CN115814671A

CN115814671A - Powder conveying device, control method thereof and battery slurry production equipment

Info

Publication number: CN115814671A
Application number: CN202210563338.2A
Authority: CN
Inventors: 高楠
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2022-05-20
Filing date: 2022-05-20
Publication date: 2023-03-21

Abstract

The application relates to a powder conveying device, a control method thereof and battery slurry production equipment, which comprises the following steps: the device comprises a premixing unit, a first injection unit, a second injection unit and a conveying unit, wherein the premixing unit comprises a premixing container and a mixing mechanism, the first injection unit and the second injection unit are respectively used for injecting a solvent and powder into the premixing container, the mixing mechanism is used for mixing the powder and the solvent in the premixing container to form a mixed solution, and the conveying unit is communicated with the premixing container and used for conveying the mixed solution. The solvent is used as a carrier to convey the powder, so that the problem that the powder is easy to rub and discharge in pneumatic transportation and is combusted and exploded can be avoided. Meanwhile, the solvent can enter a downstream process without being separated from the powder, the problem of solvent emission does not exist, the problem of ventilation requirement of an emission environment does not exist, and the method is suitable for the existing plant. In addition, the conveying of the powder is realized, the solvent and the powder are pre-mixed, and the mixing efficiency of a downstream stirring process can be improved.

Description

Powder conveying device, control method thereof and battery slurry production equipment

Technical Field

The application relates to the technical field of battery manufacturing equipment, in particular to a powder conveying device, a control method of the powder conveying device and battery slurry production equipment.

Background

The combustible powder is easy to generate static electricity in the conveying process, and the minimum ignition energy is low, so that the powder is easy to explode in the conveying process. In the related art, nitrogen is generally used for conveying combustible powder. The mode of nitrogen gas transport combustible powder needs the factory building to possess corresponding ventilation function, can't directly be applied to the relatively poor current factory building of air permeability, if be applied to current factory building and need ventilate to reform transform it, powder transport cost is higher.

Disclosure of Invention

In view of the above problems, the application provides a powder conveying device, a control method thereof and battery slurry production equipment, which can be adapted to the existing factory building with poor ventilation performance and reduce the powder conveying cost.

In a first aspect, the application provides a powder conveying device, which comprises a premixing unit, a first injection unit, a second injection unit and a conveying unit, wherein the premixing unit comprises a premixing container and a mixing mechanism, the first injection unit and the second injection unit are respectively used for injecting a solvent and powder into the premixing container, the mixing mechanism is used for mixing the powder and the solvent in the premixing container to form a mixed solution, and the conveying unit is communicated with the premixing container and used for conveying the mixed solution.

In the technical scheme of this application embodiment, through with the powder and the solvent carry the powder after premixing, use the solvent to carry the powder as the carrier, can avoid the powder to rub easily in air transport and discharge and the problem of burning explosion. Meanwhile, the solvent is used as a carrier to convey the powder, the solvent can enter a downstream process without being separated from the powder, the problem of solvent emission does not exist, the problem of ventilation requirement of an emission environment does not exist, and the method is suitable for the existing factory buildings. In addition, the solvent is used as a carrier to convey the powder, so that the solvent and the powder can be mixed in advance while the powder is conveyed, and the mixing efficiency of a downstream stirring process can be improved.

In some embodiments, the first injection unit includes a first flow meter and a first switch member communicatively coupled to define a first measured value as the flow rate of the solvent flowing through the first flow meter. The first switch member is configured to interrupt communication between the solvent source and the premix container when the first measurement reaches a first predetermined amount. Therefore, the quantitative injection of the solvent can be realized, the proportion of the mixed solution obtained by mixing in the premixing container can be kept consistent, the required solvent content can be conveniently and accurately injected into the downstream stirring process, and the stability of the proportion of substances in the mixture obtained by the downstream stirring process is ensured.

In some embodiments, the second injection unit comprises a dosing vessel and a dosing member in communication between the dosing vessel and the premix vessel. The feeding container is used for receiving powder, and the quantitative piece is used for conveying powder with set content to the premixing container. At the moment, the quantitative part is used for conveying the quantitative powder to the premixing container, so that the proportion of the mixed solution obtained by mixing in the premixing container can be kept consistent every time, the required powder content can be conveniently and accurately injected into the downstream stirring process, and the stability of the proportion of substances in the mixture obtained in the downstream stirring process is ensured.

In some embodiments, the dosing member includes a housing and a dosing disc rotatably disposed in the housing, the housing having an inlet and an outlet communicating with an interior of the housing, the inlet communicating with the feeding container, and the outlet communicating with the premixing container. The quantitative tray separates the inside of casing and forms a plurality of quantitative districts relative self axial symmetry, and when the quantitative tray was in the rotation, each quantitative district homoenergetic switched between the pan feeding position that sets up towards the import and the ejection of compact position that sets up towards the export. Therefore, the powder can be metered by controlling the rotation angle of the metering disc, and the metering mode is simple.

In some embodiments, the delivery unit includes a delivery line, a second switch member, and a second flow meter, the delivery line communicates with the outlet of the premix vessel, and the second switch member and the second flow meter are both located in the delivery line. The second switch component is in communication connection with the second flow meter, and is used for defining the flow of the mixed solution flowing through the conveying pipeline and measured by the second flow meter as a second measured value, and cutting off the conveying pipeline when the second measured value reaches a second preset value. Thus, the quantitative conveying of the mixed solution is realized, the quantitative injection of the mixed solution by the stirring device in the downstream stirring process can be ensured, and the stability of the material proportion in the mixture obtained in the downstream stirring process can be further ensured.

In some embodiments, the second switch member includes a pump body communicatively connected to the second flow meter, the pump body is disposed in the delivery line and located upstream of the second flow meter, the pump body is configured to provide power for the mixed solution to flow in the delivery line, the pump body switches on the delivery line when operating, and the pump body switches off the delivery line when stopping. At the moment, the pump body can provide power for the mixed solution to accelerate the flow of the liquid, the mixed solution can be smoothly conveyed to the outside, the installation position of the second conveying pipeline is not limited, and the layout is more flexible. Meanwhile, the pump body can be used as a switch component to conduct or cut off the conveying pipeline, so that the cost can be reduced and the structure can be simplified.

In some embodiments, the pump body is configured to adjust its pumping speed according to a second preset quantity in relation to a second measured value measured in real time by the second flow meter. At this moment, the pump body can be according to the output volume real-time regulation self pumping speed of mixed solution, can enough accelerate the transport of mixed solution in the transport earlier stage, improves transport efficiency, can slow down the speed of mixed solution in the transport later stage again, improves the accuracy nature that mixed solution carried content.

In some embodiments, the switch member further comprises an outlet valve communicatively connected to the second flow meter, the outlet valve being disposed in the delivery line downstream of the second flow meter, the outlet valve being configured to adjust its opening based on a relationship between the second predetermined quantity and a second measured value of the second flow meter measured in real time. At the moment, the outlet valve can adjust the pumping speed of the outlet valve in real time according to the output quantity of the mixed solution, the outlet valve can be used for conveying the large-flow mixed solution in the early stage of conveying, the conveying efficiency is improved, the conveying of the mixed solution can be slowed down in the later stage of conveying, and the accurate control of the conveying content of the mixed solution is ensured. In addition, the outlet valve can prevent the outlet of the conveying pipeline from leaking and dripping.

In some embodiments, the premixing unit further comprises a liquid level detecting part, the liquid level detecting part is used for detecting the liquid level of the premixing container, the liquid level detecting part is in communication connection with the first injection unit and the second injection unit, and the first injection unit and the second injection unit are used for injecting the solvent and the powder into the premixing container respectively when the liquid level of the premixing container is lower than a preset liquid level. At the moment, the liquid level of the mixed solution in the premixing container is detected through the liquid level detection piece, the solvent and the solution can be supplemented in time when the liquid level is insufficient, the flow requirement of conveying the mixed solution to the outside at every time is met, and the proportion accuracy of the mixed substance in the downstream stirring process is guaranteed.

In some embodiments, the powder conveying device further comprises a dust removing unit, wherein the dust removing unit comprises a negative pressure device and a dust remover, the dust remover is communicated between the negative pressure device and the second injection unit, and the negative pressure device is used for generating suction force for promoting the flying dust in the second injection unit to enter the dust remover. At the moment, the dust generated in the second injection unit is collected and treated by the dust removal unit, so that the dust can be prevented from overflowing, and the environment is protected.

In some embodiments, the dust remover has a dust removal chamber and a fire valve, the dust removal chamber communicates with the negative pressure device and the second injection unit, the fire valve switches on or cuts off communication between the fire extinguishing agent source and the dust removal chamber, a temperature sensor is disposed in the dust removal chamber, the temperature sensor is in communication connection with the fire valve, and when the temperature measured by the temperature sensor reaches a preset temperature, the fire valve switches on the fire extinguishing agent source and the dust removal chamber. At the moment, by arranging the fire extinguishing valve and the temperature sensor, the fire can be extinguished in time when the dust in the dust removing cavity is on fire, and larger safety accidents are avoided.

