A complete set of equipment for perlite sand production line

Abstract

The present invention belongs to the field of non-metallic mineral sand making. A complete set of equipment for a perlite sand production line includes a raw material bin, a first crusher, a rotary dryer, a second crusher, a crushing mill, a screening assembly, a finished product bin and a return assembly. The raw material bin is correspondingly connected to the first crusher; a first conveying unit is provided between the first crusher and the rotary dryer; a second conveying unit is provided between the rotary dryer and the second crusher; a third conveying unit is provided between the second crusher and the crushing mill; a fourth conveying unit is provided between the crushing mill and the screening assembly; and the finished product bin is connected to the finished product discharge port of the screening assembly. The present invention has the advantages of good product particle shape, adjustable product particle size, and compact production line structure. It can ensure the orderly implementation of each process of the entire production line, improve the work efficiency of each process, and optimize the energy efficiency structure of the production line.

Description

Technical Field

[0001] The invention belongs to the field of non-metallic mineral sand making, and specifically relates to a complete set of perlite sand production line equipment. Background Art

[0002] Perlite is brittle and light. It can expand rapidly under heating conditions. It has the characteristics of sound insulation, heat insulation, high temperature resistance, strong adsorption, small capacity, stable chemical properties, acid and alkali resistance, etc., so it has a wide range of uses. At present, expanded perlite is the most widely used type of lightweight thermal insulation material in my country. According to statistics from relevant departments, the current application ratio of expanded perlite in the market in my country is: about 60% in construction projects, about 30% in heat pipe insulation, and about 10% in decorative materials.

[0003] At present, the main pearlite sand making process in my country is: raw ore - coarse crushing (jaw crusher) - drying (rotary dryer) - medium crushing (impact crusher, hammer crusher) - sand making (vertical shaft impact crusher, roller crusher) - screening and grading (linear vibrating screen). The outstanding problems of pearlite sand making are: (1) the performance of pearlite sand making equipment is uneven, the energy consumption is high, and there is a lack of dedicated pearlite sand making equipment; (2) the pearlite sand making equipment is seriously over-crushed, and the product particle size distribution cannot be adjusted; (3) the screening equipment is inefficient and the equipment reliability is poor; (4) the product particle shape is poor, the strength is low, and it is easy to crush after expansion. Summary of the invention

[0004] The purpose of the present invention is to provide a complete set of perlite sand making production line equipment in view of the above-mentioned problems and shortcomings. The equipment has a reasonable structural design, good product particle shape, adjustable product particle size and compact production line structure. It can ensure the orderly implementation of each process of the entire production line, improve the work efficiency of each process and optimize the energy efficiency structure of the production line.

[0005] To achieve the above purpose, the technical solution adopted is:

[0006] A complete set of perlite sand production line equipment, including:

[0007] Raw material warehouse;

[0008] A first crusher, wherein the discharge port of the raw material bin is correspondingly connected to the feed port of the first crusher;

[0009] A rotary dryer, wherein a first conveying unit is provided between the discharge port of the first crusher and the feed port of the rotary dryer;

[0010] a second crusher, wherein a second conveying unit is provided between the discharge port of the rotary dryer and the feed port of the second crusher;

[0011] A crushing mill, wherein a third conveying unit is provided between the discharge port of the second crushing mill and the feed port of the crushing mill;

[0012] A screening assembly, wherein a fourth conveying unit is provided between the discharge port of the grinding mill and the feed port of the screening assembly;

[0013] A finished product bin connected to the finished product discharge port of the screening assembly; and

[0014] A material return component, wherein the feed end of the material return component is connected to the screen material outlet of the screening component, and the discharge end of the material return component is connected to the feed end of the crushing mill or the third conveying unit.

