A double-stage linkage vibrating screen device for building screening

Abstract

The present invention relates to the technical field of construction equipment, and specifically to a double-stage linkage vibrating screen device for construction screening, comprising a support frame, a first screening grid frame and a second screening grid frame are installed on the support frame through a buffer spring suspension, the first screening grid frame and the second screening grid frame are both inclined, the second screening grid frame is installed below the first screening grid frame, and the first screening grid frame and the second screening grid frame are respectively provided with a coarse screen and a fine screen; a crushing cylinder for crushing the screened materials is horizontally arranged at the discharge port of the first screening grid frame, and the discharge port of the first screening grid frame is rotatably connected to the crushing cylinder, wherein a crushing shaft is arranged inside the crushing cylinder, and a plurality of fan-shaped crushing wheels are installed on the crushing shaft. The present invention can prevent normal-sized sand particles from being crushed into finer powder, and can prevent the compressive strength of sand and gravel from being reduced when mixed with cement into concrete.

Description

Technical Field

[0001] The invention relates to the technical field of construction equipment, and in particular to a double-stage linkage vibrating screen device for construction screening. Background Art

[0002] In the process of construction, a large amount of building materials such as sand and gravel are needed. Before using the sand and gravel, they need to be screened to remove the large particles and ensure the uniformity of the materials. Usually, a vibrating screen is used.

[0003] The Chinese invention patent with application number CN201710487879.0 disclosed "a double-stage linkage vibrating screen device for building screening" on September 15, 2017, including a frame, a two-stage driving mechanism, a screening cylinder and a crushing cylinder. A crossbeam frame is welded on the top of the frame, and a feeding bucket is welded on the crossbeam frame. The outside of the crushing cylinder is welded to the frame through a bearing sleeve; a gear ring is welded on the outer wall of the crushing cylinder, and the side of the gear ring is meshed and connected to the driving gear, and the driving gear is welded to the rotating shaft of the motor C, and the motor C is installed on the frame; crushing teeth are welded on the inner wall of the crushing cylinder, and a crushing hammer is installed on the inner side of the crushing teeth; the crushing hammer and the crushing teeth crush the building materials, and the grinding disc further grinds and crushes the crushed materials. Under the drive of the two-stage driving mechanism, the first-level screen and the second-level screen are linked to perform two-stage vibration screening on the building materials, thereby improving the efficiency and efficiency of building material screening, reducing the installation cost of the screening drive, and improving the quality of building material screening;

[0004] Although the prior art similar to the above application can crush large-grained sand particles, since the above equipment crushes all the sand and gravel, this method will not only increase the operating burden of the crushing equipment, but also cause normal sand particles to be squeezed and crushed, and the overall stone powder rate of the sand will be too high. If the stone powder rate is too high, it will directly affect the quality of the sand and gravel (the softness and saturation of stone powder particles are not as good as gravel. Once they absorb water, they will expand, which may lead to a decrease in the compressive strength of sand and gravel). Summary of the invention

[0005] Technical issues solved

[0006] In view of the above shortcomings of the prior art, the present invention provides a double-stage linkage vibrating screen device for construction screening, which can effectively solve the problem that the method of crushing the sand as a whole before screening in the prior art not only increases the operating burden of the crushing equipment, but also causes the normal sand particles to be squeezed and crushed, which will make the overall stone powder rate of the sand too high. If the stone powder rate is too high, it will directly affect the quality of the sand and gravel. The softness and saturation of the stone powder particles are not as good as those of gravel. Once they absorb water, they will expand, which may lead to a decrease in the compressive strength of the sand and gravel.

