Quantity-controlled conveying assembly for plastic product raw material processing

Abstract

The invention discloses a quantity control conveying assembly for plastic product raw material processing, relates to the technical field of plastic product processing, and aims to improve the conveying process of injecting plastic raw materials into a mold, and a built-in material pipe is arranged between a conventional preheating section and a melting section without changing the mode of continuously conveying the raw materials. The method is essentially characterized in that raw materials are continuously conveyed along with continuous proceeding of a conveying screw rod, the raw materials are subjected to three steps of primary storage, melting and material returning at the position corresponding to a built-in material pipe, and specifically, the process of switching the raw materials from a solid state to a liquid state is completed in the built-in material pipe; and finally, the liquid plastic raw material is extruded in an isolated air supply manner, and the raw material is conveyed by synchronously matching with a conveying screw rod, so that the extrusion amount of the raw material is controlled in a manner of limiting the air supply amount on the whole, and particularly, the extrusion amount difference generated during conversion of a solid state and a liquid state is reduced; and the continuity is still kept in the operation process of the whole structure.

Description

Technical Field

[0001] The invention relates to the technical field of plastic product processing, and in particular to a quantity-controlled conveying component for processing plastic product raw materials. Background Art

[0002] The processing technology of plastic products mainly includes blow molding, extrusion, etc. Specifically, the corresponding type of plastic raw materials are selected according to various process parameters, and the raw materials are pre-treated, such as the relevant contents mentioned in publication numbers CN112519034A and CN115648325A. Its essence is to cut, dry, preheat and other steps of the raw materials, and finally use them in blow molding molds or extrusion molds.

[0003] The raw materials need to be transformed into liquid in a high-temperature environment before being injected into the mold. At present, the main structure is the screw extruder. The screw extruder mechanism plays the role of continuous feeding on the basis of segmented operation. However, it needs to be further explained that the raw materials are first preheated and then melted at high temperature to form a liquid. There is a solid-liquid conversion state in the whole process, and there is a change in volume. Combined with the difference in volume-mass conversion, it eventually leads to a difference in the amount of raw materials injected into the mold. For example, too much raw material will lead to too much burrs on the product, and there will also be a waste of raw materials; when the raw material amount is too low, it will also affect the molding quality of the product;

[0004] This application proposes a solution to this problem. Summary of the invention

[0005] The purpose of the present invention is to provide a quantity-controlled conveying component for processing raw materials for plastic products. Regarding the raw material conveying process in the production process of plastic products, the conventional screw feeding method is essentially a continuous feeding method, in which there is a solid-liquid switching process, which indirectly affects the difference in the amount of raw materials injected into the mold, such as raw material waste or reduced molding quality.

[0006] The object of the present invention can be achieved by the following technical scheme: A controlled quantity conveying assembly for processing raw materials of plastic products, comprising a driving assembly, a silo and a conveying pipeline, wherein a conveying screw corresponding to the driving assembly is arranged inside the conveying pipeline, and an internal material pipe is installed at one end of the conveying pipeline;

[0007] A reverse spiral sheet and a right-hand push cone wheel are sequentially installed on the inner position of the conveying screw corresponding to the built-in material pipe in the direction from left to right, a fixed mounting block is installed on the inner wall position of the built-in material pipe corresponding to the middle position of the reverse spiral sheet and the right-hand push cone wheel, and a cooperative push block slidably connected to the conveying screw is arranged on one side position of the fixed mounting block corresponding to the right-hand push cone wheel;

[0008] A reflux pipe, a material exchange pipe and a reverse material pipe are installed at the position of the conveying pipe corresponding to the built-in material pipe. The left and right positions of the conveying pipe corresponding to the built-in material pipe are respectively set as a melting bin and a preheating bin. The left and right side areas of the fixed mounting block corresponding to the built-in material pipe are respectively set as a forward bin and a reverse bin.

