Aggregate classifying device and classifying method for building dry-mixed mortar

Abstract

The present application relates to the technical field of aggregate grading for dry-mixed mortar, and provides an aggregate grading device and a grading method for dry-mixed mortar in construction. The grading device comprises a mechanical screening component and an airflow grading component. The mechanical screening component is configured with a screening chamber, and a screening mesh is arranged in the screening chamber. The mechanical screening component is used for mechanically screening aggregate on the screening mesh. The airflow grading component is connected with the screening chamber, and is used for discharging powder in the screening chamber from the screening chamber. Aggregate is placed on the screening mesh of the screening chamber. Particles smaller than the mesh holes of the screening mesh can pass through the mesh holes, and particles larger than the mesh holes are intercepted on the screening mesh to achieve mechanical screening of the aggregate. Powder is discharged from the screening chamber by the airflow grading component. Thus, the defect that the screening mesh of a conventional mechanical screening machine is easily blocked by wet powder when grading aggregate with a high water content and a high powder content, greatly reducing the yield and quality of the screening operation, is overcome.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aggregate grading for dry-mixed mortar, and particularly relates to an aggregate grading device and method for dry-mixed mortar. BACKGROUND

[0002] Dry-mixed mortar refers to a granular or powdery dry mixture in the form of bagged or bulk, which is physically mixed according to a certain proportion by dry screening treatment of aggregates (such as dry sand), inorganic cementitious materials (such as cement) and additives (such as polymers), and can be directly used after being mixed with water. Dry-mixed mortar is a new type of building material encouraged by the state. Dry-mixed mortar is also called dry mortar, dry powder mortar or dry-mixed mortar. Dry-mixed mortar plays a role of bonding, backing, protection and decoration in a thin layer in the construction industry, and is widely used in building and decoration engineering. Among them, dry sand plays a significant role in dry-mixed mortar, and usually accounts for about 70-90% of the weight proportion of dry-mixed mortar. There are many types of dry-mixed mortar, and the particle size of sand required by different types of dry-mixed mortar is different. In order to meet the changing particle size and grading requirements of sand during dry-mixed mortar production, sand is generally graded and then used in a specified proportion.

[0003] The commonly used sand grading equipment is a mechanical screening machine. There are many types of mechanical screening machines, such as drum screens and vibrating screens. The working principle is to use a porous working surface to classify mixed materials of different particle sizes according to particle size. This classification operation is called screening, and the machine used is called a screening machine.

[0004] The main items for evaluating the effect of screening operation are yield and quality. Generally, the finer the screened material and the higher the moisture content, the worse the screening effect. For aggregate with high moisture content and high powder content, the screen of the conventional mechanical screening machine is easily blocked by the wet powder, greatly reducing the yield and quality of the grading operation. SUMMARY

[0005] The present application provides an aggregate grading device and method for dry-mixed mortar, which solves the defect that the screen of the conventional mechanical screening machine is easily blocked by the wet powder when dealing with aggregate with high moisture content and high powder content, greatly reducing the yield and quality of the grading operation.

[0006] The present application provides an aggregate grading device for dry-mixed mortar, comprising:

[0007] A mechanical screening component is configured with a screening chamber, and a screening screen is arranged in the screening chamber; the mechanical screening component is used for mechanically screening granular aggregate on the screening screen;

[0008] An air flow grading component for forced ventilation of the screening chamber to discharge the powdery aggregate in the screening chamber to achieve air flow grading of the aggregate.

[0009] The application provides a kind of aggregate grading device for building dry-mixed mortar, and the mechanical screening component comprises:

[0010] A housing is internally configured with a screening chamber; the housing is configured with a feeding port and a discharging port;

[0011] A support assembly comprises a support leg and an elastic member connected between the housing and the support leg;

[0012] A vibration motor is used to drive the screening mesh to vibrate, achieving mechanical screening of the granular aggregate.

[0013] The application provides a kind of aggregate grading device for building dry-mixed mortar, and the screening mesh is arranged at a certain angle and is provided with more than two layers, and the mesh diameter of the screening mesh in the upper layer is greater than that of the screening mesh in the lower layer.

