials can be mixed and temperature-raised in the closed temperature-raising mixing cavity 401.

[0031] As shown in Figure 2 and Figure 3As shown, in order to prevent the gas injection hole 31 from being blocked, a baffle plate is arranged at the top of the gas injection hole 31, the bottom surface of the baffle plate has a small gap from the nozzle of the gas injection hole 31, which can allow gas to be sprayed out, but can also block the raw materials from blocking the gas injection hole 31, and the top of the baffle plate is inclined, which is used to guide the flow of raw materials and prevent the raw materials from accumulating on the baffle plate.

[0032] In the above scheme, the gas directly heats the raw materials in the cavity on the one hand, and the friction heat assists in improving the heating efficiency; on the other hand, the gas injection forms a gas flow disturbance, which drives the raw materials to further tumble, so that the raw materials and the gas are in full contact, and at the same time, the collision frequency between the raw materials is enhanced, which improves the mixing and heating effect. By high-speed blowing of the raw materials, the number of times of friction heat between the raw materials is increased, the effect is enhanced, and the raw material heating efficiency is significantly improved, and the mixing and heating period is shortened. The gas flow disturbance further strengthens the mixing uniformity of the raw materials, avoids the problem of insufficient mixing caused by local accumulation of raw materials, and at the same time, the circulation of the gas helps to carry away the trace of moisture that may exist in the raw materials, and improves the quality of the raw materials.

[0033] As shown in Figure 2 and Figure 3 Further, the outer peripheral wall of the first gas guide disc 2 and the second gas guide disc 3 abuts against the inner peripheral wall of the hot pot cylinder body 1, but the annular gas flow channel 103 is formed between the outer peripheral wall of the side baffle ring 4 and the inner peripheral wall of the hot pot cylinder body 1, the side baffle ring 4 is divided into fixed and rotating types, the two types of baffle rings are arranged at intervals, and arc-shaped turbine blades 7 are arranged on the outer peripheral walls of the two types of baffle rings, the turbine blades 7 are located in the gas flow channel 103, and the extension directions of the turbine blades 7 on the two types of baffle rings are opposite. It should be emphasized that the present embodiment is described in the setting mode that one of the two adjacent side baffle rings 4 rotates and the other is fixed.

[0034] First of all, it is clear that the first gas guide disc 2 is internally provided with a sealed air cavity 21, the first gas guide disc 2 is provided with an air inlet 201 communicating the heating and mixing cavity 401 and the air cavity 21, and a plurality of air outlets 202 communicating the air cavity 21 and the outside, and the gas flow channel 103 is in communication with the air outlet 202. The gas in the heating and mixing cavity 401 can enter the air cavity 21 through the air inlet 201, and then flow into the gas flow channel 103 through the air outlet 202 to drive the turbine blades 7 to rotate.

[0035] Specifically, when the gas enters the gas flow channel 103, the gas flow circulates downward, and when the gas flow contacts the turbine blades 7 of the rotating baffle ring 42, the gas flow drives the side baffle ring 4 to rotate, because the turbine blades 7 are inclined, so the gas flow changes direction, and then the gas flow continues to flow downward, and when the gas flow reaches the turbine blades 7 of the fixed baffle ring 41, the turbine blades 7 change direction again to directly impact the turbine blades 7 of the next rotating baffle ring 42.

[0036] In the above scheme, the recycling of the gas is realized, the gas after participating in the mixing and heating is introduced into the airflow channel 103 to drive the rotation of the rotating baffle ring 42, without the need for additional driving mechanism, thereby reducing the energy consumption. The setting of the airflow channel 103 makes the gas flow more smooth, and improves the energy utilization rate. The rotation of the rotating baffle ring 42 can indirectly disturb the temperature rising mixing cavity 401, thereby assisting to improve the mixing effect of the raw materials.