[0015] According to the pearlite sand production line complete set of the present invention, preferably, the first crusher is a jaw crusher, the raw material bin is arranged on the upper part of the jaw crusher, and the second crusher is a hammer crusher;

[0016] The first conveying unit comprises a first belt conveyor, a first bucket elevator and a first transfer silo which are arranged in sequence, and a first vibrating feeder is arranged between the discharge port of the first transfer silo and the rotary dryer;

[0017] The second conveying unit is a second belt conveyor, and the second belt conveyor is arranged obliquely;

[0018] The third conveying unit includes a second bucket elevator and a second transfer bin, the crushers are at least two groups, and a second vibrating feeder is provided between the second transfer bin and each of the crushers.

[0019] According to the perlite sand production line complete set of the present invention, preferably, the fourth conveying unit includes a third belt conveyor, a third bucket elevator and a third transfer silo.

[0020] According to the complete set of perlite sand production line equipment of the present invention, preferably, the screening assembly includes a screening frame, a primary screening unit arranged on the upper part of the screening frame, and a secondary screening unit arranged in the middle part of the screening frame, the finished product bin is arranged at the lower part of the screening frame, the primary screening unit includes at least two groups of primary gyratory screens arranged side by side, and a fourth belt conveyor and a fourth bucket elevator are arranged between the third transfer bin and each of the primary gyratory screens;

[0021] The secondary screening unit includes at least one group of secondary gyratory screens, part of the screening material outlets of the primary gyratory screen are correspondingly connected to the feed port of the secondary gyratory screen, and the other screening material outlets of the primary gyratory screen and each material outlet of the secondary gyratory screen are connected to the corresponding finished product bin.

[0022] According to the perlite sand making production line complete set of the present invention, preferably, the return material component includes a fifth belt conveyor and a sixth belt conveyor, the fifth belt conveyor is correspondingly arranged at the lower part of the material outlet on the first-level gyratory screen, the first end of the sixth belt conveyor is arranged correspondingly to the blanking end of the fifth belt conveyor, and the second end of the sixth belt conveyor is connected to the feed end of the crushing mill or the third conveying unit.

[0023] According to the complete set of perlite sand production line equipment of the present invention, preferably, each belt conveyor is provided with a sealing cover, and a dust removal system is connected to the sealing cover and the bucket elevator.

[0024] According to the pearlite sand production line complete set of the present invention, preferably, the rotary dryer comprises:

[0025] A rotating cylinder, wherein a base and rollers are arranged at the lower part of the rotating cylinder;

[0026] A rotary drive unit, which is arranged on the base and drives the rotary cylinder to move;

[0027] A first fixing ring is arranged on the outer wall of the rotating cylinder; and

[0028] The slap hammer is arranged on the first fixing ring. The slap hammer includes a first hammer body and a first hammer handle. The end of the first hammer handle is hinged to the first fixing ring through a hinge shaft. A hammer baffle is also arranged on one side of the first hammer handle.

[0029] According to the pearlite sand production line complete set of the present invention, preferably, the inner wall of the rotary cylinder is provided with a second fixing ring and a breaking hammer, and the breaking hammer includes a second hammer body, and the second hammer body is provided with alloy breaking teeth;

[0030] The second hammer body is connected to the second fixing ring via a chain; or the second hammer body is connected to the second fixing ring via a second hammer handle.

[0031] According to the pearlite sand production line complete set of the present invention, preferably, the first fixing ring and the second fixing ring are both coaxially arranged with the rotating cylinder, and a plurality of first fixing rings and second fixing rings are evenly distributed along the axis of the rotating cylinder; or

[0032] The first fixing ring and the second fixing ring are both spirally arranged on the rotating cylinder, and the first fixing ring and the second fixing ring each have at least two rows.

[0033] According to the complete set of perlite sand production line equipment of the present invention, preferably, a plurality of unloading plates are arranged on the inner wall of the rotating cylinder; and a chain is arranged between the unloading plate and the rotating cylinder.

[0034] The beneficial effects achieved by adopting the above technical solution are:

[0035] ① The present invention has a reasonable structural design, and has the advantages of good product particle shape, adjustable product particle size, and compact production line structure. It can ensure the orderly implementation of each process of the entire production line, improve the work efficiency of each process, and optimize the energy efficiency structure of the production line.

