Multi-stage screening device based on crushing and recycling of industrial abandoned stable graded broken stone

Abstract

The invention provides a multi-stage screening device based on industrial abandoned stable graded broken stone crushing and recycling. The multi-stage screening device comprises a supporting base, an overturning fixing frame, a screening mechanism and a driving mechanism. And the overturning fixing frame is obliquely arranged above the supporting base, and the overturning fixing frame is provided with a material receiving groove and a guide-out groove which are arranged at an interval. The multiple screening mechanisms are sequentially arranged between the material receiving groove and the guiding-out groove. Each screening mechanism is in sliding connection with the overturning fixing frame in the width direction of the supporting base. Each screening mechanism is provided with a screening groove. The driving mechanism can drive all the screening mechanisms to reciprocate. According to the multi-stage screening device based on crushing and recycling of the industrial abandoned stable graded broken stone, through the multiple screening mechanisms communicating in sequence, multi-stage screening of the broken stone can be directly achieved, follow-up re-screening treatment is avoided, the matching requirement of continuous grading is met, the construction progress requirement of infrastructure can be met, and practicability is high.

Description

Technical Field

[0001] The invention belongs to the technical field of crushing and processing of industrial waste stabilized graded gravel, and particularly relates to a multi-stage screening device based on the crushing and reuse of industrial waste stabilized graded gravel. Background Art

[0002] With the rapid development of infrastructure in recent years, industrial waste stabilized graded gravel (such as solid cement blocks, coal gangue, and tailings) has accumulated in large quantities. Using industrial waste stabilized graded gravel in base structures (road base or subbase) to replace mined natural sand and stone can not only save investment and protect the environment, but also create positive social benefits.

[0003] In the prior art, when it comes to the reuse process of industrial abandoned stable graded gravel, it is usually necessary to first crush it through a crusher, and the gravel discharged from the crusher outlet will be screened to obtain aggregate components. However, research on industrial abandoned stable graded gravel shows that its fatigue resistance and durability as an aggregate will be reduced, partly because the particle size composition ratio of the aggregate cannot reach continuous grading. Screening usually uniformly screens out gravel below the target particle size, for example, the sieve hole is 15mm, and the resulting gravel particle size is usually less than 15mm, and the screening function is single. The particle size distribution of this part of gravel is uneven, and direct use will inevitably fail to meet the requirements of the continuous grading ratio. Subsequent use also requires multiple conveyor belts for multiple screenings, which cannot meet the construction progress of infrastructure construction and will also increase the consumption of manpower and material resources. Summary of the Invention

[0004] The embodiment of the present invention provides a multi-stage screening device based on the crushing and reuse of industrial waste stable graded gravel, aiming to solve the problem of poor practicality of existing screening devices due to the single screening function.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is to provide a multi-stage screening device based on the crushing and reuse of industrial waste stable graded gravel, comprising: Support base; A flip fixing frame is obliquely arranged above the support base, and the flip fixing frame has a material receiving groove and a discharge groove arranged at intervals; There are multiple screening mechanisms, each of which is arranged in sequence between the receiving trough and the outlet trough; each of the screening mechanisms is slidably connected to the flip fixing frame along the width direction of the support base; each of the screening mechanisms has a screening trough, and the sieve holes at the bottom of each screening trough gradually increase from top to bottom; A driving mechanism, fixed on the flipping and fixing frame, for driving each of the screening mechanisms to move back and forth; The receiving trough, the screening troughs and the outlet trough are connected in sequence to form a screening space for gravel to pass through.

[0006] In one possible implementation, the support base includes: The support has a connecting portion at one end for rotationally connecting the flip fixing frame; the support is provided with a plurality of material distribution troughs, each of which corresponds to each of the screening mechanisms and is used to receive the crushed stones dropped from each of the screening mechanisms; The adjusting structure is arranged at the other end of the support and is connected to the flip fixing frame, and is used for adjusting the inclination of the flip fixing frame.