[0037] As shown in Figures 2-7 Further, a plurality of air passing channels 403 are arranged on the fixed baffle ring 41 and the rotating baffle ring 42 in the circumferential direction at intervals, each air passing channel 403 is in communication with the corresponding position of the agitating piece 6; a plurality of rotary air passages 301 are arranged on the second air guide disc 3, the rotary air passages 301 correspond to and communicate with the air passing channels 403 of the bottommost fixed baffle ring 41 one by one. The gas discharged by the exhaust structure can enter the air passing channel 403 of the topmost rotating baffle ring 42, and then the gas is input to the turbine blade 7 gap of the airflow channel 103 through the air passing channel 403 and the rotary air passage 301, to drive the rotating baffle ring 42 to rotate; after the rotating baffle ring 42 rotates, the air passing channel 403 thereof intermittently communicates with the exhaust port 202, and the air passing channels 403 of the fixed baffle ring 41 and the rotating baffle ring 42 also intermittently communicate, thereby realizing the alternating inflation and deflation of the agitating piece 6. It should be noted that the number of exhaust ports 202 on the first air guide disc 2 is greater than the number of air passing channels 403 on the rotating baffle ring 42, and the number of air passing channels 403 on the fixed baffle ring 41 is also greater than the number of air passing channels 403 on the rotating baffle ring 42, so that no matter what position the rotating baffle ring 42 and the fixed baffle ring 41 are in, at least a part of the air passing channels 403 will communicate with the exhaust port 202, so as to facilitate the rotation of the rotating baffle ring 42 and avoid the phenomenon of "stuck". And because the rotating baffle ring 42 and the fixed baffle ring 41 are intermittently communicated, the gas flow into the airflow channel 103 is also unstable, so that the rotating speed of the side baffle ring 4 is unstable, and the circumferential rotation of the agitating piece 6 is also unstable, which can further disturb the raw materials through the grooves 402.

[0038] In the above scheme, when the gas discharged by the exhaust port 202 first enters the air passing channel 403 of the topmost rotating baffle ring 42, part of the gas enters the agitating piece 6 through the air passing channel 403, and part of the gas is transported to the air passing channel 403 of the bottommost fixed baffle ring 41 through the rotary air passage 301, and then flows into the turbine blade 7 gap of the airflow channel 103, to further assist the rotation of the rotating baffle ring 42. With the rotation of the rotating baffle ring 42, the communication state of the air passing channel 403 thereof and the exhaust port 202 is constantly switched, and the communication state of the air passing channel 403 of the adjacent fixed baffle ring 41 is also changed, so that the gas is intermittently entered or discharged into the agitating piece 6, thereby realizing the alternating inflation and deflation of the agitating piece 6, and further generating a continuous agitating action.

[0039] Therefore, through the cooperation of the air passage 403 and the rotary air duct 301, the distribution and circulation of the gas are realized, and the power source for the urging member 6 is provided. The alternating inflation and deflation of the urging member 6 realizes the urging action, improves the pushing effect on the wall material, and further enhances the uniformity of the material mixing. Without additional driving mechanism of the urging member 6, the urging action can be realized by relying on the gas circulation, which simplifies the device structure and reduces the equipment maintenance cost.

[0040] As shown in Figure 4 Further, the urging member 6 specifically consists of an air bag 601 and an elastic sheet 602. The air bag 601 is installed in the groove 402 of the side retaining ring 4 and is in communication with the air passage 403, and the inflation and deflation can be realized through the air passage 403; the elastic sheet 602 is installed in the groove 402 and is close to the opening side of the groove 402, and when the air bag 601 is inflated and expanded, a pushing action can be generated on the elastic sheet 602 to make the elastic sheet 602 vibrate.

