High-precision feeding system

Abstract

The high-precision feeding system comprises a first production line, and the first production line comprises a feeding bin, a first primary conveyor, a first secondary conveyor and a first containing tank. The first primary conveyor and the first secondary conveyor are both connected with the feeding bin and the first containing tank. The first primary conveyor and the first secondary conveyor can independently convey materials from the feeding bin to the first containing tank, and the feeding precision of the first secondary conveyor is higher than that of the first primary conveyor. The first containing tank comprises one or more first weighing modules used for weighing materials entering the first containing tank through the first primary conveyor and / or the first secondary conveyor.

Description

Technical Field

[0001] The present application relates to the field of feeding equipment, and in particular to a high-precision feeding system. Background Art

[0002] In chemical reactions and chemical production, accurate control of the weight of each material involved in the reaction can effectively control the reaction process. However, in daily production processes, especially when the reactants are powders, it is difficult to control the feeding accuracy within 0.1%. At present, the feeding accuracy of existing feeding equipment on the market can mostly only reach 0.5%. The 0.5% feeding accuracy can easily cause inaccurate chemical stoichiometric ratios in the production process, which in turn leads to unqualified reactants or unstable product quality.

[0003] For example, when producing PI (polyimide) slurry, PMDA (pyromellitic anhydride) and ODA (diaminodiphenyl ether) need to be accurately added to the reactor, and the molar ratio of the two materials needs to be strictly controlled to 1:1, otherwise the properties of the materials may change. However, due to the lack of feeding accuracy, the existing feeding equipment is prone to over- or under-addition of PMDA, resulting in substandard product quality.

[0004] CN219964832U discloses an automatic feeding system for powder material delivery, which includes a powder material bulk bag delivery station, a metering buffer bin connected to the powder material bulk bag delivery station through a pipeline, and a nitrogen filtration system. The metering buffer bin is connected to a reactor pipeline. The metering buffer bin is provided with at least one set of weight sensors and a metering screw linked to the weight sensor.

[0005] The automatic feeding system for powder conveying disclosed in the above utility model patent controls the weight of the powder material to be released through a weight sensor set on the metering buffer bin and a metering screw linked to the weight sensor. However, the utility model does not disclose the specific structure of the metering screw, and the existing screw conveying device has insufficient feeding accuracy, which may still lead to inaccurate feeding weight. Utility Model Content

[0006] This application is made in view of the above-mentioned state of the prior art. The purpose of this application is to provide a high-precision feeding system, which can use a two-stage conveyor to achieve accurate feeding.

[0007] The present application provides a high-precision feeding system, which includes a first production line,

[0008] The first production line includes a feeding bin, a first primary conveyor, a first secondary conveyor, and a first buffer tank.

[0009] The first primary conveyor and the first secondary conveyor are both connected to the feeding bin and the first holding tank.

[0010] The first primary conveyor and the first secondary conveyor can independently convey materials from the feeding bin to the first holding tank, and the feeding accuracy of the first secondary conveyor is higher than that of the first primary conveyor.

[0011] The first holding tank includes one or more first weighing modules to weigh the weight of the material entering the first holding tank via the first primary conveyor and / or the first secondary conveyor.

[0012] In at least one possible embodiment, the high-precision feeding system further includes a second production line.

[0013] The second production line includes a second primary conveyor, a second holding tank and a second reactor connected in sequence,

[0014] The first production line further includes a first reaction kettle, and the first holding tank is connected to the first reaction kettle.

[0015] In at least one possible embodiment, the first primary conveyor and the first secondary conveyor are screw conveyors.

[0016] The minimum throughput of the first secondary conveyor is lower than the minimum throughput of the first primary conveyor.

[0017] In at least one possible embodiment, the first production line further comprises a docking device, the docking device is connected to the first reactor, the docking device comprises a telescopic feeding pipe, the telescopic feeding pipe can extend into the interior of the first reactor; and / or

[0018] The second production line further comprises a docking device connected to the second reactor, wherein the docking device comprises a telescopic feeding pipe capable of extending into the interior of the second reactor.

[0019] In at least one possible embodiment, the first production line further includes an intermediate conveyor, and the intermediate conveyor is disposed between the first holding tank and the first reaction kettle; and / or

[0020] The second production line further includes an intermediate conveyor, and the intermediate conveyor is disposed between the second holding tank and the second reaction kettle.