[0007] In a possible implementation, each of the screening mechanisms includes: The sliding frame has a bottom end slidably connected to the sliding rod on the flip fixing frame, and has a groove with an open top; two opposite side walls of the groove are provided with notches in the length direction of the flip fixing frame; and a through opening is provided at the bottom of the groove; A sieve plate is arranged at the through opening, and the sieve holes are evenly distributed on the surface of the sieve plate; the sieve plate and the sliding frame are enclosed to form the screening slot; The fixing rod is arranged along the width direction of the flip fixing frame, one end of which is fixedly connected to the sliding frame, and the other end of which passes through the flip fixing frame and is connected to the driving mechanism.

[0008] In a possible implementation, the sieve plate and the slide frame are detachably connected.

[0009] In a possible implementation, the multi-stage screening device based on crushing and recycling of industrial waste stabilized graded gravel further includes a damping mechanism, wherein a plurality of damping mechanisms are provided, and each damping mechanism corresponds to each screening mechanism one by one; each damping mechanism includes: There are two cross bars, which are spaced apart at the top of the corresponding sliding frame along the length direction of the flip fixing frame, and each cross bar is arranged along the width direction of the flip fixing frame; There are two guide wheels, both of which are rotatably arranged on the two cross bars, and the rotation axes are arranged along the normal direction of the screen plate; The slide is slidably connected to the guide column provided at the top of the slide frame along the length direction of the flip and fixed frame; the bottom end of the slide is provided with a plurality of connection parts spaced apart along the length direction of the flip and fixed frame; There are multiple material shifting structures, each of which corresponds to each of the connecting parts; Two pull ropes are provided; one end of one of the pull ropes is connected to one side wall of the flip fixing frame, and the other end is connected to one end of the slide after passing through one of the guide wheels; one end of the other pull rope is connected to the other side wall of the flip fixing frame, and the other end is connected to the other end of the slide after passing through the other guide wheel; Among them, as the sliding frame moves back and forth, the two pull ropes pull the slide respectively, causing the slide to move back and forth on the sliding frame, and at the same time drive each material-shifting structure to shift the gravel in the screening trough only when moving toward the receiving trough.

[0010] In a possible implementation, each of the material-selecting structures includes: The top of the material stripping plate is rotatably connected to the corresponding connecting portion, and the rotation axis is arranged along the width direction of the flip fixing frame; the top of the plate surface of the material stripping plate facing the guide groove is provided with an abutment block; A limit block is provided on the corresponding connecting portion and is provided corresponding to the abutment block; Wherein, as the slide moves toward the material receiving trough, the material stripping plate flips toward the direction of the guide trough, and maintains the normal setting along the screen plate after the contact block contacts the limit block.

[0011] In a possible implementation, the driving mechanism includes: There are multiple rotating shafts, each of which is arranged along the normal direction of the sieve plate and is rotatably connected to the flip fixing frame; There are multiple eccentric wheels, each of which is connected to each of the rotating shafts; each of the eccentric wheels is provided with a connecting column spaced apart from the corresponding rotating shaft; There are multiple connecting rods, each of which corresponds to each fixed rod one by one, one end of each connecting rod is rotatably connected to the corresponding end of the fixed rod, and the other end is rotatably connected to the corresponding connecting column in the eccentric wheel; There are multiple worm gears, each of which is connected to each of the rotating shafts; A drive shaft is rotatably arranged on the flip and fixed frame along the length direction of the flip and fixed frame; a plurality of worm parts are provided on the drive shaft, and each worm part corresponds to and meshes with each worm wheel; A driver is connected to one end of the drive shaft in power.

[0012] In a possible implementation, for any two adjacent eccentric wheels, the angle between the vector direction of each connecting column to the corresponding rotating shaft is 180°, so as to enable the two adjacent sliding frames to slide in an interlaced manner.

