Low-purity decoration garbage treatment production line
By setting up a classification production line and multi-stage screening equipment, the problem of poor air separation effect in the treatment of construction waste was solved, achieving efficient aggregate separation and purification, and improving the resource utilization rate.
Patent Information
- Application Number
- CN202520301715.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-25
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-02-25
AI Technical Summary
Existing construction waste treatment processes are simple, resulting in poor air separation effects, high impurity content in aggregates, difficulty in effective utilization, and low resource utilization rate.
A classification production line is set up to classify construction waste into three grades using a circular screen machine, and then sort and air-separate each grade. An inclined chain feeder, a multi-layer linear vibrating screen, and a roller vibrating screen are used for screening and impurity removal. Combined with manual sorting and a positive pressure fan, the separation and purification of aggregates of various sizes are achieved.
It improves the recycling rate and processing efficiency of construction waste, produces finished aggregates of various sizes and types, and reduces the impurity content in the aggregates.
Smart Images
Figure CN223861985U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of construction waste recycling and treatment technology, and in particular to a production line for treating low-purity renovation waste. Background Technology
[0002] With the rapid development of urbanization and industrialization in my country, construction projects are accelerating, and the amount of construction waste is increasing at an alarming rate. The overall resource utilization rate of construction waste in my country is less than 30%, far lower than the 90% in Europe and the United States and the 95% in Japan and South Korea. At present, the traditional treatment methods are mainly landfill and pile-up. In economically developed areas, there are construction waste production lines, but the production line technology is simple, the air separation effect is relatively poor, the impurity content of recycled aggregate is high, and the produced aggregate is continued to be used in landfill.
[0003] Construction waste has a complex composition, mainly consisting of bricks, tiles, concrete blocks, gypsum board, wood, plastics, rubber, glass products, and other impurities. Current processing technology mainly involves simple sorting and crushing. For construction waste with particularly complex compositions, the crushed product from air classifiers is difficult to utilize effectively after conventional processing. Utility Model Content
[0004] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention may be realized and obtained by means of the structures particularly pointed out in the description and other accompanying drawings.
[0005] The purpose of this utility model is to overcome the above-mentioned shortcomings and provide a low-purity construction waste treatment production line. By setting up a classification production line, different pre-treatment modules are set up according to the different mixed types of construction waste. The construction waste raw materials are classified into three levels by a circular screen and the aggregates of the three levels are sorted and air-separated to achieve secondary utilization. The recyclable aggregates separated in the end are crushed twice and then screened to produce finished aggregates of various sizes. The recycling rate is high and the processing efficiency is high.
[0006] This utility model provides a low-purity construction waste treatment production line, including a feeding module configured as an inclined chain plate feeder, a grading and screening module located at the end of the feeding module, and a medium aggregate transfer module located at the end of the grading and screening module. The grading and screening module is a circular screen, which is equipped with at least two layers of single-layer linear vibrating screens. The single-layer linear vibrating screens divide the circular screen into a large aggregate layer, a medium aggregate layer, and a small aggregate and slag layer from top to bottom. A channel is provided at the end of the medium aggregate layer, and the medium aggregate layer is connected to the medium aggregate transfer module through the channel. The medium aggregate transfer module is a roller vibrating screen.
[0007] An inclined chain plate feeder is used to transport construction waste to the grading and screening module to achieve uniform and stable feeding. The feeding frequency can be adjusted in real time according to the production line. Both the circular screen and the single-layer linear vibrating screen can vibrate independently, screening low-purity construction waste into at least three groups according to different diameters. This facilitates subsequent impurity removal steps based on different material diameters. The upper layer screens out large-diameter aggregates, preferably materials larger than 200mm. The middle layer screens out medium-diameter aggregates, preferably materials between 40-200mm. The lower layer screens out small-diameter aggregates and slag, preferably materials between 0-40mm. The medium aggregate layer guides medium aggregates within a certain diameter range to the medium aggregate transfer module, which is a roller vibrating screen.
[0008] In some embodiments, the aggregate transfer module includes at least two stages of roller vibrating screens, namely a first roller vibrating screen and a second roller vibrating screen, which are independently set and located below the first roller vibrating screen. Setting at least two stages of roller vibrating screens ensures that the entire screening structure has sufficient length to achieve thorough screening. The aggregate screened by the roller vibrating screens is divided into two grades and discharged through their respective outlets, realizing both screening and transfer functions. During the screening process, as the aggregate continuously rolls and separates, the air separation and impurity removal module set on the side can more easily remove impurities.
