CN114602626A - Recycled concrete production system and process thereof - Google Patents

Abstract

The invention discloses a recycled concrete production system which comprises a bottom plate, wherein the top of the bottom plate is sequentially provided with a vibrating screening part, a stirring part, a feeding part and a crushing part from left to right; the vibration screening part consists of a stable rotating mechanism, a vibration buffering mechanism and a screening mechanism; the feeding part comprises a first screw feeder, a second screw feeder and a telescopic moving mechanism, and the front side and the rear side of the first screw feeder are fixedly connected with second supporting columns; the crushed aggregates part is by the coarse fodder rubbing crusher, first guide fill, thin material grinding mill, second guide fill and the bent pipeline of water conservancy diversion that from the top down set gradually and constitutes, and the one end of bent pipeline of water conservancy diversion is linked together with the bottom output of second guide fill, and the bin outlet has been seted up to the bottom of first guide fill. The invention is convenient for recycling the concrete slag blocks and obtaining the recycled concrete through processing and production, reduces the waste of raw materials used for manufacturing the concrete and greatly reduces the cost.

Description

Recycled concrete production system and process thereof

Technical Field

The invention relates to the technical field of recycled concrete production, in particular to a recycled concrete production system and a process thereof.

Background

Concrete, referred to as "concrete" for short: refers to the general name of engineering composite materials formed by cementing aggregate into a whole by cementing materials. The term concrete generally refers to cement as the cementing material and sand and stone as the aggregate; the cement concrete, also called as common concrete, is obtained by mixing with water (which may contain additives and admixtures) according to a certain proportion and stirring, and is widely applied to civil engineering.

At present, when concrete is used in a building construction site, a large amount of concrete overflowing easily can be generated, the concrete overflowing can be solidified into concrete slag blocks with different sizes, when the concrete is subsequently cleaned in the building construction site, the concrete slag blocks are usually buried or directly discarded as building garbage, so that waste can be caused to raw materials for manufacturing the concrete, the raw materials cannot be recycled, and the cost is greatly increased.

Disclosure of Invention

The invention aims to overcome the problems in the prior art, and provides a recycled concrete production system and a process thereof, which are convenient for recycling concrete slag blocks and obtaining recycled concrete through processing production, reduce the waste of raw materials for manufacturing concrete and greatly reduce the cost.

In order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme:

a recycled concrete production system comprises a bottom plate, wherein a vibrating screening part, a stirring part, a feeding part and a crushing part are sequentially arranged on the top of the bottom plate from left to right;

the vibration screening part consists of a stable rotating mechanism, a vibration buffering mechanism and a screening mechanism;

the feeding part comprises a first screw feeder, a second screw feeder and a telescopic moving mechanism, and second supporting columns are fixedly connected to the front side and the rear side of the first screw feeder;

the crushed aggregates part comprises coarse fodder rubbing crusher, first guide fill, thin material grinding mill, second guide fill and the water conservancy diversion pipeline that from the top down set gradually, the one end of water conservancy diversion pipeline is linked together with the bottom output of second guide fill, the bin outlet has been seted up to the bottom of first guide fill, coarse fodder rubbing crusher and thin material grinding mill all through supporting rack fixed mounting on the bottom plate.

Preferably, the first screw feeder and the second screw feeder are both composed of a feeding barrel, a feeding screw, a feeding port, a discharging port, a secondary bevel gear, a barrel cover, a short shaft, a main bevel gear and a feeding motor, the cylinder cover is fixedly connected with the top of the feeding cylinder, the short shaft is rotationally connected with the inner cavity of the cylinder cover, the feeding motor is positioned beside the cylinder cover, the power output end of the feeding motor is connected with the short shaft, the feeding hole is arranged at the bottom end of the outer wall of the feeding barrel, the main bevel gear is fixedly connected on the short shaft, the discharge port is arranged at the top end of the outer wall of the feeding barrel, the feeding screw is rotatably connected in the inner cavity of the feeding barrel, the feeding screw extends into the inner cavity of the cylinder cover, the secondary bevel gear is fixedly connected with one end of the feeding screw extending into the inner cavity of the cylinder cover, and the secondary bevel gear is meshed with the main bevel gear, and the other end of the flow guide bent pipeline is communicated with an inner cavity of a feeding barrel in the first screw feeder through a feeding hole in the first screw feeder.

Based on the technical characteristics, the crushed aggregates conveyed into the flow guide bent pipeline are conveyed into the first screw feeder conveniently, so that the crushed aggregates are conveyed from bottom to top through the first screw feeder conveniently.

Preferably, flexible moving mechanism includes cover seat and backup pad, the cover seat slides and cup joints on the outer wall of second screw feeder, the backup pad rigid coupling is on the outer wall of second screw feeder, the upper and lower both sides of cover seat all are provided with hydraulic push rod, hydraulic push rod's the flexible end of power and backup pad looks rigid coupling, the equal rigid coupling in both sides has first support column around the cover seat, the bottom of first support column and second support column all with bottom plate looks rigid coupling.

