A dry sand making line

Abstract

The present invention relates to a dry sand making line, belonging to the technical field of dry sand making. It comprises an installation frame, a sand making machine, a multi-stage vibrating screen, a powder removal device, an elevator and a concrete mixer, wherein the sand making machine is installed in the middle position of the installation frame, a cross beam is also provided on the top of the sand making machine, the multi-stage vibrating screen is installed on the top of the installation frame, the left bottom of the multi-stage vibrating screen and the sand making machine are fixedly connected through a double-tube buffer device, the bottom of the multi-stage vibrating screen and the top of the powder removal device are fixedly connected, the bottom of the powder removal device and the top of the concrete mixer are connected, the left bottom of the multi-stage vibrating screen is connected to the top of the concrete mixer through a three-way valve and an inclined tube buffer device, a lifting device is vertically installed at the rear side of the middle position of the installation frame, the bottom of the lifting device is connected to the bottom of the sand making machine, and the top of the lifting device is connected to the top of the multi-stage vibrating screen through a material dispersing pipe.

Description

Technical Field

[0001] The invention relates to a dry sand making line and belongs to the technical field of dry sand making. Background Art

[0002] With the continuous development of large-scale railway construction, highway construction, water conservancy projects and other projects, the rapid development of the construction industry. The market demand for sand and gravel aggregates continues to rise. Natural sand resources are becoming increasingly scarce and far from meeting market demand. Many regions restrict and prohibit the mining of natural sand. Mechanized sand and artificial sand making have gradually become the main sources of sand and gravel aggregates in the market. Today, as artificial sand making technology becomes increasingly mature, it is very convenient to use sand making equipment to produce machine-made sand.

[0003] Different particle sizes of machine-made sand have different uses. For example, the conventional range of machine-made sand for dry mortar is 0-2.36mm, and the conventional range of machine-made sand for concrete is 0-5mm. However, the existing sand making machines generally only produce one specification of dry sand, which cannot meet the needs of the current market. In addition, there are problems with the layout of various functional equipment of traditional sand making machines, which makes maintenance difficult and the equipment stability poor.

[0004] In view of the above-mentioned defects, the designers actively carried out research and innovation in order to create a dry sand making line to make it more valuable for industrial use. Summary of the invention

[0005] In order to solve the above technical problems, the purpose of the present invention is to provide a dry sand making line. The dry sand making line of the present invention changes the position of the sand making machine from the original side setting to setting it directly below the mounting bracket, and sets a crossbeam directly above the sand making machine for hanging the hoist, which is convenient for hoisting the sand making machine and performing subsequent maintenance and replacement. In addition, the present invention also sets a double-tube buffer device and an inclined tube buffer device as a connecting piece, which plays a buffering and impact-proof role, and improves the service life of the equipment. The material dispersing pipe used in connection between the elevator of the present invention and the multi-stage vibrating screen has a bulking effect, which can make the sand and gravel separation of the material be impacted and dispersed, thereby improving the subsequent screening efficiency. The dry sand making line of the present invention can be used to make fine sand by dry method alone, and can also make concrete wet sand by dry method. It has strong adaptability and broad application prospects.

[0006] The dry sand making line of the present invention comprises an installation stand, a sand making machine, a multi-stage vibrating screen, a powder removing device, an elevator and a concrete mixer.

[0007] The sand making machine is installed in the middle position of the mounting frame, and a cross beam is also provided on the top of the sand making machine. The multi-stage vibrating screen is installed on the top of the mounting frame. The bottom left side of the multi-stage vibrating screen and the sand making machine are fixedly connected through a double-tube buffer device, the bottom of the multi-stage vibrating screen and the top of the powder removal device are fixedly connected, the bottom of the powder removal device and the top of the concrete mixer are connected, the bottom left side of the multi-stage vibrating screen is connected to the top of the concrete mixer through a three-way valve and an inclined tube buffer device, a lifting device is vertically installed on the rear side of the middle position of the mounting frame, the bottom of the lifting device is connected to the bottom of the sand making machine, and the top of the lifting device is connected to the top of the multi-stage vibrating screen through a material discharge dispersion pipe.

[0008] Furthermore, the unloading dispersion pipe includes a main dispersion pipe and a distribution pipe, the main dispersion pipe is a straight cylindrical structure, the distribution pipe is a gradually expanding bell-mouth structure, the width of the distribution pipe is the same as the width of the multi-stage vibrating screen, and a plurality of impact-proof bulk material baffles are vertically arranged on the inner wall surface of the main dispersion pipe, and a plurality of bulk material baffles are staggered in the horizontal direction inside the distribution pipe.