In some embodiments, the dust removal unit further comprises a filter, the filter communicating between the negative pressure collector and the dust remover. At the moment, the filter is arranged between the negative pressure device and the dust remover, so that secondary filtration can be carried out on air, dust is prevented from being discharged to the environment, and the environment is protected. And (5) effect.

In a second aspect, the present application provides a control method for a powder conveying device, comprising the following steps:

controlling a first injection unit to inject a solvent into the premix container;

controlling a second injection unit to inject powder into the premixing container;

starting a mixing mechanism to mix the solvent and the powder in the premixing container to obtain a mixed solution;

and controlling the conveying unit to convey the mixed solution.

According to the technical scheme, after the powder and the solvent are premixed, the solvent is used as a carrier to convey the powder, and the problem that the powder is easy to rub and discharge in pneumatic transportation and is combusted and exploded can be avoided. Meanwhile, the solvent is used as a carrier to convey the powder, the solvent can enter a downstream process without being separated from the powder, the problem of solvent emission does not exist, the problem of ventilation requirement of an emission environment does not exist, and the method is suitable for the existing factory buildings. In addition, the solvent is used as a carrier to convey the powder, so that the solvent and the powder can be pre-mixed while the powder is conveyed, and the mixing efficiency of a downstream stirring process can be improved.

In some embodiments, the step of controlling the first injection unit to inject the solvent into the premix vessel specifically comprises

Controlling a first switch member to conduct communication between the solvent source and the premix container, and obtaining a first measurement value, which is a flow rate of the solvent flowing through the first switch member measured by a first flow meter;

when the first measured value reaches a first preset amount, the first switching member is controlled to intercept the communication between the solvent source and the premix container. Therefore, the quantitative injection of the solvent can be realized, the proportion of the mixed solution obtained by mixing in the premixing container can be kept consistent, the required solvent content can be conveniently and accurately injected into the downstream stirring process, and the stability of the proportion of substances in the mixture obtained by the downstream stirring process is ensured.

In some embodiments, the step of controlling the second injection unit to inject the powder into the premix container specifically includes: and controlling the quantitative part to convey the powder with the set content to the premixing container. At the moment, the quantitative part is used for conveying quantitative powder to the premixing container, so that the proportion of the mixed solution obtained by mixing in the premixing container can be kept consistent every time, the required powder content can be conveniently and accurately injected into the downstream stirring process, and the stability of the proportion of substances in the mixture obtained in the downstream stirring process is ensured.

In some embodiments, the step of controlling the delivery unit to deliver the mixed solution specifically includes:

controlling a second switch component to conduct the conveying pipeline and obtaining a second measured value, wherein the second measured value is the flow of the mixed solution flowing through the conveying pipeline and measured by a second flowmeter;

and when the second measured value reaches a second preset value, controlling the second switching component to cut off the conveying pipeline.

Thus, the quantitative conveying of the mixed solution is realized, the quantitative injection of the mixed solution by the stirring device in the downstream stirring process can be ensured, and the stability of the material proportion in the mixture obtained in the downstream stirring process can be further ensured.

In some embodiments, before the step of controlling the first injection unit to inject the solvent into the premix vessel and the step of controlling the second injection unit to inject the powder into the premix vessel, the method further comprises:

and acquiring the liquid level of the premixing container from the liquid level detection piece, judging whether the liquid level of the premixing container is lower than a preset liquid level or not, and if so, executing the step of controlling the first injection unit to inject the solvent into the premixing container and the step of controlling the second injection unit to inject the powder into the premixing container.

So, detect the liquid level of mixing solution in the premix container through the liquid level detection spare, can in time supply solvent and solution when the liquid level is not enough to satisfy the flow requirement of carrying mixing solution to the outside at every turn, guarantee the proportion accuracy nature of misce bene in the low reaches stirring process, also can realize mixing solution's automation and prepare material, degree of automation is high.

In some embodiments, before the step of controlling the second injection unit to inject the powder into the premix container, the method further comprises:

and opening the negative pressure device to suck the flying dust in the second injection unit into the dust remover.

At the moment, the dust generated in the second injection unit is collected and treated by the dust removal unit, so that the dust can be prevented from overflowing, and the environment is protected.

In some embodiments, after the step of turning on the negative pressure device to suck the fugitive dust in the second injection unit into the dust collector, the method further includes:

when the temperature in the dust removal cavity of the dust remover measured by the temperature sensor reaches the preset temperature, the fire extinguishing valve is controlled to conduct the states of the fire extinguishing agent source and the dust removal cavity.

At the moment, by arranging the fire extinguishing valve and the temperature sensor, the fire can be timely extinguished when the dust in the dust removing cavity is on fire, and the greater safety accident is avoided.

In a third aspect, the present application provides a battery slurry production apparatus, which includes a stirring device and the powder conveying device in the above embodiments, wherein the conveying unit is used for conveying the mixed solution to the stirring device.

The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.

Drawings

Various additional advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Moreover, like reference numerals are used to refer to like elements throughout. In the drawings:

FIG. 1 is a schematic diagram of a system for a powder delivery apparatus according to some embodiments of the present disclosure;

FIG. 2 is a schematic diagram of a system of a powder delivery apparatus in other embodiments of the present application;

FIG. 3 is a system diagram of a second injection unit in some embodiments of the present application;

FIG. 4 is a schematic system view of a powder delivery apparatus according to further embodiments of the present application;

FIG. 5 is a flow chart of a method of controlling a powder delivery apparatus according to some embodiments of the present disclosure;

FIG. 6 is a detailed flowchart of step S100 in FIG. 5;

FIG. 7 is a detailed flowchart of step S200 in FIG. 5;

FIG. 8 is a detailed flowchart of step S400 in FIG. 5;

FIG. 9 is a flow chart illustrating a method of controlling a powder delivery apparatus according to further embodiments of the present disclosure;

FIG. 10 is a flow chart illustrating a method of controlling a powder delivery apparatus according to further embodiments of the present disclosure;

FIG. 11 is a flow chart illustrating a method of controlling a powder delivery apparatus according to further embodiments of the present disclosure;

fig. 12 is a system schematic of a battery slurry production facility in some embodiments of the present application.

The reference numerals in the detailed description are as follows:

1000. battery paste production equipment; 100. a powder conveying device; 110. a pre-mixing unit; 111. a premix vessel; 112. a mixing mechanism; 120. a first injection unit; 121. a first flow meter; 122. a first switch member; 130. a second injection unit; 131. a feeding container; 132. a dosing member; 132a, a housing; 132b, quantitative plate; v, a quantification zone; 140. a conveying unit; 141. a delivery line; 142. a second switch member; 142a, a pump body; 142b, an outlet valve; 143. a second flow meter; 150. a dust removal unit; 151. a negative pressure device; 152. a dust remover; 152a, a dust removal cavity; 152b, a fire valve; 153. a temperature sensor; 154. a filter; 200. and (4) a stirring device.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are merely used to more clearly illustrate the technical solutions of the present application, and therefore are only examples, and the protection scope of the present application is not limited thereby.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first", "second", and the like are used only for distinguishing different objects, and are not to be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary-secondary relationship of the technical features indicated. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is only one kind of association relationship describing an associated object, and means that three relationships may exist, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two), and "plural pieces" refers to two or more (including two).

In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the directions or positional relationships indicated in the drawings, and are only for convenience of description of the embodiments of the present application and for simplicity of description, but do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are used in a broad sense, and for example, may be fixedly connected, detachably connected, or integrated; mechanical connection or electrical connection is also possible; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.

Pneumatic conveying is a common combustible powder conveying mode. The pneumatic conveying refers to that gas is used as a carrier to drive powder to flow in a closed pipeline to finish conveying, and inert gas is usually selected for conveying combustible powder in order to avoid explosion caused by reaction with air. When combustible powder is conveyed pneumatically, nitrogen with lower cost is generally used for conveying. The purity of the nitrogen for conveying the combustible powder is very high, and suffocation danger is easily caused if the nitrogen is directly discharged to the environment with poor ventilation performance, so that the nitrogen conveying powder has a quite ventilation requirement on the nitrogen emptying environment.

The applicant notices that the ventilation performance of the existing plant can not meet the ventilation requirement when the combustible powder is conveyed by nitrogen generally, and if equipment for conveying the combustible powder by nitrogen is applied to the existing plant, the existing plant needs to be subjected to ventilation transformation, so that the powder conveying cost is higher. The applicant also noticed that during the production of the battery slurry, the combustible powder is conveyed to a stirring device and mixed with other powder and relevant solvents to obtain the battery slurry.

