阅读说明：本技术 一种混凝土预制板加工用的分级上料装置 (Grading feeding device for processing concrete precast slab ) 是由 刘磊 李秀民 郑飞虎 于 2020-12-19 设计创作，主要内容包括：本发明公开一种混凝土预制板加工用的分级上料装置,包括底座,底座上固定安装若干立柱,立柱顶部固定安装二层平台,二层平台顶部中间固定安装进料斗,进料斗上方左侧设有第一传送带,进料斗内部设有均料机构,进料斗底部与筛选机构的进料端连接,筛选箱外壁固定安装清洁机构,筛选箱下方设有第二传送带,第二传送带对应出料口处设有缓冲机构。该装置进料斗内部设有均料机构,可以防止砂石朝一侧落下导致进料斗内堵塞,通过筛选筒和环形滤网逐级将粒径较大的砂石筛选出来,实现不同粒径砂石的筛选,通过弹簧杆切换可以使清洁刷与环形滤网贴合,采用毛刷和清水结合对环形滤网进行有效清洗,同时出料时通过缓冲机构保证传送带稳定运行。(The invention discloses a grading feeding device for processing a concrete precast slab, which comprises a base, wherein a plurality of stand columns are fixedly arranged on the base, a two-layer platform is fixedly arranged at the tops of the stand columns, a feeding hopper is fixedly arranged in the middle of the top of the two-layer platform, a first conveying belt is arranged on the left side above the feeding hopper, a material homogenizing mechanism is arranged inside the feeding hopper, the bottom of the feeding hopper is connected with a feeding end of a screening mechanism, a cleaning mechanism is fixedly arranged on the outer wall of a screening box, a second conveying belt is arranged below the screening box, and a buffering mechanism is arranged at the. The device feeder hopper is inside to be equipped with the homocline mechanism, can prevent that the grit from leading to blocking up in the feeder hopper towards one side fall, screens out the great grit of particle diameter step by step through a screening section of thick bamboo and annular filter screen, realizes the screening of different particle diameter grits, switches through the spring beam and can make cleaning brush and annular filter screen laminating, adopts brush and clear water to combine effectively to wash annular filter screen, guarantees conveyer belt steady operation through buffer gear during the ejection of compact simultaneously.)

1. The grading feeding device for processing the concrete precast slabs is characterized by comprising a base (1), wherein a plurality of stand columns (2) are fixedly installed on the base (1), a two-layer platform (3) is fixedly installed at the tops of the stand columns (2), a feeding hopper (4) is fixedly installed in the middle of the top of the two-layer platform (3), a first conveying belt (5) is arranged on the left side above the feeding hopper (4), a material homogenizing mechanism (8) is arranged inside the feeding hopper (4), the bottom of the feeding hopper (4) is connected with the feeding end of a screening mechanism (9), the screening mechanism (9) comprises a screening box (10), the screening box (10) is fixedly installed on the stand columns (2), a plurality of partition plates (11) are vertically arranged inside the screening box (10), the partition plates (11) divide the inside of the screening box (10) into a plurality of screening chambers (12), and a screening barrel (13) is horizontally arranged inside the screening box (10), screening cylinder (13) rotate with screening case (10) and baffle (11) and be connected, feed inlet (14) have been seted up to screening cylinder (13) one end, the output shaft meshing of gear and first motor (15) is passed through to screening cylinder (13) other end, first motor (15) fixed mounting is at screening case (10) outer wall, screening cylinder (13) surface all is equipped with annular filter screen (16) to each screening chamber (12) department of using, screening chamber (12) bottom is equipped with discharge gate (17), the clean mechanism of screening case (10) outer wall fixed mounting (18), screening case (10) below is equipped with second conveyer belt (19), second conveyer belt (19) correspond discharge gate (17) department and are equipped with buffer gear (20).