[0009] In some embodiments, the roller vibrating screen includes a screen shaft and screen discs spaced apart on the screen shaft. Several screen shafts are spaced apart within the roller vibrating screen, and each screen shaft is connected to a drive motor. The spacing between the screen shafts is adjustable. Several screen discs are spaced apart on a single screen shaft, and these discs mesh intermittently with the screen discs on the screen shafts on both sides. During rotation, smaller aggregates fall through the gaps below, achieving screening. The specific structure of the roller vibrating screen with adjustable spacing can be found in existing technology.
[0010] In some embodiments, the screen discs on adjacent screen shafts are staggered and the distance between the screen shafts is greater than the length of the screen disc, and the edges of the screen discs are raised. The staggered arrangement of the screen discs and the distance between the screen shafts can effectively avoid the problem of material jamming on the screen shafts. The raised edges of the screen discs give the aggregate good bouncing function during rolling and also help to avoid material jamming.
[0011] In some embodiments, the single-layer linear vibrating screen disposed on the top layer of the circular screen is a screen plate, and the single-layer linear vibrating screen disposed on the bottom layer of the circular screen is an anti-clogging screen. According to the actual screening process, the single-layer linear vibrating screen at the top layer is set as a conventional screen plate, while the single-layer linear vibrating screen at the bottom layer is equipped with a special anti-clogging screen to avoid clogging because the material particles being screened are smaller.
[0012] In some embodiments, the end of the large aggregate layer is connected to a manual sorting conveyor belt, which has at least 12 stations, each equipped with a detachable sorting hopper. Because the large aggregates are identifiable by the naked eye due to their large diameter, a manual sorting conveyor belt is used. During the conveying process, stations are located on the side where workers select impurities from the conveyor belt to improve the purity of the aggregates. The detachable sorting hoppers are used to collect the impurities selected by the workers.
[0013] In some embodiments, the end of the small aggregate and slag layer is connected to a small aggregate single vibrating screen. The upper layer of the small aggregate single vibrating screen is the small aggregate layer, and the lower layer is the slag layer. The end of the small aggregate layer is connected to a ventilation separator to remove impurities. The small aggregate single vibrating screen is used to separate small aggregates and slag. Since the building materials have already undergone initial screening, the material entering the small aggregate and slag layer has a high purity. Therefore, it is screened by the single vibrating screen. The screened small aggregate is introduced into the air separator for air separation and impurity removal, while the screened slag is uniformly introduced into a storage bin for waste collection.
[0014] In some embodiments, an air-separation impurity removal module is also included. This air-separation impurity removal module consists of several positive pressure fans arranged at intervals. The air-separation impurity removal module is located on the side of the manual sorting conveyor belt and the aggregate transfer module. The positive pressure fans are used to screen out lighter impurities on the conveyor belt and the vibrating screen to ensure the cleanliness of the aggregate. Since the production line is relatively long, positive pressure fans are installed along the route to adapt to the structure of the production line for impurity removal. The positive pressure fans can be installed on the side of the main body of the manual sorting conveyor belt and the aggregate transfer module, or they can be independently mounted or fixed to the wall. The specific installation method can be adapted to the changes in the actual equipment structure, which will not be elaborated here. After air separation, the lighter impurities fall into the storage bin. The frequency and blowing angle of the fans are adjustable.
[0015] In some embodiments, a transfer silo is also included. Rolling belts are installed at the ends of the aggregate transfer module, the manual sorting conveyor belt, and the air separator outlet. These rolling belts connect the transfer silo to the aggregate transfer module, the manual sorting conveyor belt, and the air separator outlet. A crushing module is installed at the outlet of the transfer silo. Large, medium, and small aggregates are screened to remove impurities using different screening methods and then uniformly transported to the transfer silo via rolling belts. The transfer silo is used to uniformly store the three sets of screened aggregates for subsequent further refining and crushing steps.
[0016] In some embodiments, the crushing module includes a vertically arranged jaw crusher and an impact crusher. The jaw crusher is located above the impact crusher, and its outlet corresponds to the inlet of the impact crusher. The outlet of the impact crusher is connected to a finished product grading screen. The jaw crusher and impact crusher are used to uniformly crush the screened aggregate. The jaw crusher works by using the squeezing and bending action of its two jaw plates to coarsely or medium crush aggregates of various particle sizes. The aggregate after the initial crushing is guided through the outlet to the impact crusher for further fine crushing. The crushed aggregate is then guided to the finished product grading screen for screening. Preferably, the finished product grading screen has at least two layers of screens to separate the aggregate into three groups of different diameters: 0-5mm, 5-10mm, and 10-31.5mm.
