Comb tooth type fixed screen chute

Abstract

The utility model relates to the technical field of belt conveyor chutes, in particular to a comb tooth type fixed screen chute, which is characterized in that two symmetrical side walls of a feeding chute shell are respectively provided with a feed port and an oversize discharge port, the bottom surface of the feeding chute shell is provided with an undersize discharge port, the inside of the feeding chute shell is fixedly connected with a fixed screen plate component, and the fixed screen plate component is fixedly connected with the feeding chute shell. A plurality of trapezoidal sieve holes are formed in the fixed sieve plate assembly, the fixed sieve plate assembly is arranged above the under-sieve discharging port, the feeding port and the on-sieve discharging port are both formed above the fixed sieve plate assembly, and the on-sieve discharging ports of the two material chute shells are connected with the feeding ends of the two crushers correspondingly. According to the utility model, the existing feeding chute is transformed, the whole equipment does not need to be redesigned, the working load of the crusher is reduced, the working efficiency of the crusher is improved, the investment of screening equipment is reduced, and the whole rotating space is saved; reconstruction investment cost is reduced, and maintenance and replacement are convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of belt conveyor chutes, in particular to a comb-tooth fixed screen chute. Background Art

[0002] The coal blending and crushing system mainly includes coal blending, crushing, caching and output processes, with the aim of providing qualified PCI coal for the blast furnace.

[0003] In the coal blending system of the prior art, different types of coal are blended according to the blending requirements and then transported to the crushing system by a coal blending output belt conveyor; in the crushing system, the blended coal is fed to the crusher through a chute, and the crushed material is fed to the cache system via an output belt conveyor; in the cache system, qualified pulverized coal is loaded into the cache bin, and when the subsequent belt conveyor is overhauled, the material can be discharged through the discharge facility at the bottom of the bin without affecting the production operation; under normal circumstances, it does not enter the cache bin, but is fed to the output process through a three-way distributor and transported to the user end by the subsequent belt conveyor.

[0004] In the prior art, a belt conveyor is generally designed at the front end of the crusher. The feed chute and the crusher are generally used in a one-for-one manner. There is generally no need for a pre-screening device between the feed chute and the crusher. Small particle materials with a diameter of less than 20 mm cannot be screened. Small particle materials with a diameter of less than 20 mm will increase the load of the crusher after entering the crusher.

[0005] To design a separate pre-screening device between the feed chute and the crusher requires consideration of the reserved space for on-site equipment and the connection relationship between the various existing components, which is difficult. Utility Model Content

[0006] The utility model aims to provide a comb-tooth fixed screen chute, which adds a comb-tooth screen plate to the feeding chute on the basis of the existing design, so as to form a pre-screening between the feeding chute and the crusher to prevent small-sized materials with a diameter of less than 20 mm from entering the crusher.

[0007] In order to achieve the above technical effects, the utility model provides a comb-tooth fixed screen chute including a feeding belt conveyor, the discharging end of the feeding belt conveyor is connected with a three-way distributor, the three-way distributor is arranged below the material belt conveyor, the three-way distributor includes a feeding end and two discharging ends; the feeding end of the three-way distributor is connected with the discharging end of the feeding belt conveyor, the two discharging ends of the three-way distributor are connected with a feeding chute, the two feeding chutes are symmetrical, and the discharging ends of the two feeding chutes are connected The two crushers are connected to a crusher, which is arranged below the feeding chute. The discharge ends of the two crushers are connected to a discharge hopper, which is arranged below the crusher. The discharge ends of the two discharge hoppers are commonly connected to a discharge belt conveyor, which is arranged below the discharge hopper. The two feeding chutes each include a feeding chute shell, which is a rectangular box. The two symmetrical side walls of the feeding chute shell are respectively provided with a feed port and an upper screen discharge port. The bottom surface of the feeding chute shell is provided with a screen. The lower discharge port, the fixed screen plate assembly is fixedly connected inside the feed chute shell, and a plurality of trapezoidal screen holes are arranged on the fixed screen plate assembly. The fixed screen plate assembly is arranged above the lower discharge port, and the feed port and the upper discharge port are arranged above the fixed screen plate assembly. The feed chute shell is inclined, and the upper discharge port is arranged obliquely below the feed port. The feed ports of the two material chute shells are respectively connected to the two discharge ends of the three-way distributor, and the upper discharge ports of the two material chute shells are respectively connected to the feed ends of the two crushers. The under-screen discharge ports of the two material chute shells are connected to a screening chute together. The screening chute includes two feed ends and one discharge end. The under-screen discharge ports of the two material chute shells are respectively connected to the two feed ends of the screening chute. The discharge end of the screening chute is connected to a discharge chute. The discharge end of the discharge chute is connected to a discharge belt conveyor. The screening chute is arranged between the two crushers. Feed chutes are connected between the over-screen discharge ports of the two material chute shells and the feed ends of the two crushers.