[0014] The feeding port is arranged above the high end of the uppermost screening mesh;

[0015] The low end of each screening mesh corresponds to a discharging port.

[0016] The application provides a kind of aggregate grading device for building dry-mixed mortar, and the air flow grading component comprises:

[0017] An air inlet is configured at the discharging end of the housing;

[0018] An air outlet is configured at the feeding end of the housing;

[0019] An air inlet adjusting valve is arranged in the air inlet to adjust the opening degree of the air inlet;

[0020] An air outlet adjusting valve is arranged in the air outlet to adjust the opening degree of the air outlet.

[0021] The application provides a kind of aggregate grading device for building dry-mixed mortar, and the air inlet is provided with at least two layers; the number of air inlets in each layer is at least one; one layer of air inlets corresponds to one layer of screening meshes.

[0022] The application provides a kind of aggregate grading device for building dry-mixed mortar, and the air outlet is provided with at least two layers; the number of air outlets in each layer is at least one; one layer of air outlets corresponds to one layer of screening meshes.

[0023] According to the building dry-mixed mortar aggregate grading device provided by the application, the sum of the cross-sectional areas of the air inlets is not less than the sum of the cross-sectional areas of the air outlets.

[0024] The application further provides a building dry-mixed mortar aggregate grading method, which adopts the building dry-mixed mortar aggregate grading device.

[0025] The application provides a building dry-mixed mortar aggregate grading method, which comprises the following steps.

[0026] The aggregate is loaded into the screening chamber from the feeding port and placed on the uppermost screening net, and when mechanical screening is performed, the large-diameter granular aggregate is intercepted by the screening net and discharged from the corresponding discharge port; the small-diameter granular aggregate falls into the lower screening net and is mechanically screened again.

[0027] The application provides a building dry-mixed mortar aggregate grading method, which comprises the following steps.

[0028] According to the powder content and water content of the feeding and the powder content requirement of the discharge, the opening degree of the air outlet adjusting valve on the air outlet is adjusted; according to the distribution of the airflow field in the screening chamber, the opening degree of the air inlet adjusting valve of the air inlet is adjusted, so as to realize airflow classification of the aggregate.

[0029] The application provides a building dry-mixed mortar aggregate grading device and method. By setting the airflow classification component, the mechanical screening component is cooperated to realize the grading strategy of mechanical screening as the main and airflow classification as the auxiliary, and then the problem that the screen of the conventional mechanical screening machine is easily blocked by the wet powder when the aggregate with high water content and high powder content is graded is solved, so that the yield and quality of the screening operation are greatly reduced. The application can effectively reduce the probability of the wet powder adhering to the screen holes of the screening net and blocking the screening net, improve the yield and quality of the mechanical screening, and improve the total yield and quality of the grading operation. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort based on these drawings.

[0031] Figure 1 Figure 1 is a structural schematic diagram of the aggregate grading device for building dry-mixed mortar under front view;

[0032] Figure 2 Figure 2 is a structural schematic diagram of the aggregate grading device for building dry-mixed mortar under left view; Figure 1 Figure 3 is a structural schematic diagram of the aggregate grading device for building dry-mixed mortar under right view.

[0033] Figure 3 Figure 4 is a structural schematic diagram of the aggregate grading device for building dry-mixed mortar under back view. Figure 1

[0034] Reference signs:

[0035] 11, shell; 112, feeding port; 113, discharging port; 12, screening net; 13, vibration motor; 14, support assembly; 141, support leg; 142, elastic member;

[0036] 21, air inlet; 22, air outlet; 23, air inlet adjusting valve; 24, air outlet adjusting valve. DETAILED DESCRIPTION

[0037] In order to make the objects, technical solutions and advantages of the present application clearer, the following will combine the drawings in the present application to clearly and completely describe the technical solutions in the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort belong to the protection scope of the present application.