[0009] It is further configured as follows: a material port for a material bin is provided on the conveying pipeline, and a preheating section and a melting section are provided on the conveying pipeline from right to left, respectively, and the built-in material pipe is provided in the middle position of the preheating section and the melting section.

[0010] It is further configured as follows: the material exchange pipeline is installed above the conveying pipeline, and the left end of the material exchange pipeline respectively penetrates the conveying pipeline and the built-in material pipe and is connected to the inside of the forward bin, and the right end of the material exchange pipeline penetrates the conveying pipeline and is connected to the inside of the preheating bin.

[0011] It is further configured as follows: the cross section of the material exchange pipeline is in a herringbone shape, and a material distribution fan is rotatably installed at the middle end of the material exchange pipeline, and a driving motor corresponding to the material distribution fan is installed at the outer position of the material exchange pipeline.

[0012] It is further configured as follows: the backflow pipe is arranged in a circular array along the center point of the conveying pipe, and both ends of the backflow pipe penetrate the conveying pipe to the interior of the built-in material pipe, and the two ends of the backflow pipe correspond to the forward bin and the reverse bin respectively, one end of the backflow pipe is connected to the interior of the reverse bin, and the other end of the backflow pipe is connected to the interior of the melting bin.

[0013] It is further configured as follows: the setting positions of the reverse spiral blade and the right-hand pushing cone wheel correspond to the forward bin and the reverse bin respectively.

[0014] It is further configured as follows: the spiral direction of the reverse spiral sheet is opposite to the spiral direction of the right-hand pushing cone wheel and the conveying screw.

[0015] It is further configured as follows: the fixed mounting block and the cooperating push block are slidably connected, and a connecting spring is provided between the fixed mounting block and the cooperating push block, the cooperating push block is arranged in an internal position corresponding to the reverse bin, and the cooperating push block is slidably connected in the built-in material tube.

[0016] It is further configured as follows: an air channel is opened in the conveying screw, one end of the air channel passes through one end of the corresponding driving assembly of the conveying screw, and the other end of the air channel extends to the inside of the corresponding cooperative push block, and an air port is opened on the outer wall position of the inside of the corresponding cooperative push block of the conveying screw.

[0017] The present invention has the following beneficial effects:

[0018] 1. The overall structure is based on the conveying pipeline for the raw material conveying process during the processing of plastic products. It does not change the conventional raw material conveying method. The key is to set up a built-in material pipe between the conventional preheating section and the melting section. The built-in material pipe will not actively participate in or interfere with the raw material transmission process, but will serve as a temporary storage structure for the raw materials. More specifically, the built-in material pipe completes the three steps of initial storage, melting, and reverse feeding of the raw materials. The purpose is to "separate" the process of switching the raw materials from solid to liquid from the overall environment inside the conveying pipeline, avoid the difference in the extrusion amount of raw materials generated when the two forms are switched, and specifically reduce the difference in the extrusion amount generated when the solid-liquid form is converted, and the overall structure still maintains continuity during operation;

[0019] 2. Based on the above content, it is explained again that the right-hand pushing cone wheel and the reverse spiral blade are added inside the built-in material pipe, the purpose of which is to cooperate with the backflow of the raw materials to achieve the effect of "acceleration", and the right-hand pushing cone block is used to compress the liquid raw materials. The overall structure is coordinated with the action of isolating and replenishing air in the airway, which is used to actively change the volume change inside the right-hand bin, thereby indirectly controlling the extrusion amount of liquid raw materials inside the right-hand bin by limiting the amount of air replenishment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 This is a structural schematic diagram of a quantity-controlled conveying assembly for processing plastic product raw materials proposed by the present invention;

[0022] Figure 2 A controlled delivery assembly for processing raw materials of plastic products proposed by the present invention Figure 1 sectional view of

[0023] Figure 3 It is a partial cross-sectional view of a conveying pipeline in a controlled quantity conveying assembly for processing plastic product raw materials proposed by the present invention;

[0024] Figure 4 This is a disassembled diagram of a built-in material pipe in a controlled quantity conveying assembly for processing raw materials of plastic products proposed by the present invention;

[0025] Figure 5 A controlled delivery assembly for processing raw materials of plastic products proposed by the present invention Figure 4 sectional view of

[0026] Figure 6 This is a partial cross-sectional view of a feeding screw in a controlled delivery assembly for processing raw materials of plastic products proposed by the present invention.