[0013] In this implementation, the tilted flip fixed frame can ensure that an environment is provided for the gravel to fall by gravity, and at the same time, the receiving trough on the flip fixed frame can receive the gravel delivered from the outside. A plurality of screening mechanisms are arranged between the receiving trough and the outlet trough. The screening trough in each screening mechanism is connected to the receiving trough and the outlet trough in sequence to form a screening space. Each screening mechanism can correspond to gravel of different particle sizes, thereby realizing multi-stage screening of the gravel. The driving mechanism can ensure that each screening mechanism is driven to move back and forth in the width direction of the support base, thereby providing a drive for each gravel to move downward along the screening space at any time. At the same time, each screening mechanism moves back and forth independently, which can also ensure that the gravel is dynamic and the screening effect is guaranteed. Through multiple screening mechanisms connected in sequence, multi-stage screening of gravel can be directly realized, avoiding subsequent re-screening processing, facilitating the proportioning requirements of continuous grading, and adapting to the construction progress requirements of infrastructure construction, with strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the structure of a multi-stage screening device based on crushing and recycling of industrial waste stable graded gravel provided by an embodiment of the present invention Figure 1 ; Figure 2 Schematic diagram of the structure of a multi-stage screening device based on crushing and recycling of industrial waste stable graded gravel provided by an embodiment of the present invention Figure 2 ; Figure 3 A schematic diagram of the top view of a multi-stage screening device for crushing and reusing industrial waste stabilized graded gravel provided by an embodiment of the present invention Figure 1 ; Figure 4 for Figure 3 The enlarged structural diagram of point A of the multi-stage screening device based on the crushing and reuse of industrial waste stable graded gravel is shown; Figure 5 A schematic diagram of the top view of a multi-stage screening device for crushing and reusing industrial waste stabilized graded gravel provided by an embodiment of the present invention Figure 2 (Hidden damping structure); Figure 6 A schematic side view of a multi-stage screening device for crushing and reusing industrial waste stabilized graded gravel provided by an embodiment of the present invention; Figure 7 A schematic structural diagram of the material dispensing structure of a multi-stage screening device based on the crushing and reuse of industrial waste stabilized graded gravel provided in an embodiment of the present invention.

[0015] Description of reference numerals: 10. Support base; 11. Support; 12. Material distribution trough; 13. Adjustment structure; 20. Flip fixing frame; 21. Material receiving trough; 22. Lead-out trough; 23. Slide rod; 30. Screening mechanism; 31. Sliding frame; 32. Screen plate; 33. Fixing rod; 34. Flanging; 35. Screening trough; 40. Driving mechanism; 41. Rotating shaft; 42. Eccentric wheel; 43. Connecting column; 44. Worm gear; 45. Worm gear; 46. Driving shaft; 47. Driver; 48. Connecting rod; 50. Damping mechanism; 51. Crossbar; 52. Guide wheel; 53. Slide; 54. Material shifting structure; 541. Material shifting plate; 542. Abutment block; 543. Limiting block; 55. Pull rope; 56. Guide column. DETAILED DESCRIPTION

[0016] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0017] Please also refer to Figure 1 and Figure 2 , the multi-stage screening device based on the crushing and reuse of industrial waste stable graded gravel provided by the present invention is now described. The multi-stage screening device based on the crushing and reuse of industrial waste stable graded gravel includes a support base 10, a flip fixed frame 20, a screening mechanism 30 and a driving mechanism 40. The flip fixed frame 20 is tilted above the support base 10, and the flip fixed frame 20 has a material receiving trough 21 and a discharge trough 22 that are spaced apart. There are multiple screening mechanisms 30, and each screening mechanism 30 is arranged in sequence between the material receiving trough 21 and the discharge trough 22. Each screening mechanism 30 is slidably connected to the flip fixed frame 20 along the width direction of the support base 10. Each screening mechanism 30 has a screening trough 35, and the sieve holes at the bottom of each screening trough 35 gradually increase from top to bottom. The driving mechanism 40 is fixed on the flip fixed frame 20 and can drive each screening mechanism 30 to move back and forth. The receiving trough 21, the screening troughs 35 and the outlet trough 22 are connected in sequence to form a screening space for the crushed stones to pass through.