[0038] In the description of the embodiments of the present application, it should be noted that the orientations or positional relationships indicated by the terms “center”, “longitudinal”, “transverse”, “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer” and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and thus cannot be understood as indicating or implying that the devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application. In addition, the terms “first”, “second”, “third” are only for the purpose of description, and cannot be understood as indicating or implying relative importance. ​

[0039] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0040] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0041] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0042] Figure 1 This is a schematic diagram of the structure of an aggregate grading device for dry-mixed mortar provided by the present invention from the perspective of the main view. Figure 2 yes Figure 1 The diagram shows the structure of the aggregate grading device for dry-mixed mortar in left-hand view. Figure 3 yes Figure 1 The diagram shows a structural schematic of an aggregate grading device for dry-mixed mortar in a right-view perspective. The following is a combination of... Figures 1-3The application provides a building dry-mixed mortar aggregate grading device. The building dry-mixed mortar aggregate grading device comprises a mechanical screening component and an airflow grading component. The mechanical screening component is configured with a screening chamber, and a screening net 12 is arranged in the screening chamber. The mechanical screening component is used for mechanically screening the granular aggregate on the screening net 12. The airflow grading component is used for forcibly ventilating the screening chamber to discharge the powdery aggregate in the screening chamber from the screening chamber, so as to realize airflow grading of the aggregate.

[0043] It should be noted that the granular aggregate with a particle size less than 75 μm is regarded as powdery aggregate in the industry, which is referred to as powder.

[0044] When the building dry-mixed mortar aggregate grading device provided in the application is used to grade the aggregate with a high water content and a high powder content, the aggregate is graded in a mode that mechanical screening is mainly used and airflow grading is secondarily used. Specifically, the mechanical screening component and the airflow grading component are started, the aggregate is placed on the screening net 12 in the screening chamber, the granular aggregate with a mesh smaller than that of the screening net 12 penetrates through the mesh, the granular aggregate with a mesh larger than that of the screening net 12 is intercepted on the screening net 12, and part of the powder is forcibly discharged from the screening chamber by the airflow grading component. Thus, the problem that the screening net of the conventional mechanical screening machine is easily blocked by the damp powder when the aggregate with a high water content and a high powder content is graded, and the yield and quality of the grading operation are greatly reduced is overcome. The embodiment effectively reduces the probability that the damp powder adheres to the mesh of the screening net 12 and blocks the screening net, improves the yield and quality of the mechanical screening, and improves the total yield and quality of the grading operation.

[0045] In addition, the mechanical screening and the airflow grading are combined to screen the aggregate, so that the disadvantages of low efficiency of pure mechanical screening and high energy consumption of pure airflow grading are overcome, a large amount of power consumption is saved, and the equipment space and cost are saved.

[0046] It can be understood that the fine aggregate with a high water content and a high powder content generally refers to the fine aggregate with a water content of 0.5% to 2% and a powder content of more than 15%. The fine aggregate with a water content of more than 2% is difficult to be graded by the dry method. The fine aggregate with a water content of less than 0.5% and a powder content of less than 5% can be generally screened by the conventional mechanical screening. In order to meet the environmental protection requirements, the screening machine is usually fully closed without an air inlet and is provided with an air outlet at the upper portion to prevent dust overflow by the fan. In the embodiment of the application, the air inlet and the air outlet are specially arranged to forcibly ventilate the screening chamber, so that the grading efficiency is effectively improved. The basic principle of the forced ventilation is that the higher the water content and the powder content, the higher the ventilation volume.

[0047] In the specific embodiments of the present application, the mechanical screening component comprises a housing 11, a supporting assembly 14 and a vibrating motor 13; the housing 11 is internally configured with a screening chamber, and the housing 11 is externally configured with a feeding port 112 and a discharging port 113, both of which are in communication with the screening chamber; the supporting assembly 14 comprises a supporting leg 141 and an elastic member 142; the elastic member 142 is connected between the housing 11 and the supporting leg 141; and the vibrating motor 13 is used to drive the screening mesh 12 to vibrate to realize mechanical screening of the granular aggregate.

[0048] It can be understood that the shape of the housing 11 can be, but is not limited to, a cuboid structure or a funnel structure, etc.