In order to solve the problem that the powder conveying cost is high due to the fact that the workshop needs to be ventilated and transformed when the combustible powder conveyed by nitrogen is applied to the existing workshop, the applicant researches and discovers that the combustible powder can be conveyed by liquid, specifically, the combustible powder can be conveyed by the solvent which is the same as the solvent used for preparing the battery slurry, the combustible powder is conveyed by the liquid and finally conveyed to a stirring device together, and the liquid is not required to be emptied, so that the requirement on the ventilation of the workshop is not high. Meanwhile, the solvent which is the same as that used for preparing the battery slurry can be used for conveying, the battery slurry is not polluted, and combustible powder and the solvent do not need to be separated, so that multiple purposes are achieved.

Based on the above consideration, when in order to solve nitrogen gas transport combustible powder and be applied to current factory building, because of need ventilating the transformation and leading to the fact the higher problem of powder transport cost to the factory building, the applicant has conducted deep research, a powder conveyor has been designed, inject solvent and powder into the premix container respectively through first injection unit and second injection unit, and utilize mixing mechanism to mix powder and solvent and form even mixed solution, mixed solution can be directly carried to agitating unit by the conveying unit, do not need to consider the explosion problem among the powder transportation process promptly, and also need not consider tail gas ventilation requirement problem, can be applied to current factory building, can also premix powder and solvent at last, kill many birds with one stone.

The powder conveying device provided by the application can be applied to conveying of powder (such as CMC (Carboxymethyl Cellulose)) used for preparing battery slurry, and can also be applied to conveying of powder used for preparing other slurries. The application provides a powder conveyor can be applied to the transport of combustible powder, also can be applied to the transport of non-combustible powder. The combustible powder material may be, but is not limited to: carboxymethyl Cellulose powder (CMC), low-density polyethylene powder (LDPE), polymethyl methacrylate Powder (PMMA), and the like. The solvent referred to herein may be, but is not limited to, N-methyl pyrrolidone (NMP).

According to some embodiments of the present application, referring to fig. 1, the powder conveying apparatus 100 provided by the present application includes a premixing unit 110, a first injecting unit 120, a second injecting unit 130, and a conveying unit 140, where the premixing unit 110 includes a premixing container 111 and a mixing mechanism 112, the first injecting unit 120 and the second injecting unit 130 are respectively used for injecting a solvent and powder into the premixing container 111, the mixing mechanism 112 is used for mixing the powder and the solvent in the premixing container 111 to form a mixed solution, and the conveying unit 140 is communicated with the premixing container 111 and used for conveying the mixed solution.

In the premixing unit 110, the premixing vessel 111 is a vessel having a certain accommodating space to accommodate the powder and the solvent, and may be a premixing tank, a premixing barrel, or the like. The mixing mechanism 112 is a mechanism capable of mixing the powder and the solvent in the pre-mixing container 111 so that the powder is dissolved in the solvent and a mixed solution having a uniform texture is obtained. The mixing means 112 may be a stirring means such as a paddle or a stirring rod, which is provided at least partially in the premix vessel 111 and stirs the powder and the solvent in the premix vessel 111 while rotating in the premix vessel 111. The mixing mechanism 112 may also be a rotating mechanism disposed outside the pre-mixing container 111, and the rotating mechanism may drive the pre-mixing container 111 to rotate, so that the powder and the solvent inside the pre-mixing container 111 may be mixed when the pre-mixing container is rotated.

The first injection unit 120 may cut off or conduct the solvent source and the premix container 111 to realize whether to inject the solvent into the premix container 111, and the second injection unit 130 may cut off or conduct the powder source and the premix container 111 to realize whether to inject the powder into the premix container 111. The first and

second injection units

120 and 130 may include, but are not limited to, corresponding injection pipes and valve members provided on the injection pipes and capable of cutting or conducting the injection pipes.

The delivery unit 140 may communicate the premix container 111 and the outside to deliver the mixed solution in the premix container 111 to the outside. The delivery unit 140 may, but is not limited to, include a corresponding delivery pipe, and may, but is not limited to, further include a valve member disposed on the delivery pipe and capable of cutting off or conducting the delivery pipe. The conveying unit 140 may convey the mixed solution to the stirring device 200 in the downstream stirring process, and may be directly used as one of the raw materials in the stirring device 200.

According to the powder conveying device 100, the powder and the solvent are premixed, and then the solvent is used as the carrier to convey the powder, so that the problem that the powder is easy to rub and discharge to cause combustion and explosion in pneumatic transportation can be avoided. Meanwhile, the solvent is used as a carrier to convey the powder, the solvent can enter a downstream process without being separated from the powder, the problem of solvent emission does not exist, the problem of ventilation requirement of an emission environment does not exist, and the method is suitable for the existing factory buildings. In addition, the solvent is used as a carrier to convey the powder, so that the solvent and the powder can be pre-mixed while the powder is conveyed, and the mixing efficiency of a downstream stirring process can be improved.

In some embodiments, referring to fig. 1 and fig. 2, the first injection unit 120 includes a first flow meter 121 and a first switch component 122, which are communicatively connected, and the flow rate of the solvent flowing through the first injection unit, measured by the first flow meter 121, is defined as a first measurement value. The first switch member 122 is used to interrupt communication between the solvent source and the premix vessel 111 when the first measurement value reaches a first preset amount.

The solvent source is a device loaded with a solvent, and may be a solvent tank, or the like, but is not limited thereto. The solvent may be, but is not limited to, N-methyl pyrrolidone (NMP), which should be matched to the type of powder to be mixed with the powder to form a mixed solution.

The first flow meter 121 and the first switching member 122 are provided on a first injection line that communicates the solvent source and the premix vessel 111. The first flow meter 121 may measure the flow rate of the solvent flowing therethrough, through which the solvent finally flows into the pre-mixing vessel 111, by which the total content of the solvent injected into the pre-mixing vessel 111 may be measured. The first flow meter 121 may be a velocity flow meter, a mass flow meter, a positive displacement flow meter, or the like, and is not particularly limited. The first switching member 122 can cut off or conduct communication between the solvent source and the premix container 111, and may be, but not limited to, an electric valve, a pneumatic valve, an electric pump, and the like, and is not limited thereto.

The first flow meter 121 may be located upstream of the first switching element 122, or may be located downstream of the first switching element 122, which is not limited in particular.

The communication connection between the first flow meter 121 and the first switch component 122 includes both electrical connection and wireless communication connection. Specifically, the first flow meter 121 and the first switch member 122 may be communicatively connected via a control device, that is, the first flow meter 121 is communicatively connected to the control device, and the control device is communicatively connected to the first switch member 122. The control device may be integrated with any one of the first flow meter 121 and the first switching member 122, or may be provided independently. The manner of how the first flow meter 121 and the first switching member 122 are communicatively connected is not particularly limited.

When the first measurement value measured by the first flow meter 121 reaches a first preset amount, indicating that the injected solvent has reached the set content, the first switching member 122 cuts off the communication between the solvent source and the premix container 111.

Thus, the quantitative injection of the solvent can be realized, the proportion of the mixed solution obtained by mixing in the premixing container 111 can be kept consistent, the required solvent content can be conveniently and accurately injected into the downstream stirring process, and the stability of the proportion of substances in the mixture obtained in the downstream stirring process can be ensured.

In particular to some embodiments, the first flow meter 121 is a mass flow meter. Specifically, the first flow meter 121 may be a calorimetric mass flow meter, an angular momentum mass flow meter, a gyro mass flow meter, a dual-impeller mass flow meter, or the like, and is not particularly limited.

At this time, the mass flow meter is used to directly measure the mass of the solvent entering the premixing container 111, the metering precision is high, and the requirement of the battery industry on the precision can be met.

Of course, in other embodiments, the dosing of the solvent may be accomplished by way of a solvent source. Such as a flow meter, is provided on the solvent source through which a measured amount of solvent is injected into the premix vessel 111.

In some embodiments, referring to fig. 1 and 2, the second injection unit 130 includes a feeding container 131 and a dosing member 132, and the dosing member 132 is connected between the feeding container 131 and the pre-mixing container 111. The feed container 131 is used to receive powder, and the metering member 132 is used to deliver a set amount of powder to the premix vessel 111.

The charging container 131 is a container for charging the powder in the powder pack into the container by a person, and may be a charging tank, a charging barrel, or the like. The outlet of the feeding container 131 is communicated with the quantitative member 132 through a pipeline, the outlet of the quantitative member 132 is communicated with the premixing container 111 through a pipeline, and after the powder in the powder bag is fed into the feeding container 131, the powder is quantitatively conveyed into the premixing container 111 under the action of the quantitative member 132. The quantitative member 132 may be a powder delivery pump (a pump for delivering powder by vacuum suction to generate a strong negative pressure in the tank, and a level gauge may be provided therein to deliver powder quantitatively).