[0007] Technical Solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0009] The present invention provides a double-stage linkage vibrating screen device for building screening, comprising a support frame, a first screening grid frame and a second screening grid frame are installed on the support frame through a buffer spring suspension, the first screening grid frame and the second screening grid frame are both inclined, the second screening grid frame is installed below the first screening grid frame, and the first screening grid frame and the second screening grid frame are respectively provided with a coarse screen and a fine screen;

[0010] A crushing drum for crushing the screened materials is horizontally arranged at the discharge port of the first screening grid frame, the discharge port of the first screening grid frame is rotatably connected to the crushing drum, a fixing frame is fixedly installed on the support frame, and the fixing frame is supported and installed at both ends of the crushing drum;

[0011] A crushing shaft is coaxially arranged inside the crushing barrel, and a plurality of sets of fan-shaped crushing wheels are installed on the crushing shaft at intervals. A baffle plate is arranged inside the crushing barrel, and a plurality of sets of crushing grooves for the fan-shaped crushing wheels to rotate through are arranged on the baffle plate.

[0012] Furthermore, the upper end of the second screening frame is rotatably connected to the lower two sides of the first screening frame, the lower two sides of the second screening frame are connected to the support frame through buffer springs, and the second screening frame extends to the bottom of the crushing cylinder, and a plurality of material discharge holes are arranged below the crushing cylinder.

[0013] Furthermore, one end of the baffle plate is fixedly installed on one side of the crushing cylinder close to the first screening grid, and the other end of the baffle plate is provided with a supporting through hole mounted on the crushing shaft. The end of the baffle plate away from the inner wall of the crushing cylinder is inclined upward, and the crushing cylinder is provided with a pushing mechanism for pushing the baffle plate toward the lower material through hole.

[0014] Furthermore, the pushing mechanism includes a pushing plate, both ends of which are fixedly installed with limit shafts, a sliding rod is provided on the end surface of the pushing plate facing the inner wall of the crushing barrel, the other end of the sliding rod passes through the crushing barrel, an elastic member is sleeved on the outer side of the sliding rod, one end of the elastic member is connected to the outer wall of the crushing barrel, and the elastic member is used to drive the sliding rod to move toward the pushing plate; a driving disk is provided inside the crushing barrel for intermittently limiting the moving position of the pushing plate.

[0015] Furthermore, the driving disc is fixedly arranged at both ends of the crushing shaft, and the driving disc is provided with a driving groove for the limiting shaft to extend into.

[0016] Furthermore, a driving motor is fixedly mounted on the fixing frame, a driving pulley is provided on the crushing shaft, and the driving motor drives the crushing shaft to rotate by driving the driving pulley to rotate.

[0017] Furthermore, a linkage pulley is coaxially fixedly mounted on the crushing shaft, a vibration assembly is arranged below the linkage pulley, and the linkage pulley drives the vibration assembly to rotate through a transmission belt.

[0018] Furthermore, the vibration component includes a rotating pulley, which is driven by a linkage pulley to rotate through a transmission belt. One side of the rotating pulley is rotatably connected to the support frame, and an eccentric shaft is eccentrically arranged on the other side of the rotating pulley. A connecting block is arranged on the side of the second screening frame, and a strip guide hole is arranged on the connecting block for the eccentric shaft to extend into.

[0019] Furthermore, right-angle plates are fixedly installed on both sides of the first screening frame, and rotation mounting holes are provided on the right-angle plates. A rotation connecting shaft is fixedly installed on the upper end of the second screening frame. When the second screening frame is installed under the first screening frame, both ends of the rotation connecting shaft respectively pass through the rotation mounting holes on the two right-angle plates.

[0020] Furthermore, each group of the fan-shaped crushing wheels includes a plurality of fan-shaped crushing wheels distributed in a ring shape, and during the rotation process, the plurality of fan-shaped crushing wheels pass through the crushing grooves in sequence.

[0021] Beneficial Effects

[0022] Compared with the known public technology, the technical solution provided by the present invention has the following beneficial effects:

[0023] The present invention arranges the crushing drum at the discharge port of the first screening grid frame, so that the large-grained gravel screened by the coarse screen on the first screening grid frame can be smoothly introduced into the crushing drum for crushing, and the screened large-grained gravel can be directly crushed, so that the crushing process of the large-grained gravel can be completed more efficiently, and the workload of the crushing device can be reduced. At the same time, it can also prevent normal-sized sand particles from being crushed into finer powder, and can prevent the compressive strength of sand and gravel from being reduced when mixed with cement to form concrete.