[0021] In at least one possible implementation, the high-precision feeding system further includes a programmable logic controller.

[0022] In at least one possible embodiment, a first conveyor feed pipe is provided at the lower end of the feeding bin, and the conveyor feed port of the first-level conveyor and the conveyor feed port of the first-level conveyor are both connected to the first conveyor feed pipe.

[0023] The conveyor feed opening of the first secondary conveyor is located below the conveyor feed opening of the first primary conveyor, and / or

[0024] A valve is provided on the first conveyor feed pipe, and the valve is located between the conveyor feed port of the first primary conveyor and the conveyor feed port of the first secondary conveyor.

[0025] In at least one possible embodiment, the first holding tank includes three first weighing modules.

[0026] The three first weighing modules are evenly arranged on the outer circumference of the first containing tank.

[0027] In at least one possible embodiment, the high-precision feeding system further includes a pipeline, and at least one of the first holding tank and the pipeline is provided with an air hammer to reduce the phenomenon of material sticking to the wall.

[0028] The first primary conveyor and the first secondary conveyor are variable frequency conveyors.

[0029] In at least one possible embodiment, the first primary conveyor and the first secondary conveyor of the first production line are arranged in parallel on the same horizontal plane.

[0030] The first-stage conveyor and the first-stage conveyor share the same feeding bin discharge port and conveyor feed port.

[0031] The high-precision feeding system provided in the present application can achieve accurate feeding through a two-stage conveyor and in combination with a holding tank equipped with a weighing module. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic structural diagram of a high-precision feeding system according to the first embodiment of the present application.

[0033] Figure 2 for Figure 1 A cross-sectional view of the partial structure of the high-precision feeding system from an AA perspective.

[0034] Figure 3 for Figure 1 A cross-sectional view of a partial structure of the high-precision feeding system from a BB perspective.

[0035] Figure 4 for Figure 1A cross-sectional view of the partial structure of the high-precision feeding system from a CC perspective.

[0036] Figure 5 for Figure 1 A cross-sectional view of the partial structure of the high-precision feeding system from the DD perspective.

[0037] Figure 6 for Figure 1 Schematic diagram of the structure of the CITIC silo.

[0038] Figure 7 It is a schematic structural diagram of a high-precision feeding system according to the second embodiment of the present application.

[0039] Figure 8 for Figure 7 A cross-sectional view of the partial structure of the high-precision feeding system from an EE perspective.

[0040] Description of Reference Numerals

[0041] 10 Feeding silo

[0042] 11. First outlet

[0043] 12 Second outlet

[0044] 21 First level conveyor

[0045] 211 First conveyor feed port

[0046] 212 First conveyor feed pipe

[0047] 213 First conveyor discharge pipe

[0048] 22 Second level conveyor

[0049] 221 Second conveyor feed port

[0050] 31 First and second level conveyor

[0051] 41 First holding tank

[0052] 411 First weighing module

[0053] 412 First holding tank air hammer

[0054] 42 Second holding tank

[0055] 421 Second weighing module

[0056] 422 Second holding tank air hammer

[0057] 51 Intermediate conveyor

[0058] 61 Docking device

[0059] 611 Telescopic Feed Tube

[0060] 71 First Reactor

[0061] 72 Second Reactor

[0062] 81 Soft Link

[0063] 82 Butterfly Valve

[0064] 83 Ball valve

[0065] 84 Pipe support DETAILED DESCRIPTION

[0066] The exemplary embodiments of the present application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present application, and are not intended to exhaust all possible methods of the present application, nor to limit the scope of the present application.

[0067] It can be understood that the connection referred to in the present application may include direct connection and indirect connection, and the indirect connection may include communication through transition pieces such as pipes and hoses.

[0068] The embodiment of the present application provides a high-precision feeding system (hereinafter, sometimes referred to as "feeding system"), such as Figure 1 As shown, the feeding system may include a first production line (i.e. Figure 1 The first production line may include a feeding bin 10, a first primary conveyor 21, a first secondary conveyor 31, a first holding tank 41 and a first reaction kettle 71.