2. The grading feeding device for processing the concrete precast slab, according to the claim 1, is characterized in that the first conveyor belt (5) is horizontally and fixedly installed on the two-layer platform (3), the first conveyor belt (5) is driven by a second motor (21), the second motor (21) is fixedly installed on the surface of the two-layer platform (3), and the discharge end of the first conveyor belt (5) is arranged right above the material homogenizing mechanism (8).

3. The grading feeding device for processing the concrete precast slab as recited in claim 1 or 2, wherein the homogenizing mechanism (8) comprises a triangular table (22), the material containing grooves (23) are symmetrically formed in two sides of the top of the triangular table (22), a rotating shaft (24) is fixedly installed in the middle of the bottom of the triangular table (22), two ends of the rotating shaft (24) are rotatably connected with the inner wall of the feeding hopper (4), stop levers (25) are symmetrically arranged on two sides below the rotating shaft (24), the stop levers (25) are parallel to the rotating shaft (24), and the stop levers (25) are fixedly connected with the inner walls of two ends of the feeding hopper (4).

4. The grading feeding device for processing the concrete precast slab as recited in claim 1, wherein the screening cylinder (13) is in a circular truncated cone shape, the radius of one end of the screening cylinder (13) near the feeding port (14) is smaller than that of the other end, and the aperture of the annular filter screen (16) increases from one end of the screening cylinder (13) near the feeding port (14) to the other end.

5. The grading and feeding device for processing the concrete precast slabs according to claim 1, wherein the cleaning mechanism (18) comprises a box body (26), the box body (26) is fixedly installed on the outer wall of the screening box (10), a water inlet pipe (27) is horizontally arranged above the interior of the box body (26) in a penetrating manner, a plurality of cleaning assemblies (28) are fixedly installed at the bottom of the box body (26), the cleaning assemblies (28) correspond to the annular filter screens (16) in a one-to-one mode, and the water inlet pipe (27) is connected with the cleaning assemblies (28) through an elastic pipe (29).

6. The grading feeding device for processing the concrete precast slab, according to the claim 5, characterized in that the cleaning assembly (28) comprises a push rod (30), one end of the push rod (30) is fixedly provided with a cleaning brush (31), the other end of the push rod (30) is fixedly provided with a handle (32), the bottom of the push rod (30) is slidably connected with a slide rail (33), the slide rail (33) is fixedly arranged at the bottom of the box body (26), two sides of the push rod (30) are hinged with a spring rod (34), the other end of the spring rod (34) is hinged with a side plate (35), and the side plate (35) is fixedly arranged at the bottom of the box body (26) at two sides of the push rod (30);

the surface of the cleaning brush (31) is provided with a plurality of water spray nozzles, a water inlet pipeline is arranged inside the push rod (30), a water inlet is arranged on the surface of the push rod (30), and the water inlet is connected with a water inlet pipe (27) through an elastic pipe (29).

7. The graded feeding device for processing the concrete precast slab, according to the claim 1, characterized in that the spring rod (34) comprises a first connecting rod (341) and a second connecting rod (342), the first connecting rod (341) comprises a head and an inserting rod, the second connecting rod (342) comprises a head and a sleeve rod, the head of the first connecting rod (341) is hinged with the push rod (30), the inserting rod of the first connecting rod (341) is sleeved with the sleeve rod of the second connecting rod (342), the head of the second connecting rod (342) is hinged with the side plate (35), and the heads of the first connecting rod (341) and the second connecting rod (342) are connected through a first spring (343).

8. The grading and feeding device for processing the concrete precast slab, according to claim 1, is characterized in that the second conveyor belt (19) is horizontally and fixedly installed on the base (1), the second conveyor belt (19) is driven by a third motor (36), the third motor (36) is fixedly installed on the base (1), support plates (37) are fixedly installed on the upright columns at two sides of the second conveyor belt (19), and the buffer mechanism (20) is fixedly installed on the support plates (37).