[0024] The present invention arranges a baffle plate inside the crushing cylinder and tilts one end of the baffle plate upward. When large-grained sand or agglomerated sand falls on the baffle plate, the large-grained sand or agglomerated sand will slide toward the baffle plate close to the inner wall of the crushing cylinder under the guidance of the baffle plate. The torque exerted by the fan-shaped crushing wheel on the large-grained sand or agglomerated sand is greater, so the large-grained sand or agglomerated sand can be crushed more forcefully.

[0025] In the present invention, the driving disc intermittently limits the position of the pushing plate, so that the pushing plate continuously pushes the large-grained gravel to the top of the crushing groove, and the fan-shaped crushing wheel crushes the large-grained gravel more timely, thereby completing the crushing of the large-grained gravel more efficiently. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 It is a schematic diagram of the overall structure of another perspective of the present invention;

[0029] Figure 3 It is a schematic diagram of the overall structure of the present invention without the fixing frame;

[0030] Figure 4 is a side view of the present invention;

[0031] Figure 5 The exploded view of the present invention without the support frame and the fixing frame;

[0032] Figure 6 An exploded view of the internal structure of the crushing tube of the present invention;

[0033] Figure 7 It is a schematic diagram of the internal structure of the crushing tube of the present invention;

[0034] Figure 8 A side view of the internal structure of the crushing tube of the present invention;

[0035] Fig. 9 It is a schematic diagram of the overall structure of the drive disk of the present invention;

[0036] Fig.10 It is a schematic diagram of the overall structure of the pushing mechanism of the present invention.

[0037] The numbers in the figure represent: 1. first screening grid; 11. coarse screen; 12. right-angle plate; 2. second screening grid; 21. rotating connecting shaft; 22. fine screen; 23. connecting block; 2301. strip guide hole; 3. crushing cylinder; 301. feeding hole; 302. rotating connecting hole; 31. crushing shaft; 32. fan-shaped crushing wheel; 33. baffle plate; 3301. crushing groove; 3302. supporting hole; 34. driving disk; 3401. driving groove; 35. fixed disk; 36. pushing mechanism; 361. pushing plate; 362. limiting shaft; 363. sliding rod; 364. elastic member; 37. dividing rod; 4. supporting frame; 5. guide plate; 6. fixed frame; 61. driving motor; 62. driving pulley; 63. vibration component; 631. rotating pulley; 632. eccentric shaft; 64. linkage pulley. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] The present invention will be further described below in conjunction with the embodiments.

[0040] Embodiment: A double-stage linkage vibrating screen device for building screening, such as Figure 1-Figure 5 As shown, it includes a support frame 4, a first screening frame 1 and a second screening frame 2 are installed on the support frame 4 through a buffer spring suspension, the first screening frame 1 and the second screening frame 2 are both inclined, the second screening frame 2 is installed below the first screening frame 1, and the first screening frame 1 and the second screening frame 2 are respectively provided with a coarse screen 11 and a fine screen 22;

[0041] A crushing drum 3 for crushing the screened materials is horizontally arranged at the discharge port of the first screening grid frame 1, and the discharge port of the first screening grid frame 1 is rotatably connected to the crushing drum 3. A fixing frame 6 is fixedly installed on the support frame 4, and the fixing frame 6 is supported and installed at both ends of the crushing drum 3.

[0042] A crushing shaft 31 is coaxially arranged inside the crushing barrel 3, and a plurality of sets of fan-shaped crushing wheels 32 are installed on the crushing shaft 31 at intervals. A baffle plate 33 is arranged inside the crushing barrel 3, and a plurality of sets of crushing grooves 3301 are arranged on the baffle plate 33 for the fan-shaped crushing wheels 32 to rotate through.

[0043] In the present invention, by arranging the crushing drum 3 at the discharge port of the first screening grid frame 1, the large-grained gravel screened by the coarse screen 11 on the first screening grid frame 1 can be smoothly introduced into the crushing drum 3 for crushing, and the large-grained gravel screened can be directly crushed, so that the crushing process of the large-grained gravel can be completed more efficiently, and the workload of the crushing device can be reduced. At the same time, it can also prevent normal-sized sand particles from being crushed into finer powders, and can prevent the compressive strength of sand and gravel from being reduced when mixed with cement to form concrete.