[0018] Specifically, the tilted fixed frame 20 has a receiving trough 21 located above the guide trough, with a certain height difference between the two. The crushed stone formed by the crusher can be transported to the receiving trough 21 of the tilted fixed frame 20 by a conveying mechanism. As the driving mechanism 40 drives the screening mechanisms 30 to move back and forth, the crushed stone at the bottom of the screening trough 35 will be subjected to the inertial force and move back and forth, which will cause the crushed stone to temporarily separate from the bottom of the screening trough 35. Then, under the action of gravity, the crushed stone will gradually move along the screening space toward the guide trough 22. As the sieve aperture at the bottom of the screening trough 35 gradually increases from top to bottom, each screening mechanism 30 can gradually screen gravel of different particle sizes. Gravel with larger particle sizes will be discharged from the guide trough 22 for further crushing.

[0019] The multi-stage screening device provided in this embodiment is based on the crushing and reuse of industrial waste stable graded gravel. Compared with the prior art, the tilted fixed frame 20 can ensure that the gravel provides an environment where it can fall by gravity. At the same time, the receiving trough 21 on the flip fixed frame 20 can receive the gravel transferred from the outside. A plurality of screening mechanisms 30 are set between the receiving trough 21 and the outlet trough 22. The screening trough 35 in each screening mechanism 30 is connected with the receiving trough 21 and the outlet trough 22 in sequence to form a screening space. Each screening mechanism 30 can correspond to gravel of different particle sizes, thereby achieving multi-stage screening of gravel. The driving mechanism 40 can ensure that each screening mechanism 30 is driven to move back and forth in the width direction of the support base 10, thereby providing a drive for each gravel to move downward along the screening space at any time. At the same time, each screening mechanism 30 moves back and forth independently, which can also ensure that the gravel is dynamic and the screening effect is guaranteed. Through a plurality of screening mechanisms 30 connected in sequence, multi-stage screening of crushed stone can be directly achieved, thus avoiding subsequent re-screening processing, facilitating the proportioning requirements of continuous grading, adapting to the construction progress requirements of infrastructure, and having strong practicality.

[0020] In this embodiment, the flipping and fixing frame 20 can be a rectangular frame for ease of manufacturing.

[0021] In some embodiments, the support base 10 may be Figure 1 and Figure 2 The structure shown. Figure 1 and Figure 2 The support base 10 includes a support 11 and an adjustment structure 13. One end of the support 11 has a connection portion for the rotational connection of the flip-fixing frame 20. The support 11 is provided with multiple distribution troughs 12, each corresponding to a screening mechanism 30 and capable of receiving the gravel dropped from each screening mechanism 30. The adjustment structure 13 is provided at the other end of the support 11 and is connected to the flip-fixing frame 20, capable of adjusting the inclination of the flip-fixing frame 20.

[0022] The support 11 ensures support for the tilting and fixing frame 20 and, driven by the adjustment structure 13, can also adjust the inclination of the tilting and fixing frame 20. This structure ensures that the downward speed of the crushed stone can be adjusted. Multiple distribution troughs 12 are provided on the support 11. Each distribution trough 12 corresponds to each screening mechanism 30 in the vertical direction. That is, the crushed stone screened by each screening mechanism 30 will fall into the corresponding distribution trough 12 and then be discharged through the outlet of the distribution trough 12. This structure ensures that the crushed stone at the screening site is collected.

[0023] The support 11 can have a certain height, and the outlet of each distribution trough 12 can extend outward, as shown in FIG. Figure 1 , to ensure that the bucket of the transfer vehicle can be located below the outlet of the material distribution trough 12 and directly collect the screened gravel.

[0024] In this embodiment, the adjustment structure 13 can be a self-locking hydraulic cylinder. There are two self-locking hydraulic cylinders, which are respectively arranged on both sides of the support 11. Each self-locking hydraulic cylinder has a fixed end and a telescopic end. The fixed end is rotatably connected to the support 11, and the telescopic end is rotatably connected to the flip fixing frame 20. Figure 1 .