[0041] In the above scheme, specifically, when the gas enters the air bag 601 through the air passage 403, the air bag 601 is gradually inflated and expanded, and the expanded air bag 601 generates a pushing force on the elastic sheet 602, so that the elastic sheet 602 bends and vibrates outward of the groove 402; when the air passage 403 is disconnected from the exhaust port 202, the air bag 601 starts to deflate and shrink under the extrusion action of the elastic sheet 602, and the elastic sheet 602 also returns to the original state and vibrates again in the process. The reciprocating vibration of the elastic sheet 602 can knock the material adhering to the inner wall of the side retaining ring 4 to the inside of the temperature-raising mixing chamber 401 and collide with other materials for mixing. The combined structure of the air bag 601 and the elastic sheet 602 makes the urging action softer and elastic, avoiding the damage to the material particles caused by rigid pushing. The high-frequency vibration of the elastic sheet 602 can efficiently clean the adhering material on the inner wall of the side retaining ring 4, and the cleaning effect is better than that of the traditional rigid structure. The structure is simple and reliable, not easy to damage, and the maintenance cost is low. At the same time, the buffering action of the air bag 601 can reduce the influence of the gas pressure fluctuation on the urging effect, and ensure the stability of the urging action.

[0042] As shown in Figure 3 Further, the first gas guide disc 2 and the second gas guide disc 3 are both provided with a tapered guide surface 205, which is directed to the side of the temperature-raising mixing chamber 401 and has the function of guiding the material downward, which can guide the material to smoothly enter or discharge the temperature-raising mixing chamber 401.

[0043] In the above scheme, the raw materials enter the first air guide disc 2 from the feed structure of the first air guide disc 2, and then slide smoothly and quickly to the inside of the temperature rising mixing cavity 401 under the action of the conical guide surface 205 of the first air guide disc 2, so as to avoid the accumulation of the raw materials on the first air guide disc 2. When the mixing and temperature rising of the raw materials are completed, the raw materials can move smoothly downward to the discharge area under the action of the conical guide surface 205 of the second air guide disc 3, so as to avoid the residues on the air guide disc. The setting of the conical guide surface 205 effectively solves the problem of the accumulation of the raw materials on the air guide disc, ensures the smoothness of the raw material conveying, and improves the efficiency of the feeding and discharging.

[0044] As shown in Figures 2-3 Further, the hot pot cylinder body 1 is provided with a feeding pipe 8, the lower end of the feeding pipe 8 extends to above the temperature rising mixing cavity 401 through the feeding port 101 of the first air guide disc 2; because there is a certain distance between the top of the first air guide disc 2 and the top of the hot pot cylinder body 1, a preheating cavity 204 can be formed in the area above the first air guide disc 2 in the hot pot cylinder body 1; the first air guide disc 2 is provided with a gas discharge channel 203 penetrating therethrough, one end of the gas discharge channel 203 communicates with the gas flow channel 103, and the other end communicates with the preheating cavity 204, so as to guide the gas in the gas flow channel 103 into the preheating cavity 204.

[0045] In the above scheme, specifically, the raw materials are conveyed into the device through the feeding pipe 8, and the gas carrying heat in the gas flow channel 103 flows into the preheating cavity 204 through the gas discharge channel 203. The gas in the preheating cavity 204 fully contacts the feeding pipe 8, transfers heat to the raw materials in the feeding pipe 8, and realizes the preheating treatment of the raw materials. The preheated raw materials enter the temperature rising mixing cavity 401 through the lower end of the feeding pipe 8, and then undergo the subsequent mixing and temperature rising process. The gas in the preheating cavity 204 can be discharged through the exhaust structure of the device after completing the preheating. The waste heat recovery is realized, the waste heat of the gas in the gas flow channel 103 is used for preheating the raw materials, the energy utilization rate is improved, and the overall energy consumption is reduced. After the raw materials are preheated in advance, the temperature rising time in the temperature rising mixing cavity 401 is shortened, and the production efficiency is improved. The preheated raw material particles have enhanced activity, are more easily mixed with other additives, and the mixing quality is further improved.

[0046] As shown in Figure 2 Further, the second air guide disc 3 is provided with a discharge port 32, the stirring paddle 5 extends below the second air guide disc 3 through the discharge port 32; the stirring paddle 5 is provided with a material passing gap between the rotating shaft 51 and the discharge port 32 for the raw materials to pass through; a temporary storage cavity 33 is formed in the area below the second air guide disc 3 in the hot pot cylinder body 1, for temporarily storing the raw materials after the mixing and temperature rising are completed; the rotating shaft 51 is provided with a pushing and scraping plate 9 outside the periphery, the pushing and scraping plate 9 is located in the temporary storage cavity 33; the bottom of the hot pot cylinder body 1 is provided with a discharge port 10, and the pushing and scraping plate 9 can push the raw materials in the temporary storage cavity 33 to the discharge port 10.