[0044] Furthermore, the upper end of the second screening grid 2 is rotatably connected to the lower two sides of the first screening grid 1, and the lower two sides of the second screening grid 2 are connected to the support frame 4 through buffer springs. The second screening grid 2 extends to the bottom of the crushing cylinder 3, and a plurality of material discharge holes 301 are provided below the crushing cylinder 3.

[0045] Among them, by directly and horizontally setting the crushing drum 3 at the discharge port of the first screening grid frame 1, the large particles of sand that are continuously moving downward can fall into the inside of the crushing drum 3, and a rotating connection hole 302 that can be rotatably connected to the first screening grid frame 1 is provided on the crushing drum 3, which can ensure that the large particles of sand that have been screened can fall smoothly into the crushing drum 3 without affecting the vibration of the first screening grid frame 1; a discharge hole 301 is provided below the crushing drum 3, so that the large particles of sand after crushing can fall from the discharge hole 301 to the second screening grid frame 2, and can be screened and classified again, so that the crushed large particles of sand can be uniformly classified, and the stone powder rate of the sand can be conveniently controlled.

[0046] Furthermore, if Figure 8 As shown, one end of the baffle plate 33 is fixedly installed on one side of the crushing cylinder 3 close to the first screening grid 1, and the other end of the baffle plate 33 is provided with a supporting through hole 3302 mounted on the crushing shaft 31. The end of the baffle plate 33 away from the inner wall of the crushing cylinder 3 is tilted upward, and the crushing cylinder 3 is provided with a pushing mechanism 36 for pushing the baffle plate 33 to the lower material through hole 301.

[0047] By arranging a baffle plate 33 inside the crushing cylinder 3 and tilting one end of the baffle plate 33 upward, when large sand particles or agglomerated sand fall on the baffle plate 33, under the guidance of the baffle plate 33, the large sand particles or agglomerated sand will slide toward the baffle plate 33 close to the inner wall of the crushing cylinder 3. When the multiple sets of fan-shaped crushing wheels 32 rotate to the baffle plate 33, the large sand particles or agglomerated sand will contact the fan-shaped crushing wheels 32 at a position away from the crushing shaft 31. The fan-shaped crushing wheels 32 act on The torque on large-grained gravel or agglomerated sand is greater (the torque calculation formula is M=F·L, where F is the magnitude of the force and L is the lever arm, that is, the distance from the rotation axis to the point of application. The torque is a physical quantity that describes the rotation effect of an object and is determined by two parameters, force and lever arm). Large-grained gravel or agglomerated sand can be crushed more effectively. In addition, the staggered side view between the upper end face of the inclined baffle plate 33 and the crushing surface of the fan-shaped crushing wheel 32 is scissor-shaped, which can save effort and efficiently complete the crushing of large-grained gravel or agglomerated sand.

[0048] Furthermore, if Fig.10 As shown, the pushing mechanism 36 includes a pushing plate 361, both ends of which are fixedly installed with limiting shafts 362, and the end surface of the pushing plate 361 facing the inner wall of the crushing cylinder 3 is provided with a sliding rod 363, the other end of the sliding rod 363 passes through the crushing cylinder 3, and the outer side of the sliding rod 363 is sleeved with an elastic member 364, one end of the elastic member 364 is connected to the outer wall of the crushing cylinder 3, and the elastic member 364 is used to drive the sliding rod 363 to move toward the pushing plate 361; the interior of the crushing cylinder 3 is provided with a driving disk 34 for intermittently limiting the moving position of the pushing plate 361.

[0049] Among them, the side view projection shape of the pushing plate 361 is L-shaped, and the lower end of the pushing plate 361 is against the upper end surface of the baffle plate 33. The inclination angle of the sliding rod 363 is the same as the inclination angle of the baffle plate 33, so that the bottom of the pushing plate 361 can always be against the baffle plate 33 during the sliding process. By setting the pushing plate 361, the large particles of gravel accumulated at the lowest point of the baffle plate 33 can be continuously pushed to the top of the crushing groove 3301, and the large particles of gravel can be evenly spread above the crushing groove 3301 (by continuously releasing the pushing plate 361, the pushing plate 361 will instantly accelerate after being released, and the accumulated large particles of gravel will be pushed to the top of the baffle plate 33, so that the large particles of gravel can be spread), so that the accumulation of large particles of gravel can be avoided, and the large particles of gravel can be crushed more evenly, so that the crushing process occurs at various positions above the crushing groove 3301.