[0036] ② The present invention arranges the jaw crusher below the raw material bin, which improves the utilization rate of the space area on the one hand, and also saves the belt conveyor from the raw material bin to the jaw crusher on the other hand, making the feeding operation more convenient.

[0037] ② This application can match the process characteristics between each process through the setting of the first transfer silo, the second transfer silo, and the third transfer silo, which is convenient for unifying the work efficiency between each process. In addition, this application also divides sand making and screening into two systems, which is beneficial to the continuous and stable production operation of the entire production line and convenient for adjusting the work efficiency of the equipment according to the production volume.

[0038] ③ The rotary dryer of the present application adopts a slap hammer and a discharge plate in combination, and rationally utilizes the rotational inertia of the slap hammer and the gravitational potential energy of the discharge plate. The slap hammer rotates to the top of the rotary cylinder to slap the outer wall of the rotary cylinder, and the discharge plate rotates to the top of the rotary cylinder and falls freely, thereby effectively preventing the wall from forming when the sticky material is dried; the present application can also use the setting of a breaking hammer to cause turbulence in the internal directional material flow, and break up and block large agglomerated materials so that they can be exposed for a longer time, thereby improving the drying effect, improving the drying quality of the entire dryer, and being more conducive to subsequent crushing and screening.

[0039] ④ The sand making equipment of this application adopts a crushing mill, which adopts a central transmission, single-side feeding, and edge unloading working mode. The cylinder body adopts a double-layer modular structure design, the inner layer is a wear-resistant perforated liner, and the outer layer is a closed screen. During the operation of the whole machine, a closed grinding-screening self-circulating system is formed. Its advantages are less over-crushing, high yield, low energy consumption, adjustable product particle size, high reliability, and adjustable return amount.

[0040] ⑤ The screening equipment of the present application adopts a gyratory screen. Its unique planar gyratory motion mode allows the material to effectively adhere to the screen surface and rotate and slide along the rotation direction of the motor, which effectively extends the material's running path and greatly improves the screening efficiency. At the same time, unqualified mineral particles such as rods and flakes cannot pass through the screen, strictly controlling the product particle shape.

[0041] ⑥ The screening component of the present application can ensure the quality of screening through secondary action, and can refine the particle size. It can also process the return of materials with large particle size, realizing the automated continuous cycle production operation of the entire equipment and avoiding manual transportation of unqualified materials.

[0042] ⑦ The entire structure of the present application is in a relatively sealed state, so that the dust in each link of the entire production process can be isolated and collected, which greatly reduces the pollution to the workshop environment. The staff works in a dusty environment, which is more helpful to fundamentally block the spread of dust. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings of the embodiments of the present invention, wherein the drawings are only used to illustrate some embodiments of the present invention, but not to limit all embodiments of the present invention thereto.

[0044] Figure 1 It is a schematic diagram of the top structure of a perlite sand production line complete set according to an embodiment of the present invention.

[0045] Figure 2 for Figure 1 Schematic diagram of the AA structure in .

[0046] Figure 3 for Figure 1 Schematic diagram of the BB structure.

[0047] Figure 4 for Figure 1 Schematic diagram of the CC structure.

[0048] Figure 5 for Figure 1 Schematic diagram of the DD-direction structure.

[0049] Figure 6 Schematic diagram of the three-dimensional structure of a rotary dryer according to an embodiment of the present invention.

[0050] Figure 7 It is one of the side structural schematic diagrams of the rotary dryer according to an embodiment of the present invention.

[0051] Figure 8 This is the second schematic side view of the rotary dryer according to an embodiment of the present invention.