[0009] Furthermore, the multi-stage vibrating screen includes a screening body and a gathering body located on the left side thereof, a fine material hopper is also provided below the screening body, and the top of the screening body is connected to a distribution pipe for feeding.

[0010] Furthermore, the inside of the screening body is provided with a coarse material circular vibrating screen, a medium material circular vibrating screen and a fine material circular vibrating screen, which are installed obliquely from top to bottom in sequence. The aperture diameter of the coarse material circular vibrating screen is 10 mm, the aperture diameter of the medium material circular vibrating screen is 5 mm, and the aperture diameter of the fine material circular vibrating screen is 2.4 mm. The coarse material circular vibrating screen, the medium material circular vibrating screen and the fine material circular vibrating screen are inclined to the lower left, and the inclination angle between the coarse material circular vibrating screen, the medium material circular vibrating screen and the fine material circular vibrating screen and the horizontal plane is 15 to 25°.

[0011] Furthermore, the aggregate body includes a medium hopper and a coarse material hopper arranged side by side from right to left, and an inclined coarse material baffle is arranged in the middle position of the middle hopper, which is used to guide the coarse material screened by the medium hopper and the coarse material hopper into the coarse material hopper; a fine hopper air inlet is opened on the left shell of the fine hopper, and a fine hopper exhaust port is obliquely arranged on the right shell of the fine hopper, the fine hopper exhaust port is inclined along the upper right, and the inclination angle with the horizontal plane is 60°, and a 10-15mm long fine hopper plug plate is provided on the vertical inner wall of the bottom inner wall of the fine hopper.

[0012] Furthermore, the interior of the powder removal device is divided into a powder removal chamber and a sedimentation chamber from left to right, and the powder removal chamber and the sedimentation chamber are welded and fixed into an integrated structure, and the powder removal chamber and the sedimentation chamber are connected through.

[0013] Furthermore, the upper half of the de-powdering chamber is a box structure, a rectangular feed port is provided on the top surface of the de-powdering chamber, and rectangular auxiliary electric dampers and main electric dampers are provided in sequence from top to bottom on the left side wall of the de-powdering chamber.

[0014] Furthermore, the lower part of the powder removal chamber is a fine material collecting hopper with an inverted quadrangular pyramid funnel structure, and a plurality of bulk material partitions are arranged inside the powder removal chamber, directly below the fine material collecting hopper.

[0015] Furthermore, the double-tube buffer device includes a buffer box with a rectangular structure, a coarse material inlet and a medium material inlet are symmetrically arranged at the top of the buffer box, and a return material outlet is arranged at the bottom of the buffer box.

[0016] The oblique tube buffer device comprises an oblique tube buffer box and a straight section outlet at the bottom of the oblique tube buffer box. The top of the oblique tube buffer box is provided with an oblique section inlet, and the oblique section inlet is connected to the top surface of the oblique tube buffer box in an inclined through manner.

[0017] By means of the above scheme, the present invention has at least the following advantages:

[0018] The dry sand making line of the present invention changes the position of the sand making machine from the original side setting to a setting directly below the mounting bracket, and sets a crossbeam directly above the sand making machine for hanging a hoist, which is convenient for hoisting the sand making machine and performing subsequent maintenance and replacement. In addition, the present invention also sets a double-tube buffer device and an inclined tube buffer device as connecting parts, which play a buffering and impact-proof role, thereby increasing the service life of the equipment. The discharge dispersion pipe used in connection between the elevator of the present invention and the multi-stage vibrating screen has a bulking effect, which can make the sand and gravel separation of the discharge material dispersed by impact, thereby improving the subsequent screening efficiency. The dry sand making line of the present invention can be used for dry-process fine sand alone, and can also be used for dry-process concrete wet sand. It has strong adaptability and broad application prospects.