[0025] It should be noted that when the tilting fixing frame 20 is tilted, a gap is formed between it and the support 11. A flexible canvas or other device can be placed around this gap to prevent the gravel from leaking out. Furthermore, when the tilting angle of the tilting fixing frame 20 is adjusted, the vertical projections of its screening slots 35 will inevitably move. However, because the tilting angle of the tilting fixing frame 20 is very small, the lateral displacement is negligible and will not affect the falling of the gravel into the corresponding distribution trough 12.

[0026] In some embodiments, the screening mechanism 30 may be configured as follows: Figures 1 to 3 ,and Figure 5 The structure shown. Figures 1 to 3 ,and Figure 5 Each screening mechanism 30 includes a sliding frame 31, a sieve plate 32 and a fixing rod 33. The bottom end of the sliding frame 31 is slidably connected to the sliding rod 23 on the flip fixing frame 20, and has a groove with an open top. In the length direction of the flip fixing frame 20, the two opposite side walls of the groove are provided with notches. The bottom of the groove is provided with a through opening. The sieve plate 32 is arranged at the through opening, and the surface of the sieve plate 32 is evenly distributed with sieve holes. The sieve plate 32 and the sliding frame 31 enclose a screening slot 35. The fixing rod 33 is arranged along the width direction of the flip fixing frame 20, one end is fixedly connected to the sliding frame 31, and the other end passes through the flip fixing frame 20 and is connected to the driving mechanism 40.

[0027] The sliding frame 31 is slidably connected to the slide rod 23 on the tilting fixed frame 20. The width of the sliding frame 31 is smaller than that of the tilting fixed frame 20 to ensure that the sliding frame 31 can reciprocate on the slide rod 23. The groove at the top of the sliding frame 31 can be enclosed by the screen plate 32 to form a screening slot 35, which facilitates the screening of gravel. The fixed rod 33 is fixedly connected to the sliding frame 31, extends through the tilting fixed frame 20, and is connected to the drive mechanism 40. This structure ensures that the drive mechanism 40 drives the sliding frame 31 to reciprocate via the fixed rod 33, thereby achieving the screening of gravel and ensuring the screening effect.

[0028] In some embodiments, the sieve plate 32 may be formed as follows: Figure 5 The structure shown. Figure 5 The sieve plate 32 and the slide frame 31 are detachably connected, which can ensure that the sieve plate 32 can be replaced according to actual needs, thereby ensuring that the size of the sieve hole can be randomly adjusted to increase adaptability.

[0029] Specifically, the through opening may be a rectangular opening, and the sieve plate 32 and the through opening may be connected by bolts.

[0030] In some embodiments, see Figure 3 and Figure 4 The multi-stage screening device based on the crushing and reuse of industrial abandoned stable graded gravel also includes a damping mechanism 50 , and a plurality of damping mechanisms 50 are provided, and each damping mechanism 50 corresponds to each screening mechanism 30 one by one.

[0031] Each damping mechanism 50 comprises a crossbar 51, guide wheels 52, a carriage 53, a material-dispensing mechanism 54, and a pull rope 55. Two crossbars 51 are provided, spaced apart along the length of the tilting and fixing frame 20 at the top of the corresponding slide frame 31. Each crossbar 51 is positioned along the width of the tilting and fixing frame 20. Two guide wheels 52 are provided, each rotatably mounted on the two crossbars 51, with its axis of rotation aligned with the normal direction of the sieve plate 32. The carriage 53 is slidably connected to a guide post 56 at the top of the slide frame 31 along the length of the tilting and fixing frame 20. The bottom end of the carriage 53 is provided with multiple connecting portions spaced apart along the length of the tilting and fixing frame 20. Multiple material-dispensing mechanisms 54 are provided, each corresponding to a corresponding connecting portion. Two pull ropes 55 are provided. One end of each pull rope 55 is connected to a side wall of the tilting and fixing frame 20, and the other end passes around one of the guide wheels 52 and connects to one end of the carriage 53. One end of another pull rope 55 is connected to the other side wall of the flip fixing frame 20 , and the other end passes around another guide wheel 52 and is connected to the other end of the slide 53 .