[0047] In the above scheme, after the raw materials are mixed and heated in the heating mixing cavity 401, they fall into the temporary storage cavity 33 below through the discharge port 32 of the second gas guide disc 3 and the material passing gap between the rotating shaft 51 and the discharge port 32. When the stirring paddle 5 rotates, the pushing scraper 9 on the outer periphery of the rotating shaft 51 rotates synchronously. The pushing scraper 9 pushes the raw materials accumulated in the temporary storage cavity 33 to the discharge port 10 at the bottom of the hot pot cylinder 1 during rotation, and the raw materials are discharged through the discharge port 10 and enter the subsequent processing link. The setting of the temporary storage cavity 33 can ensure the stability of the discharging process. The setting of the pushing scraper 9 realizes the active pushing of the raw materials, avoids the accumulation and caking of the raw materials in the temporary storage cavity 33, and improves the discharging efficiency. The pushing scraper 9 and the stirring paddle 5 share the same driving mechanism, which simplifies the structure of the device, reduces energy consumption, and ensures the synchronization and coordination of the discharging and mixing processes.

[0048] Further, the rotating shaft 51 is provided with a plug 11 which slides up and down, the plug 11 is provided with a driving member 12 for driving it to move along the axis of the rotating shaft 51, the plug 11 is located above the pushing scraper 9 and is used to block the discharge port 32 when the raw materials are mixed and heated. It should be noted that the driving member 12 is built into the plug 11, the plug 11 is resistant to high temperature, the plug 11 has an installation cavity inside, the driving member 12 is a roller or a ball and a motor, the roller is symmetrically provided with two groups about the rotating shaft 51, the motor rotates through the roller to realize the axial movement of the roller driving the plug 11 along the rotating shaft 51. It can be understood that the plug 11 includes an outer cylinder and an inner cylinder, the driving member 12 is installed in the inner cylinder, the outer cylinder and the inner cylinder are relatively slidably connected, the driving member 12 and the inner cylinder can rotate with the rotating shaft 51, but the outer cylinder does not rotate because it abuts against the inner wall of the discharge port 32. Thus, the plug 11 can block the discharge port 32 and does not affect the rotation of the rotating shaft 51.

[0049] In the above scheme, specifically, the plug 11 is located above the pushing scraper 9, and its size is matched with the discharge port 32, which can block the discharge port 32 during the mixing and heating of the raw materials. When the raw materials enter the heating and mixing chamber 401 for mixing and heating, the driving component drives the plug 11 to move upward along the rotating shaft 51 until the plug 11 completely blocks the discharge port 32 of the second air guide disc 3, preventing the raw materials that have not completed mixing and heating from falling into the temporary storage chamber 33 in advance. When the raw materials have completed mixing and heating, the driving component drives the plug 11 to move downward along the rotating shaft 51, so that the plug 11 is separated from the discharge port 32, opening the discharge passage, and the mixed raw materials can fall into the temporary storage chamber 33 through the discharge port 32, and then be pushed by the pushing scraper 9 to the discharge port 10 for discharge. The controllable opening and closing of the discharge port 32 is realized, which ensures that the raw materials have sufficient time to complete mixing and heating in the heating and mixing chamber 401, and avoids the discharge of substandard raw materials affecting product quality. The lifting and sliding structure of the plug 11 is simple and reliable, the driving component is built-in the plug 11, which saves the installation space and does not affect the normal work of other components. The opening time of the plug 11 can be adjusted according to the mixing requirements of the raw materials, which improves the applicability of the device.