At this time, the quantitative material 132 is used to deliver a fixed amount of powder material to the pre-mixing container 111, so that the proportion of the mixed solution obtained by mixing in the pre-mixing container 111 can be kept consistent each time, the required content of the powder material can be conveniently and accurately injected into the downstream stirring process, and the stability of the material proportion in the mixture obtained in the downstream stirring process can be ensured.

Specifically, referring to fig. 3, the quantitative member 132 includes a housing 132a and a quantitative disc 132b, the quantitative disc 132b is rotatably disposed in the housing 132a, the housing 132a has an inlet and an outlet communicating with the interior thereof, the inlet is communicated with the feeding container 131, and the outlet is communicated with the premix container 111. The quantitative tray 132b partitions the inside of the housing 132a to form a plurality of quantitative sections v that are axially symmetrical with respect to itself, and each quantitative section v can be switched between a feeding position located toward the inlet and a discharging position located toward the outlet when the quantitative tray 132b rotates.

The quantitative tray 132b partitions the inner space of the housing 132a to form a plurality of quantitative sections v, and switches the quantitative sections v between the feeding position and the discharging position when rotating. The quantitative disc 132b may be specifically configured such that the quantitative disc 132b includes a rotating shaft and a plurality of blades spaced along a circumferential direction of the rotating shaft, and two adjacent blades and an inner wall of the housing 132a together define a quantitative region v. The rotating shaft is used for being connected with a power source (such as a motor) and rotating under the driving of the power source. When the rotating shaft rotates, the blades rotate along with the rotating shaft, so that the quantitative areas v are switched between a feeding position and a discharging position. When the metering disc 132b is rotated to a position in which the metering zone v is in communication with the inlet, the metering zone v is in the feed position and powder can enter the metering zone v via the inlet. During the rotation of the metering disc 132b, the powder in the metering area v is pushed by the vanes to move toward the outlet until the metering area v is opposite to the outlet, through which the powder is discharged toward the premix vessel 111. Of course, the configuration of the quantitative disk 132b is not limited thereto.

Understandably, the capacity of the quantitative section v is fixed, and the number of times the quantitative section v communicates with the premix container 111 can be controlled to realize the metering of the powder discharged into the premix container 111. The control of the number of times of communication can be realized by controlling a quantitative rotation angle. For example, when the number of the metering areas v is 6, the powder in one metering area v can be discharged into the premix vessel 111 by rotating the metering disc 132b by 60 °, and when the metering disc 132b is rotated by 300 °, 5 metering areas v are sequentially connected to the premix vessel 111 and the powder is supplied into the premix vessel 111. When the metering disc 132b is rotated 720 °, there are 12 metering zones v which are in succession with the premix container 111 and which inject the powder into the premix container 111.

Thus, the powder can be metered by controlling the rotation angle of the metering disc 132b, and the metering mode is simple.

Alternatively, the inlet and outlet ports are located on diametrically opposite sides of the quantitative disk 132 b. Typically the inlet is located below the feed container 131 where the powder falls under its own weight. The outlet is positioned above the premixing container 111, and when the outlet is positioned at the discharging position, powder in the quantitative area v can enter the premixing container 111 under the self weight, so that the energy conservation is facilitated.

In some embodiments, referring to fig. 1 and fig. 2, the conveying unit 140 includes a conveying line 141, a second switch member 142 and a second flow meter 143, the conveying line 141 is connected to the outlet of the premix container 111, and the second switch member 142 and the second flow meter 143 are both located on the conveying line 141. The second switch component 142 is in communication connection with the second flow meter 143, and defines the flow rate of the mixed solution flowing through the delivery pipe 141 measured by the second flow meter 143 as a second measurement value, and the second switch component 142 is configured to cut off the delivery pipe 141 when the second measurement value reaches a second preset amount.

The transfer line 141 is used to transfer the mixed solution to the outside (e.g., in the stirring device 200 in the stirring process downstream), the second flow meter 143 and the second switching member 142 are provided on the transfer line 141, and the second flow meter 143 can cumulatively measure the flow rate of the solvent flowing through itself to measure the total amount of the mixed solution flowing through the transfer line 141, by which the content of the mixed solution transferred to the outside can be measured. The second flow meter 143 may be, but is not limited to, a velocity flow meter, a mass flow meter, a positive displacement flow meter, and the like. Optionally, the second flow meter 143 is a mass flow meter. The mass flow meter is used for directly measuring the flow of the mixed solution conveyed by the conveying pipeline 141, the metering precision is high, and the requirement of the battery industry on the precision can be met.

The second switching member 142 can cut off or open the transfer line 141, and may be, but not limited to, an electric valve, a pneumatic valve, an electric pump, a pneumatic pump, and the like, and is not limited thereto. The second flow meter 143 may be located upstream of the second switching member 142, or may be located downstream of the second switching member 142, and is not limited in particular.

The communication connection between the second flow meter 143 and the second switch member 142 includes both electrical connection and wireless communication connection. Specifically, the second flow meter 143 and the second switch member 142 may be communicatively connected via a control device, that is, the second flow meter 143 is communicatively connected to the control device, and the control device is communicatively connected to the second switch member 142. The control device may be integrated with any one of the second flow meter 143 and the second switching member 142, or may be provided independently. The manner how the second flow meter 143 and the second switching member 142 are communicatively connected is not particularly limited.

When a second measured value measured by the second flow meter 143 reaches a second preset amount, which indicates that the mixed solution to be delivered has reached a set content, the second switching member 142 shuts off the delivery line 141.

In this way, the constant-volume delivery of the mixed solution is realized, the constant-volume injection of the mixed solution by the stirring device 200 in the downstream stirring step can be ensured, and the stability of the material ratio in the mixture obtained in the downstream stirring step can be ensured.

In some embodiments, referring to fig. 1 and 2, the second switch component 142 includes a pump body 142a communicatively connected to the second flow meter 143, the pump body 142a is disposed on the delivery pipe 141 and located upstream of the second flow meter 143, the pump body 142a is configured to provide power for the mixed solution to flow through the delivery pipe 141, the pump body 142a conducts the delivery pipe 141 when operating, and the pump body 142a cuts off the delivery pipe 141 when stopping.

The pump body 142a is a machine capable of increasing the energy of the liquid to deliver the liquid, and is a common component in the art, and the detailed structure thereof is not described herein. The pump body 142a may be a positive displacement pump body 142a or a vane pump body 142a, and may specifically be an axial flow pump, a centrifugal pump, a mixed flow pump, and the like, which is not limited herein.

When the second measurement value measured by the second flow meter 143 does not reach the second predetermined amount, the pump body 142a maintains the operation state, and the mixed solution is accelerated to be delivered to the outside through the delivery pipe 141. When the second measurement value measured by the second flow meter 143 reaches a second predetermined value, the pump 142a stops working, the mixed solution cannot flow to the conveying pipeline 141 downstream of the pump 142a through the pump 142a, and the conveying of the mixed solution stops.

At this time, the pump body 142a may provide power to the mixed solution to accelerate the flow of the liquid, so as to ensure that the mixed solution can be smoothly delivered to the outside, without limiting the installation position of the second delivery pipe 141, and the layout is more flexible. Meanwhile, the pump body 142a can also be used as a switch component to turn on or off the conveying pipeline 141, so that the cost can be reduced and the structure can be simplified.

In particular, in some embodiments, the pump body 142a is configured to adjust its pumping speed according to a second preset quantity in relation to a second measurement value measured by the second flow meter 143 in real time.

The faster the pumping speed, the faster the flow speed of the mixed solution in the delivery line 141, and the more the content of the mixed solution delivered to the outside per unit time. The slower the pumping speed, the slower the flow speed of the mixed solution in the transfer line 141, and the less the content of the mixed solution transferred to the outside per unit time.

The process of the pump body 142a adjusting its pumping speed according to the relationship between the preset second preset quantity and the second measured value may be, but is not limited to: and when the difference value between the second preset quantity and the second measured value is smaller than the second difference threshold value, the water pump pumps the mixed solution at a lower pumping speed until the second preset quantity and the second measured value are equal, and the mixed solution is stopped. The second difference threshold is less than the first difference threshold. Specifically, the pump body 142a can adjust its own pumping speed according to the relationship between the second preset amount and the second measured value based on PCL (programmable logic controller) control, with excellent reliability.

Less mixed solution is conveyed in the early stage of pumping, the pumping speed of the pump body 142a can be increased, and the conveying efficiency of the mixed solution is increased. The mixed solution is delivered at the later stage of pumping, only a small amount of mixed solution needs to be delivered, and the pump body 142a can deliver the mixed solution at a lower pumping speed, so that the content accuracy of the delivered mixed solution can be improved.