[0032] After the gravel enters each screening slot 35, the gravel layer will have a certain thickness. At this time, although the screening mechanism 30 reciprocates, it is not enough to completely screen the gravel, and some gravel may not be screened out of the corresponding screening slot 35. The damping mechanism 50 in this embodiment can use multiple material-moving structures 54 to move the gravel upward by a certain distance, thereby extending the residence time of the gravel in each screening slot 35 and ensuring the screening effect.

[0033] Specifically, as the slide frame 31 reciprocates, the two pull ropes 55 pull the slide 53 respectively, causing the slide 53 to reciprocate on the slide frame 31, and at the same time driving each material-diverting structure 54 to dig the gravel in the screening trough 35 only when moving toward the receiving trough 21. When the slide frame 31 is located in the middle position of the flip-fixed frame 20 in the width direction of the flip-fixed frame 20, the slide 53 is located in the middle position of the guide column 56. Figure 4 When the slide frame 31 moves leftward, a pull cord 55 connected to the right side wall of the flip-fixed frame 20 pulls the carriage 53 downward. When the slide frame 31 moves rightward, a pull cord 55 connected to the left side wall of the flip-fixed frame 20 pulls the carriage 53 upward. Multiple material-moving structures 54 connected to the carriage 53 via connecting portions move the crushed stone upward a certain distance as the carriage 53 moves upward, ensuring the stone's residence time within the screening trough 35 and ensuring a multi-stage screening effect.

[0034] In some embodiments, the material-selecting structure 54 may be configured as follows: Figure 7 The structure shown. Figure 7 Each material-diverting structure 54 includes a diverting plate 541 and a stopper 543. The top end of the diverting plate 541 is rotatably connected to the corresponding connecting portion, and the axis of rotation is arranged along the width direction of the flip-fixing frame 20. An abutment block 542 is provided on the top surface of the diverting plate 541 facing the outlet slot 22. The stopper 543 is provided on the corresponding connecting portion and corresponds to the abutment block 542.

[0035] In which, as the slide 53 moves toward the material receiving trough 21, the material removing plate 541 flips toward the direction of the outlet trough 22, and maintains the normal setting along the screen plate 32 after the contact block 542 contacts the limit block 543.

[0036] The abutment block 542 on the material-dispensing plate 541 corresponds to the limit block 543 on the connecting part to ensure that the material-dispensing plate 541 can only be flipped toward the receiving trough 21 on the basis of being set in the normal direction of the screen plate 32, so as to ensure that the material-dispensing plate 541 can shift the gravel at the bottom as the slide 53 goes up, and can automatically flip over as the slide 53 goes down to avoid shifting the gravel downward, further ensuring the time the gravel stays in the screening trough 35, and ensuring the multi-stage screening effect of the gravel.

[0037] In some embodiments, the driving mechanism 40 may be configured as follows: Figures 2 to 6 The structure shown. Figures 2 to 6 The drive mechanism 40 includes a rotating shaft 41, an eccentric wheel 42, a connecting rod 48, a worm wheel 44, a drive shaft 46, a worm portion 45, and a driver 47. There are multiple rotating shafts 41, each of which is arranged along the normal direction of the sieve plate 32 and is rotatably connected to the flip fixed frame 20. There are multiple eccentric wheels 42, each of which is connected to each rotating shaft 41. Each eccentric wheel 42 is provided with a connecting column 43 spaced apart from the corresponding rotating shaft 41. There are multiple connecting rods 48, each of which corresponds to each fixed rod 33. One end of each connecting rod 48 is rotatably connected to the end of the corresponding fixed rod 33, and the other end is rotatably connected to the connecting column 43 in the corresponding eccentric wheel 42. There are multiple worm wheels 44, each of which is connected to each rotating shaft 41. The drive shaft 46 is rotatably arranged on the flip fixed frame 20 along the length direction of the flip fixed frame 20. The drive shaft 46 is provided with a plurality of worm portions 45 , each of which corresponds to and meshes with each of the worm wheels 44 . A driver 47 is connected to one end of the drive shaft 46 in a power connection.