[0008] Furthermore, the fixed screen plate assembly includes a comb-tooth screen plate I and a comb-tooth screen plate II, which are both fixedly connected between two parallel side walls of the feeding chute shell where no feed port and screen outlet are provided. Multiple comb-tooth screen plates I and comb-tooth screen plates II are provided, and the number of multiple comb-tooth screen plates I and multiple comb-tooth screen plates II are the same, and the length from the feed port to the screen outlet is similar. Multiple comb-tooth screen plates I and multiple comb-tooth screen plates II are arranged in a descending step-like manner in a staggered manner. In the adjacent comb-tooth screen plates I and II, the front end of the comb-tooth screen plate I is crimped to the rear end of the comb-tooth screen plate II, and the front end of the comb-tooth screen plate II is crimped to the rear end of another comb-tooth screen plate I. Multiple trapezoidal notches I are provided along the comb-tooth screen plate I, and multiple trapezoidal notches II are provided on the comb-tooth screen plate II. Multiple trapezoidal notches I and multiple trapezoidal notches II form trapezoidal sieve holes.

[0009] Furthermore, the comb-tooth sieve plate I includes a top plate I, a trapezoidal groove I is provided at the front end of the top plate I, and multiple trapezoidal grooves I are linearly evenly distributed along the length direction of the top plate I, multiple comb-tooth portions I are formed between the multiple trapezoidal grooves I, and a connecting portion I is formed at the rear end of the top plate I where the trapezoidal groove I is not provided. The comb-tooth sieve plate II includes a top plate II, a trapezoidal groove II is provided at the front end of the top plate II, and multiple trapezoidal grooves II are linearly evenly distributed along the length direction of the top plate II, multiple comb-tooth portions II are formed between the multiple trapezoidal grooves II, and a connecting portion II is formed at the rear end of the top plate II where the trapezoidal groove II is not provided. Multiple comb-tooth portions I and multiple comb-tooth portions II are alternately arranged along the length direction of the comb-tooth sieve plate I and the comb-tooth sieve plate II, and the front ends of multiple comb-tooth portions I in adjacent comb-tooth sieve plates I and comb-tooth sieve plates II are crimped on the connecting portion II, and multiple comb-tooth portions II are crimped on another connecting portion I.

[0010] Further, each of the comb-tooth sieve plates I includes a support tube I, which is fixedly connected to the bottom surface of the top plate I, and the support tube I is arranged at the lower end of the connecting portion I. Along the length and direction, both ends of the support tube I extend out of the support tube I, and the support tube I extends out of the two ends of the support tube I to form an extended portion I. Each of the comb-tooth sieve plates II includes a support tube II, which is fixedly connected to the bottom surface of the top plate II, and the support tube II is arranged at the lower end of the connecting portion II. Along the length and direction, both ends of the support tube II extend out of the support tube II, and the support tube II extends out of the two ends of the support tube II to form an extended portion II. A support plate is fixedly connected to the inner walls of the two parallel side walls of the feeding chute shell where the feed port and the discharge port on the screen are not provided. A plurality of grooves are linearly and evenly distributed on the top surface of the support plate along the length direction of the support plate. The number of the plurality of grooves is the same as the sum of the number of the plurality of comb tooth sieve plates I plus the number of the plurality of comb tooth sieve plates II. The extension parts I of the plurality of comb tooth sieve plates I and the extension parts II of the plurality of comb tooth sieve plates II are connected one by one in the plurality of grooves. A pressure plate is connected to the inner walls of the two parallel side walls of the feeding chute shell where the feed port and the discharge port on the screen are not provided. The pressure plate is crimped on the top surfaces of the plurality of extension parts I and the plurality of extension parts II.