[0052] Serial number in the picture:

[0053] 110 is the raw material bin, 120 is the jaw crusher;

[0054] 200 is a rotary dryer, 201 is a rotary cylinder, 202 is a rotary drive unit, 203 is a base, 204 is a roller, 205 is a first fixed ring, 206 is a slap hammer, 2061 is a first hammer body, 2062 is a first hammer handle, 2063 is a hammer baffle, 207 is a second fixed ring, 208 is a scattering hammer, 2081 is a second hammer body, 2082 is an alloy scattering tooth, 209 is a chain, and 210 is a discharge plate;

[0055] 300 is a hammer crusher;

[0056] 400 is a crushing mill;

[0057] 510 is a primary gyratory screen, 520 is a secondary gyratory screen, and 530 is a screening frame;

[0058] 600 is the finished product warehouse;

[0059] 710 is the fifth belt conveyor, 720 is the sixth belt conveyor;

[0060] 801 is the first belt conveyor, 802 is the first bucket elevator, 803 is the first transfer silo, 804 is the first vibrating feeder, 805 is the second belt conveyor, 806 is the second bucket elevator, 807 is the second transfer silo, 808 is the second vibrating feeder, 809 is the third belt conveyor, 810 is the third bucket elevator, 811 is the third transfer silo, 812 is the fourth belt conveyor, and 813 is the fourth bucket elevator. DETAILED DESCRIPTION

[0061] The following will be combined with the accompanying drawings of specific embodiments of the present invention to clearly and completely describe the exemplary scheme of the embodiments of the present invention. Unless otherwise defined, the technical terms or scientific terms used in the present invention should be the common meanings understood by people with ordinary skills in the field.

[0062] In the description of the present invention, it should be understood that the expressions “first” and “second” are used to describe the various elements of the present invention and do not represent any limitation of order, quantity or importance, but are only used to distinguish one component from another.

[0063] It should be noted that when one element is “connected”, “coupled” or “connected” to another element, it may mean that they are directly connected, coupled or connected, but it should be understood that there may be intermediate elements between the two; that is, the positional relationships of direct connection and indirect connection are covered.

[0064] It should be noted that the use of "a" or "an" and similar words does not necessarily indicate a quantitative limitation. "Include" or "comprising" and similar words mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, but do not exclude other elements or objects.

[0065] It should be noted that terms such as "up", "down", "left" and "right" indicating orientation or positional relationship are only used to indicate relative positional relationship. This is for the convenience of describing the present invention and does not mean that the device or element must have a specific orientation, be constructed and operated in a specific orientation. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0066] See also Figure 1-Figure 8 The present application discloses a complete set of pearlite sand production line equipment, including a raw material bin 110, a jaw crusher 120, a rotary dryer 200, a hammer crusher 300, a crushing mill, a screening assembly, a finished product bin 600 and a return assembly arranged in sequence, the raw material bin 110 is arranged on the upper part of the jaw crusher 120, the discharge port of the raw material bin 110 is correspondingly connected to the feed port of the jaw crusher 120, the raw material bin 110 is used to hold ore and directly feed the jaw crusher; a first conveying unit is arranged between the discharge port of the jaw crusher 120 and the feed port of the rotary dryer 200; the first conveying unit includes a raw material bin 110 and a raw material bin 600 arranged in sequence. The first belt conveyor 801, the first bucket elevator 802 and the first transfer bin 803 are arranged, and the first vibrating feeder 804 is arranged between the discharge port of the first transfer bin 803 and the rotary dryer 200; during the operation, the first belt conveyor 801 is used to feed the ore coarsely crushed by the jaw crusher into the first bucket elevator; the first bucket elevator 802 is located on the right side of the first belt conveyor 801, and is used to feed the ore into the first transfer bin 803; the first electric vibrating feeder 804 is located below the first transfer bin 803, and is used to feed the ore in the first transfer bin 803 into the rotary dryer 200.

[0067] A second conveying unit is arranged between the discharge port of the rotary dryer and the feed port of the hammer crusher; the second conveying unit is a second belt conveyor, and the second belt conveyor 805 is inclined. The inclination angle in this embodiment is 26°. The second belt conveyor 805 is used to feed the dried ore into the hammer crusher 300; the hammer crusher performs secondary crushing on the ore.