9. The grading feeding device for processing the concrete precast slab as recited in claim 1 or 8, wherein the buffer mechanism (20) comprises a buffer roller (38), a sliding groove (39) is vertically formed on the support plate (37) corresponding to the buffer roller (38), a sliding block (40) is arranged in the sliding groove (39), the brightness of the buffer roller (38) is rotatably connected with the sliding block (40), the bottom of the sliding block (40) is slidably connected with the sliding groove (39), and the bottom of the sliding block (40) is connected with the sliding groove (39) through a second spring (41).

10. The graded feeding device for processing the concrete precast slab as recited in claim 1, wherein a fence (6) is fixedly installed on the edge of the upper surface of the two-layer platform (3) at the right side of the feeding hopper (4), and a staircase (7) is fixedly installed between the two-layer platform (3) and the base (1).

Technical Field

The invention relates to the field of concrete processing, in particular to a grading feeding device for processing a concrete precast slab.

Background

The common concrete is artificial stone which is prepared by taking cement as a main cementing material, adding water, sand, stones and chemical additives and mineral admixtures if necessary, mixing the materials according to a proper proportion, uniformly stirring, densely molding, curing and hardening. Concrete is mainly divided into two stages and states: plastic state before setting and hardening, namely fresh concrete or concrete mixture; hardened, i.e. hardened concrete or concrete. The generalized concrete is an artificial stone prepared from a cementing material, coarse and fine aggregates, water and other additives according to a proper proportion. In civil engineering, the most widely used is the ordinary concrete: the cement concrete is prepared by taking cement as a cementing material and sand and stone as aggregate and adding water for stirring.

The quality of stone gradation in concrete processing is greatly related to saving cement and ensuring good workability of concrete. In particular, stone gradation is more important when high-strength concrete is mixed. Adopt the sieving mechanism earlier usually to classify the grit in current concrete processing, the grit after will sieving through loading attachment again is the material loading one by one, need adopt two sets of devices, and the grit after the screening need be transported, takes trouble hard. Therefore, a device capable of grading and feeding sand is needed to meet the requirement of concrete processing.

Disclosure of Invention

In order to solve the defects in the prior art, the invention aims to provide the grading feeding device for processing the concrete precast slab, the grading feeding device is arranged in the feeding hopper, sand and stones can be prevented from falling to one side to cause blockage in the feeding hopper, the sand and stones with larger particle sizes are screened step by step through the screening cylinder and the annular filter screen, the screening of the sand and stones with different particle sizes is realized, the cleaning brush can be attached to the annular filter screen through the switching of the spring rods, the annular filter screen is effectively cleaned by combining the brush and clear water, and meanwhile, the stable operation of the conveying belt is ensured through the buffer mechanism during discharging.

The purpose of the invention can be realized by the following technical scheme:

a grading feeding device for processing a concrete precast slab comprises a base, wherein a plurality of stand columns are fixedly arranged on the base, a two-layer platform is fixedly arranged at the tops of the stand columns, a feeding hopper is fixedly arranged in the middle of the top of the two-layer platform, a first conveying belt is arranged on the left side above the feeding hopper, a material equalizing mechanism is arranged inside the feeding hopper, the bottom of the feeding hopper is connected with the feeding end of a screening mechanism, the screening mechanism comprises a screening box, the screening box is fixedly arranged on the stand columns, a plurality of partition plates are vertically arranged inside the screening box, the partition plates divide the inside of the screening box into a plurality of screening chambers, a screening barrel is horizontally arranged inside the screening box in a penetrating manner, the screening barrel is rotatably connected with the screening box and the partition plates, one end of the screening barrel is provided with a feeding port, the other end of the screening barrel is meshed with an output, screening chamber bottom is equipped with the discharge gate, and the clean mechanism of screening case outer wall fixed mounting is equipped with the second conveyer belt below the screening case, and the second conveyer belt corresponds discharge gate department and is equipped with buffer gear.

Further preferably, the first conveyor belt is horizontally and fixedly installed on the second-layer platform, the first conveyor belt is driven by a second motor, the second motor is fixedly installed on the surface of the second-layer platform, and the discharge end of the first conveyor belt is arranged right above the material homogenizing mechanism.