[0019] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show a certain embodiment of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a front view structural schematic diagram of the dry sand making line of the present invention;

[0022] Figure 2 It is a right view structural schematic diagram of the dry sand making line of the present invention;

[0023] Figure 3 It is a schematic diagram of the top view of the dry sand making line of the present invention;

[0024] Figure 4 , 5 It is a structural schematic diagram of a material dispersing pipe in a dry sand making line of the present invention;

[0025] Figure 6 It is a schematic diagram of the structure of a multi-stage vibrating screen in a dry sand making line of the present invention;

[0026] Figure 7 It is a schematic diagram of the structure of a double-tube buffer device in a dry sand making line of the present invention;

[0027] Figure 8 It is a structural schematic diagram of a powder removal device in a dry sand making line of the present invention;

[0028] Fig. 9 It is a structural schematic diagram of the inclined tube buffer device in the dry sand making line of the present invention;

[0029] Among them, in the figure,

[0030] 1. Installation stand; 2. Sand making machine; 3. Multi-stage vibrating screen; 4. Powder removal device; 5. Elevator; 6. Double-tube buffer device; 7. Concrete mixer; 8. Dispersing pipe for material discharge; 9. Inclined pipe buffer device; 10. Three-way valve;

[0031] 21. Sand making machine entrance;

[0032] 31. Circular vibrating screen for coarse materials; 32. Circular vibrating screen for medium materials; 33. Circular vibrating screen for fine materials; 34. Hopper for coarse materials; 35. Hopper for medium materials; 36. Baffle for coarse materials; 37. Screening body; 38. Aggregate body; 39. Hopper for fine materials;

[0033] 401, powder removal chamber; 402, sedimentation chamber;

[0034] 41. Auxiliary electric damper; 42. Main electric damper; 43. Bulk material partition; 44. Powder removal outlet; 45. Feed inlet; 46. Powder outlet; 47. Sedimentation hopper; 48. Fine material collection hopper; 49. Fine material finished product hopper; 50. Fine material finished product outlet;

[0035] 61. Coarse material inlet; 62. Medium material inlet; 63. Return material outlet; 64. Buffer box;

[0036] 81. Main dispersion pipe; 82. Material distribution pipe; 83. Anti-impact bulk material baffle; 84. Bulk material baffle;

[0037] 91. Inclined section inlet; 92. Straight section outlet; 93. Inclined tube buffer box. DETAILED DESCRIPTION

[0038] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0039] See also Figures 1 to 3 A dry sand making line according to a preferred embodiment of the present invention comprises a mounting frame 1, a sand making machine 2, a multi-stage vibrating screen 3, a powder removal device 4, an elevator 5 and a concrete mixer 7.

[0040] The mounting platform 1 is a concrete steel frame structure, which is divided into two left and right areas. The sand making machine 2 is installed in the left area of ​​the mounting platform 1. A crossbeam is also provided on the top of the sand making machine 2 for hanging a hoist, which is convenient for hoisting the sand making machine 2 and for later maintenance and replacement. The multi-stage vibrating screen 3 is installed on the top of the mounting platform 1. The bottom left side of the multi-stage vibrating screen 3 and the sand making machine 2 are fixedly connected through a double-tube buffer device 6. The bottom of the multi-stage vibrating screen 3 is fixedly connected to the top of the powder removal device 4. The bottom of the powder removal device 4 is connected to the top of the concrete mixer 7. The bottom left side of the multi-stage vibrating screen 3 is connected to the top of the concrete mixer 7 through a three-way valve 10 and an inclined tube buffer device 9. A lifting device 5 is vertically installed on the rear side of the middle position of the mounting platform 1. Both sides of the lifting device 5 are connected to the mounting platform 1 through fixed cables. The fixed connection solves the problem that the lifting device 5 of the original sand making line can only be fixed on one side due to the right-side setting position of the lifting device 5. The bottom of the lifting device 5 is connected to the bottom of the sand making machine 2 through a slide pipe, and the top of the lifting device 5 is connected to the top of the multi-stage vibrating screen 3 through a material dispersing pipe 8;

[0041] See also Figure 4 and Figure 5 The material dispersing pipe 8 includes a main dispersing pipe 81 and a distribution pipe 82. The main dispersing pipe 81 is a straight cylindrical structure, and the distribution pipe 82 is a gradually expanding trumpet structure. The width of the distribution pipe 82 is the same as the width of the multi-stage vibrating screen 3. A plurality of anti-impact bulk material baffles 83 are vertically arranged on the inner side wall surface of the main dispersing pipe 81, which are used to preliminarily disperse the materials falling from the lifting device 5, and the dispersed materials form a dead material zone between the anti-impact bulk material baffles 83 to avoid direct impact of subsequent materials on the main dispersing pipe 81, thereby avoiding equipment wear. A plurality of bulk material baffles 84 are staggered in the horizontal direction inside the distribution pipe 82 to block and disperse the materials falling from the main dispersing pipe 81, thereby improving the screening efficiency of the multi-stage vibrating screen 3.