[0069] First embodiment

[0070] Specifically, the first primary conveyor 21 and the first secondary conveyor 31 can both independently convey materials. Figure 1 and Figure 6 As shown, the feeding bin 10 can form a first discharge port 11, and the first discharge port 11 can be connected to the first primary conveyor 21. Figure 1 and Figure 2 As shown, the first primary conveyor 21 may be formed with a first conveyor feed port 211, and the first conveyor feed port 211 may be connected to the first discharge port 11. The first primary conveyor 21 and the first secondary conveyor 31 may be staggered in height and arranged in parallel, extending in the horizontal direction. The first secondary conveyor 31 may be disposed below the first primary conveyor 21. The conveyor feed port of the first secondary conveyor 31 is also connected to the first discharge port 11. The conveyor discharge port of the first primary conveyor 21 and the conveyor discharge port of the first secondary conveyor 31 may be connected to the first holding tank 41 via the first conveyor discharge pipe 213.

[0071] Optionally, a first conveyor feed pipe 212 may be provided at the lower end of the feeding bin 10, and the conveyor feed port of the first primary conveyor 21 and the conveyor feed port of the first secondary conveyor 31 may both be connected to the first conveyor feed pipe 212. A valve, such as a butterfly valve or a ball valve (particularly a pneumatic butterfly valve and a pneumatic ball valve), may be provided on the first conveyor feed pipe 212, that is, between the conveyor feed port of the first primary conveyor 21 and the conveyor feed port of the first secondary conveyor 31, to control whether the material enters the first secondary conveyor 31.

[0072] It can be understood that when the conveyor feed port of the first primary conveyor 21 and the conveyor feed port of the first secondary conveyor 31 are connected via the first conveyor feed pipe 212, a valve can be set on the first conveyor feed pipe 212 to prevent the feeding processes of the first primary conveyor and the first secondary conveyor from interfering with each other and affecting the feeding accuracy. For example, when only the first primary conveyor is working, the above valve can prevent materials from falling into the first secondary conveyor 31; or when only the first secondary conveyor 31 is working, the above valve can prevent materials from mistakenly entering the first primary conveyor 21, especially when the minimum extrusion volume of the first secondary conveyor 31 is much smaller than that of the first primary conveyor 21.

[0073] Preferably, the first primary conveyor 21, the second primary conveyor 22 and the first secondary conveyor 31 can be screw conveyors. Furthermore, the feeding accuracy of the first secondary conveyor 31 can be greater than the feeding accuracy of the first primary conveyor 21, that is, the minimum extrusion amount of the first secondary conveyor 31 can be less than the minimum extrusion amount of the first primary conveyor 21. It can be understood that although the screw conveyor with a smaller minimum extrusion amount has higher accuracy, the feeding speed is slower. Therefore, in the early stage of the feeding operation, for example, the first 90% of the feeding process can use a primary conveyor with a larger minimum extrusion amount to ensure the speed of the feeding operation. In the later stage of the feeding operation, for example, the last 10% of the feeding process can use a secondary conveyor with a smaller minimum extrusion amount to improve the accuracy of the feeding operation.

[0074] It can be understood that the minimum extrusion amount (feeding accuracy) of the screw conveyor is related to the screw pitch, screw diameter, rotation speed and screw groove depth at the discharge end of the screw conveyor. For example, a screw conveyor with a larger screw diameter can be selected as a primary conveyor, and a screw conveyor with a smaller screw diameter can be selected as a secondary conveyor.

[0075] Preferably, the first primary conveyor 21 and the first secondary conveyor 31 can adopt a variable frequency design. That is, the first primary conveyor 21 and the first secondary conveyor 31 can include a variable frequency motor. It can be understood that the use of a variable frequency motor can more flexibly adjust the material conveying speed of the conveyor, and can better improve the problem of excessive feeding due to the working inertia of the conveyor.

[0076] The first secondary conveyor 31 can be connected to the first holding tank 41, in particular, via the first conveyor discharge pipe 213. Preferably, a butterfly valve 82 or a ball valve 83, in particular, a pneumatic butterfly valve and a pneumatic ball valve, can be provided between the first conveyor discharge pipe 213 and the first holding tank 41.