Further preferably, the material homogenizing mechanism comprises a triangular table, the material containing grooves are symmetrically formed in the two sides of the top of the triangular table, the rotating shaft is fixedly installed in the middle of the bottom of the triangular table, the two ends of the rotating shaft are rotatably connected with the inner wall of the feeding hopper, the stop levers are symmetrically arranged on the two sides below the rotating shaft and are parallel to the rotating shaft, and the stop levers are fixedly connected with the inner wall of the two ends of the feeding hopper.

Further preferably, the screening cylinder is round platform form, and the screening cylinder is close to feed inlet one end radius and is less than the other end, and the aperture of annular filter screen increases to the other end along the screening cylinder is close to feed inlet one end in proper order.

Further preferably, clean mechanism includes the box body, box body fixed mounting screening case outer wall, and the inside top level of box body runs through and is equipped with the inlet tube, a plurality of clean subassemblies of box body bottom fixed mounting, the position and the annular filter screen one-to-one of clean subassembly, and the inlet tube passes through the elasticity pipe and is connected with clean subassembly.

Further preferably, the cleaning assembly comprises a push rod, one end of the push rod is fixedly provided with a cleaning brush, the other end of the push rod is fixedly provided with a handle, the bottom of the push rod is connected with a slide rail in a sliding manner, the slide rail is fixedly arranged at the bottom of the box body, two sides of the push rod are hinged with spring rods, the other end of the spring rods is hinged with a side plate, and the side plate is fixedly arranged at the bottom of the box body at;

a plurality of water jet nozzles are arranged on the surface of the cleaning brush, a water inlet pipeline is arranged inside the push rod, a water inlet is arranged on the surface of the push rod, and the water inlet is connected with a water inlet pipe through an elastic pipe.

Further preferably, the spring rod includes head rod and second connecting rod, and the head rod includes end and inserted bar, and the second connecting rod includes end and loop bar, and the end of head rod is articulated with the push rod, and the inserted bar of head rod cup joints with the loop bar of second connecting rod, and the end and the curb plate of second connecting rod are articulated, through first spring coupling between the end of head rod and second connecting rod.

Further preferably, the second conveyor belt is horizontally and fixedly installed on the base, the second conveyor belt is driven by a third motor, the third motor is fixedly installed on the base, supporting plates are fixedly installed on the stand columns on two sides of the second conveyor belt, and the buffer mechanisms are fixedly installed on the supporting plates.

Further preferably, buffer gear includes the buffer roll, and the backup pad corresponds the vertical spout of having seted up of buffer roll department, is equipped with the slider in the spout, and buffer roll luminance rotates with the slider to be connected, slider bottom and spout sliding connection, and the slider bottom is connected with the spout through the second spring.

Further preferably, a fence is fixedly arranged on the edge of the upper surface of the second-layer platform on the right side of the feed hopper, and a staircase is fixedly arranged between the second-layer platform and the base.

The invention has the beneficial effects that:

the sand and stone conveyor is conveyed to the feed hopper through the first conveyor belt, and sand and stone fall into the feed hopper after being separated by the material homogenizing mechanism after falling from the first conveyor belt, so that the blockage in the feed hopper caused by the falling of the sand and stone towards one side can be prevented.

The sand and stone screening machine comprises a feeding hopper, a screening cylinder, a first motor, a second motor, a feeding hole, a second motor, a third motor, a fourth motor, a fifth motor, a sixth motor, a fifth motor, a sixth motor, a fifth.

The screened sand and stone are collected at the bottom of each screening chamber, and then the sand and stone fall from the discharge port and impact the second conveyor belt after being discharged from the bottom of different screening chambers according to the concrete grading and feeding sequence, so that the buffer roller can effectively buffer the conveyor belt and prevent the deformation of the conveyor belt caused by the overlarge impact on the second conveyor belt.