[0011] Furthermore, the pressure plate is provided with a plurality of through holes II, which are linearly evenly distributed along the length direction of the pressure plate, and the two parallel side walls of the feeding chute shell where the feed port and the screen outlet are not provided are provided with a plurality of through holes I, the plurality of through holes I are coaxial with the plurality of through holes II, and the plurality of through holes I and the plurality of through holes II are fixedly connected by fasteners.

[0012] Furthermore, an inspection port is provided on the top surface of the feed chute shell, and a top cover is connected to the inspection port.

[0013] Furthermore, a handle is provided on the top surface of the top cover, and two handles are provided.

[0014] The beneficial effects of the utility model are as follows: the utility model arranges fixed screen plate assemblies in the two feeding chutes so that small-sized materials with a diameter of less than 20 mm can be screened to the bottom of the fixed screen plate assembly through the trapezoidal screen holes; after screening, small-sized materials with a diameter of less than 20 mm that pass through the fixed screen plate assembly no longer enter the crusher but enter the screening chute and directly enter the discharging belt conveyor; the coal-blending materials above the fixed screen plate assembly enter the crusher through the discharging port on the screen, thereby avoiding small-sized materials with a diameter of less than 20 mm from entering the crusher and preventing the crusher from running at a high load; in addition, the utility model does not arrange a separate screening component but transforms the existing feeding chute without considering transforming or redesigning other components; the utility model reduces the workload of the crusher, improves the working efficiency of the crusher, reduces the investment in screening equipment, saves the overall space of the transfer station, reduces the transformation investment cost, and facilitates maintenance and replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model in use state;

[0016] Figure 2 It is a structural schematic diagram of the feeding chute of the utility model;

[0017] Figure 3 It is a structural schematic diagram of the feeding chute of the utility model;

[0018] Figure 4 For this utility model Figure 3 AA section view;

[0019] Figure 5 For this utility model Figure 3 Middle BB section view;

[0020] Figure 6 This is a structural schematic diagram of the comb screen plate I of the utility model;

[0021] Figure 7 For this utility model Figure 6 CC section view;

[0022] Figure 8 This is a structural schematic diagram of the comb screen plate II of the utility model;

[0023] Fig. 9 For this utility model Figure 8 DD cross-sectional view;

[0024] Fig.10 This is a schematic diagram of the structure of the support plate of the utility model;

[0025] Fig.11 It is a structural schematic diagram of the pressing plate of the utility model.

[0026] In the figure: 1. Feed chute shell; 101. Feed inlet; 102. Discharge port above the screen; 103. Discharge port below the screen; 104. Inspection port; 105. Top cover; 106. Handle; 107. Through hole Ⅰ; 2. Fixed screen plate assembly; 3. Comb screen plate Ⅰ; 301. Top plate Ⅰ; 3011. Trapezoidal notch Ⅰ; 3012. Comb part Ⅰ; 3013. Connecting part Ⅰ; 302. Support pipe Ⅰ; 303. Extension part Ⅰ; 4. Comb screen plate Ⅱ; 401 .Top plate Ⅱ; 4011. Trapezoidal notch Ⅱ; 4012. Comb tooth part Ⅱ; 4013. Connecting part Ⅱ; 402. Support pipe Ⅱ; 403. Extension part Ⅱ; 5. Feed belt conveyor; 6. Three-way distributor; 7. Feed chute; 8. Screen chute; 9. Crusher; 10. Discharge hopper; 11. Discharge chute; 12. Discharge belt conveyor; 13. Support plate; 1301. Groove; 14. Press plate; 1401. Through hole Ⅱ; 15. Trapezoidal sieve hole. DETAILED DESCRIPTION