At this moment, the pump body 142a can adjust the pumping speed of itself in real time according to the flow of the mixed solution of carrying, can enough accelerate the transport of mixed solution in the earlier stage of carrying, improves transport efficiency, can slow down the speed of mixed solution in the later stage of carrying again, improves the accuracy nature that mixed solution carried content.

Specifically, referring to fig. 2, the switch component further includes an outlet valve 142b communicatively connected to the second flow meter 143, the outlet valve 142b is disposed in the delivery pipe 141 and located downstream of the second flow meter 143, and the outlet valve 142b is configured to adjust an opening degree thereof according to a relationship between a second preset quantity and a second measured value measured by the second flow meter 143 in real time.

The outlet valve 142b is used for opening or closing the conveying pipeline 141, and may be a pneumatic valve, an electric valve, or the like, and the opening degree of the outlet valve 142b may be adjustable, and the specific configuration of the outlet valve 142b as a conventional component in the art is not described herein. The larger the opening degree of the outlet valve 142b, the larger the flow rate thereof. The smaller the opening degree of the outlet valve 142b, the smaller the flow rate thereof.

When the second measured value is smaller, the outlet valve 142b may increase its opening degree, thereby increasing the throughput of the mixed solution, which is beneficial to quickening the transportation of the mixed solution. When the second measured value is larger, the outlet valve 142b can reduce the opening degree thereof, reduce the flow rate of the mixed solution, help to slow down the delivery of the mixed solution in the later period of delivery, and ensure the accurate control of the delivered content of the mixed solution. Specifically, the pump body 142a can adjust the opening degree thereof according to the relationship between the second preset amount and the second measured value based on PCL (programmable logic controller), and has excellent reliability.

At this moment, the outlet valve 142b can adjust the pumping speed of the outlet valve in real time according to the output quantity of the mixed solution, so that the outlet valve can be used for conveying the large-flow mixed solution in the early stage of conveying, the conveying efficiency is improved, the conveying of the mixed solution can be slowed down in the later stage of conveying, and the accurate control of the conveying content of the mixed solution is ensured. Further, the outlet valve 142b can prevent leakage and dripping at the outlet of the transfer line 141.

In some embodiments, the pre-mixing unit 110 further comprises a liquid level detecting element (not shown) for detecting the liquid level of the pre-mixing container 111, the liquid level detecting element is in communication with the first injecting unit 120 and the second injecting unit 130, and the first injecting unit 120 and the second injecting unit 130 are used for injecting the solvent and the powder into the pre-mixing container 111 when the liquid level of the pre-mixing container 111 is lower than a preset liquid level.

The liquid level detecting element may be an ultrasonic liquid level meter, a magnetic float liquid level meter, a floating ball liquid level meter, etc., which are conventional components in the art, and the specific configuration thereof is not limited and described herein.

When the liquid level of the mixed solution in the pre-mixing container 111 after being transferred to the outside through the transfer line 141 is lower than the predetermined liquid level, the content requirement for transferring the mixed solution to the outside next time may not be satisfied, and thus it is necessary to refill the solvent and the powder to form more mixed solution.

When the liquid level detecting element detects that the liquid level of the pre-mixing container 111 is lower than the preset liquid level, the liquid level detecting element sends a control instruction to the first injection unit 120 and the second injection unit 130 to control the first injection unit 120 and the second injection unit 130 to respectively inject the solution and the powder into the pre-mixing container 111.

Specifically, the liquid level detecting element is in communication connection with the first switch component 122 in the first injecting unit 120, and sends a control command to the first switch component 122 when the liquid level of the pre-mixing container 111 is lower than a preset liquid level, the first switch component 122 turns on the first injecting pipeline in response to the control command, allows the solvent of the solvent source to be injected into the pre-mixing container 111, and cuts off the solvent source and the pre-mixing container 111 when a first measured value measured by the first flowmeter 121 reaches a first preset amount, thereby completing the quantitative injection of the solvent.

Specifically, the liquid level detecting element is in communication connection with the quantifying element 132 in the second injecting unit 130, and sends a control instruction to the quantifying element 132 when the liquid level of the pre-mixing container 111 is lower than a preset liquid level, and the quantifying element 132 rotates in response to the control instruction and drives at least one quantifying area v to move to the discharging position thereof, so that the powder in the quantifying area v is injected into the pre-mixing container 111, and when the liquid level reaches a rotation angle set by itself, the rotation is stopped to stop outputting the powder to the pre-mixing container 111, thereby completing the quantitative injection of the powder.

At this time, the liquid level of the mixed solution in the premixing container 111 is detected by the liquid level detecting member, and the solvent and the solution can be supplemented in time when the liquid level is insufficient, so that the content requirement of conveying the mixed solution to the outside every time is met, and the proportion accuracy of the mixed substance in the downstream stirring process is ensured.

In some embodiments, referring to fig. 4, the powder conveying device 100 further includes a dust removing unit 150, the dust removing unit 150 includes a negative pressure device 151 and a dust remover 152, the dust remover 152 is connected between the negative pressure device 151 and the second injection unit 130, and the negative pressure device 151 is used for generating a suction force for promoting the dust in the second injection unit 130 to enter the dust remover 152.

The negative pressure device 151 is a device capable of generating negative pressure to make air and/or powder flow, and may be, but not limited to, an exhaust fan. The dust collector 152 is a device capable of filtering and retaining powder in an air flow passing through itself, and may be, but is not limited to, a bag-type dust collector 152, a sedimentation type dust collector 152, a cyclone type dust collector 152, a wet type dust collector 152, and the like, and each type of dust collector 152 may adopt a conventional structure in the art, and is not specifically limited and described herein.

Specifically, the dust collector 152 may be communicated with the feeding container 131 (may be communicated with the upper portion of the feeding container 131, and may not affect the feeding container 131 to inject the powder into the pre-mixing container 111, but may facilitate the dust collector 152 to collect the flying dust). When the powder pack is thrown into the feeding container 131, a part of the powder flies to form flying dust. When the negative pressure device 151 works, the flying dust of the feeding container 131 flows to the dust remover 152 under the suction force of the negative pressure device 151 and is retained in the dust remover 152 under the dust removing effect of the dust remover 152, so that the environment is prevented from being polluted by the flying dust.

At this time, the dust generated in the second injection unit 130 is collected and processed by the dust removing unit 150, so that the dust is prevented from overflowing, which is beneficial to environmental protection.

In some embodiments, referring to fig. 4, the dust collector 152 has a dust collecting cavity 152a and a fire extinguishing valve 152b, the dust collecting cavity 152a communicates the negative pressure device 151 and the second injection unit 130, the fire extinguishing valve 152b turns on or off the communication between the fire extinguishing agent source and the dust collecting cavity 152a, a temperature sensor 153 is disposed in the dust collecting cavity 152a, the temperature sensor 153 is in communication connection with the fire extinguishing valve 152b, and when the temperature measured by the temperature sensor 153 reaches a preset temperature, the fire extinguishing valve 152b turns on the fire extinguishing agent source and the dust collecting cavity 152a.

The communication connection between the temperature sensor 153 and the fire extinguishing valve 152b may be an electrical communication connection or a wireless communication connection, or may be a communication connection via a control device. Specifically, the control device is in communication connection with both the temperature sensor 153 and the fire suppression valve 152b, and controls the state switching of the fire suppression valve 152b according to the temperature measured by the temperature sensor 153, so as to conduct or cut off the communication between the fire suppressant source and the dust removal chamber 152a.

The fire extinguishing agent source is a device loaded with a fire extinguishing agent, and may be a fire extinguishing agent tank, a fire extinguishing agent box, or the like, but is not limited thereto. The fire extinguishing agent may be nitrogen, carbon dioxide, or an inert gas, as long as it is capable of extinguishing a fire. The temperature sensor 153 is a conventional component in the art, and the specific configuration and type are not limited herein. The fire extinguishing valve 152b may be a conventional component in the art, such as an electric valve, a pneumatic valve, etc., without limitation. The dust removing chamber 152a is a dust removing place in the dust remover 152, and a dust removing member is disposed therein, and the dust removing member differs depending on the type of the dust remover 152. For example, when the dust collector 152 is a bag collector 152, the dust collecting member is a dust collecting bag.

The fire extinguishing agent source communicates with the dust removing chamber 152a through the fire extinguishing valve 152b, and the fire extinguishing valve 152b blocks communication between the fire extinguishing agent source and the dust removing chamber 152a in a normal state. When the temperature measured by the temperature sensor 153 reaches a preset temperature (for example, 100 ℃), which indicates that the dust in the dust removal cavity 152a is burned and ignited, the fire extinguishing valve 152b can be controlled to conduct the communication between the fire extinguishing agent source and the dust removal cavity 152a, so that the fire extinguishing agent enters the dust removal cavity 152a to extinguish the fire.