[0038] A driver 47 drives the drive shaft 46, which in turn drives the worm gears 44 in synchronous rotation, achieving speed reduction while ensuring power synchronization and long-distance power transmission. Each worm gear 44 drives its corresponding eccentric 42, which is power-connected to the fixed rod 33 via a corresponding connecting rod 48. Each rotation of the eccentric 42 drives the slide frame 31 through the connecting column 43 to achieve one reciprocating motion.

[0039] This structure can ensure synchronous driving of multiple screening mechanisms 30 and independent driving of each screening mechanism 30, thereby ensuring the screening effect and reducing energy consumption.

[0040] In this embodiment, the connecting column 43 on each eccentric wheel 42 can be set to an adjustable type, that is, the distance between the connecting column 43 and the corresponding rotating shaft 41 is adjustable. For example, a plurality of connecting holes are provided at intervals on the eccentric wheel 42, and the connecting column 43 is fixed to any connecting hole on the eccentric wheel 42 by means of a bolt, that is, the bolt passes through the connecting shaft and is threadedly connected to the connecting hole. This structure ensures that the reciprocating stroke of each screening mechanism 30 can be independently adjusted. For example, the topmost screening mechanism 30 is used to screen gravel with a smaller particle size and can be set to the maximum stroke, while the bottommost screening mechanism 30 is used to screen gravel with a larger particle size. The amount of gravel will decrease when it reaches this point, and screening can be achieved without making too many reciprocating movements, so it can be set to the minimum stroke.

[0041] In some embodiments, the driving mechanism 40 may be configured as follows: Figures 2 to 4 The structure shown. Figures 2 to 4For any two adjacent eccentric wheels 42 , the angle between the vector direction of each connecting column 43 and the corresponding rotating shaft 41 is 180°, which enables two adjacent sliding frames 31 to slide in an interlaced manner.

[0042] By arranging the connecting posts 43 on two adjacent eccentric wheels 42, the two adjacent slide frames 31 can slide in an interlaced manner. For example, when one slide frame 31 moves to the left, the adjacent slide frame 31 moves to the right, thereby ensuring overall force balance and the stability of the entire device. In addition, the crushed stone can be irregularly disturbed to ensure a multi-stage screening effect.

[0043] It should be noted that, in the case of staggered movement, notches are formed at both ends of each sliding frame 31 along the length direction of the flip fixing frame 20 by means of flanges 34, as shown in FIG. Figure 5 , to avoid leakage of gravel.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multi-stage screening device based on the crushing and reuse of industrial waste stable graded gravel, characterized by: include: Support base; A flip fixing frame is obliquely arranged above the support base, and the flip fixing frame has a material receiving groove and a discharge groove arranged at intervals; There are multiple screening mechanisms, each of which is arranged in sequence between the receiving trough and the outlet trough; each of the screening mechanisms is slidably connected to the flip fixing frame along the width direction of the support base; each of the screening mechanisms has a screening trough, and the sieve holes at the bottom of each screening trough gradually increase from top to bottom; A driving mechanism, fixed on the flipping and fixing frame, for driving each of the screening mechanisms to move back and forth; The receiving trough, the screening troughs and the outlet trough are connected in sequence to form a screening space for gravel to pass through.

2. The multi-stage screening device based on crushing and recycling of industrial waste stable graded gravel according to claim 1, characterized in that: The support base comprises: The support has a connecting portion at one end for rotationally connecting the flip fixing frame; the support is provided with a plurality of material distribution troughs, each of which corresponds to each of the screening mechanisms and is used to receive the crushed stones dropped from each of the screening mechanisms; The adjusting structure is arranged at the other end of the support and is connected to the flip fixing frame, and is used for adjusting the inclination of the flip fixing frame.