[0049] It can be understood that the elastic member 142 can be, but is not limited to, a spring or a rubber pad, etc.

[0050] In some embodiments of the present application, the number of the screening meshes 12 is one, and each screening mesh 12 is arranged in the screening chamber at a certain angle, and the number of the discharging ports 113 is two, one of which is arranged below the bottom end of the screening mesh 12, and the other is arranged below the screening mesh 12; the feeding port 112 is arranged above the high end of the screening mesh 12. The aggregate to be screened enters the screening chamber from the feeding port 112 and falls on the high end of the screening mesh 12, and the granular aggregate retained on the screening mesh 12 by mechanical screening is discharged from the discharging port 113 below the bottom end of the screening mesh 12, and the aggregate falling below the screening mesh 12 is discharged from the discharging port 113 below the screening mesh 12, so that two specifications of aggregate are obtained. In actual application, the screening mesh 12 with different mesh holes can be matched according to different requirements of the required aggregate specifications.

[0051] In some other embodiments of the present application, the number of the screening meshes 12 is at least two; each screening mesh 12 is arranged at a certain angle, and the two screening meshes 12 are arranged at intervals. The mesh hole diameter of the upper screening mesh 12 is greater than that of the lower screening mesh 12. The feeding port 112 is arranged above the high end of the uppermost screening mesh 12; each discharging port 113 corresponds to the low end of each screening mesh 12; and the discharging port 113 is also arranged below the lowermost screening mesh 12, i.e. the number of the discharging ports 113 is at least one more than the number of the screening meshes 12.

[0052] In some embodiments of the present application, the air flow grading component comprises an air inlet 21, an air outlet 22, an air inlet regulating valve 23 and an air outlet regulating valve 24. The cross-sectional area of the air inlet 21 is not less than that of the air outlet 22; the air inlet 21 is configured at the discharge end of the housing; the air outlet 22 is configured at the feed end of the housing; the air inlet regulating valve 23 is provided in the air inlet 21 for regulating the opening of the air inlet 21; and the air outlet regulating valve is provided in the air outlet 22 for regulating the opening of the air outlet 22, so that the flow rate and air flow field in the screening chamber can be more accurately adjusted, and the efficiency of air flow screening can be more accurately controlled.

[0053] In some embodiments of the present application, the number of air inlets 21 is one, and air enters the screening chamber from the one air inlet 21, and the air entering the screening chamber carries the powder in the screening chamber out of the screening chamber from the air outlet 22. It can be understood that the air inlet 21 is arranged near the discharge port 113, and the air outlet 22 is arranged near the feed port 112. Among them, the meaning of "the air inlet 21 is arranged near the discharge port 113" is that the air inlet 21 is arranged around the discharge port 113. The meaning of "the air outlet 22 is arranged near the feed port 112" is that the distance between the air outlet 22 and the feed port 112 is less than the distance between the air outlet 22 and the discharge port 113. The purpose of arranging the air inlet 21 near the discharge port 113 and the air outlet 22 near the feed port 112 is to increase the distance between the air inlet 21 and the air outlet 22.

[0054] In some embodiments of the present application, the air inlet 21 is arranged in at least two layers; the number of air inlets 21 in each layer is at least one; and one layer of air inlets 21 corresponds to one layer of screening nets 12. The number of air outlets 22 is one.

[0055] The closer to the feeding port 112, the smaller the caliber of the air inlet 21. Because the caliber of the air inlet 21 of each layer is different, the flow rate of the air entering from different air inlets 21 is different, so that the air can enter the screening chamber from different air inlets 21 according to the requirement of the powder on the wind intensity. For example, when the powder content in the feed is high and the powder content in the discharge is low, first, the opening of the air outlet adjusting valve 24 is increased, the air volume and air pressure of the air extractor are increased, and then the opening of each air inlet adjusting valve 23 is increased, so that the wind speed in the screening machine of the layer is increased, and the larger wind speed can carry more powder, so as to meet the production requirement. At the same time, according to the distribution of the material on the screen surface in the screening machine, the opening of each air inlet adjusting valve 23 is adjusted to optimize the air flow field distribution in the screening machine of the layer and further improve the screening efficiency. When the powder content in the feed is low and the water content is also low, first, the opening of the air outlet adjusting valve 24 is reduced, the air volume and air pressure of the air extractor are reduced, and then the opening of each air inlet adjusting valve 23 is reduced, so that the wind speed in the screening machine of the layer is reduced, until there is no dust overflow and the environmental protection requirement is met. At the same time, according to the distribution of the material on the screen surface in the screening machine, the opening of each air inlet adjusting valve 23 is adjusted to optimize the air flow field distribution in the screening machine of the layer and further improve the screening efficiency.