[0027] In the figure: 1. Drive assembly; 2. Material bin; 3. Conveying pipeline; 4. Reflux pipeline; 5. Material change pipeline; 6. Reverse material pipeline; 7. Conveying screw; 8. Drive motor; 9. Internal material pipe; 10. Material distribution fan blade; 11. Right-hand push cone wheel; 12. Cooperative push block; 13. Fixed mounting block; 14. Reverse spiral blade; 15. Connecting spring; 16. Airway. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Embodiment 1: With regard to the raw material conveying process in the production process of plastic products, the conventional screw feeding method is essentially a continuous feeding method, in which there is a solid-liquid switching process, which indirectly affects the difference in the amount of raw materials injected into the mold, such as raw material waste or reduced molding quality. The following technical solutions are proposed:

[0030] Reference Figures 1 to 6 In this embodiment, a controlled quantity conveying assembly for processing raw materials of plastic products comprises a driving assembly 1, a silo 2 and a conveying pipeline 3. A conveying screw 7 corresponding to the driving assembly 1 is arranged inside the conveying pipeline 3, and an internal material pipe 9 is installed at one end of the conveying pipeline 3;

[0031] A reverse spiral sheet 14 and a right-handed pushing cone wheel 11 are sequentially installed from left to right on the inner position of the conveying screw 7 corresponding to the inner position of the built-in material tube 9, a fixed mounting block 13 is installed on the inner wall position of the built-in material tube 9 corresponding to the middle position of the reverse spiral sheet 14 and the right-handed pushing cone wheel 11, and a cooperative pushing block 12 which is slidably connected to the conveying screw 7 is arranged on one side position of the fixed mounting block 13 corresponding to the right-handed pushing cone wheel 11;

[0032] A reflux pipe 4, a material exchange pipe 5 and a reverse material pipe 6 are installed at the position of the conveying pipe 3 corresponding to the built-in material pipe 9. The left and right positions of the conveying pipe 3 corresponding to the built-in material pipe 9 are respectively set as a melting bin and a preheating bin. The left and right side areas of the built-in material pipe 9 corresponding to the fixed mounting block 13 are respectively set as a forward bin and a reverse bin. A material port for the silo 2 is provided on the conveying pipe 3, and the conveying pipe 3 is respectively provided with a preheating section and a melting section along the direction from right to left. The built-in material pipe 9 is arranged in the middle position of the preheating section and the melting section. The material exchange pipe 5 is installed above the conveying pipe 3, and the left end of the material exchange pipe 5 passes through the conveying pipe 3 and the built-in material pipe 9 respectively and is connected with the inside of the forward bin, and the right end of the material exchange pipe 5 passes through the conveying pipe 3 and is connected with the inside of the preheating bin.

[0033] Working principle: For the production of plastic products, its essence is to use the principle of screw feeding for continuous feeding. Figure 2 For example, the driving assembly 1 provides power to the conveying screw 7 to make it rotate at a constant speed, thereby driving the raw material to be continuously conveyed from right to left. In addition, the preheating section and the melting section are conventional technologies in the art and are not described in detail in the present invention.