[0042] See also Figure 6The multi-stage vibrating screen 3 includes a screening body 37 and a collecting body 38 located on the left side thereof, a fine material hopper 39 is further provided below the screening body 37, the top of the screening body 37 is connected to the feeding pipe 82 for feeding, a coarse material circular vibrating screen 31, a medium material circular vibrating screen 32 and a fine material circular vibrating screen 33 are successively installed obliquely from top to bottom inside the screening body 37, the sieve hole diameter of the coarse material circular vibrating screen 31 is 10 mm, the sieve hole diameter of the medium material circular vibrating screen 32 is 5 mm, and the sieve hole diameter of the fine material circular vibrating screen 33 is 2.4 mm, the coarse material circular vibrating screen 31, the medium material circular vibrating screen 32 and the fine material circular vibrating screen 33 are inclined to the lower left, and the coarse material circular vibrating screen 31, the medium material circular vibrating screen 32 and the fine material circular vibrating screen 33 are inclined to the horizontal plane The angle is 15-25°; the aggregate body 38 includes a middle hopper 35 and a coarse hopper 34 arranged side by side from right to left, and an inclined coarse material baffle 36 is arranged in the middle position of the middle hopper 35, which is used to guide the coarse material screened by the middle hopper 35 and the coarse hopper 34 into the coarse material hopper 34; a fine hopper air inlet is provided on the left shell of the fine hopper 39, and a fine hopper exhaust port is inclined on the right shell of the fine hopper 39, and the fine hopper exhaust port is inclined along the upper right, and the inclination angle with the horizontal plane is 60°, and a 10-15mm long fine hopper insert is vertically arranged on the inner wall of the bottom surface of the fine hopper 39. The inner wall is used to form a dead material area between the suction hopper inserts to prevent the impact and wear of the material on the bottom wall of the fine hopper 39;

[0043] See also Figure 8The inside of the de-powdering device 4 is divided into a de-powdering chamber 401 and a sedimentation chamber 402 from left to right. The de-powdering chamber 401 and the sedimentation chamber 402 are welded and fixed into an integrated structure. The de-powdering chamber 401 and the sedimentation chamber 402 are connected through the integrated structure to realize de-powdering and sedimentation in one, which is convenient and fast. The upper part of the de-powdering chamber 401 is a box structure. A rectangular feed port 45 is provided on the top surface of the de-powdering chamber 401. A rectangular auxiliary electric damper 41 and a main electric damper 42 are provided on the left side wall of the de-powdering chamber 401 from top to bottom. The length of the auxiliary electric damper 41 is 1800 mm and the height is 350 mm. The length of the main electric damper 42 is 1800 mm and the height is 400 mm. The removal rate of sand and gravel materials can be adjusted by controlling the air volume of the auxiliary electric damper 41 and the main electric damper 42. If the air volume increases, larger dust particles can be removed together, and the dust removal amount increases. If the air volume decreases, some larger dust particles can be left behind, and the dust removal amount decreases. This adapts to the choice of dust removal amount by different enterprises and obtains fine materials with different dust contents. The lower half of the de-powdering chamber 401 is a fine material collecting hopper 48 with an inverted quadrangular pyramid funnel structure. Inside the de-powdering chamber 401, a plurality of bulk material baffles 43 are arranged directly below the fine material collecting hopper 48. Through the arrangement of the bulk material baffles 43, the sand and gravel materials loaded from the feed port 45 are impacted and dispersed multiple times to slow down the falling speed of the sand and gravel materials, thereby increasing the contact time between the dust removal wind force and the sand and gravel materials and improving the dust removal efficiency. The bulk material baffles 43 are made of stainless steel material, including a vertical fixed plate, an inclined plate and a hook plate. The inclined plate has an inclination angle of 45°, and the hook plate and the inclined plate are perpendicular to each other. The bulk material baffles 43 and the front and rear side walls of the de-powdering chamber 401 are arranged perpendicular to each other and fixed by welding. There are 7 bulk material partitions 43, 4 on the left and 3 on the right, which are arranged in a staggered manner. The inclined plates of the left bulk material partition 43 and the right bulk material partition 43 are perpendicular to each other, and the hook plates of the left bulk material partition 43 and the hook plates of the right bulk material partition 43 are on the same vertical plane. A replaceable wear-resistant liner is placed on the surface of each bulk material partition 43. The replaceable wear-resistant liner is a rectangular plate with a length of 1800mm and a width of 420mm. It is made of ceramic or manganese steel material and can be movably installed on the bulk material partition 43 and fixed by the hook plate on the bulk material partition 43. Due to the setting of the replaceable wear-resistant liner, the falling sand and gravel materials can be prevented from directly hitting the bulk material partition 43, thereby avoiding wear and extending the service life of the equipment.A vertical baffle is provided on the right side of the de-powdering chamber 401 to separate the de-powdering chamber 401 and the sedimentation chamber 402, and a de-powdering outlet 44 is provided on the vertical baffle; the upper part of the sedimentation chamber 402 is a box structure, and a powder outlet 46 is provided on the right side wall of the sedimentation chamber 402, and the lower part of the sedimentation chamber 402 is a sedimentation hopper 47 with an inverted quadrangular pyramid funnel structure, and the bottoms of the sedimentation hopper 47 and the fine material collecting hopper 48 are connected to the top of the fine material finished product hopper 49, and the bottom of the fine material finished product hopper 49 is provided with a fine material finished product outlet 50;.