[0077] A soft connection 81 can also be set between the first conveyor discharge pipe 213 and the first holding tank 41 to reduce the impact of the vibration generated during the operation of the conveyor on the holding tank and other equipment. It can be understood that a soft connection is a pipe fitting used to connect powder processing equipment and pipelines, also known as a soft connection or flexible connection. Its main function is to compensate for the displacement and stress caused by the vibration of the equipment or pipeline and to convey the powder. Common materials for soft connections include canvas, silicone, thermoplastic polyurethane and polytetrafluoroethylene. The feeding system can also be equipped with soft connections at multiple locations such as pipelines according to actual needs.

[0078] The first holding tank 41 can receive and temporarily store materials transported by the first primary conveyor 21 and / or the first secondary conveyor 31. Figure 3 As shown, the first holding tank 41 may be provided with one or more first weighing modules 411. Exemplarily, the weighing module may be a compression weighing module, which may include a weighing sensor, a top plate, a bottom plate, etc. The weighing sensor is also a load cell, which can convert a mass signal into a measurable electrical signal and output it to a control system. It may be a photoelectric type, a hydraulic type, a capacitive type, a resistive strain type, etc. More preferably, the first holding tank 41 may be provided with three first weighing modules 411, and the three first weighing modules 411 may be evenly arranged on the periphery of the first holding tank 41. That is, adjacent first weighing modules 411 may form an angle of 120 degrees and form a three-point support for the first holding tank 41. It can be understood that this arrangement of the first weighing module 411 can give it better support and weighing accuracy.

[0079] It can be understood that the weighing module provided in the holding tank to weigh the weight of the material entering the holding tank has a smaller tare error and higher measurement accuracy than weighing the entire feeding system or reactor to measure the weight of the material. Preferably, the weight or volume of the first holding tank 41 can be adapted to the feeding amount of the feeding system to minimize the influence of the weight of the first holding tank 41 itself on the measurement accuracy.

[0080] Preferably, the feeding system may include a PLC controller (Programmable Logic Controller), which can receive the weighing information of the holding tank and the feeding information of the conveyor, and then accurately control the variable frequency feeding speed of the conveyor through the PID algorithm. The PID (PID is the abbreviation of Proportional, Integral, Differential) control algorithm is a control algorithm that combines the three links of proportional, integral and differential. This control method can greatly reduce the working error compared to manual operation. Exemplarily, in an experiment, the feeding accuracy of the feeding system can reach 0.1%.

[0081] like Figure 1 and Figure 5 As shown, the first holding tank 41 may be connected to the first reaction kettle 71 via a pipeline or the like.

[0082] Preferably, the pipeline between the first holding tank 41 and the first reaction kettle 71 may be provided with a flexible connection 81 and a valve body (particularly a butterfly valve 82).

[0083] Preferably, the first production line may also be provided with one or more air hammers to generate vibrations so that the material is not easily attached to the wall or blocked in the pipeline. It is understood that the air hammers may be provided in, for example, a holding tank, a pipeline, etc., and the specific location and number of the air hammers may be determined based on the properties of the material (especially fluidity, viscosity, etc.), the material and diameter of the pipeline, and other factors.

[0084] Further, such as Figure 1 As shown, the feeding system may also include a second production line (i.e. Figure 1 Specifically, the second production line and the first production line can share a feeding bin 10, such as Figure 1 and Figure 6 As shown, at this time, the feeding bin 10 can form a first discharge port 11 and a second discharge port 12. The first discharge port 11 can be connected to the first conveyor feed port 211, and the second discharge port 12 can be connected to the second conveyor feed port 221. The second production line may include a second primary conveyor 22, a second holding tank 42, and a second reactor 72.

[0085] It is understandable that Figure 3 As shown, the second holding tank 42 may also include one or more second weighing modules 421, in particular, three second weighing modules 421. The second holding tank 42 and its second weighing modules 421 may be the same or similar to the first holding tank 41 and its first weighing module 411, and will not be described in detail herein.

[0086] It can be understood that the feeding system can also include one or more extended production lines. The specific structure of the extended production line can be the same as or similar to the first production line or the second production line, and will not be repeated here.

[0087] It is understandable that the secondary conveyor may not be provided in the second production line to reduce the equipment cost of the feeding system when it is also responsible for feeding work with relatively low feeding accuracy requirements. However, it is not limited to this, and a second secondary conveyor may also be provided in the second production line.