According to the invention, the cleaning mechanism is fixedly arranged on the side wall of the screening box, the push rod is controlled to move along the slide rail by pushing the handle, when the filter screen needs to be cleaned, the handle is pushed into the screening box to enable the cleaning brush to be attached to the filter screen, on one hand, the filter screen is cleaned by the cleaning brush, and on the other hand, the cleaning brush can spray cleaning water to wash the filter screen through the water spray nozzles on the surface; when the cleaning brush is not required to be pulled out in time, the handle can be pulled out to separate the cleaning brush from the filter screen, and the spring rod can enable the push rod to be positioned and switched at two positions.

Drawings

The invention will be further described with reference to the accompanying drawings.

FIG. 1 is a front view of a stepped loading apparatus for processing a concrete slab according to the present invention;

FIG. 2 is a left side view of the grading and feeding device for processing the concrete panels according to the present invention;

FIG. 3 is a right side view of the stepped loading apparatus for concrete slab processing according to the present invention;

FIG. 4 is a plan view of a stepped loading apparatus for processing a concrete slab according to the present invention;

FIG. 5 is a schematic view showing the overall construction of a stepped loading apparatus for concrete slab processing according to the present invention;

FIG. 6 is a sectional view of a hopper of a stepped loading apparatus for processing a concrete slab according to the present invention;

FIG. 7 is a sectional view of a screen box of the grading feeding device for processing a concrete slab according to the present invention;

FIG. 8 is a schematic structural view of a second conveyor belt of the stepped loading device for processing concrete panels according to the present invention;

FIG. 9 is a schematic structural view of a buffer mechanism of the grading feeding device for processing the concrete precast slab according to the present invention;

FIG. 10 is a sectional view of a case of the stepped loading apparatus for processing a concrete precast slab according to the present invention;

FIG. 11 is a schematic structural view of a cleaning assembly of a graded feeding device for processing a concrete slab according to the present invention;

FIG. 12 is a schematic view showing the construction of a spring bar of a stepped loading device for processing a concrete slab according to the present invention.

In the figure:

1-base, 2-column, 3-two-layer platform, 4-feed hopper, 5-first conveyor belt, 6-fence, 7-staircase, 8-material homogenizing mechanism, 9-screening mechanism, 10-screening box, 11-partition board, 12-screening chamber, 13-screening cylinder, 14-feed inlet, 15-first motor, 16-ring filter screen, 17-discharge outlet, 18-cleaning mechanism, 19-second conveyor belt, 20-buffer mechanism, 21-second motor, 22-triangular table, 23-material containing groove, 24-rotating shaft, 25-baffle rod, 26-box body, 27-water inlet pipe, 28-cleaning component, 29-elastic pipe, 30-push rod, 31-cleaning brush and 32-handle, 33-sliding rail, 34-spring rod, 341-first connecting rod, 342-second connecting rod, 343-first spring, 35-side plate, 36-third motor, 37-supporting plate, 38-buffer roller, 39-sliding groove, 40-sliding block and 41-second spring.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "opening," "upper," "lower," "thickness," "top," "middle," "length," "inner," "peripheral," and the like are used in an orientation or positional relationship that is merely for convenience in describing and simplifying the description, and do not indicate or imply that the referenced component or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present invention.