[0050] As shown in Figure 8 Further, the mixing device further includes a feeding hopper 13, a feeding pipe 14, a vacuum feeding machine 15 and a cooling pot 16. The feeding pipe 14 is connected between the feeding hopper 13 and the vacuum feeding machine 15 for conveying raw materials; the vacuum feeding machine 15 is communicated with the feeding pipe 8 to realize automatic feeding of raw materials; and the cooling pot 16 is communicated with the discharge port 10 for cooling the mixed raw materials.

[0051] In the above scheme, the raw materials are put into the feeding hopper 13 according to the formula proportion, and other processing aids are separately metered and mixed together and then put into the feeding hopper 13 and sucked into the feeding tank by the vacuum feeding machine 15. The feeding tank sends the raw materials to the hot pot cylinder 1, and then uses the principle of friction heating to mix the raw materials at high speed and raise the temperature to 125-130 degrees, so that the processing aids are melted and the water vapor in the raw materials is removed, so that the raw materials meet the use requirements. Then the raw materials enter the cooling pot 16 for rapid cooling from 130 degrees to 40 degrees, preventing premature plasticization or decomposition of processing aids.

[0052] The automatic feeding of raw materials is realized, replacing manual feeding, improving production efficiency and reducing labor intensity, while avoiding waste of raw materials and environmental pollution caused by manual feeding. The setting of the cooling pot 16 can quickly reduce the temperature of the mixed raw materials, avoiding problems such as caking and deterioration of high-temperature raw materials during subsequent conveying or storage, and ensuring the quality stability of the raw materials. The overall structure forms a complete raw material mixing and cooling production line, improving the integration degree and practicality of the device.

[0053] It should be noted that the above examples are only used to illustrate the technical solutions of the present application but not limit the present application. Although the present application is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or equivalently replaced, without departing from the spirit and scope of the technical solutions of the present application, which should be covered in the scope of the claims of the present application.

Claims

1. A PVC raw material mixing device, characterized in that, include: A hot pot cylinder (1) is provided with a first air guide plate (2) and a second air guide plate (3) located below the first air guide plate (2). The first air guide plate (2) is provided with a feed inlet (101). Several side baffle rings (4) are spaced apart along the axial direction inside the hot pot cylinder (1), and the several side baffle rings (4) form a heating mixing chamber (401) located between the first air guide plate (2) and the second air guide plate (3). A stirring paddle (5) is rotatably disposed in the heating and mixing chamber (401) to disperse the raw materials falling through the feed inlet (101); The inner circumferential wall of the side baffle ring (4) is provided with a plurality of grooves (402), and each groove (402) is provided with an agitator (6); the agitator (6) can knock the raw material that the stirring paddle (5) has thrown to the inner wall of the side baffle ring (5) back into the heating mixing chamber (401) so as to increase the temperature of the raw material through the friction generated by the collision between the raw materials.

2. The PVC raw material mixing device according to claim 1, characterized in that, The second air guide plate (3) has several air jet holes (31) on its peripheral wall. The air jet holes (31) are connected to the heating mixing chamber (401) and are used to spray high-temperature gas into the heating mixing chamber (401) to heat and disturb the raw materials.

3. The PVC raw material mixing device according to claim 2, characterized in that, The first air guide plate (2) has an air cavity (21) inside. The first air guide plate (2) is provided with at least one air inlet (201) for connecting the heating mixing chamber (401) and the air cavity (21), and a plurality of exhaust ports (202) connected to the air cavity (21); an airflow channel (103) connected to the exhaust ports (202) is formed between the outer peripheral wall of the side baffle ring (4) and the inner wall of the hot pot cylinder (1). The side baffle rings (4) are divided into fixed baffle rings (41) and rotating baffle rings (42). The fixed baffle rings (41) and the rotating baffle rings (42) are spaced apart. The outer peripheral walls of the fixed baffle rings (41) and the rotating baffle rings (42) are provided with arc-shaped turbine blades (7). The turbine blades (7) are located in the airflow channel (103). The turbine blades (7) on the fixed baffle rings (41) and the rotating baffle rings (42) extend in opposite directions. The gas in the heating mixing chamber (401) can enter the gas chamber (21) through the air inlet (201) and then flow into the airflow channel (103) through the exhaust port (202) to drive the turbine blades (7) to rotate the rotating retaining ring (42).