[0027] like Figure 1-Figure 11As shown, the utility model is a comb-tooth fixed screen chute including a feeding belt conveyor 5, the discharging end of the feeding belt conveyor 5 is connected with a three-way distributor 6, the three-way distributor 6 is arranged below the feeding belt conveyor 5, and the three-way distributor 6 includes a feeding end and two discharging ends; the feeding end of the three-way distributor 6 is connected to the discharging end of the feeding belt conveyor 5, and the two discharging ends of the three-way distributor 6 are connected with feeding chutes, the two feeding chutes are symmetrical, and the discharging ends of the two feeding chutes are connected with crushers 9, which are arranged below the feeding chute. The discharging ends of the crushers 9 are connected to the discharging hoppers 10, which are arranged below the crushers 9. The discharging ends of the two discharging hoppers 10 are commonly connected to the discharging belt conveyor 12, which is arranged below the discharging hoppers 10. The two feeding chutes each include a feeding chute shell 1, which is a rectangular box, and the two symmetrical side walls of the feeding chute shell 1 are respectively provided with a feed port 101 and an upper screen discharging port 102, and the bottom surface of the feeding chute shell 1 is provided with an under-screen discharging port 103. The inside of the feeding chute shell 1 is solid. The fixed screen plate assembly 2 is fixedly connected, and a plurality of trapezoidal screen holes 15 are arranged on the fixed screen plate assembly 2. The fixed screen plate assembly 2 is arranged above the under-screen discharge port 103. The feed port 101 and the over-screen discharge port 102 are both arranged above the fixed screen plate assembly 2. The feed chute shell 1 is tilted, and the over-screen discharge port 102 is arranged obliquely below the feed port 101. The feed ports 101 of the two material chute shells 1 are respectively connected to the two discharge ends of the three-way distributor 6, and the over-screen discharge ports 102 of the two material chute shells 1 are respectively connected to the feed ends of the two crushers 9. The under-screen discharge port 103 of the chute shell 1 is commonly connected to a screening chute 8, and the screening chute 8 includes two feed ends and one discharge end. The under-screen discharge ports 103 of the two material chute shells 1 are respectively connected to the two feed ends of the screening chute 8, and the discharge end of the screening chute 8 is connected to a discharge chute 11, and the discharge end of the discharge chute 11 is connected to a discharge belt conveyor 12. The screening chute 8 is arranged between the two crushers 9, and the feed chute 7 is connected between the over-screen discharge ports 102 of the two material chute shells 1 and the feed ends of the two crushers 9.

[0028] The utility model sets a fixed screen plate assembly 2 in two feeding chutes so that small-sized materials with a diameter of less than 20 mm can be screened to the bottom of the fixed screen plate assembly 2 through the trapezoidal screen holes 15. The inclined setting of the fixed screen plate assembly 2 improves the screening efficiency of the coal-blending materials when passing through the fixed screen plate assembly 2. After screening, the small-sized materials with a diameter of less than 20 mm that pass through the fixed screen plate assembly 2 no longer enter the crusher 9 but enter the screening chute 8. The small-sized materials with a diameter of less than 20 mm in the screening chute 8 directly enter the discharging belt conveyor 12 through the discharging chute 11. The coal-blending materials above the fixed screen plate assembly 2 enter the crusher 9 through the above-screen discharging port 102, thereby preventing the small-sized materials with a diameter of less than 20 mm from entering the crusher 9 and preventing the crusher 9 from operating at a high load. In addition, the utility model does not set a separate screening component, but transforms the existing feeding chute, without considering the transformation or redesign of other components. The arrangement of the trapezoidal sieve hole 15 requires that the longer bottom side of the trapezoid be arranged close to the upper discharge port 102 of the sieve, and the detailed size of the trapezoidal sieve hole 15 is considered to enable the discharge of small-sized materials with a diameter of less than 20 mm.