At this time, by providing the fire extinguishing valve 152b and the temperature sensor 153, the fire can be extinguished in time when the dust in the dust removing chamber 152a is on fire, thereby avoiding a greater safety accident.

In a further embodiment, the powder conveying device 100 further comprises an alarm (not shown) which is in communication with the temperature sensor 153 and alarms when the temperature measured by the temperature sensor 153 reaches a preset temperature. The alarm can be an alarm lamp, an alarm sound and the like, and only needs to send alarm information. When the temperature measured by the temperature sensor 153 reaches the preset temperature, it is indicated that the dust in the dust removing cavity 152a needs to be extinguished when a fire is caused, and since the fire extinguishing agent needs to be discharged to the environment after the fire is extinguished, the health of workers can be damaged, meanwhile, the risk of explosion caused by the fire also exists, and at the moment, the workers are informed through the alarm, so that the workers can be evacuated safely.

In some embodiments, referring to fig. 4, the dust removing unit 150 further includes a filter 154, and the filter 154 is connected between the negative pressure device 151 and the dust remover 152. The filter 154 is a device capable of filtering dust in air, and may be a filter plate, a filter screen, etc., which may be of a conventional configuration in the art, and is not limited thereto. The filter 154 is disposed between the negative pressure device 151 and the dust collector 152, and can perform secondary filtration on air, so as to prevent dust from being discharged into the environment, which is beneficial to environmental protection.

Referring to fig. 1 to 4, a powder conveying apparatus 100 provided in some embodiments of the present application includes a premixing unit 110, a first injecting unit 120, a second injecting unit 130, a conveying unit 140, and a dust removing unit 150, where the premixing unit 110 includes the premixing container 111 and the mixing mechanism 112, the first injecting unit 120 includes the first flow meter 121 and the first switch member 122, the second injecting unit 130 includes the material charging container 131 and the dosing member 132, the conveying unit 140 includes the second flow meter 143, the pump body 142a, and the outlet valve 142b, and the dust removing unit 150 includes the vacuum cleaner 151, the dust remover 152, and the functions and the connection relationship of the various components may refer to the general description of the above embodiments, which is not limited herein. In this embodiment, the operation of the powder conveying device 100 is as follows: the worker turns on the negative pressure device 151 to throw the powder package into the feed container 131, the first switch member 122 is turned on, the solvent source injects a predetermined amount of solvent into the premix container 111 through the first switch member 122 and the first flow member, and the quantitative member 132 rotates to inject a predetermined amount of powder into the premix container 111. The mixing mechanism 112 is activated to mix the powder and the solvent in the premix container 111 to form a mixed solution. The pump body 142a and the outlet valve 142b on the delivery line 141 are opened, the second flow meter 143 measures the delivered mixed solution until the set delivery level is reached, and the body and the outlet valve 142b are closed.

In another aspect, referring to fig. 5, according to some embodiments of the present application, a method for controlling a powder conveying apparatus 100 is further provided, including:

s10, controlling the first injection unit 120 to inject the solvent into the premixing container 111;

s20, controlling a second injection unit 130 to inject powder into the premixing container 111;

s30, starting a mixing mechanism 112 to mix the solvent and the powder in the premixing container 111 to obtain a mixed solution;

and S40, controlling the conveying unit 140 to convey the mixed solution.

The powder conveying device 100 may be the powder conveying device 100 according to any of the above embodiments, and includes a premixing unit 110, a first injecting unit 120, a second injecting unit 130, and a conveying unit 140, where the premixing unit 110 includes a premixing container 111 and a mixing mechanism 112, the first injecting unit 120 and the second injecting unit 130 are respectively used for injecting a solvent and a powder into the premixing container 111, the mixing mechanism 112 is used for mixing the powder and the solvent in the premixing container 111 to form a mixed solution, and the conveying unit 140 is communicated with the premixing container 111 and used for conveying the mixed solution. The structures and descriptions of the premix vessel 111, the mixing mechanism 112, the first injection unit 120, the second injection unit 130, and the delivery unit 140 refer to the descriptions of the above embodiments, and are not repeated herein.

In addition, the powder conveying apparatus 100 may further include a control unit (not shown) which is in control connection with the first injecting unit 120, the second injecting unit 130, the mixing mechanism 112 and the conveying unit 140, and the control unit implements the automatic powder conveying of the powder conveying apparatus 100 when the steps S10 to S40 are executed. The control unit may include a memory device loaded with a processing device such as a microprocessor, a central processing unit, and a single chip microcomputer, and a computer program, and the processing device executes the steps S10 to S40 when running the computer program stored in the memory device. Of course, the powder conveying apparatus 100 may not include the control unit, and the steps from step S10 to step S40 may be implemented by manual operation. The following description will be made by taking a control unit as an execution subject of the control method of the powder conveying apparatus 100.

It should be noted that, step S10 and step S20 may be performed simultaneously, may be performed sequentially, and both are not in sequence. After step S10 and step S20 are executed, step S30 and step S40 are executed in order.

In steps S10 and S20, the control unit may issue control commands to the first injection unit 120 and the second injection unit 130, respectively, and the first injection unit 120 and the second injection unit 130 inject the solvent and the powder into the premix vessel 111 in response to the control commands, respectively.

In step S30, after the control unit controls the mixing mechanism 112 to be activated, the control unit may control the mixing mechanism 112 to be turned off after the mixing mechanism 112 is operated for a set time. The mixing mechanism 112 can sufficiently mix the powder and the solvent in the premix container 111 by operating for a predetermined time to obtain a uniformly mixed solution.

In step S40, after the mixing mechanism 112 is turned off, and when a feeding command requiring to feed the mixed solution to the outside is received, the control unit controls the feeding unit 140 to feed the mixed solution, where the feeding command may be triggered by a user, or may be triggered by the stirring device 200 in the downstream stirring process, which is not limited specifically. The controller may control the delivery unit 140 to deliver the mixed solution by controlling the opening of the outlet of the premix container 111, or may further control the delivery unit 140 to deliver the mixed solution by opening a valve of the delivery unit 140 that cuts off or connects the outside of the premix container 111.

According to the control method of the powder conveying device 100, the powder and the solvent are premixed, and then the solvent is used as the carrier to convey the powder, so that the problem that the powder is easy to rub and discharge in pneumatic transportation to cause combustion and explosion can be avoided. Meanwhile, the solvent is used as a carrier for conveying the powder, the solvent can enter a downstream process without being separated from the powder, the problem of solvent discharge does not exist, and further the problem of ventilation requirement of a discharge environment does not exist, so that the method is suitable for the existing workshop. In addition, the solvent is used as a carrier to convey the powder, so that the solvent and the powder can be pre-mixed while the powder is conveyed, and the mixing efficiency of a downstream stirring process can be improved.

In some embodiments, referring to fig. 6, the step S10 of controlling the first injection unit 120 to inject the solvent into the pre-mixing container 111 specifically includes:

s11, controlling the first switch component 122 to connect the communication between the solvent source and the pre-mixing container 111, and obtaining a first measurement value, where the first measurement value is the flow rate of the solvent flowing through the first flow meter 121;

s12, when the first measured value reaches the first preset amount, controlling the first switching member 122 to cut off the communication between the solvent source and the premix container 111.

At this time, the first injection unit 120 includes a first flow meter 121 and a first switch member 122 which are communicatively connected, and defines the flow rate of the solvent flowing through itself measured by the first flow meter 121 as a first measurement value. The first switch member 122 is used to interrupt communication between the solvent source and the premix container 111 when the first measurement reaches a first preset amount. The first flow meter 121 and the first switching member 122 are introduced as described in the above embodiments.

The controller is communicatively connected to both the first flow meter 121 and the first switch member 122. In step S11, the controller controls the first switch member 122 to connect the communication between the solvent source and the pre-mixing container 111, so that the solvent can enter the pre-mixing container 111, and obtains the first measurement value from the first flow meter 121 in real time, in step S12, the controller compares the obtained first measurement value with the first preset value stored in the memory thereof, and when the first measurement value reaches the first preset value, which indicates that the content of the injected solvent is up to the standard, a switching command is issued to the first switch member 122, and the first switch member 122 responds to the switching command to cut off the communication between the solvent source and the pre-mixing container 111.

In some embodiments, referring to fig. 7, the step S20 of controlling the second injecting unit 130 to inject the powder into the pre-mixing container 111 specifically includes: s21, controlling the quantitative member 132 to convey powder with set content to the premixing container 111.

At this time, the second injection unit 130 includes a feeding container 131 and a metering member 132, and the metering member 132 is communicated between the feeding container 131 and the premix container 111. The feed container 131 is used to receive powder, and the metering member 132 is used to deliver a set amount of powder to the premix vessel 111. The introduction of the dosage vessel 131 and the dosing member 132 is described with reference to the above embodiments and will not be described in further detail here. At this time, the controller may send a control command to the quantitative member 132 when executing step S21, and the quantitative member 132 may receive the control command and then deliver the powder with the set content to the pre-mixing container 111.