[0044] See also Figure 7 The double-tube buffer device 6 includes a buffer box 64 of a rectangular parallelepiped structure, a coarse material inlet 61 and a medium material inlet 62 are symmetrically arranged on the top of the buffer box 64, and a return material outlet 63 is arranged at the bottom of the buffer box 64. When the double-tube buffer device 6 is in use, a layer of dead material will be deposited in the area between the coarse material inlet 61, the medium material inlet 62 and the return material outlet 63 to prevent subsequent dead material from impacting and wearing the buffer box 64, thereby improving the service life of the equipment;

[0045] See also Fig. 9 The inclined tube buffer device 9 includes an inclined tube buffer box 93 and a straight section outlet 92 located at the bottom of the inclined tube buffer box 93. The top of the inclined tube buffer box 93 is provided with an inclined section inlet 91. The inclined section inlet 91 and the top surface of the inclined tube buffer box 93 are obliquely connected, and the connection position is located on the right side of the top surface of the inclined tube buffer box 93. The inclined angle between the inclined section inlet 91 and the inclined tube buffer box 93 is 50°. The material entering from the inclined section inlet 91 slides down into the inclined tube buffer box 93 under the action of gravity. After the material enters, it first contacts and collides with the right side wall of the inclined tube buffer box 93. On the one hand, the right side wall is used to decelerate the material, and the impact and wear of the material on the inner wall of the inclined tube buffer box 93 is preliminarily weakened. On the other hand, the material flowing through the inside of the inclined tube buffer box 93 will be filled on the right side of the inclined tube buffer box 93 to achieve filling and covering, and the subsequent material and the inner wall of the inclined tube buffer box 93 are isolated, thereby preventing the material from directly impacting and wearing the inner wall of the inclined tube buffer box 93, thereby improving the service life of the equipment.

[0046] The working principle of the present invention is as follows:

[0047] The working process of the dry sand making line of the present invention is as follows: first, the sand making raw material is loaded into the sand making machine 2 from the sand making machine inlet 21, and after being crushed, it is input into the lifting device 5 from the bottom of the sand making machine through the chute, and after being lifted by the lifting device 5, it is dispersed through the material dispersing pipe 8 and then enters the multi-stage vibrating screen 3. After being screened by the multi-stage vibrating screen 3, it is divided into coarse powder with a particle size greater than 5mm and medium material with a particle size between 2.4mm and 5mm. If only dry sand making is required, the coarse material and medium material at this time will fall back into the sand making machine 2 through the double-tube buffer device 6. The sand is crushed and sieved until the dry sand making particle size is less than 2.4 mm. The fine material after three-layer screening by the multi-stage vibrating screen 3 is de-powdered by the de-powdering device 4 to obtain the finished sand and gravel, which can be output. If dry sand making is required, the finished sand and gravel with a particle size of less than 2.4 mm is input into the concrete mixer through a straight pipe, and the intermediate material with a particle size between 2.4 mm and 5 mm is also input into the concrete mixer through a three-way valve 10 and an inclined pipe buffer device 9, and is proportioned according to the ratio of the intermediate material and the fine material, and finally the dry sand making is completed.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the technical principles of the present invention, and these improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A dry sand making line, comprising a mounting frame (1), a sand making machine (2), a multi-stage vibrating screen (3), a powder removal device (4), a lifting device (5) and a concrete mixer (7), characterized in that: The sand making machine (2) is installed at the middle position of the mounting frame (1), and a crossbeam is also provided on the top of the sand making machine (2). The multi-stage vibrating screen (3) is installed on the top of the mounting frame (1). The left bottom of the multi-stage vibrating screen (3) and the sand making machine (2) are fixedly connected via a double-tube buffer device (6). The bottom of the multi-stage vibrating screen (3) and the top of the powder removal device (4) are fixedly connected. The bottom of the powder removal device (4) and the top of the concrete mixer (7) are connected. The left bottom of the multi-stage vibrating screen (3) is also connected to the top of the concrete mixer (7) via a three-way valve (10) and an inclined tube buffer device (9). A lifting device (5) is vertically installed at the rear side of the middle position of the mounting frame (1). The bottom of the lifting device (5) is connected to the bottom of the sand making machine (2), and the top of the lifting device (5) is connected to the top of the multi-stage vibrating screen (3) via a material dispersing pipe (8). The material dispersing pipe (8) comprises a main dispersing pipe (81) and a material dispersing pipe (82); the main dispersing pipe (81) is a straight cylindrical structure; the material dispersing pipe (82) is a gradually expanding bell-mouth structure; the width of the material dispersing pipe (82) is the same as the width of the multi-stage vibrating screen (3); a plurality of anti-impact bulk material baffles (83) are vertically arranged on the inner side wall surface of the main dispersing pipe (81); and a plurality of bulk material baffles (84) are staggeredly arranged in the horizontal direction inside the material dispersing pipe (82); The double-tube buffer device (6) comprises a buffer box (64) of a rectangular parallelepiped structure, a coarse material inlet (61) and a medium material inlet (62) are symmetrically arranged at the top of the buffer box (64), and a return material outlet (63) is arranged at the bottom of the buffer box (64); The inclined tube buffer device (9) comprises an inclined tube buffer box (93) and a straight section outlet (92) located at the bottom of the inclined tube buffer box (93); an inclined section inlet (91) is provided at the top of the inclined tube buffer box (93); and the inclined section inlet (91) and the top surface of the inclined tube buffer box (93) are connected in an inclined manner. The multi-stage vibrating screen (3) comprises a screening body (37) and a material collecting body (38) located on the left side thereof, a fine material hopper (39) is further provided below the screening body (37), and the top of the screening body (37) is connected to a material distribution pipe (82) for feeding; A coarse material circular vibrating screen (31), a medium material circular vibrating screen (32) and a fine material circular vibrating screen (33) are installed in the screening body (37) in an inclined manner from top to bottom, wherein the coarse material circular vibrating screen (31), the medium material circular vibrating screen (32) and the fine material circular vibrating screen (33) are inclined to the lower left, and the inclination angle between the coarse material circular vibrating screen (31), the medium material circular vibrating screen (32) and the fine material circular vibrating screen (33) and the horizontal plane is 15 to 25 degrees; The material collection body (38) comprises a middle material hopper (35) and a coarse material hopper (34) which are arranged side by side from right to left, and an inclined coarse material baffle (36) is arranged in the middle of the middle material hopper (35).

2. A dry sand making line according to claim 1, characterized in that: A fine hopper air inlet is provided on the left shell of the fine hopper (39), and a fine hopper exhaust port is obliquely provided on the right shell of the fine hopper (39). The fine hopper exhaust port is inclined along the upper right side and has an inclination angle of 60° with the horizontal plane. A fine hopper insert plate with a length of 10 to 15 mm is vertically provided on the inner wall of the bottom surface of the fine hopper (39).

3. A dry sand making line according to claim 1, characterized in that: The powder removal device (4) is internally divided into a powder removal chamber (401) and a sedimentation chamber (402) from left to right. The powder removal chamber (401) and the sedimentation chamber (402) are welded and fixed into an integrated structure. The powder removal chamber (401) and the sedimentation chamber (402) are connected through.

4. A dry sand making line according to claim 3, characterized in that: The upper half of the powder removal chamber (401) is a box structure, a rectangular feed opening (45) is provided on the top surface of the powder removal chamber (401), and rectangular auxiliary electric dampers (41) and main electric dampers (42) are provided in sequence from top to bottom on the left side wall of the powder removal chamber (401).

5. A dry sand making line according to claim 4, characterized in that: The lower half of the powder removal chamber (401) is a fine material collection hopper (48) with an inverted quadrangular pyramid funnel structure. A plurality of bulk material partitions (43) are arranged inside the powder removal chamber (401) and directly below the feed inlet (45).

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