[0017] By adopting the above technical solution, the beneficial effects of this utility model are:
[0018] This utility model sets up a classification production line, and sets up different pre-treatment modules according to the different mixed types of construction waste. The construction waste raw materials are classified into three levels by a circular screen machine, and the aggregates of the three levels are sorted and air-separated to achieve secondary utilization. The recyclable aggregates separated in the end are crushed twice and then screened to produce finished aggregates of various sizes. The recycling rate is high and the processing efficiency is high.
[0019] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure.
[0020] Undoubtedly, such and other objects of this invention will become more apparent after the following detailed description of the preferred embodiments, which are illustrated in various accompanying drawings and illustrations.
[0021] To make the above and other objects, features and advantages of this utility model more apparent and understandable, one or more preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description
[0022] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.
[0023] In the accompanying drawings, the same parts use the same reference numerals, and the drawings are schematic and not necessarily drawn to actual scale.
[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only one or more embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on such drawings without creative effort.
[0025] Figure 1 This is a schematic diagram of the overall process flow of the production line in some embodiments of this utility model;
[0026] Figure 2 This is a simplified schematic diagram of the overall structure of the processing production line in some embodiments of this utility model.
[0027] Explanation of key figure labels:
[0028] 1. Material feeding module;
[0029] 2. Hierarchical screening module;
[0030] 21. Large aggregate layer; 22. Medium aggregate layer; 23. Small aggregate and slag layer;
[0031] 3. Medium aggregate transfer module;
[0032] 4. Manual sorting of conveyor belts;
[0033] 5. Small aggregate single vibrating screen;
[0034] 6. Air classifier;
[0035] 7. Air separation and impurity removal module;
[0036] 8. Transit warehouse;
[0037] 9. Crushing module;
[0038] 91. Jaw crusher; 92. Impact crusher;
[0039] 10. Finished product grading sieve. Detailed Implementation
[0040] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present utility model and are not intended to limit the present utility model.
[0041] Furthermore, it should be understood in the description of this utility model that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0042] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral unit; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. However, specifying a direct connection indicates that the two main bodies at the connection point are not connected through a transitional structure, but are simply connected to form a whole through a connecting structure. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.
[0043] In this utility model, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. 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 this utility model. 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.
[0044] Reference Figure 1-2 , Figure 1 This is a schematic diagram of the overall process flow of the production line in some embodiments of this utility model; Figure 2 This is a simplified schematic diagram of the overall structure of the processing production line in some embodiments of this utility model.
[0045] According to some embodiments of the present invention, the present invention provides a low-purity construction waste treatment production line, including a feeding module 1 configured as an inclined chain plate feeder, a grading and screening module 2 located at the end of the feeding module 1, and a medium aggregate transfer module 3 located at the end of the grading and screening module 2.
[0046] The grading and screening module 2 is a circular screen, which is equipped with at least two layers of single-layer linear vibrating screens. The single-layer linear vibrating screens divide the circular screen into a large aggregate layer 21, a medium aggregate layer 22, and a small aggregate and slag layer 23 from top to bottom. The medium aggregate layer 22 is provided with a channel at its end, and the medium aggregate layer 22 is connected to the medium aggregate transfer module 3 through the channel. The medium aggregate transfer module 3 is a roller vibrating screen.
[0047] An inclined chain plate feeder is used to transport construction waste to the grading and screening module 2 to achieve uniform and stable feeding. The feeding frequency can be adjusted in real time according to the production line. Both the circular screen and the single-layer linear vibrating screen can vibrate independently, screening low-purity construction waste into at least three groups according to different diameters. This facilitates subsequent impurity removal steps based on different material diameters. The upper layer screens out large-diameter aggregates, preferably materials larger than 200mm. The middle layer screens out medium-diameter aggregates, preferably materials between 40-200mm. The lower layer screens out small-diameter aggregates and slag, preferably materials between 0-40mm. The medium aggregate layer 22 guides medium aggregates within a certain diameter range to the medium aggregate transfer module 3, which is a roller vibrating screen.
[0048] According to some embodiments of this utility model, optionally, the aggregate transfer module 3 includes at least two stages of roller vibrating screens, namely, a first roller vibrating screen and a second roller vibrating screen set independently, with the second roller vibrating screen located below the first roller vibrating screen. Setting at least two stages of roller vibrating screens ensures that the entire screening structure has sufficient length to achieve thorough screening. The aggregate screened by the roller vibrating screens is divided into two stages and discharged through their respective outlets, realizing both screening and transfer functions. During the screening process, as the aggregate continuously rolls and separates, the side-mounted air separation and impurity removal module 7 can more easily remove impurities.