[0029] The fixed screen plate assembly 2 includes a comb-tooth screen plate I3 and a comb-tooth screen plate II4, which are fixedly connected between two parallel side walls of the feeding chute housing 1 where the feed port 101 and the screen discharge port 102 are not provided. The comb-tooth screen plates I3 and the comb-tooth screen plates II4 are provided in plurality, and the plurality of comb-tooth screen plates I3 and the plurality of comb-tooth screen plates II4 are the same in number, and the length from the feed port 101 to the screen discharge port 102 is similar, and the plurality of comb-tooth screen plates I3 and the plurality of comb-tooth screen plates II4 are staggered in descending steps. The front end of the comb-tooth sieve plate Ⅰ3 in the adjacent comb-tooth sieve plate Ⅱ4 is pressed on the rear end of the comb-tooth sieve plate Ⅱ4, and the front end of the comb-tooth sieve plate Ⅱ4 is pressed on the rear end of another comb-tooth sieve plate Ⅰ3. A plurality of trapezoidal notches Ⅰ3011 are provided along the comb-tooth sieve plate Ⅰ3, and a plurality of trapezoidal notches Ⅱ4011 are provided on the comb-tooth sieve plate Ⅱ4. The plurality of trapezoidal notches Ⅰ3011 and the plurality of trapezoidal notches Ⅱ4011 are formed into a trapezoidal sieve hole 15 in a row. The comb-tooth sieve plate Ⅰ3 includes a top plate Ⅰ301, and the front end of the top plate Ⅰ301 is provided Trapezoidal notch Ⅰ3011, multiple trapezoidal notch Ⅰ3011 are linearly evenly distributed along the length direction of top plate Ⅰ301, multiple comb teeth Ⅰ3012 are formed between multiple trapezoidal notch Ⅰ3011, and the part of the rear end of top plate Ⅰ301 without trapezoidal notch Ⅰ3011 forms a connecting part Ⅰ3013, the comb teeth screen plate Ⅱ4 includes top plate Ⅱ401, the front end of top plate Ⅱ401 is provided with trapezoidal notch Ⅱ4011, multiple trapezoidal notch Ⅱ4011 are linearly evenly distributed along the length direction of top plate Ⅱ401, multiple trapezoidal notch Ⅰ3012 are formed between multiple trapezoidal notch Ⅰ3011, and the comb teeth screen plate Ⅱ4 includes top plate Ⅱ401, the front end of top plate Ⅱ401 is provided with trapezoidal notch Ⅱ4011, multiple trapezoidal notch Ⅱ4011 are linearly evenly distributed along the length direction of top plate Ⅱ401, multiple trapezoidal notch Ⅰ3012 are formed between multiple comb teeth Ⅰ3012, and the part of the rear end of top plate Ⅰ301 without trapezoidal notch Ⅰ3011 forms a connecting part Ⅰ3013. A plurality of comb tooth portions II4012 are formed between the notches II4011, a connecting portion II4013 is formed at the rear end of the top plate II401 where no trapezoidal notches II4011 are provided, a plurality of comb tooth portions I3012 and a plurality of comb tooth portions II4012 are alternately arranged along the length direction of the comb tooth sieve plates I3 and II4, front ends of a plurality of comb tooth portions I3012 in adjacent comb tooth sieve plates I3 and II4 are crimped onto the connecting portion II4013, and a plurality of comb tooth portions II4012 are crimped onto another connecting portion I3013.

[0030] Since the front ends of multiple comb teeth parts I3012 are crimped onto the connecting part II4013, and multiple comb teeth parts II4012 are crimped onto another connecting part I3013, the size of the trapezoidal sieve hole 15 is smaller than the size of the trapezoidal notch I3011 and the trapezoidal notch II3011. Generally, it is required that the comb teeth parts I3012 and the comb teeth parts II4012 are completely crimped onto the connecting part II4013 and the connecting part I3013 in the width direction. At this time, the height of the trapezoid of the trapezoidal sieve hole 15 is the height of the trapezoid of the trapezoidal notch I3011 and the trapezoidal notch II3011 minus the width of the connecting part II4013. When designing the specific shape and size of the trapezoidal notch I3011 and the trapezoidal notch II3011, this situation should be considered.