[0050] Among them, the driving disk 34 intermittently limits the position of the pushing plate 361, so that the pushing plate 361 continuously pushes the large-grained gravel into the crushing groove 3301, allowing the fan-shaped crushing wheel 32 to crush the large-grained gravel more timely and complete the crushing process of large-grained gravel more efficiently.

[0051] Furthermore, the driving disk 34 is fixedly arranged at both ends of the crushing shaft 31, and the driving disk 34 is provided with a driving groove 3401 for the limiting shaft 362 to extend into; a fixed disk 35 coaxial with the driving disk 34 is arranged inside the crushing cylinder 3, and the fixed disk 35 is fixedly installed inside the crushing cylinder 3, and the fixed disk 35 is used to prevent sand and gravel from entering the driving groove 3401.

[0052] The driving groove 3401 is composed of an annular groove and a right-angle groove, and the right-angle grooves are distributed in an annular manner at equal intervals on the inner side of the annular groove, and the annular groove and the right-angle groove are interconnected; when the crushing shaft 31 rotates, the fixed plate 35 and the fan-shaped crushing wheel 32 are driven to rotate synchronously. When the right-angle groove is aligned with the limit shaft 362, the push plate 361 is pushed by the elastic member 364 to push the large-grained gravel upward along the baffle plate 33. As the crushing shaft 31 continues to rotate, the fan-shaped crushing wheel 32 rotates to the crushing groove 3301 to crush the large-grained gravel just pushed in (the installation angles of the fixed plate 35 and the fan-shaped crushing wheel 32 are as shown in FIG. 1 ). Figure 7 As shown in FIG, the fan-shaped crushing wheel 32 follows the right-angle groove immediately when rotating).

[0053] Furthermore, if Figure 2 , Figure 3 As shown, a driving motor 61 is fixedly mounted on the fixing frame 6 , and a driving pulley 62 is provided on the crushing shaft 31 . The driving motor 61 drives the crushing shaft 31 to rotate by driving the driving pulley 62 to rotate.

[0054] Furthermore, a linkage pulley 64 is coaxially fixedly mounted on the crushing shaft 31 , a vibration assembly 63 is disposed below the linkage pulley 64 , and the linkage pulley 64 drives the vibration assembly 63 to rotate via a transmission belt.

[0055] Among them, linkage pulleys 64 are arranged on both sides of the crushing shaft 31, and the linkage pulleys 64 are used to provide power for the vibration component 63, which can reduce the power source on the equipment, reduce the electrical parts of the equipment, and reduce the failure rate of the equipment.

[0056] Furthermore, if Figure 5As shown, the vibration component 63 includes a rotating pulley 631, and the interlocking pulley 64 drives the rotating pulley 631 to rotate through a transmission belt. One side of the rotating pulley 631 is rotatably connected to the support frame 4, and the other side of the rotating pulley 631 is eccentrically provided with an eccentric shaft 632. A connecting block 23 is provided on the side of the second screening frame 2, and a strip guide hole 2301 for the eccentric shaft 632 to extend into is provided on the connecting block 23; the strip guide hole 2301 is horizontally arranged, and the distance between the upper wall and the lower wall of the strip guide hole 2301 is equal to the diameter length of the eccentric shaft 632.

[0057] Among them, the rotating pulley 631 rotates under the drive of the linkage pulley 64. The diameter of the rotating pulley 631 is smaller than the diameter of the linkage pulley 64. When the linkage pulley 64 rotates, it can drive the rotating pulley 631 to rotate more circles, so that the eccentric shaft 632 can drive the connecting block 23 to move up and down more times, which can increase the up and down movement frequency of the second screening frame 2.