[0088] Preferably, Figure 1 and Figure 4 As shown, an intermediate conveyor 51 may be further provided in the first production line and / or the second production line. For example, in this embodiment, an intermediate conveyor 51 is provided in the second production line, and the intermediate conveyor 51 may be provided between the second holding tank 42 and the second reactor 72. The intermediate conveyor may adjust the material discharge speed and the material discharge amount in the holding tank. For example, the conveying accuracy of the intermediate conveyor 51 may be greater than that of the primary conveyor and / or the secondary conveyor, so as to accurately feed materials in a process where materials need to be continuously added to the reactor.

[0089] It can be understood that for a process requiring continuous feeding, a second production line with an intermediate conveyor 51 can be used. The material can be continuously added to the second reactor through the high-precision intermediate conveyor 51, and the weight of the material added to the second reactor in the continuous feeding process can be calculated by the difference in the weight of the material in the second holding tank 42.

[0090] Preferably, a docking device 61 may be provided in the first production line and / or the second production line, and the docking device 61 may be connected to the first reactor 71 and / or the second reactor 72, and in particular, may be connected to the end of the pipe connecting the holding tank to the reactor. Exemplarily, in this embodiment, a docking device 61 may be provided in the second production line. The docking device 61 may include a retractable feeding pipe 611, which may extend below the material surface of the second reactor 72 to reduce dust from the powdered material and prevent part of the material from adhering to the reactor cover, etc. The retractable feeding pipe 611 may be provided with a valve body, in particular a butterfly valve 82 or a ball valve 83.

[0091] Preferably, the docking device 61 may include a cylinder, through which the telescopic movement of the telescopic feeding tube 611 can be controlled.

[0092] Preferably, the feeding system may include a plurality of pipe supports 84, and the pipe supports 84 may be used to connect the pipes of the feeding system to a support structure such as a support, so as to fix the pipes and the entire feeding system.

[0093] It can be understood that some specific parameters of the feeding system, such as the angle of repose, cleanliness, etc., can be specifically determined according to the type and properties of the material.

[0094] An exemplary workflow of the high-precision feeding system provided in this embodiment is briefly introduced below.

[0095] The first level conveyor 21 of the first production line is turned on to start feeding materials into the first holding tank 41. When the feeding amount reaches 90% of the predetermined value, the first level conveyor 21 can be turned off and the first level conveyor 31 can be turned on. The first level conveyor 31 will take on the last 10% of the feeding work. In the process of the material entering the first holding tank 41, its first weighing module 411 will promptly feedback the material weight to the PLC, and regulate the working status of the first level conveyor and the first level conveyor. When the material in the first holding tank 41 reaches the predetermined value, the valve (butterfly valve) under the holding tank is opened, and the material is put into the first reactor 71 through the pipeline. The air hammer set in the system can generate vibration to make the material sticking to the wall (hanging on the wall) fall into the first reactor. If a second production line or an extended production line is set, its working method is similar to that of the first production line, which will not be repeated here.

[0096] Second embodiment

[0097] Refer to the following Figure 7 and Figure 8 A second embodiment according to the present application will be described. Components having the same or similar structures or functions as those in the first embodiment are denoted by the same reference numerals, and detailed descriptions of these components will be omitted.

[0098] like Figure 7 and Figure 8 As shown, the first primary conveyor 21 and the first secondary conveyor 31 of the first production line can be arranged in parallel on the same horizontal plane (that is, the first conveyor and the second conveyor are arranged in parallel with a certain interval in a horizontal plane). The conveying accuracy of the first primary conveyor 21 and the first secondary conveyor 31 is different. For example, the conveying accuracy of the first secondary conveyor 31 can be higher than that of the first primary conveyor 21. The first primary conveyor 21 and the first secondary conveyor 31 can share the same feeding bin discharge port and conveyor feed port ( Figure 8 The first conveyor feed port 211) and the conveyor discharge port in the conveyor are controlled by respectively operating the first conveyor or the second conveyor to control the feeding accuracy of the system. The conveyor discharge port can be connected to the first holding tank 41 via a valve body (butterfly valve or ball valve) and / or a soft connection.

[0099] like Figure 7As shown, the first holding tank 41 and the second holding tank 42 may be respectively provided with a first holding tank air hammer 412 and a second holding tank air hammer 422. A ball valve and / or a flexible connection may be provided downstream of the first holding tank 41 of the first production line.