[0034] It should be noted that: an internal material pipe 9 is added to the junction of the preheating section and the melting section of the conveying pipeline 3, such as Figure 2 As shown, after the raw material is continuously conveyed to the right side of the built-in feeding pipe 9, it is difficult to continue conveying, so it can only be conveyed upward from the right side of the material exchange pipe 5, and returned to the left bin in the built-in feeding pipe 9 and subjected to a high temperature environment to convert the solid raw material into liquid raw material, and it can also be conveyed to the right bin through the reflux pipe 4, and finally returned to the left side of the built-in feeding pipe 9 through the material exchange pipe 6, and extruded through the conveying screw 7. It can be understood that the built-in feeding pipe 9 will not destroy the continuity of the raw material conveying, but only serves as a temporary storage structure when the raw material switches its form.

[0035] Embodiment 2: Supplementary explanation of the process of changing solid raw materials in the material changing pipeline:

[0036] The cross-section of the material exchange pipeline 5 is in a herringbone shape, and a material distribution fan blade 10 is rotatably installed at the middle end of the material exchange pipeline 5, and a driving motor 8 corresponding to the material distribution fan blade 10 is installed at the outer position of the material exchange pipeline 5. The backflow pipeline 4 is arranged in a circular array along the center point of the conveying pipeline 3, and both ends of the backflow pipeline 4 penetrate the conveying pipeline 3 to the interior of the built-in material pipe 9, and the two ends of the backflow pipeline 4 correspond to the forward bin and the reverse bin respectively. One end of the back material pipeline 6 is connected to the interior of the reverse bin, and the other end of the back material pipeline 6 is connected to the interior of the melting bin. The setting positions of the reverse spiral blade 14 and the right-hand pushing cone wheel 11 correspond to the forward bin and the reverse bin respectively, and the spiral direction of the reverse spiral blade 14 is opposite to the spiral direction of the right-hand pushing cone wheel 11 and the conveying screw 7.

[0037] Solution description: Combined with the basic structure of the conveying screw 7, as shown in the first embodiment, because the solid raw material is continuously docked at the right position of the corresponding material exchange pipe 5, part of the raw material slides upward along the pipe wall of the material exchange pipe 5 for transportation. In this process, it is necessary to cooperate with the drive motor 8 to drive the material distribution fan 10 to rotate counterclockwise, thereby continuing to drive part of the raw material into the left bin;

[0038] It should be noted that the reverse spiral blade 14 and the right-hand push cone wheel 11 rotate at the same speed as the conveying screw 7, but the reverse spiral blade 14 pushes the raw material from left to right. Similarly, the right-hand push cone wheel 11 and the conveying screw 7 push the raw material from right to left. Because a fixed mounting block 13 is provided between the left bin and the right bin, the two raw material conveying directions will not actively interfere with each other. The reverse spiral blade 14 functions to continuously squeeze the raw material. Because the fixed mounting block 13 is fixedly installed, in addition, the integral built-in material pipe 9 is in the melting section, so that the raw material can be switched from solid to liquid. It should be further explained that:

[0039] Combined with the continuous rotation of the conveying screw 7 and the reverse spiral blade 14, the liquid raw material enters the right bin along the reflux pipe 4. Although there is no obvious connection between the right bin, the left bin and the inside of the conveying pipe 3, the thrust generated by the continuous action of multiple structures ensures that the raw material first enters the right side of the conveying pipe 7, then enters the left bin in the built-in material pipe 9, then enters the right bin in the built-in material pipe 9, and finally returns to the left side of the conveying pipe 3. Therefore, the built-in material pipe 9 will not interfere with the conveying process of the raw material.

[0040] Embodiment 3: This embodiment provides additional explanation for the extrusion process of liquid raw materials:

[0041] There is a sliding connection between the fixed mounting block 13 and the cooperating push block 12, and a connecting spring 15 is provided between the fixed mounting block 13 and the cooperating push block 12. The cooperating push block 12 is arranged in an internal position corresponding to the reverse bin, and the cooperating push block 12 is slidably connected in the built-in material tube 9. An air channel 16 is opened in the conveying screw 7, one end of the air channel 16 passes through one end of the conveying screw 7 corresponding to the driving assembly 1, and the other end of the air channel 16 extends to the interior of the corresponding cooperating push block 12, and an air port is opened on the outer wall position of the conveying screw 7 corresponding to the interior of the cooperating push block 12.