[0058] Furthermore, if Figure 5 As shown, right-angle plates 12 are fixedly installed on both sides of the first screening grid 1, and rotation mounting holes are provided on the right-angle plates 12. A rotation connecting shaft 21 is fixedly installed on the upper end of the second screening grid 2. When the second screening grid 2 is installed under the first screening grid 1, the two ends of the rotation connecting shaft 21 pass through the rotation mounting holes on the two right-angle plates 12 respectively.

[0059] Among them, the upper end of the second screening grid frame 2 is rotatably installed under the first screening grid frame 1, which can not only receive the sand particles falling from the coarse screen 11, but also conveniently perform secondary screening on the fallen sand particles. At the same time, when the second screening grid frame 2 vibrates up and down, it will drive the first screening grid frame 1 to vibrate (the main part of the first screening grid frame 1 is suspended on the support frame 4, and the first screening grid frame 1 is mainly supported by a buffer spring. When the second screening grid frame 2 under the first screening grid frame 1 vibrates up and down, it can smoothly drive the first screening grid frame 1 to vibrate). The first screening grid frame 1 is installed with the coarse screen 11, so the first screening grid frame 1 does not need to vibrate violently, and the sand particles that meet the specifications can be screened out. Only the agglomerated sand particles and a small number of large-grained sand particles are left on the coarse screen 11 and introduced into the interior of the crushing cylinder 3.

[0060] Furthermore, if Figure 8 As shown, each group of the fan-shaped crushing wheels 32 includes a plurality of fan-shaped crushing wheels 32 distributed in a ring shape. During the rotation process, the plurality of fan-shaped crushing wheels 32 pass through the crushing grooves 3301 in sequence.

[0061] Among them, since an upwardly protruding dividing rod 37 is provided at the bottom of the crushing cylinder 3, the dividing rod 37 divides the multiple feeding holes 301 into multiple grids, and the sand particles that cannot pass through the grids will be retained inside the crushing cylinder 3. As the fan-shaped crushing wheel 32 inside the crushing cylinder 3 rotates, these sand particles will be stirred and crushed improperly until the sand particles can pass through the grids and fall on the second screening grid frame 2, so that the quality of crushing can be strictly controlled to avoid incomplete crushing.

[0062] Furthermore, it also includes a material guide plate 5 , which is fixedly installed inside the support frame 4 , and is used to receive the material screened from the fine screen 22 .

[0063] By arranging a guide plate 5 under the second screening grid 2 to guide the sand particles screened from the fine screen 22, the overly fine sand particles can be conveniently collected, and the fine sand particles can be separated from the sand particles that meet the specifications and discharged. The screened sand particles can better meet the standards of construction, and more standard sand particles can be used during the construction of the building, thereby improving the compressive strength of the building.

[0064] Working principle:

[0065] When screening the sand, first pour the sand into the side of the upper end of the first screening frame 1 away from the crushing drum 3. During the vibration of the first screening frame 1, the sand slides downward along the first screening frame 1. During the sliding process, the sand particles that meet the specifications pass through the coarse screen 11 and fall onto the second screening frame 2. The agglomerated sand and oversized sand particles are left on the coarse screen 11 and are directly introduced into the crushing drum 3 for crushing. After the crushing is completed, the sand particles fall from the bottom of the crushing drum 3 to the second screening frame 2 for further screening and separation.