[0100] The high-precision feeding system provided in this embodiment can be applied to a variety of working conditions. Several examples of applicable working conditions are given below.

[0101] In such Figure 1 and Figure 7 In the high-precision feeding system shown, its first production line can be applied to production processes that do not require continuous feeding (i.e., can be fed in one go). The first-level conveyor and the first-level conveyor of the first production line cooperate with the first holding tank with a weighing function, so that the first production line has a higher one-time feeding accuracy. The second production line of the high-precision feeding system can be applied to production processes that require continuous feeding. The second-level conveyor and the intermediate conveyor of the second production line cooperate with the second holding tank with a weighing function, so that the second production line has a higher continuous feeding accuracy. At the same time, the two-stage conveyor of the first production line is more suitable for the transportation of materials with smaller particle sizes (for example, particle sizes of 0.5mm to 5mm) or flaky granular materials.

[0102] Furthermore, in the first embodiment, the first-stage conveyor and the first-stage conveyor are arranged in a staggered form in height, which can be applied to most solid powder material conveying processes. In the second embodiment, the first-stage conveyor and the first-stage conveyor are arranged in parallel on a horizontal plane and share the conveyor feed port and the conveyor discharge port, that is, a mother-and-child conveyor, which can be particularly suitable for material conveying conditions with strict requirements on process conditions. It can be understood that the staggered arrangement of the two-stage conveyor in height will increase the number of connectors and interfaces, which will increase the dead angle area of ​​the conveyor device and easily leave residual materials. The mother-and-child conveyor can relatively improve the sealing of the conveyor, reduce dead angles and material residues, and at the same time, the structure of the mother-and-child conveyor is also convenient for improving its inner surface roughness and other manufacturing precision parameters, so that it can be applied to material conveying conditions of special materials, such as sodium hydroxide, paraphenylenediamine (PDA), and other materials that may be easily oxidized, easily hydrolyzed, and easily deteriorated at high temperature.

[0103] Several experimental cases of this embodiment are given below.

[0104] Experimental Case 1

[0105] 250kg of PMDA (pyromellitic anhydride) is added, and the accuracy of traditional feeding equipment is usually 250kg±1250g. The feeding system provided by this embodiment can make the feeding accuracy of each batch reach 250kg±250g under laboratory conditions, that is, the feeding system is 5 times the feeding accuracy of traditional equipment. At the same time, due to the improved feeding accuracy, the slurry viscosity of the produced PI (polyimide) product is increased from 5000~30000cP (centipoise) to 8000~14000cP, which greatly improves the product stability (the viscosity of qualified PI products is 10000±5000cP).

[0106] Experimental Case 2

[0107] When feeding 40kg of PMDA, the accuracy of traditional feeding equipment is usually 40kg±200g. Using the feeding system provided in this embodiment, the feeding accuracy of each batch can reach 40kg±10g under laboratory conditions, that is, the feeding system is 20 times the feeding accuracy of traditional equipment. At the same time, due to the improved feeding accuracy, the slurry viscosity of the produced PI product is increased from 7000~20000cP to 8000~12000cP, which significantly improves the product quality and the quality stability of each batch of products.

[0108] The following briefly describes some of the beneficial effects of the above-mentioned embodiments of the present application.

[0109] 1. The high-precision feeding system provided in the embodiment of the present application includes a primary conveyor and a secondary conveyor. By using screw conveyors with different feeding precisions at the right time, the feeding precision can be improved while reducing the impact on the feeding speed. That is, a primary conveyor with a larger minimum extrusion volume (i.e., a larger feeding volume) and lower precision can be used in the early feeding, and a secondary conveyor with a smaller minimum extrusion volume (i.e., a smaller feeding volume) and higher precision can be used in the later feeding period.

[0110] 2. The high-precision feeding system provided in the embodiment of the present application also includes a number of technical features that can improve the feeding accuracy, including: a. A holding tank is provided for weighing the feeding amount of the conveyor, and three weighing modules can be evenly arranged in the holding tank. b. A docking device is provided at the end of the feeding pipe entering the reactor, and the docking device includes a retractable feeding pipe that can be extended below the material surface, which can reduce powder dust and powder adhesion. c. A variable frequency conveyor and PLC are used to control the feeding process, and the variable frequency feeding process of the conveyor is accurately controlled by the PID algorithm.