As shown in figures 1-11, a grading feeding device for processing concrete precast slabs comprises a base 1, a plurality of upright posts 2 are fixedly installed on the base 1, a second-layer platform 3 is fixedly installed on the tops of the upright posts 2, a feeding hopper 4 is fixedly installed in the middle of the top of the second-layer platform 3, a first conveyor belt 5 is arranged on the left side above the feeding hopper 4, a material equalizing mechanism 8 is arranged inside the feeding hopper 4, the bottom of the feeding hopper 4 is connected with the feeding end of a screening mechanism 9, the screening mechanism 9 comprises a screening box 10, the screening box 10 is fixedly installed on the upright posts 2, a plurality of partition plates 11 are vertically arranged inside the screening box 10, the inside of the screening box 10 is divided into a plurality of screening chambers 12 by the partition plates 11, a screening cylinder 13 is horizontally arranged in the screening box 10 in a penetrating manner, the screening cylinder 13 is rotatably connected with the screening box 10 and the partition plates 11, one end of the screening cylinder, first motor 15 fixed mounting all is equipped with annular filter screen 16 at screening case 10 outer wall, screening cylinder 13 surface to using each screening chamber 12 department, and screening chamber 12 bottom is equipped with discharge gate 17, and the clean mechanism 18 of screening case 10 outer wall fixed mounting is equipped with second conveyer belt 19 below the screening case 10, and second conveyer belt 19 corresponds discharge gate 17 department and is equipped with buffer gear 20.

The first conveyor belt 5 is horizontally and fixedly installed on the second-layer platform 3, the first conveyor belt 5 is driven by the second motor 21, the second motor 21 is fixedly installed on the surface of the second-layer platform 3, and the discharge end of the first conveyor belt 5 is arranged right above the material homogenizing mechanism 8.

As shown in fig. 5, the material homogenizing mechanism 8 comprises a triangular table 22, material containing grooves 23 are symmetrically formed in two sides of the top of the triangular table 22, a rotating shaft 24 is fixedly mounted in the middle of the bottom of the triangular table 22, two ends of the rotating shaft 24 are rotatably connected with the inner wall of the feeding hopper 4, stop rods 25 are symmetrically arranged on two sides below the rotating shaft 24, the stop rods 25 are parallel to the rotating shaft 24, and the stop rods 25 are fixedly connected with the inner walls of two ends of the feeding hopper 4. The grit is carried to feeder hopper 4 top through first conveyer belt 5 and is fallen down, the grit can make triangular platform 22 to this side slope after the gathering in the flourishing silo 23 of one side after falling into triangular platform 22, thereby pour into feeder hopper 4 with grit therein, the flourishing silo 23 of the in-process opposite side that topples over at the grit is collected the grit, the contained silo 23 of one side is toppled over completion back triangular platform 22 and is leaned towards the opposite side again, thereby realize toppling over the grit to feeder hopper 4 both sides, can prevent that the grit from leading to the jam in the feeder hopper towards one side fall down.

As shown in fig. 6, the screen cylinder 13 is in the shape of a circular truncated cone, the radius of one end of the screen cylinder 13 close to the feed port 14 is smaller than that of the other end, and the aperture of the annular screen 16 increases in sequence from one end of the screen cylinder 13 close to the feed port 14 to the other end. The circular truncated cone-shaped screening cylinder 13 can ensure that the sand and stone are conveyed to the other side along the feeding hole 14 after entering the screening cylinder 13, the sand and stone with smaller particle size can be firstly screened out by the different aperture of the annular filter screen 16, and then the sand and stone with larger particle size can be screened out step by step, thereby realizing the screening of the sand and stone with different particle size.

As shown in fig. 10, the cleaning mechanism 18 includes a box 26, the box 26 is fixedly installed on the outer wall of the screening box 10, a water inlet pipe 27 is horizontally arranged above the inside of the box 26, a plurality of cleaning assemblies 28 are fixedly installed at the bottom of the box 26, the positions of the cleaning assemblies 28 correspond to the annular filter screens 16 one by one, and the water inlet pipe 27 is connected with the cleaning assemblies 28 through an elastic pipe 29.

As shown in fig. 11, the cleaning assembly 28 includes a push rod 30, a cleaning brush 31 is fixedly mounted at one end of the push rod 30, a handle 32 is fixedly mounted at the other end of the push rod 30, the bottom of the push rod 30 is slidably connected with a slide rail 33, the slide rail 33 is fixedly mounted at the bottom of the box body 26, two sides of the push rod 30 are hinged with a spring rod 34, the other end of the spring rod 34 is hinged with a side plate 35, and the side plate 35 is fixedly mounted at the bottom of the box body 26 at two; the surface of the cleaning brush 31 is provided with a plurality of water spray nozzles, the push rod 30 is internally provided with a water inlet pipeline, the surface of the push rod 30 is provided with a water inlet, and the water inlet is connected with the water inlet pipe 27 through an elastic pipe 29.