[0042] Solution description: In combination with the second embodiment, the raw material will be completely filled in the conveying pipe 3 and the built-in material pipe 9, so that the continuity of the raw material conveying process can be met. However, the difference from the conventional method is that the volume inside the left warehouse and the conveying pipe 7 is a fixed value, while the volume inside the right warehouse is a variable value. This is explained as follows:

[0043] S1: When air is not supplied to the inside of the cooperative push block 12 through the air channel 16, and the liquid raw material is continuously injected into the right-hand bin 12, the cooperative push block 12 will show a tendency to move to the left until it moves to the maximum distance position, which is specifically manifested as the connecting spring 12 being compressed to the maximum amount. The explanation of the air supply action of the air channel 16 is that its essence is to connect a structure such as an air nozzle at one end of the conveying screw 7, because the conveying screw 7 needs to keep rotating continuously, so that the air nozzle and the conveying screw 7 keep rotating. The specific structure is not explained in detail in the present invention;

[0044] S2: In combination with the second embodiment and S1, when the liquid raw material is completely injected into the right bin, and because the liquid plastic raw material is easier to measure the relevant volume and mass, in this embodiment, active gas replenishment can be performed through the air channel 16, and the injected gas will not affect the liquid plastic raw material in the right bin, thereby forming an isolated gas replenishment method;

[0045] In combination with the process parameters in the production process of plastic products, the air supply volume of the air channel 16 is limited according to the extrusion volume required in a single extrusion / blow molding. Specifically, the air supply volume is controlled to make the cooperative push block 12 move to the right to a corresponding distance, so that the volume of the right-hand bin can be reduced, so that the corresponding volume of liquid plastic raw materials can be extruded. When the air supply is isolated and started, the driving motor 8 can be further controlled to rotate the material distribution fan 10 to a certain angle, and the material distribution fan 10 can be used to completely close the material exchange pipeline 5, or the conveying screw 7 can be temporarily stopped or the speed of the conveying screw 7 can be reduced, so that only the thrust generated by the cooperative push block 12 exists in the built-in material pipe 9;

[0046] After completing a single extrusion action, the dividing fan 10 is deflected again to connect the inside of the material exchange pipeline 5, and the gas between the cooperative push block 12 and the fixed mounting block 13 is extracted by gradually venting the air to reset the cooperative push block 12. The purpose of this is to avoid the right-hand bin from being filled with gas and affecting the molding quality of subsequent plastic products.

[0047] In summary: improvements are made to the conveying process of injecting plastic raw materials into the mold. Without changing the method of continuous raw material conveying, an internal material pipe is set between the conventional preheating section and the melting section. Its essence is: the raw materials are continuously conveyed as the conveying screw continues to move, and the raw materials are initially stored, melted, and reversed in the corresponding internal material pipe. Specifically, the conversion process of the raw materials from solid to liquid is completed in the internal material pipe, and finally the liquid plastic raw material is extruded by isolating the air supply, and the raw materials are conveyed by the conveying screw at the same time. The overall method is to limit the amount of air supply to control the extrusion amount of the raw materials, specifically to reduce the difference in extrusion amount caused by the conversion between solid and liquid forms, and the overall structure still maintains continuity during operation.