4. The PVC raw material mixing device according to claim 3, characterized in that, Both the fixed baffle ring (41) and the rotating baffle ring (42) are provided with a plurality of air passages (403) at circumferential intervals. The air passages (403) correspond one-to-one with and are connected to the agitator (6). The second air guide plate (3) is provided with a plurality of rotary air passages (301). The rotary air passages (301) correspond one-to-one with and are connected to the air passages (403) of the bottom fixed baffle ring (41). When the exhaust port (202) exhausts gas into the air passage (403) of the topmost rotating baffle ring (42), the air passage (403) and the rotary air passage (301) can input gas from the gap between the adjacent turbine blades (7) into the airflow passage (103) to drive the rotating baffle ring (42) to rotate. When the rotating baffle ring (42) rotates, the air passage (403) of the topmost rotating baffle ring (42) and the exhaust port (202) can be intermittently connected, and the air passage (403) of the fixed baffle ring (41) and the air passage (403) of the rotating baffle ring (42) are also intermittently connected, so that the agitator (6) alternately fills and releases gas and agitates.

5. A PVC raw material mixing device according to claim 4, characterized in that, The actuating element (6) includes: An airbag (601) is disposed in the groove (402) and communicates with the air passage (403); An elastic sheet (602) is disposed in the groove (402) and near the opening side of the groove (402). The elastic sheet (602) can vibrate under the pushing action of the airbag (601) when the airbag (601) is inflated, so as to knock away the raw materials.

6. A PVC raw material mixing device according to claim 1, characterized in that, Both the first air guide plate (2) and the second air guide plate (3) have a conical guide surface (205) for downward material guiding.

7. A PVC raw material mixing device according to claim 3, characterized in that, The hot pot cylinder (1) is provided with a feed pipe (8), the lower end of which passes through the feed inlet (101). The hot pot cylinder (1) has a preheating chamber (204) located above the first air guide plate (2). An exhaust channel (203) is provided through the first air guide plate (2). The exhaust channel (203) is connected to the airflow channel (103) and the preheating chamber (204) respectively, and can discharge the gas in the airflow channel (103) into the preheating chamber (204) to preheat the raw material in the feed pipe (8).

8. A PVC raw material mixing device according to claim 7, characterized in that, The second air guide plate (3) has a discharge port (32), the stirring paddle (5) is arranged through the discharge port (32), the stirring paddle (5) has a rotating shaft (51), the outer peripheral wall of the rotating shaft (51) and the discharge port (32) have a material passage gap, and the hot pot cylinder (1) has a temporary storage cavity (33) located below the second air guide plate (3) to temporarily store materials. A pusher scraper (9) is provided on the outer periphery of the rotating shaft (51). The pusher scraper (9) is located in the temporary storage cavity (33). The bottom of the hot pot cylinder (1) is provided with a discharge port (10). The pusher scraper (9) is used to push the raw material in the temporary storage cavity (33) toward the discharge port (10).

9. A PVC raw material mixing device according to claim 8, characterized in that, A plug (11) is slidably mounted on the rotating shaft (51). Inside the plug (11) is a drive unit (12) for driving it to move axially along the rotating shaft (51). The plug (11) is located above the pusher scraper (9) and is used to block the outlet (32) when the raw material is mixed and heated.

10. A PVC raw material mixing device according to claim 8, characterized in that, It also includes a feeding hopper (13), a conveying pipe (14), a vacuum feeder (15), and a cold pot (16). The conveying pipe (14) is connected between the feeding hopper (13) and the vacuum feeder (15) and is used to receive the raw materials supplied by the feeding hopper (13) and transport the raw materials to the vacuum feeder (15). The vacuum feeder (15) is connected to the feed pipe (8). The cold pot (16) is connected to the discharge port (10) and is used to cool the mixed raw materials.

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