[0068] A third conveying unit is provided between the discharge port of the hammer crusher 300 and the feed port of the crushing mill. In this embodiment, there are at least two groups of crushing mills 400, and two groups are used as an example for explanation. The third conveying unit includes a second bucket elevator 806 and a second transfer bin 807. A second vibrating feeder 808 is provided between the second transfer bin 807 and each crushing mill 400. Specifically, the ore crushed in the hammer crusher 300 is lifted to the second transfer bin 807 by the second bucket elevator 806, and two second vibrating feeders 808 are provided at the bottom of the second transfer bin, so as to respectively convey the ore to the corresponding crushing mills for sand making.

[0069] A fourth conveying unit is arranged between the discharge port of the crushing mill 400 and the feed port of the screening assembly. The fourth conveying unit includes a third belt conveyor 809, a third bucket elevator 810 and a third transfer bin 811. The discharge port of each crushing mill corresponds to the third belt conveyor 809. According to different arrangements, a transfer conveyor can be additionally provided to facilitate the connection between the third belt conveyor and the discharge port of the crushing mill, so as to collect and convey the material after sand making, and lift it into the third transfer bin 811 through the third bucket elevator 810.

[0070] The screening assembly in this embodiment includes a screening frame 530, a primary screening unit arranged on the upper part of the screening frame 530, and a secondary screening unit arranged in the middle part of the screening frame. The finished product bin is arranged at the lower part of the screening frame 530. The primary screening unit includes at least two groups of primary gyratory screens 510 arranged side by side. A fourth belt conveyor 812 and a fourth bucket elevator 813 are arranged between the third transfer bin 811 and each primary gyratory screen 510.

[0071] The secondary screening unit includes at least one group of secondary gyratory screens 520, some screening material outlets of the primary gyratory screen 510 are correspondingly connected to the feed port of the secondary gyratory screen 520, and other screening material outlets of the primary gyratory screen 510 and each material outlet of the secondary gyratory screen 520 are connected to the corresponding finished product bin 600.

[0072] Specifically, there are four first-level gyratory screens 510 and two second-level gyratory screens 520 in the present application. Two discharge ports are arranged at the lower part of the third transfer silo 811. Each discharge port corresponds to a group of fourth belt conveyor 812 and fourth bucket elevator 813. The discharge port at the top of the fourth bucket elevator is connected to the feed port of the first-level gyratory screen. Since one fourth bucket elevator 813 needs to correspond to two first-level gyratory screens, a herringbone powder feeder can be arranged at the discharge port of the fourth bucket elevator for material separation.

[0073] The first-level gyratory screens 510 are grouped in pairs. A collecting hopper is set at the lower part of the outlet of the finest particle size of the first-level gyratory screen, and corresponds to the feed port of one of the second-level gyratory screens 520 for secondary screening. After screening by the second-level gyratory screen 520, grading is achieved and enters the corresponding finished product bin 600. The outlets of the screening materials of other particle sizes of the first-level gyratory screen are also connected to the corresponding finished product bin 600.

[0074] The return material component includes a fifth belt conveyor 710 and a sixth belt conveyor 720. The fifth belt conveyor 710 is correspondingly arranged at the lower part of the material outlet on the first-stage gyratory screen 510. The first end of the sixth belt conveyor 720 is correspondingly arranged at the blanking end of the fifth belt conveyor 710. The second end of the sixth belt conveyor 720 is connected to the feed end of the crusher 400 or the third conveying unit. As shown in the figure, the second end of the sixth belt conveyor 720 of this embodiment is connected to the second transfer silo 807.

[0075] Furthermore, each belt conveyor in the present application is provided with a sealing cover, and a dust removal system is connected to the sealing cover and each bucket elevator.

[0076] Furthermore, since the drying effect of the dryer on the material affects the processing quality of the subsequent entire production process, it is necessary to optimize the structure of the dryer. The rotary dryer in this embodiment includes a rotating cylinder 201, a rotary drive unit 202, a first fixed ring 205 and a slap hammer 206, and a base 203 and a roller 204 are arranged at the lower part of the rotating cylinder 201; the rotary drive unit 202 is arranged on the base 203, and drives the rotating cylinder 201 to move; the first fixed ring 205 is arranged on the outer wall of the rotating cylinder 201; the slap hammer 206 is arranged on the first fixed ring 205, and the slap hammer 206 includes a first hammer body 2061 and a first hammer handle 2062, and the end of the first hammer handle 2062 is hinged to the first fixed ring 205 through a hinge shaft, and a hammer baffle 2063 is also arranged on one side of the first hammer handle 2062.