[0111] 3. The high-precision feeding system provided in the embodiments of the present application can be set up with one or more production lines according to actual production needs, and can combine the aforementioned various technical features that can improve the feeding accuracy, so that the feeding system can be more flexible to adapt to various working conditions. The high-precision feeding system can effectively improve the feeding accuracy of materials, especially the feeding accuracy of powdered materials, thereby improving the quality of products and the stability between batches of products.

[0112] It is understood that in the present application, when the number of parts or components is not particularly limited, the number may be one or more, and the multiple here means two or more. For the case where the number of parts or components shown in the drawings and / or described in the specification is a specific number such as two, three, four, etc., the specific number is usually exemplary and not restrictive, and it can be understood as multiple, that is, two or more, but this does not mean that the present application excludes the case of one.

[0113] It should be understood that the above embodiments are merely exemplary and are not intended to limit the present application. Those skilled in the art may make various modifications and changes to the above embodiments under the guidance of the present application without departing from the scope of the present application.

Claims

1. A high-precision feeding system, characterized in that: Including the first production line, The first production line includes a feeding bin, a first primary conveyor, a first secondary conveyor, and a first holding tank. The first primary conveyor and the first secondary conveyor are both connected to the feeding bin and the first holding tank. The first primary conveyor and the first secondary conveyor can independently convey materials from the feeding bin to the first holding tank, and the feeding accuracy of the first secondary conveyor is higher than that of the first primary conveyor. The first holding tank includes one or more first weighing modules to weigh the weight of the material entering the first holding tank via the first primary conveyor and / or the first secondary conveyor.

2. The high-precision feeding system according to claim 1, characterized in that: It also includes a second production line, The second production line includes a second primary conveyor, a second holding tank and a second reactor connected in sequence, The first production line further includes a first reaction kettle, and the first holding tank is connected to the first reaction kettle.

3. The high-precision feeding system according to claim 1, characterized in that: The first primary conveyor and the first secondary conveyor are screw conveyors, The minimum throughput of the first secondary conveyor is lower than the minimum throughput of the first primary conveyor.

4. The high-precision feeding system according to claim 2, characterized in that: The first production line further comprises a docking device, the docking device is connected to the first reactor, the docking device comprises a telescopic feeding pipe, the telescopic feeding pipe can extend into the interior of the first reactor; and / or The second production line further comprises a docking device connected to the second reaction kettle, wherein the docking device comprises a telescopic feeding pipe capable of extending into the interior of the second reaction kettle.

5. The high-precision feeding system according to claim 2, characterized in that: The first production line further includes an intermediate conveyor, wherein the intermediate conveyor is disposed between the first holding tank and the first reaction kettle; and / or The second production line further includes an intermediate conveyor, and the intermediate conveyor is disposed between the second holding tank and the second reaction kettle.

6. The high-precision feeding system according to claim 1, characterized in that: Also included is a programmable logic controller.

7. The high-precision feeding system according to claim 1, characterized in that: A first conveyor feed pipe is provided at the lower end of the feeding bin, and the conveyor feed port of the first-level conveyor and the conveyor feed port of the first-level conveyor are both connected to the first conveyor feed pipe. The conveyor feed opening of the first secondary conveyor is located below the conveyor feed opening of the first primary conveyor, and / or A valve is provided on the first conveyor feed pipe, and the valve is located between the conveyor feed port of the first primary conveyor and the conveyor feed port of the first secondary conveyor.

8. The high-precision feeding system according to claim 1, characterized in that: The first holding tank includes three of the first weighing modules, The three first weighing modules are evenly arranged on the outer circumference of the first containing tank.

9. The high-precision feeding system according to claim 1, characterized in that: It also includes a pipeline. At least one of the first holding tank and the pipeline is provided with an air hammer to reduce the phenomenon of material sticking to the wall. The first primary conveyor and the first secondary conveyor are variable frequency conveyors.

10. The high-precision feeding system according to claim 1, characterized in that: The first-level conveyor and the first-level conveyor of the first production line are arranged in parallel on the same horizontal plane, and the first-level conveyor and the first-level conveyor share the same feeding bin discharge port and conveyor feed port.

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