When the quantitative member 132 is a powder delivery pump, it starts its own motor after receiving a control command sent by the controller, and turns off the motor and opens the output port when the preset material level is reached in its own tank (measured by the level gauge), and the powder in its tank is injected into the pre-mixing container 111 through the output port.

When the quantitative member 132 includes the housing 132a and the quantitative disc 132b in the above embodiments, it starts its own motor after receiving a control command from the controller, and the motor drives the quantitative disc 132b to rotate by a preset angle and then stops. During the rotation of the metering disc 132b, the metering zone v passes the discharge position continuously, and the injection of the metered powder into the premix container 111 is completed.

In some embodiments, referring to fig. 8, the step S40 of controlling the conveying unit 140 to convey the mixed solution specifically includes:

s41, controlling the second switch component 142 to conduct the conveying pipeline 141, and obtaining a second measurement value, where the second measurement value is the flow rate of the mixed solution flowing through the conveying pipeline 141 measured by the second flow meter 143;

and S42, when the second measured value reaches a second preset value, controlling the second switching component 142 to cut off the conveying pipeline 141.

At this time, the delivery unit 140 includes a delivery line 141, a second switching member 142, and a second flow meter 143, the delivery line 141 communicates with the outlet of the premix vessel 111, and both the second switching member 142 and the second flow meter 143 are located in the delivery line 141. The second switch component 142 is in communication connection with the second flow meter 143, and defines the flow rate of the mixed solution flowing through the delivery pipe 141 measured by the second flow meter 143 as a second measurement value, and the second switch component 142 is configured to cut off the delivery pipe 141 when the second measurement value reaches a second preset amount. For the introduction of the delivery pipe 141, the second switch member 142 and the second flow meter 143, reference may be made to the description of the above embodiments, which are not repeated herein.

The controller is in communication connection with both the second flow meter 143 and the second switch member 142, and in step S41, the controller controls the second switch member 142 to conduct the delivery pipe 141, so that the mixed solution can flow to the outside through the delivery pipe 141, and meanwhile, the controller obtains a second measurement value from the second flow meter 143 in real time to detect the output amount of the mixed solution. In step S42, the controller compares the second measured value with a second preset amount stored in its memory, and when the second measured value reaches the second preset amount, which indicates that the output amount of the mixed solution is up to the standard, the controller sends a switching instruction to the second switching member 142, and the second switching member 142 responds to the switching instruction and cuts off the communication between the outside and the premix container 111.

Specifically, in the example, the second switch member 142 includes the pump body 142a and/or the outlet valve 142b, and the controller controls the pump body 142a and the outlet valve 142b to be opened in step S41, and controls the pump body 142a to be stopped and the outlet valve 142b to be closed when the second measured value reaches the second preset amount in step S40.

In some embodiments, referring to fig. 9, before the step S10 of controlling the first injection unit 120 to inject the solvent into the premix container 111 and the step S20 of controlling the second injection unit 130 to inject the powder into the premix container 111, the method further includes:

s50, acquiring the liquid level of the premixing container 111 from the liquid level detection part, judging whether the liquid level of the premixing container 111 is lower than a preset liquid level, and if so, executing steps S10 and S20.

At this time, the pre-mixing unit 110 further includes a liquid level detecting member, the liquid level detecting member is used for detecting the liquid level of the pre-mixing container 111, the liquid level detecting member is in communication connection with the first injecting unit 120 and the second injecting unit 130, and the first injecting unit 120 and the second injecting unit 130 are used for injecting the solvent and the powder into the pre-mixing container 111 when the liquid level of the pre-mixing container 111 is lower than a preset liquid level. The liquid level detection member is described with reference to the above embodiments, and is not described in detail herein.

The controller is communicatively connected to the liquid level detector and acquires the liquid level of the premix vessel 111 from the liquid level detector. When the liquid level of the pre-mixing container 111 is higher than the preset liquid level, it means that the content of the mixed solution in the pre-mixing container 111 can satisfy the requirement of the next delivery amount, and the mixed solution does not need to be prepared again. When the liquid level of the pre-mixing container 111 is lower than the preset liquid level, it indicates that the content of the mixed solution in the pre-mixing container 111 does not meet the requirement of the next delivery amount, and more mixed solution needs to be prepared. Thus, steps S10 and S20 are performed.

So, detect the liquid level of mixed solution in the premix container 111 through the liquid level detection spare, can in time supply solvent and solution when the liquid level is not enough to satisfy the content requirement of carrying mixed solution to the outside at every turn, guarantee the proportion accuracy nature of misce bene in the low reaches stirring process, also can realize the automation of mixed solution and prepare material, degree of automation is high.

In some embodiments, referring to fig. 10, before the step S20 of controlling the second injecting unit 130 to inject the powder into the premix container 111, the method further includes:

s60, the negative pressure device 151 is turned on to suck the dust in the second injection unit 130 into the dust collector 152.

At this time, the powder conveying device 100 further includes a dust removing unit 150, the dust removing unit 150 includes a negative pressure device 151 and a dust remover 152, the dust remover 152 is communicated between the negative pressure device 151 and the second injection unit 130, and the negative pressure device 151 is used for generating a suction force for promoting the dust in the second injection unit 130 to enter the dust remover 152. The introduction of the negative pressure device 151 and the dust remover 152 is referred to the description of the above embodiments, and the description thereof is omitted.

When the powder is continuously injected into the pre-mixing container 111 in the step S20, the powder in the feeding container 131 is easily raised during the movement or the powder is easily raised when the powder pack is fed into the feeding container 131, and the powder is raised to form a raised dust. Step S60 is executed before step S20, the negative pressure device 151 is controlled to be started, and the dust in the feeding container 131 flows to the dust remover 152 under the suction force of the negative pressure device 151 and is retained in the dust remover 152 under the dust removing effect of the dust remover 152, so as to avoid the dust from overflowing to pollute the environment.

In some embodiments, referring to fig. 11, after the step S60 of turning on the negative pressure device 151 to suck the fugitive dust in the second injection unit 130 into the dust remover 152, the method further includes:

s70, when the temperature in the dust removing cavity 152a of the dust remover 152 measured by the temperature sensor 153 reaches the preset temperature, controlling the state that the fire extinguishing valve 152b conducts the fire extinguishing agent source and the dust removing cavity 152a.

At this time, the dust collector 152 has a dust collecting chamber 152a and a fire valve 152b, the dust collecting chamber 152a communicates the negative pressure device 151 and the second injection unit 130, the fire valve 152b switches on or off the communication between the fire extinguishing agent source and the dust collecting chamber 152a, a temperature sensor 153 is disposed in the dust collecting chamber 152a, the temperature sensor 153 is in communication connection with the fire valve 152b, and when the temperature measured by the temperature sensor 153 reaches a preset temperature, the fire valve 152b switches on the fire extinguishing agent source and the dust collecting chamber 152a. For the description of the temperature sensor 153, the fire extinguishing valve 152b and the fire extinguishing agent source, reference is made to the description of the above embodiments, which are not repeated herein.

The controller is in communication connection with both the temperature sensor 153 and the fire valve 152b, and when the controller is in a normal state, the fire valve 152b cuts off the communication between the fire extinguishing agent source and the dust removing cavity 152a, so that dust is prevented from entering the fire extinguishing agent source. In step S70, when the temperature in the dust-removing chamber 152a of the dust remover 152 measured by the temperature sensor 153 reaches a preset temperature, which indicates that the dust in the dust-removing chamber 152a is on fire, the controller controls the fire extinguishing valve 152b to switch states and conduct the fire extinguishing agent source and the dust-removing chamber 152a, so that the fire extinguishing agent enters the dust-removing chamber 152a to extinguish the fire. When the temperature in the dust removing chamber 152a of the dust remover 152 measured by the temperature sensor 153 does not reach the preset temperature, which indicates that the dust in the dust removing chamber 152a is not on fire, the fire extinguishing valve 152b is controlled to cut off the fire extinguishing agent source and the dust removing chamber 152a, so as to remove dust normally.

In a third aspect, an embodiment of the present application provides a battery slurry production apparatus 1000, please refer to fig. 12, which includes an agitation device 200 and the powder conveying device 100 in the foregoing embodiment, and the conveying unit 140 is used for conveying the mixed solution to the agitation device 200.

The stirring device 200 is a device capable of stirring the solution inside itself, and stirring members such as a stirring rod and a stirring paddle may be disposed therein, and may have a conventional structure in the art, and will not be described herein. When the raw material of the battery paste contains a plurality of powders, the respective powders of the raw material may be respectively transferred into the stirring device 200 by a set of powder transfer device 100. Particularly, when combustible powder is conveyed, the powder conveying device 100 provided by the application is adopted to convey and feed. In one practical example, the powder may be CMC powder and the solvent may be NMP solvent.