[0077] A second fixing ring 207 and a breaking hammer 208 are provided on the inner wall of the rotary cylinder 201 . The breaking hammer 208 includes a second hammer body 2081 , and alloy breaking teeth 2082 are provided on the second hammer body 2081 .

[0078] Regarding the fixing method of the second hammer body, this embodiment provides two structures, wherein the first structure is that the second hammer body 2081 is connected to the second fixing ring 207 via a chain 209; the second structure is that the second hammer body 2081 is connected to the second fixing ring 207 via a second hammer handle.

[0079] As for the arrangement of the slap hammer and the breaking hammer, this embodiment provides two structural forms. Form 1: the first fixing ring 205 and the second fixing ring 207 are both coaxially arranged with the rotating cylinder 201, and a plurality of first fixing rings 205 and second fixing rings 207 are evenly distributed along the axis of the rotating cylinder; Form 2: the first fixing ring 205 and the second fixing ring 207 are both spirally arranged on the rotating cylinder 201, and the first fixing ring 205 and the second fixing ring 207 are at least two. Figure 8 As shown, the figure shows a schematic structural diagram of a spirally arranged breaking hammer.

[0080] In addition to setting a breaking hammer on the inner wall of the rotating cylinder, multiple unloading plates 210 can also be set on the inner wall of the rotating cylinder 201; a chain 209 is set between the unloading plate 210 and the rotating cylinder 201. The above method can also prevent material lumps on the dryer and improve the drying efficiency.

[0081] The working process of the above-mentioned perlite sand production line complete set of equipment is as follows:

[0082] The customer uses a forklift to deliver the ore into the raw material bin. After the ore is roughly crushed to less than 60mm by the jaw crusher, it is fed into the first transfer bin through the first belt conveyor and the first bucket elevator. The first vibrating feeder at the bottom of the first transfer bin feeds the ore and enters the rotary dryer for drying. The dried ore enters the hammer crusher through the second belt conveyor and is crushed to less than 30mm. The ore is fed into the second transfer bin through the second bucket elevator. Two second vibrating feeders are installed at the bottom of the second transfer bin, which feed two crushing mills for sand making. The ore is crushed to less than 2mm and fed into the third transfer bin through the third belt conveyor. The bottom part of the third transfer bin There are two fourth belt conveyors, and the ore is fed into two fourth bucket elevators respectively. The ore is fed into four primary gyratory screens for screening through two herringbone ore dividing buckets, and is divided into five particle sizes: above 20 mesh, 20-30 mesh, 30-50 mesh, 50-70 mesh, and below 70 mesh. Among them, the ore above 20 mesh is returned to sand making through the belt conveyor, and the three products of 20-30 mesh, 30-50 mesh, and 50-70 mesh are respectively sent to their respective finished product warehouses. The ore below 70 mesh enters two secondary gyratory screens for secondary screening, and is divided into three products of 70-90 mesh, 90-120 mesh, and below 120 mesh, which are respectively sent to their respective finished product warehouses.

[0083] The term "and / or" in this article indicates that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the objects before and after are in an "or" relationship.

[0084] The preferred embodiments for implementing the present invention have been described in detail above, but it should be understood that the role of these embodiments is only to exemplify, and is not intended to limit the scope, applicability or configuration of the present invention in any way. The protection scope of the present invention is defined by the attached claims and their equivalents. A person of ordinary skill in the art can make many changes to the above embodiments under the guidance of the present invention, and these changes all fall within the protection scope of the present invention.