[0049] According to some embodiments of this utility model, optionally, the roller vibrating screen includes a screen shaft and screen discs spaced apart on the screen shaft. Several screen shafts are spaced apart within the roller vibrating screen, and each screen shaft is connected to a drive motor. The spacing between the screen shafts is adjustable. Several screen discs are spaced apart on a single screen shaft, and these discs mesh intermittently with the screen discs on the screen shafts on both sides. During rotation, smaller aggregates fall through the gaps below, achieving screening. The specific structure of the roller vibrating screen with adjustable spacing can be found in the prior art.
[0050] According to some embodiments of this utility model, optionally, the screen discs on two adjacent screen shafts are staggered, and the distance between the screen shafts is greater than the length of the screen disc, with the edge of the screen disc protruding. The staggered arrangement of the screen discs and the distance between the screen shafts can effectively avoid the problem of material jamming on the screen shafts. The protruding edge of the screen disc provides good bouncing function for the aggregate during rolling, and also helps to prevent material jamming.
[0051] According to some embodiments of this utility model, optionally, the single-layer linear vibrating screen disposed on the top layer of the circular screen is a screen plate, and the single-layer linear vibrating screen disposed on the bottom layer of the circular screen is an anti-clogging screen. Based on the actual screening process, the single-layer linear vibrating screen at the top layer is set as a conventional screen plate, while the single-layer linear vibrating screen at the bottom layer, due to the smaller particle size of the material being screened, is equipped with a special anti-clogging screen to prevent clogging.
[0052] According to some embodiments of this utility model, optionally, the end of the large aggregate layer 21 is connected to a manual sorting conveyor belt 4, which is provided with at least 12 workstations, each of which is equipped with a detachable sorting hopper. Because the large aggregate has a large diameter, it can be identified by the naked eye; therefore, a manual sorting conveyor belt 4 is provided. During the conveying process, workstations are set up on the side, where workers are positioned to select impurities on the conveyor belt, improving the purity of the aggregate. Detachable sorting hoppers are provided to collect the impurities selected by the workers.
[0053] According to some embodiments of this utility model, optionally, the end of the small aggregate slag layer 23 is connected to a small aggregate single vibrating screen 5. The upper layer of the small aggregate single vibrating screen 5 is a small aggregate layer, and the lower layer is a slag layer. The end of the small aggregate layer is connected to a ventilation separator 6 to remove impurities. The small aggregate single vibrating screen 5 is used to separate small aggregates and slag. Since the building materials have already undergone initial screening, the material entering the small aggregate slag layer 23 has a high purity. Therefore, it is screened by a single vibrating screen. The screened small aggregate is introduced into the air separator 6 for air separation and impurity removal, while the screened slag is uniformly introduced into a storage bin for waste collection.
[0054] According to some embodiments of this utility model, optionally, the production line also includes an air separation and impurity removal module 7. This module consists of several positive pressure fans arranged at intervals, located on the sides of the manual sorting conveyor belt 4 and the aggregate transfer module 3. The positive pressure fans are used to screen out lighter impurities from the conveyor belt and vibrating screen, ensuring the cleanliness of the aggregate. Since the production line is relatively long, positive pressure fans are installed along the route to adapt to the structure of the production line for impurity removal. The positive pressure fans can be installed on the sides of the manual sorting conveyor belt 4 and the aggregate transfer module 3, or they can be independently mounted or fixed to a wall. The specific installation method can be adapted to changes in the actual equipment structure, which will not be elaborated here. After air separation, the lighter impurities fall into a storage bin. The frequency and blowing angle of the fans are adjustable.
[0055] Optionally, according to some embodiments of this utility model, the production line further includes a transfer bin 8. Rolling belts are installed at the ends of the aggregate transfer module 3, the manual sorting roller 4, and the air separator 6. These rolling belts connect the transfer bin 8 to the transfer bin 8. A crushing module 9 is installed at the outlet of the transfer bin 8. Large, medium, and small aggregates are screened to remove impurities using different screening methods and then uniformly transported to the transfer bin 8 via rolling belts. The transfer bin 8 is used to uniformly store the three sets of screened aggregates for subsequent further refining and crushing steps.
[0056] According to some embodiments of this utility model, optionally, the crushing module 9 includes a vertically arranged jaw crusher 91 and an impact crusher 92. The jaw crusher 91 is located above the impact crusher 92, and the outlet of the jaw crusher 91 corresponds to the inlet of the impact crusher 92. The outlet of the impact crusher 92 is connected to the finished product grading screen 10. The jaw crusher 91 and the impact crusher 92 are used to uniformly crush the screened aggregate. The working principle of the jaw crusher 91 is to use the squeezing and bending action of the two jaw plates to coarsely or medium crush aggregates of various particle sizes. The aggregate after the initial crushing is guided through the outlet to the impact crusher 92 for further fine crushing. The crushed aggregate is then guided to the finished product grading screen 10 for screening. Preferably, the finished product grading screen 10 is provided with at least two layers of screens to separate the aggregate into three groups of different diameters: 0-5mm, 5-10mm, and 10-31.5mm.