[0056] The closer to the feeding port 112, the smaller the caliber of the air inlet 21. Because the caliber of the air inlet 21 of each layer is different, the flow rate of the air entering from different air inlets 21 is different, so that the air can enter the screening chamber from different air inlets 21 according to the requirement of the powder on the wind intensity. For example, when the powder content in the feed is high and the powder content in the discharge is low, first, the opening of the air outlet adjusting valve 24 is increased, the air volume and air pressure of the air extractor are increased, and then the opening of each air inlet adjusting valve 23 is increased, so that the wind speed in the screening machine of the layer is increased, and the larger wind speed can carry more powder, so as to meet the production requirement. At the same time, according to the distribution of the material on the screen surface in the screening machine, the opening of each air inlet adjusting valve 23 is adjusted to optimize the air flow field distribution in the screening machine of the layer and further improve the screening efficiency. When the powder content in the feed is low and the water content is also low, first, the opening of the air outlet adjusting valve 24 is reduced, the air volume and air pressure of the air extractor are reduced, and then the opening of each air inlet adjusting valve 23 is reduced, so that the wind speed in the screening machine of the layer is reduced, until there is no dust overflow and the environmental protection requirement is met. At the same time, according to the distribution of the material on the screen surface in the screening machine, the opening of each air inlet adjusting valve 23 is adjusted to optimize the air flow field distribution in the screening machine of the layer and further improve the screening efficiency.

[0057] Because the air inlet 21 in the embodiment of the application is arranged close to the discharge port 113 and is distributed in multiple layers, multiple points and different sizes, the powder on the screening net 12 of each layer can be extracted, and the controllability is improved.

[0058] In some other embodiments of the application, the air inlets 21 are arranged in at least two layers, the number of air inlets 21 in each layer is at least one, and one layer of air inlets 21 corresponds to one layer of screening nets 12. The air outlets 22 are arranged in at least two layers, the number of air outlets 22 in each layer is at least one, and one layer of air outlets 22 corresponds to one layer of screening nets 12. For the air inlets 21 and the air outlets 22 of the same layer, the sum of the cross-sectional areas of the air inlets 21 is not less than the sum of the cross-sectional areas of the air outlets 22.

[0059] The shell 111 is constructed with at least two layers of air outlets 22, and the number of air outlets 22 in each layer is at least one, so that the air volume of each layer of air outlets and the distribution of the air flow field of each layer can be adjusted to meet the different requirements of the powder content in the discharge of each layer.

[0060] It can be understood that the air inlet adjusting valve 23 can be, but is not limited to, a rubber plug or a plug cover, etc. The air outlet adjusting valve 24 can be, but is not limited to, an electric butterfly valve, etc. The main purpose of arranging the air outlet adjusting valve 24 is to adjust the air volume and air speed; the main purposes of arranging the air inlet adjusting valve 23 are twofold: one is to adjust the air volume and air speed, and the other is to adjust the air flow field distribution.

[0061] In specific embodiments of the present application, the air flow grading component further comprises a fan assembly and a pipeline; the fan assembly is communicated with the air inlet 21 or the air outlet 22 through the pipeline. When the fan assembly is communicated with the air inlet 21 through the pipeline, the fan assembly blows the air outside the screening chamber into the screening chamber. When the fan assembly is communicated with the air outlet 22 through the pipeline, the fan assembly extracts the air in the screening chamber out of the screening chamber. It should be noted that when the air flow grading is performed, the local part of the screening machine can be positive pressure, but the whole should be negative pressure, so that the dust does not overflow and meets the environmental protection requirements.