[0031] Each comb-tooth sieve plate Ⅰ3 includes a support tube Ⅰ302, which is fixedly connected to the bottom surface of the top plate Ⅰ301, and the support tube Ⅰ302 is arranged at the lower end of the connecting part Ⅰ3013. Along the length and direction, both ends of the support tube Ⅰ302 extend out of the support tube Ⅰ302, and the support tube Ⅰ302 extends out of the two ends of the support tube Ⅰ302 to form an extension part Ⅰ303. Each comb-tooth sieve plate Ⅱ4 includes a support tube Ⅱ402, which is fixedly connected to the top plate On the bottom surface of II401, support pipe II402 is arranged at the lower end of connecting portion II4013, and along the length and direction, both ends of support pipe II402 extend out of support pipe II402, and support pipe II402 extends out of both ends of support pipe II402 to form extending portion II403, and the inner walls of two parallel side walls of the feed chute shell 1 without the feed port 101 and the screen discharge port 102 are fixedly connected with support plates 13, and along the length direction of the support plate 13, the top surface of the support plate 13 is linearly evenly distributed. There are a plurality of grooves 1301, the number of the plurality of grooves 1301 is the same as the sum of the number of the plurality of comb-tooth sieve plates Ⅰ3 and the number of the plurality of comb-tooth sieve plates Ⅱ4, the extensions Ⅰ303 of the plurality of comb-tooth sieve plates Ⅰ3 and the extensions Ⅱ403 of the plurality of comb-tooth sieve plates Ⅱ4 are connected one by one in the plurality of grooves 1301, and the inner walls of the two parallel side walls of the feed chute housing 1 where the feed port 101 and the upper screen discharge port 102 are not provided are connected with a pressing plate 14, and the pressing plate 14 is pressed on the plurality of extensions Ⅰ30 3 and the top surface of multiple extensions Ⅱ403; the pressure plate 14 is provided with multiple through holes Ⅱ1401, and the multiple through holes Ⅱ1401 are linearly evenly distributed along the length direction of the pressure plate 14, and the two parallel side walls of the feeding chute shell 1 where the feed port 101 and the screen discharge port 102 are not provided are provided with multiple through holes Ⅰ107, and the multiple through holes Ⅰ107 are coaxial with the multiple through holes Ⅱ1401 one by one, and the multiple through holes Ⅰ107 and the multiple through holes Ⅱ1401 are fixedly connected by fasteners.

[0032] The support tube Ⅰ302, the support tube Ⅱ402, the support plate 13 and the pressure plate 14 are arranged to fix the comb-tooth sieve plate Ⅰ3 and the comb-tooth sieve plate Ⅱ4, and the extension part Ⅰ303 and the extension part Ⅱ403 are arranged so that the support plate 13 and the pressure plate 14 do not interfere with the top plate Ⅰ301 and the top plate Ⅱ401, and the pressure plate 14 and the feeding chute shell 1 are fastened to facilitate loading and unloading and replacement.

[0033] An inspection port 104 is provided on the top surface of the feed chute shell 1, and a top cover 105 is connected to the inspection port 104. A handle 106 is provided on the top surface of the top cover 105, and two handles 106 are provided.

[0034] The provision of the inspection port 104 and the top cover 105 facilitates the inspection of the feed chute, and the provision of the handle 106 opens or closes the top cover 105 .

[0035] The utility model reduces the working load of the crusher, improves the working efficiency of the crusher, reduces the investment in screening equipment, saves the overall space of the transfer station, reduces the transformation investment cost, and is convenient for maintenance and replacement.