[0048] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

[0049] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0050] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A controlled delivery assembly for processing raw materials of plastic products, comprising a drive assembly (1), a silo (2) and a delivery pipeline (3), characterized in that: The conveying pipeline (3) is provided with a conveying screw (7) corresponding to the driving assembly (1), and an internal material pipe (9) is installed at one end of the conveying pipeline (3); A reverse spiral blade (14) and a right-handed pushing cone wheel (11) are sequentially installed from left to right on the inner position of the conveying screw (7) corresponding to the internal position of the built-in material tube (9); a fixed mounting block (13) is installed on the inner wall position of the built-in material tube (9) corresponding to the reverse spiral blade (14) and the right-handed pushing cone wheel (11); and a cooperative pushing block (12) slidably connected to the conveying screw (7) is provided on a side position of the fixed mounting block (13) corresponding to the right-handed pushing cone wheel (11); A counterflow pipe (4), a material exchange pipe (5) and a reverse material pipe (6) are installed at the position of the conveying pipe (3) corresponding to the built-in material pipe (9); the left and right positions of the conveying pipe (3) corresponding to the built-in material pipe (9) are respectively set as a melting bin and a preheating bin; and the left and right side areas of the built-in material pipe (9) corresponding to the fixed installation block (13) are respectively set as a forward bin and a reverse bin.

2. A controlled quantity conveying assembly for processing plastic product raw materials according to claim 1, characterized in that: The conveying pipeline (3) is provided with a material port for the material bin (2), and the conveying pipeline (3) is provided with a preheating section and a melting section respectively from right to left, and the built-in material pipe (9) is arranged in the middle of the preheating section and the melting section.

3. A controlled delivery assembly for processing plastic product raw materials according to claim 1, characterized in that: The material exchange pipeline (5) is installed above the conveying pipeline (3), and the left end of the material exchange pipeline (5) passes through the conveying pipeline (3) and the built-in material pipe (9) respectively and is connected to the inside of the forward bin, while the right end of the material exchange pipeline (5) passes through the conveying pipeline (3) and is connected to the inside of the preheating bin.

4. A controlled delivery assembly for processing plastic product raw materials according to claim 1, characterized in that: The cross section of the material exchange pipeline (5) is in a herringbone shape, and a material distribution fan blade (10) is rotatably installed at the middle end of the material exchange pipeline (5), and a driving motor (8) corresponding to the material distribution fan blade (10) is installed at the outer position of the material exchange pipeline (5).

5. The amount-controlled conveying assembly for processing plastic product raw materials according to claim 1, characterized in that: The reverse flow pipe (4) is arranged in a circular array along the center point of the conveying pipe (3), and both ends of the reverse flow pipe (4) penetrate the conveying pipe (3) to the interior of the built-in material pipe (9), and the two ends of the reverse flow pipe (4) correspond to the forward bin and the reverse bin respectively, one end of the reverse material pipe (6) is connected to the interior of the reverse bin, and the other end of the reverse material pipe (6) is connected to the interior of the melting bin.

6. A controlled delivery assembly for processing plastic product raw materials according to claim 1, characterized in that: The reverse spiral blade (14) and the right-hand pushing cone wheel (11) are arranged at positions corresponding to the forward bin and the reverse bin respectively.

7. A controlled delivery assembly for processing plastic product raw materials according to claim 6, characterized in that: The spiral direction of the reverse spiral sheet (14) is opposite to the spiral direction of the right-hand pushing cone wheel (11) and the conveying screw (7).

8. The amount-controlled conveying assembly for processing plastic product raw materials according to claim 1, characterized in that: The fixed installation block (13) and the cooperative push block (12) are slidably connected, and a connecting spring (15) is provided between the fixed installation block (13) and the cooperative push block (12). The cooperative push block (12) is arranged in an internal position corresponding to the reverse bin, and the cooperative push block (12) is slidably connected in the built-in material tube (9).

9. The amount-controlled conveying assembly for processing plastic product raw materials according to claim 1, characterized in that: An air passage (16) is provided in the conveying screw (7), one end of the air passage (16) passes through one end of the driving assembly (1) corresponding to the conveying screw (7), and the other end of the air passage (16) extends to the inside of the corresponding cooperative push block (12), and an air port is provided on the outer wall of the inside of the corresponding cooperative push block (12) of the conveying screw (7).

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