[0062] In some embodiments, the fan assembly comprises an air extractor, which is communicated with the air outlet 22 through the pipeline.

[0063] In some other embodiments, the fan assembly comprises an air blower, which is communicated with the air inlet 21 through the pipeline.

[0064] In specific embodiments of the present application, a screening system is also provided, which comprises the aggregate grading device for building dry-mixed mortar in any of the above embodiments, and a dust collecting device; the dust collecting device is communicated with the screening chamber of the aggregate grading device for building dry-mixed mortar, and is used for collecting the powdery material from the screening chamber.

[0065] In some embodiments of the present application, the power source (such as a fan) of the air flow grading component can be connected between the mechanical screening component and the dust collecting device, and is used for extracting the powder in the screening chamber to the dust collecting device. In some other embodiments, the power source (such as a fan) of the air flow grading component can also be arranged in the dust collecting device, and is used as the air suction power source of the dust collecting device, so that a set of fan for extracting or blowing the powder in the screening chamber does not need to be designed separately, but a set of fan of the dust collecting device is shared, that is, the air suction power source of the dust collecting device can be used as the power source of the air flow grading component of the mechanical screening component.

[0066] The present application also provides a grading method of aggregate for building dry-mixed mortar, which adopts the aggregate grading device for building dry-mixed mortar in any of the above embodiments; the aggregate is loaded into the screening chamber of the mechanical screening component, the granular aggregate is mechanically screened by the screening net 12, and the screening chamber is forcibly ventilated by the air flow grading component to forcibly discharge the powdery aggregate in the screening chamber and realize the air flow grading of the aggregate.

[0067] The specific embodiment of the present application classifies the aggregate by mechanical screening and air flow classification, and places the aggregate on the screening net 12 in the screening chamber. The granular aggregate smaller than the mesh of the screening net 12 can pass through the mesh, and the granular aggregate larger than the mesh is intercepted on the screening net 12, and the powder is forced to be discharged from the screening chamber by the air flow classification component. Thus, the defect that the screening net of the conventional mechanical screening machine is easily blocked by the wet powder when the aggregate with high water content and high powder content is classified, and the yield and quality of the classification operation are greatly reduced is overcome. The probability of the wet powder adhering to the mesh of the screening net 12 and blocking the screening net is effectively reduced, the yield and quality of the mechanical screening are improved, and the total yield and quality of the classification operation are improved.

[0068] Moreover, the mechanical screening and the air flow classification are combined to classify the aggregate, so that the disadvantages of low efficiency of pure mechanical screening and high energy consumption of pure air flow classification are overcome, and a large amount of power consumption, equipment space and cost are saved.

[0069] In the specific embodiment of the present application, the aggregate is loaded into the screening chamber of the mechanical screening component, and the granular aggregate is mechanically screened by the screening net 12, which specifically includes:

[0070] The aggregate is loaded into the screening chamber from the feeding port 112 and is placed on the uppermost screening net 12. During the mechanical screening, the granular aggregate with large particle size is intercepted by the screening net 12 and is discharged from the corresponding discharge port 113. The granular aggregate with small particle size falls into the lower screening net 12 and is mechanically screened again, so that the multi-stage mechanical screening of the granular aggregate is completed.

[0071] In the specific embodiment of the present application, the air flow classification component is introduced to forcibly ventilate the screening chamber, and the powder aggregate in the screening chamber is forced to be discharged to realize the air flow classification of the aggregate, which specifically includes:

[0072] According to the powder content and water content of the feeding and the powder content requirement of the discharge, the opening degree of the second adjusting valve on the air outlet 22 is adjusted. According to the distribution of the air flow field in the screening chamber, the opening degree of the first adjusting valve of the air inlet is adjusted to forcibly ventilate the screening chamber and realize the air flow classification of the aggregate.