Claims

1. A comb-tooth fixed screen chute, comprising a feeding belt conveyor (5), the discharging end of the feeding belt conveyor (5) being connected to a three-way distributor (6), the three-way distributor (6) being arranged below the feeding belt conveyor (5), the three-way distributor (6) comprising a feeding end and two discharging ends; the feeding end of the three-way distributor (6) being connected to the discharging end of the feeding belt conveyor (5), and the two discharging ends of the three-way distributor (6) being connected to a feeding chute The two feeding chutes are symmetrical, the discharge ends of the two feeding chutes are connected to a crusher (9), the crusher (9) is arranged below the feeding chute, the discharge ends of the two crushers (9) are connected to a discharge hopper (10), the discharge hopper (10) is arranged below the crusher (9), the discharge ends of the two discharge hoppers (10) are commonly connected to a discharge belt conveyor (12), the discharge belt conveyor (12) is arranged below the discharge hopper (10), and the characteristics are: The two feeding chutes each comprise a feeding chute shell (1), the feeding chute shell (1) being a rectangular box, the two symmetrical side walls of the feeding chute shell (1) being respectively provided with a feed port (101) and an upper screen discharge port (102), the bottom surface of the feeding chute shell (1) being provided with an under-screen discharge port (103), the inside of the feeding chute shell (1) being fixedly connected with a fixed screen plate assembly (2), the fixed screen plate assembly (2) being provided with a plurality of trapezoidal screen holes (15), the fixed screen plate assembly (2) being arranged above the under-screen discharge port (103), the feed port (101) and the upper screen discharge port (102) being both arranged above the fixed screen plate assembly (2), the feeding chute shell (1) being arranged obliquely, the upper screen discharge port (102) being arranged obliquely below the feed port (101), the feed ports (101) of the two feeding chute shells (1) being respectively connected to a three-way connection. The two discharge ends of the distributor (6) are connected, the upper screen discharge ports (102) of the two material chute shells (1) are respectively connected to the feed ends of the two crushers (9), and the lower screen discharge ports (103) of the two material chute shells (1) are commonly connected to a screening chute (8). The screening chute (8) includes two feed ends and one discharge end. The lower screen discharge ports (103) of the two material chute shells (1) are respectively connected to the two feed ends of the screening chute (8). The discharge end of the screening chute (8) is connected to a discharge chute (11), and the discharge end of the discharge chute (11) is connected to a discharge belt conveyor (12). The screening chute (8) is arranged between the two crushers (9), and a feed chute (7) is connected between the upper screen discharge ports (102) of the two material chute shells (1) and the feed ends of the two crushers (9).

2. A comb-tooth fixed screen chute according to claim 1, characterized in that: The fixed screen plate assembly (2) includes a comb-tooth screen plate I (3) and a comb-tooth screen plate II (4), and the comb-tooth screen plate I (3) and the comb-tooth screen plate II (4) are fixedly connected between two parallel side walls of the feeding chute shell (1) where the feeding port (101) and the screen discharge port (102) are not provided. The comb-tooth screen plates I (3) and the comb-tooth screen plates II (4) are provided in plurality, and the plurality of comb-tooth screen plates I (3) and the plurality of comb-tooth screen plates II (4) are the same in number and have a similar length from the feeding port (101) to the screen discharge port (102). The tooth sieve plates II (4) are arranged in a staggered manner in descending steps. In the adjacent comb-tooth sieve plates I (3) and comb-tooth sieve plates II (4), the front end of the comb-tooth sieve plate I (3) is pressed onto the rear end of the comb-tooth sieve plate II (4), and the front end of the comb-tooth sieve plate II (4) is pressed onto the rear end of another comb-tooth sieve plate I (3). A plurality of trapezoidal notches I (3011) are provided along the comb-tooth sieve plate I (3), and a plurality of trapezoidal notches II (4011) are provided on the comb-tooth sieve plate II (4). The plurality of trapezoidal notches I (3011) and the plurality of trapezoidal notches II (4011) are arranged in a row to form a trapezoidal sieve hole (15).