As shown in fig. 12, the spring rod 34 includes a first connection rod 341 and a second connection rod 342, the first connection rod 341 includes a head and an insertion rod, the second connection rod 342 includes a head and a sleeve rod, the head of the first connection rod 341 is hinged to the push rod 30, the insertion rod of the first connection rod 341 is sleeved to the sleeve rod of the second connection rod 342, the head of the second connection rod 342 is hinged to the side plate 35, and the heads of the first connection rod 341 and the second connection rod 342 are connected by a first spring 343.

The control push rod 30 moves along the slide rail 33 by pushing the handle 32, when the annular filter screen 16 needs to be cleaned, the handle is pushed into the screening box 10 to enable the cleaning brush 31 to be attached to the annular filter screen 16, on one hand, the cleaning brush 31 cleans the annular filter screen 16 through bristles, and on the other hand, water spray nozzles on the surface can spray cleaning water to wash the filter screen; when the handle 32 can be pulled outwards to separate the cleaning brush 31 from the annular filter screen 16 without any need, the spring rod 34 can enable the push rod 30 to be positioned and switched at two positions.

As shown in fig. 8 and 9, the second conveyor belt 19 is horizontally and fixedly mounted on the base 1, the second conveyor belt 19 is driven by a third motor 36, the third motor 36 is fixedly mounted on the base 1, support plates 37 are fixedly mounted on the columns on both sides of the second conveyor belt 19, and the buffer mechanism 20 is fixedly mounted on the support plates 37. The buffer mechanism 20 comprises a buffer roller 38, a sliding groove 39 is vertically formed in the supporting plate 37 corresponding to the buffer roller 38, a sliding block 40 is arranged in the sliding groove 39, the brightness of the buffer roller 38 is rotatably connected with the sliding block 40, the bottom of the sliding block 40 is slidably connected with the sliding groove 39, and the bottom of the sliding block 40 is connected with the sliding groove 39 through a second spring 41.

The sand and stone can impact the second conveyor belt 19 after falling from the discharge port 17, and the buffer roller 38 can effectively buffer the second conveyor belt 19, so that the second conveyor belt 19 is prevented from being deformed due to overlarge impact.

The fence 6 is fixedly arranged on the edge of the upper surface of the second-layer platform 3 on the right side of the feed hopper 4, and the staircase 7 is fixedly arranged between the second-layer platform 3 and the base 1.

When the device is used for grading feeding, mixed sand and stones are conveyed to a feed hopper 4 through a first conveyor belt 5, the sand and stones fall from the first conveyor belt 5 and then fall into the feed hopper 4 after being divided by a material equalizing mechanism 8, the sand and stones can be prevented from falling to one side to cause blockage in the feed hopper 4, the sand and stones enter a screening cylinder 13 from the feed hopper 4 and then are driven to rotate by a first motor 15, the screening cylinder 13 is in a circular table shape, the sand and stones enter the screening cylinder 13 and then are conveyed to the other side along a feed inlet 14, the sand and stones with smaller particle sizes can be screened out by annular filter screens 16 with different pore diameters, then the sand and stones with larger particle sizes are screened out step by step, the screening of the sand and stones with different particle sizes is realized, the screened sand and stones are collected at the bottoms of various screening chambers 12, then discharge materials 17 at the bottoms of different screening chambers 12 are selected according to the concrete grading and feeding sequence, the sand and stones fall from a discharge, the buffer roller 38 can effectively buffer the second conveyor belt 19, so as to prevent the second conveyor belt 19 from being deformed due to too large impact, and finally, the screened sand is conveyed to the stirring and mixing equipment through the second conveyor belt 19.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.