[0066] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A double-stage linkage vibrating screen device for building screening, characterized in that: The invention comprises a support frame (4), a first screening frame (1) and a second screening frame (2) are installed on the support frame (4) by means of a buffer spring suspension, the first screening frame (1) and the second screening frame (2) are both arranged at an angle, the second screening frame (2) is installed below the first screening frame (1), and the first screening frame (1) and the second screening frame (2) are respectively provided with a coarse screen (11) and a fine screen (22); A crushing drum (3) for crushing the screened material is horizontally arranged at the discharge port of the first screening grid frame (1), the discharge port of the first screening grid frame (1) is rotatably connected to the crushing drum (3), a fixing frame (6) is fixedly mounted on the support frame (4), and the fixing frame (6) is supported and mounted at both ends of the crushing drum (3); A crushing shaft (31) is coaxially arranged inside the crushing barrel (3), a plurality of groups of fan-shaped crushing wheels (32) are installed on the crushing shaft (31) at intervals, a material blocking plate (33) is arranged inside the crushing barrel (3), and a plurality of groups of crushing grooves (3301) are arranged on the material blocking plate (33) for the fan-shaped crushing wheels (32) to rotate and pass through; The upper end of the second screening grid frame (2) is rotatably connected to the lower two sides of the first screening grid frame (1); the lower two sides of the second screening grid frame (2) are connected to the support frame (4) via buffer springs; the second screening grid frame (2) extends to the lower side of the crushing cylinder (3); and a plurality of material discharge through holes (301) are provided below the crushing cylinder (3); One end of the baffle plate (33) is fixedly mounted on a side of the crushing cylinder (3) close to the first screening grid (1); the other end of the baffle plate (33) is provided with a supporting through hole (3302) sleeved on the crushing shaft (31); the end of the baffle plate (33) away from the inner wall of the crushing cylinder (3) is arranged to be inclined upward; and the crushing cylinder (3) is provided with a pushing mechanism (36) for pushing the material on the baffle plate (33) toward the crushing groove (3301); The pushing mechanism (36) comprises a pushing plate (361), both ends of which are fixedly mounted with limit shafts (362); a sliding rod (363) is arranged on the end surface of the pushing plate (361) facing the inner wall of the crushing cylinder (3); the other end of the sliding rod (363) passes through the crushing cylinder (3); an elastic member (364) is sleeved on the outer side of the sliding rod (363); one end of the elastic member (364) is connected to the outer wall of the crushing cylinder (3); the elastic member (364) is used to drive the sliding rod (363) to move towards the pushing plate (361); a driving disk (34) is arranged inside the crushing cylinder (3) for intermittently limiting the moving position of the pushing plate (361); The driving disc (34) is fixedly arranged at both ends of the crushing shaft (31), and the driving disc (34) is provided with a driving groove (3401) for the limiting shaft (362) to extend into.

2. A double-stage linkage vibrating screen device for building screening according to claim 1, characterized in that: A driving motor (61) is fixedly mounted on the fixed frame (6), and a driving pulley (62) is provided on the crushing shaft (31). The driving motor (61) drives the driving pulley (62) to rotate, thereby driving the crushing shaft (31) to rotate.

3. A double-stage linkage vibrating screen device for building screening according to claim 2, characterized in that: A linkage pulley (64) is coaxially fixedly mounted on the crushing shaft (31), a vibration component (63) is arranged below the linkage pulley (64), and the linkage pulley (64) drives the vibration component (63) to rotate via a transmission belt.

4. A double-stage linkage vibrating screen device for building screening according to claim 3, characterized in that: The vibration component (63) comprises a rotating pulley (631), and the linkage pulley (64) drives the rotating pulley (631) to rotate via a transmission belt. One side of the rotating pulley (631) is rotatably connected to the support frame (4), and the other side of the rotating pulley (631) is eccentrically provided with an eccentric shaft (632). A connecting block (23) is provided on the side of the second screening frame (2), and a strip guide hole (2301) is provided on the connecting block (23) for the eccentric shaft (632) to extend into.

5. A double-stage linkage vibrating screen device for building screening according to claim 4, characterized in that: A right-angle plate (12) is fixedly mounted on both sides of the first screening grid (1), and a rotation mounting hole is provided on the right-angle plate (12). A rotation connecting shaft (21) is fixedly mounted on the upper end of the second screening grid (2). When the second screening grid (2) is mounted below the first screening grid (1), the two ends of the rotation connecting shaft (21) respectively pass through the rotation mounting holes on the two right-angle plates (12).

6. A double-stage linkage vibrating screen device for building screening according to claim 5, characterized in that: Each group of the fan-shaped crushing wheels (32) comprises a plurality of fan-shaped crushing wheels (32) distributed in a ring shape. During rotation, the plurality of fan-shaped crushing wheels (32) pass through the crushing grooves (3301) in sequence.

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