3. A comb-tooth fixed screen chute according to claim 2, characterized in that: The comb-tooth sieve plate I (3) comprises a top plate I (301), a trapezoidal notch I (3011) is provided at the front end of the top plate I (301), a plurality of trapezoidal notch I (3011) are linearly evenly distributed along the length direction of the top plate I (301), a plurality of comb-tooth portions I (3012) are formed between the plurality of trapezoidal notch I (3011), a portion of the rear end of the top plate I (301) where the trapezoidal notch I (3011) is not provided forms a connecting portion I (3013), and the comb-tooth sieve plate II (4) comprises a top plate II (401), a trapezoidal notch II (4011) is provided at the front end of the top plate II (401), a plurality of trapezoidal notch II (4011) are linearly evenly distributed along the length direction of the top plate I (301), a plurality of comb-tooth portions I (3012) are formed between the plurality of trapezoidal notch I (3011), a portion of the rear end of the top plate I (301) where the trapezoidal notch I (3011) is not provided forms a connecting portion I (3013), A plurality of comb tooth portions II (4012) are evenly distributed linearly in the length direction, and a plurality of trapezoidal notches II (4011) are used to form a plurality of comb tooth portions II (4012). A portion of the rear end of the top plate II (401) where the trapezoidal notches II (4011) is not provided forms a connecting portion II (4013). The plurality of comb tooth portions I (3012) and the plurality of comb tooth portions II (4012) are alternately arranged along the length direction of the comb tooth sieve plate I (3) and the comb tooth sieve plate II (4). The front ends of the plurality of comb tooth portions I (3012) in the adjacent comb tooth sieve plates I (3) and the comb tooth sieve plates II (4) are crimped onto the connecting portion II (4013), and the plurality of comb tooth portions II (4012) are crimped onto another connecting portion I (3013).

4. A comb-tooth fixed screen chute according to claim 3, characterized in that: Each of the comb-tooth sieve plates I (3) includes a support tube I (302), which is fixedly connected to the bottom surface of the top plate I (301), and is disposed at the lower end of the connecting portion I (3013). Along the length and direction, both ends of the support tube I (302) extend out of the support tube I (302), and the support tube I (302) extends out of both ends of the support tube I (302) to form an extended portion I (303). Each of the comb-tooth sieve plates II (4) includes a support tube II (402), which is fixedly connected to the bottom surface of the top plate II (401), and is disposed at the lower end of the connecting portion II (4013). Along the length and direction, both ends of the support tube II (402) extend out of the support tube II (402), and the support tube II (402) extends out of both ends of the support tube II (402) to form an extended portion II (403). The two parallel side wall inner walls of the feeding chute shell (1) not provided with the feeding port (101) and the screen discharge port (102) are both fixedly connected with a support plate (13), and a plurality of grooves (1301) are linearly and evenly distributed on the top surface of the support plate (13) along the length direction of the support plate (13), and the number of the plurality of grooves (1301) is the same as the sum of the number of the plurality of comb tooth sieve plates I (3) and the number of the plurality of comb tooth sieve plates II (4), and the extension parts I (303) of the plurality of comb tooth sieve plates I (3) and the extension parts II (403) of the plurality of comb tooth sieve plates II (4) are connected one by one in the plurality of grooves (1301), and the two parallel side wall inner walls of the feeding chute shell (1) not provided with the feeding port (101) and the screen discharge port (102) are both connected with a pressing plate (14), and the pressing plate (14) is pressed on the top surfaces of the plurality of extension parts I (303) and the plurality of extension parts II (403).

5. The comb-tooth fixed screen chute according to claim 4, characterized in that: The pressure plate (14) is provided with a plurality of through holes II (1401), and the plurality of through holes II (1401) are linearly evenly distributed along the length direction of the pressure plate (14); the two parallel side walls of the feeding chute shell (1) where no feed port (101) and screen discharge port (102) are provided are provided with a plurality of through holes I (107); the plurality of through holes I (107) are coaxial with the plurality of through holes II (1401), and the plurality of through holes I (107) and the plurality of through holes II (1401) are fixedly connected by fasteners.

6. A comb-tooth fixed screen chute according to any one of claims 1 to 5, characterized in that: An inspection opening (104) is provided on the top surface of the feed chute shell (1), and a top cover (105) is connected to the inspection opening (104).

7. The comb-tooth fixed screen chute according to claim 6, characterized in that: A handle (106) is provided on the top surface of the top cover (105), and two handles (106) are provided.

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