3. The multi-stage screening device based on crushing and recycling of industrial waste stable graded gravel according to claim 1, characterized in that: Each of the screening mechanisms comprises: The sliding frame has a bottom end slidably connected to the sliding rod on the flip fixing frame, and has a groove with an open top; two opposite side walls of the groove are provided with notches in the length direction of the flip fixing frame; and a through opening is provided at the bottom of the groove; A sieve plate is arranged at the through opening, and the sieve holes are evenly distributed on the surface of the sieve plate; the sieve plate and the sliding frame are enclosed to form the screening slot; The fixing rod is arranged along the width direction of the flip fixing frame, one end of which is fixedly connected to the sliding frame, and the other end of which passes through the flip fixing frame and is connected to the driving mechanism.

4. The multi-stage screening device based on crushing and recycling of industrial waste stable graded gravel according to claim 3, characterized in that: The sieve plate and the slide frame are detachably connected.

5. The multi-stage screening device based on crushing and recycling of industrial waste stable graded gravel according to claim 3, characterized in that: The multi-stage screening device based on crushing and recycling of industrial waste stable graded gravel also includes a damping mechanism, wherein a plurality of damping mechanisms are provided, and each damping mechanism corresponds to each screening mechanism one by one; each damping mechanism includes: There are two cross bars, which are spaced apart at the top of the corresponding sliding frame along the length direction of the flip fixing frame, and each cross bar is arranged along the width direction of the flip fixing frame; There are two guide wheels, both of which are rotatably arranged on the two cross bars, and the rotation axes are arranged along the normal direction of the screen plate; The slide is slidably connected to the guide column provided at the top of the slide frame along the length direction of the flip and fixed frame; the bottom end of the slide is provided with a plurality of connection parts spaced apart along the length direction of the flip and fixed frame; There are multiple material shifting structures, each of which corresponds to each of the connecting parts; Two pull ropes are provided; one end of one of the pull ropes is connected to one side wall of the flip fixing frame, and the other end is connected to one end of the slide after passing through one of the guide wheels; one end of the other pull rope is connected to the other side wall of the flip fixing frame, and the other end is connected to the other end of the slide after passing through the other guide wheel; Among them, as the sliding frame moves back and forth, the two pull ropes pull the slide respectively, causing the slide to move back and forth on the sliding frame, and at the same time drive each material-shifting structure to shift the gravel in the screening trough only when moving toward the receiving trough.

6. The multi-stage screening device based on crushing and recycling of industrial waste stable graded gravel according to claim 5, characterized in that: Each of the material shifting structures comprises: The top of the material stripping plate is rotatably connected to the corresponding connecting portion, and the rotation axis is arranged along the width direction of the flip fixing frame; the top of the plate surface of the material stripping plate facing the guide groove is provided with an abutment block; A limit block is provided on the corresponding connecting portion and is provided corresponding to the abutment block; Wherein, as the slide moves toward the material receiving trough, the material stripping plate flips toward the direction of the guide trough, and maintains the normal setting along the screen plate after the contact block contacts the limit block.

7. The multi-stage screening device based on crushing and recycling of industrial waste stable graded gravel according to claim 3, characterized in that: The driving mechanism comprises: There are multiple rotating shafts, each of which is arranged along the normal direction of the sieve plate and is rotatably connected to the flip fixing frame; There are multiple eccentric wheels, each of which is connected to each of the rotating shafts; each of the eccentric wheels is provided with a connecting column spaced apart from the corresponding rotating shaft; There are multiple connecting rods, each of which corresponds to each fixed rod one by one, one end of each connecting rod is rotatably connected to the corresponding end of the fixed rod, and the other end is rotatably connected to the corresponding connecting column in the eccentric wheel; There are multiple worm gears, each of which is connected to each of the rotating shafts; A drive shaft is rotatably arranged on the flip and fixed frame along the length direction of the flip and fixed frame; a plurality of worm parts are provided on the drive shaft, and each worm part corresponds to and meshes with each worm wheel; A driver is connected to one end of the drive shaft in power.

8. The multi-stage screening device based on crushing and recycling of industrial waste stable graded gravel according to claim 7, characterized in that: For any two adjacent eccentric wheels, the angle between the vector direction of each connecting column and the corresponding rotating shaft is 180°, so as to enable the two adjacent sliding frames to slide in an interlaced manner.

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