In the battery slurry production equipment 1000, the raw material powder can be conveyed to the stirring device 200 by the powder conveying device 100, and the solvent is used as a carrier to convey the powder, so that the problem that the powder is easy to rub and discharge in pneumatic transportation to cause combustion and explosion can be avoided. Meanwhile, the solvent is used as a carrier to convey the powder, the solvent can enter a downstream process without being separated from the powder, the problem of solvent emission does not exist, the problem of ventilation requirement of an emission environment does not exist, and the method is suitable for the existing factory buildings. In addition, the solvent is used as a carrier to convey the powder, so that the solvent and the powder can be mixed in advance while the powder is conveyed, and the mixing efficiency of a downstream stirring process can be improved.

All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, and these are all within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A powder conveying device is characterized by comprising:

a premix unit (110) comprising a premix vessel (111) and a mixing mechanism (112);

a first injection unit (120) and a second injection unit (130) for injecting a solvent and a powder, respectively, into the premix container (111), and the mixing mechanism (112) for mixing the powder and the solvent in the premix container (111) to form a mixed solution;

a delivery unit (140) in communication with the premix vessel (111) for delivering the mixed solution.

2. The powder conveying apparatus according to claim 1, wherein said first injecting unit (120) comprises a first flow meter (121) and a first switch member (122) which are connected in communication, and the flow rate of said solvent flowing through itself measured by said first flow meter (121) is defined as a first measured value;

the first switch member (122) is configured to interrupt communication between a source of solvent and the premix container (111) when the first measurement reaches a first preset amount.

3. The powder conveying apparatus according to claim 1, wherein said second injection unit (130) comprises a dosing container (131) and a dosing member (132), said dosing member (132) communicating between said dosing container (131) and said pre-mixing container (111);

the feeding container (131) is used for receiving the powder, and the dosing part (132) is used for conveying the powder with set content to the premixing container (111).

4. The powder conveying device according to claim 3, wherein the quantitative member (132) comprises a housing (132 a) and a quantitative disc (132 b), the quantitative disc (132 b) is rotatably arranged in the housing (132 a), the housing (132 a) is provided with an inlet and an outlet which are communicated with the interior of the housing, the inlet is communicated with the feeding container (131), and the outlet is communicated with the premixing container (111);

the quantitative disc (132 b) divides the inside of the shell (132 a) into a plurality of quantitative areas (v) which are axially symmetrical relative to the shell, and when the quantitative disc (132 b) rotates, each quantitative area (v) can be switched between a feeding position arranged towards the inlet and a discharging position arranged towards the outlet.

5. The powder conveying device according to claim 1, wherein the conveying unit (140) comprises a conveying pipeline (141), a second switch member (142) and a second flow meter (143), the conveying pipeline (141) is communicated with the outlet of the pre-mixing container (111), and the second switch member (142) and the second flow meter (143) are both positioned on the conveying pipeline (141);

wherein the second switch member (142) is in communication with the second flow meter (143) and defines a flow rate of the mixed solution flowing through the delivery line (141) measured by the second flow meter (143) as a second measurement value;

the second switch member (142) is configured to intercept the delivery duct (141) when the second measured value reaches a second preset quantity.

6. The powder conveying device according to claim 5, wherein the second switch member comprises a pump body (142 a) connected in communication with the second flow meter (143), the pump body (142 a) is arranged on the conveying pipeline (141) and located upstream of the second flow meter (143), and the pump body (142 a) is used for providing power for the mixed solution to flow in the conveying pipeline (141);

the pump body (142 a) conducts the conveying pipeline (141) when working, and the pump body (142 a) cuts off the conveying pipeline (141) when stopping.

7. The powder delivery device according to claim 6, wherein the pump body (142 a) is configured to adjust its pumping speed according to the second predetermined amount in relation to the second measured value measured by the second flow meter (143) in real time.

8. The powder delivery device according to claim 5, wherein said switch means further comprises an outlet valve (142 b) in communication with said second flow meter (143), said outlet valve (142 b) being disposed in said delivery conduit (141) downstream of said second flow meter (143);

the outlet valve (142 b) is configured to adjust its opening degree according to the second preset quantity in relation to the second measured value measured by the second flow meter (143) in real time.

9. The powder delivery device according to claim 1, wherein the premixing unit (110) further comprises a liquid level detecting member for detecting a liquid level of the premixing vessel (111);

the liquid level detection piece is in communication connection with the first injection unit (120) and the second injection unit (130), and the first injection unit (120) and the second injection unit (130) are used for respectively injecting the solvent and the powder into the premixing container (111) when the liquid level of the premixing container (111) is lower than a preset liquid level.

10. The powder conveying device according to claim 1, wherein the powder conveying device (100) further comprises a dust removing unit (150), the dust removing unit (150) comprises a negative pressure device (151) and a dust remover (152), the dust remover (152) is communicated between the negative pressure device (151) and the second injection unit (130), and the negative pressure device (151) is used for generating suction force for promoting the dust in the second injection unit (130) to enter the dust remover (152).

11. The powder conveying apparatus according to claim 10, wherein said dust collector (152) has a dust collection chamber (152 a) and a fire extinguishing valve (152 b), said dust collection chamber (152 a) communicating said negative pressure device (151) and said second injection unit (130), said fire extinguishing valve (152 b) turning on or off communication between a fire extinguishing agent source and said dust collection chamber (152 a);

be equipped with temperature sensor (153) in dust removal chamber (152 a), temperature sensor (153) with fire extinguishing valve (152 b) communication is connected, works as the temperature that temperature sensor (153) surveyed reaches preset temperature, fire extinguishing valve (152 b) switch on the fire extinguishing agent source with dust removal chamber (152 a).

12. The powder conveying device according to claim 10, wherein the dust removing unit (150) further comprises a filter (154), and the filter (154) is communicated between the negative pressure device (151) and the dust remover (152).

13. The control method of the powder conveying device is characterized by comprising the following steps:

controlling a first injection unit (120) to inject a solvent into the premix vessel (111);

controlling a second injection unit (130) to inject the powder into the premixing container (111);

activating a mixing mechanism (112) to mix the solvent and the powder in the pre-mixing container (111) and obtain a mixed solution;

controlling a delivery unit (140) to deliver the mixed solution.

14. The method for controlling a powder conveying apparatus according to claim 13, wherein the step of controlling the first injecting unit (120) to inject the solvent into the pre-mixing container (111) comprises:

controlling a first switching means (122) to conduct communication between a solvent source and the premix container (111), and obtaining a first measurement value, which is a flow rate of the solvent flowing through itself measured by a first flow meter (121);

-controlling a first switch member (122) to interrupt the communication between the solvent source and the premix container (111) when the first measurement value reaches a first preset amount.

15. The method for controlling a powder feeder according to claim 13, wherein the step of controlling the second injecting unit (130) to inject powder into the premix container (111) comprises:

controlling a dosing member (132) to deliver a set amount of said powder to said premix container (111).

16. The method for controlling a powder conveying device according to claim 13, wherein the step of controlling the conveying unit (140) to convey the mixed solution comprises:

controlling a second switch component (142) to conduct the conveying pipeline (141) and acquiring a second measurement value, wherein the second measurement value is the flow rate of the mixed solution flowing through the conveying pipeline (141) and is measured by a second flow meter (143);

and when the second measured value reaches a second preset value, controlling a second switch component (142) to cut off the conveying pipeline (141).

17. The method for controlling a powder feeder according to claim 13, further comprising, before the step of controlling the first injecting unit (120) to inject the solvent into the pre-mixing container (111) and the step of controlling the second injecting unit (130) to inject the powder into the pre-mixing container (111):

acquiring the liquid level of the premixing container from the liquid level detection piece, and judging whether the liquid level of the premixing container is lower than a preset liquid level or not;

if yes, the step of controlling the first injection unit (120) to inject the solvent into the premixing container (111) and the step of controlling the second injection unit (130) to inject the powder material temperature into the premixing container (111) are executed.

18. The method for controlling a powder feeder according to claim 13, further comprising, before the step of controlling the second injecting unit (130) to inject powder into the premix container (111):

and opening a negative pressure device (151) to suck the dust in the second injection unit (130) into a dust remover (152).

19. The method for controlling a powder conveying apparatus according to claim 18, further comprising, after said step of turning on the negative pressure device (151):

when the temperature in the dust removing cavity (152 a) of the dust remover (152) measured by the temperature sensor (153) reaches a preset temperature, the state that the fire extinguishing valve (152 b) conducts the fire extinguishing agent source and the dust removing cavity (152 a) is controlled.

20. A battery paste production apparatus, characterized by comprising a stirring device (200) and the powder transporting device (100) according to any one of claims 1 to 12, the transporting unit (140) being configured to transport the mixed solution to the stirring device (200).