[0073] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A device for grading aggregates for dry building mortars, characterized in that, The application relates to a building dry-mixed mortar aggregate grading device. The mechanical screening component comprises a shell (11), a screening chamber is internally arranged in the shell (11), an inlet (112) and an outlet (113) are arranged on the shell (11), and a screening net (12) is arranged in the screening chamber; the mechanical screening component is used for mechanically screening granular aggregate on the screening net (12); The airflow classification component is used for forcibly ventilating the screening chamber to discharge powder aggregate in the screening chamber from the screening chamber, so that airflow classification of the aggregate is realized. The airflow classification component comprises: An air inlet (21) is arranged at the outlet end of the shell (11); The air inlet (21) is provided with at least two layers, one layer of the air inlet (21) corresponds to one layer of the screening net (12); the number of each layer of the air inlet (21) is at least two; for the air inlets (21) in the same layer, the closer to the inlet (112), the smaller the caliber of the air inlet (21); An air outlet (22) is arranged at the inlet end of the shell (11); the air outlet (22) is provided with at least two layers; one layer of the air outlet (22) corresponds to one layer of the screening net (12).

2. The aggregate classifying device for building dry mortar according to claim 1, characterized in that, The mechanical screening component further comprises: A supporting assembly (14) comprising a supporting leg (141) and an elastic member (142), the elastic member (142) is connected between the shell (11) and the supporting leg (141); A vibrating motor (13) is used for driving the screening net (12) to vibrate, so that mechanical screening of the granular aggregate is realized.

3. The aggregate classifying device for construction dry-mixed mortar according to claim 1, characterized in that, The screening net (12) is arranged at an angle and is provided with more than two layers; the mesh diameter of the screening net (12) in the upper layer is larger than that of the screening net (12) in the lower layer; The inlet (112) is arranged above the high end of the uppermost layer of the screening net (12); The low end of each screening net (12) corresponds to one outlet (113).

4. The aggregate classifying device for construction dry-mixed mortar according to claim 1, characterized in that, The airflow classification component further comprises: An air inlet adjusting valve (23) arranged in the air inlet (21) and used for adjusting the opening degree of the air inlet (21); An air outlet adjusting valve (24) arranged in the air outlet (22) and used for adjusting the opening degree of the air outlet (22).

5. The aggregate classifying device for construction dry-mixed mortar according to claim 1, characterized in that, The number of each layer of the air outlet (22) is at least one.

6. The aggregate fractioning device for dry building mortars according to any of claims 1-5, characterized in that, For the air inlets (21) and the air outlets (22) in the same layer, the sum of the cross-sectional areas of the air inlets (21) is not less than the sum of the cross-sectional areas of the air outlets (22).

7. A method for classifying aggregates for dry building mortars, characterized in that, The building dry-mixed mortar aggregate grading device is used for the following steps:

8. The method for classifying aggregates for construction dry mortars according to claim 7, characterized in that, The aggregate is introduced into the screening chamber of the mechanical screening component through the inlet (112), and the granular aggregate is mechanically screened by the screening net; meanwhile, the airflow classification component is introduced to forcibly ventilate the screening chamber, so that powder aggregate in the screening chamber is forcibly discharged, and airflow classification of the aggregate is realized. The aggregate is loaded into the screening chamber from the feed port (112) and placed on the uppermost screening mesh. During mechanical screening, the large-diameter granular aggregate is intercepted by the screening mesh and discharged from the corresponding discharge port (113) of the screening chamber; the small-diameter granular aggregate falls into the lower screening mesh for mechanical screening again.

9. The method for classifying aggregates for construction dry mortar according to claim 7, characterized in that, The simultaneous air flow classification component forcibly ventilates the screening chamber to forcibly discharge the powdery aggregate in the screening chamber, and realizes air flow classification of the aggregate, specifically comprising: According to the powder content and water content of the feed and the powder content requirement of the discharge, the opening degree of the air outlet adjusting valve (24) on the air outlet (22) is adjusted; according to the distribution of the air flow field in the screening chamber, the opening degree of the air inlet adjusting valve (23) of the air inlet (21) is adjusted to realize air flow classification of the aggregate.

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