Claims

1. A complete set of perlite sand production line, characterized in that: include: Raw material warehouse; A first crusher, wherein the discharge port of the raw material bin is correspondingly connected to the feed port of the first crusher; A rotary dryer, wherein a first conveying unit is provided between the discharge port of the first crusher and the feed port of the rotary dryer; a second crusher, wherein a second conveying unit is provided between the discharge port of the rotary dryer and the feed port of the second crusher; A crushing mill, wherein a third conveying unit is provided between the discharge port of the second crushing mill and the feed port of the crushing mill; A screening assembly, wherein a fourth conveying unit is provided between the discharge port of the grinding mill and the feed port of the screening assembly; A finished product bin connected to the finished product discharge port of the screening assembly; as well as A material return component, wherein the feed end of the material return component is connected to the screen material outlet of the screening component, and the discharge end of the material return component is connected to the feed end of the crushing mill or the third conveying unit; The first crusher is a jaw crusher, and the raw material bin is arranged on the upper part of the jaw crusher; the second crusher is a hammer crusher; The first conveying unit comprises a first belt conveyor, a first bucket elevator and a first transfer silo which are arranged in sequence, and a first vibrating feeder is arranged between the discharge port of the first transfer silo and the rotary dryer; The second conveying unit is a second belt conveyor, and the second belt conveyor is arranged obliquely; The third conveying unit includes a second bucket elevator and a second transfer bin, the crushing mills are at least two groups, and a second vibrating feeder is provided between the second transfer bin and each of the crushing mills; The fourth conveying unit includes a third belt conveyor, a third bucket elevator and a third transfer silo; The screening assembly comprises a screening frame, a primary screening unit arranged at the upper part of the screening frame, and a secondary screening unit arranged at the middle part of the screening frame, the finished product bin is arranged at the lower part of the screening frame, the primary screening unit comprises at least two groups of primary gyratory screens arranged side by side, and a fourth belt conveyor and a fourth bucket elevator are arranged between the third transfer bin and each of the primary gyratory screens; The secondary screening unit comprises at least one set of secondary gyratory screens, part of the screening material outlets of the primary gyratory screen are correspondingly connected to the feed port of the secondary gyratory screen, and the other screening material outlets of the primary gyratory screen and each material outlet of the secondary gyratory screen are connected to the corresponding finished product bin; The return material assembly includes a fifth belt conveyor and a sixth belt conveyor, the fifth belt conveyor is correspondingly arranged at the lower part of the material outlet on the first-level gyratory screen, the first end of the sixth belt conveyor is correspondingly arranged at the blanking end of the fifth belt conveyor, and the second end of the sixth belt conveyor is correspondingly arranged at the feeding end of the crushing mill or the third conveying unit; The rotary drying machine comprises: A rotating cylinder, wherein a base and rollers are arranged at the lower part of the rotating cylinder; A rotary drive unit, which is arranged on the base and drives the rotary cylinder to move; A first fixing ring is arranged on the outer wall of the rotating cylinder; and A slap hammer, which is arranged on the first fixing ring, and comprises a first hammer body and a first hammer handle, wherein the end of the first hammer handle is hinged to the first fixing ring through a hinge shaft, and a hammer baffle is also arranged on one side of the first hammer handle; The inner wall of the rotary cylinder is provided with a second fixing ring and a breaking hammer, wherein the breaking hammer comprises a second hammer body, and the second hammer body is provided with alloy breaking teeth; The second hammer body is connected to the second fixing ring via a chain; or the second hammer body is connected to the second fixing ring via a second hammer handle; The first fixing ring and the second fixing ring are both coaxially arranged with the rotating cylinder, and a plurality of first fixing rings and second fixing rings are evenly distributed along the axis of the rotating cylinder; or The first fixing ring and the second fixing ring are both spirally arranged on the rotating cylinder, and the first fixing ring and the second fixing ring each have at least two rows; A plurality of unloading plates are arranged on the inner wall of the rotary cylinder; a chain is arranged between the unloading plates and the rotary cylinder.

2. The pearlite sand production line complete set of equipment according to claim 1 is characterized in that: Each belt conveyor is provided with a sealing cover, and a dust removal system is connected to the sealing cover and the bucket elevator.

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