[0057] It should be understood that the embodiments disclosed herein are not limited to the specific processing steps or materials disclosed herein, but should be extended to equivalent substitutions of such features as understood by those skilled in the art. It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting.
[0058] The term "embodiment" in this specification refers to a specific feature or characteristic described in connection with an embodiment that is included in at least one embodiment of the present invention. Therefore, phrases or "embodiments" appearing in various places throughout the specification do not necessarily refer to the same embodiment.
[0059] Furthermore, the described features or characteristics may be incorporated into one or more embodiments in any other suitable manner. In the above description, specific details, such as thickness, quantity, etc., are provided to provide a comprehensive understanding of embodiments of the present invention. However, those skilled in the art will understand that the present invention can be implemented without the aforementioned one or more specific details or may be implemented using other methods, components, materials, etc.
Claims
1. A low-purity renovation waste treatment production line, characterized in that, Comprising a feeding module, which is a chain plate feeder arranged obliquely; a grading screening module located at the end of the feeding module; a medium aggregate transfer module located at the end of the grading screening module; the grading screening module is a circular screen, at least two layers of single-layer linear vibrating screens are arranged in the circular screen, the circular screen is divided into a large aggregate layer, a medium aggregate layer and a small aggregate and soil residue layer from top to bottom by the single-layer linear vibrating screens, a passage is arranged at the end of the medium aggregate layer, the medium aggregate layer communicates with the medium aggregate transfer module through the passage, and the medium aggregate transfer module is a roller vibrating screen.
2. The low-purity renovation waste processing production line according to claim 1, characterized in that, The medium aggregate transfer module comprises at least two levels of roller vibrating screens, which are a first roller vibrating screen and a second roller vibrating screen arranged independently.
3. The low-purity renovation waste processing production line according to claim 2, characterized in that, The roller vibrating screen comprises a screen shaft and screen discs arranged on the screen shaft, a plurality of screen shafts are arranged in the roller vibrating screen, each screen shaft is connected with a driving motor, and the spacing between the screen shafts is adjustable.
4. The low-purity renovation waste processing production line according to claim 3, characterized in that, The screen discs on adjacent two screen shafts are arranged staggeredly, the spacing between the screen shafts is greater than the length of the screen disc, and the edge of the screen disc is protruded.
5. The low-purity renovation waste processing production line according to claim 1, characterized in that, The single-layer linear vibrating screen arranged at the top layer of the circular screen is a screen plate, and the single-layer linear vibrating screen arranged at the bottom layer of the circular screen is a anti-blocking screen.
6. The low-purity renovation waste processing production line according to claim 1, characterized in that, The end of the large aggregate layer is connected with an artificial sorting roller belt, at least 12 workstations are arranged on the artificial sorting roller belt, and a detachable sorting hopper is arranged on each workstation.
7. The low-purity renovation waste processing production line according to claim 6, characterized in that, The end of the small aggregate and soil residue layer is connected with a small aggregate single vibrating screen, the upper layer of the small aggregate single vibrating screen is a small aggregate layer, the lower layer of the small aggregate single vibrating screen is a soil residue layer, and the end of the small aggregate layer is connected with an air separator to remove impurities.
8. The low-purity renovation waste processing production line according to claim 6, characterized in that, The air separation and impurity removal module comprises a plurality of interval arranged positive pressure fans, and the air separation and impurity removal module is arranged at the side of the artificial sorting roller belt and the medium aggregate transfer module.
9. The low-purity renovation waste processing production line according to claim 7, characterized in that, A transfer bin is further arranged, and rolling belts are arranged at the end of the medium aggregate transfer module, the end of the artificial sorting roller belt and the outlet of the air separator, the end of the medium aggregate transfer module, the end of the artificial sorting roller belt and the outlet of the air separator are connected with the transfer bin through the rolling belts, and a crushing module is arranged at the outlet of the transfer bin.
10. The low-purity renovation waste processing production line according to claim 9, characterized in that, The crushing module comprises a jaw crusher and an impact crusher arranged vertically, the jaw crusher is located above the impact crusher, the outlet of the jaw crusher corresponds to the inlet of the impact crusher, and a finished product grading screen is connected to the outlet of the impact crusher.