Based on the technical characteristics, the first screw feeder and the second screw feeder are conveniently and stably supported on the bottom plate.

Preferably, stabilize rotary mechanism and include prismatic, prismatic outer wall rigid coupling has the disc seat, prismatic is connected with the steadying frame through the rotation of disc seat, and the bottom plate looks rigid coupling of steadying frame, the inner chamber bottom of steadying frame is provided with first positive and negative motor that rotates, the power take off end of first positive and negative motor is connected with the reduction gear, the power take off end of reduction gear and prismatic bottom rigid coupling.

Based on above-mentioned technical characteristics, the positive and negative rotation through first positive and negative motor provides drive power, then is convenient for drive prismatic and carry out stable rotation regulation on the steady rest under the effect of reduction gear.

Preferably, vibration buffer gear includes buffer spring, roof, two sets of logical grooves of stepping down and four group's direction telescopic links, the roof rigid coupling is at prismatic top, buffer spring cup joints on prism, buffer spring's the front and back both sides all are provided with supporting motor, and are two sets of supporting motor is respectively through frame fixed mounting at the top of steady rest, and is two sets of the equal rigid coupling of right side power output end of supporting motor has the cam, and is two sets of the logical groove of stepping down is seted up respectively in the top front and back both sides of steady rest, the logical groove of stepping down is corresponding with the cam one-to-one, four groups the direction telescopic link corresponds the distribution in prismatic front and back four sides, and the top and the roof looks rigid coupling of direction telescopic link.

Based on above-mentioned technical characteristics, dodge when logical groove rotates the cam through stepping down to be convenient for support motor drives the cam and rotates and reciprocate the regulation to screening mechanism, and then be convenient for carry out the vibration regulation of making a round trip from top to bottom to it.

Preferably, screening mechanism includes the feed cylinder, first screw feeder and second screw feeder distribute peripherally at the circumference of feed cylinder, the outer wall of feed cylinder rotates there is the loading board, the loading board slides and cup joints on the prism, the loading board is located between direction telescopic link and the buffer spring, the top of loading board and the flexible end rigid coupling in bottom of direction telescopic link, the outer wall rigid coupling of feed cylinder has the ring spur gear, the ring spur gear is located the below of loading board, the bottom fixed mounting of loading board has the positive reverse motor of second, the positive reverse motor's of second bottom power take off end is connected with main spur gear, main spur gear meshes with the ring spur gear mutually.

Based on above-mentioned technical characteristics, be convenient for when the second is just reversing the motor and is providing just reversing drive power, drive the feed cylinder and carry out clockwise and anticlockwise rotation regulation on the loading board.

Preferably, the bottom of feed cylinder is provided with the screening bottom plate, the right-hand member and the feed cylinder of screening bottom plate change over mutually, both sides all are provided with slope hydraulic telescoping rod around the feed cylinder, slope hydraulic telescoping rod is located the below of ring straight-teeth gear, between slope hydraulic telescoping rod's the top and the feed cylinder slope hydraulic telescoping rod's the flexible end of bottom power and screening bottom plate between all rotate and be connected, the screening net is installed to the top gomphosis of screening bottom plate, the external diameter of screening net is greater than the internal diameter of feed cylinder, the screening net is coarse fodder screening net or is fine material screening net.

Based on above-mentioned technical characteristics, when rotating the closure bottom the feed cylinder through the screening bottom plate, be convenient for press from both sides tight fixedly screening net between screening bottom plate and feed cylinder to make the screening net not drunkenness when the feed cylinder of being convenient for rotates.

Preferably, the stirring part is a stirrer, and the stirrer is positioned below the barrel.

Based on above-mentioned technical characteristics, be convenient for receive the crushed aggregates that the feed cylinder sieved off.

Preferably, flexible retaining bodies are fixedly connected to the front side and the rear side of the bottom end of the outer wall of the second screw feeder.

Based on above-mentioned technical characteristics, feed inlet and bin outlet on the second screw feeder are linked together, and the crushed aggregates in the first guide hopper carries out sheltering from and the water conservancy diversion of side through flexible fender material body when the bin outlet is carried to the feed inlet for fully enter into in the feed inlet when the crushed aggregates is discharged from the bin outlet.

A recycled concrete production process is used for the recycled concrete production process and comprises the following specific steps:

1) when a crushed material of coarse particles is required

S100: the screening net is installed for the coarse material screening net:

s101: the supporting motor works to drive the cam to rotate, the protruding end of the cam extends into the yielding through groove, and the supporting motor stops working;

s102: the prism is driven to rotate on the stabilizing frame through the work of the first forward and reverse rotating motor, the screening mechanism is transferred forwards and is moved away from the upper part of the stirring part;

s103: the screening bottom plate is driven to rotate and open at the bottom of the charging barrel through the extension of the inclined hydraulic telescopic rod, at the moment, the screening net is selected as a coarse material screening net, then the coarse material screening net is embedded and replaced on the screening bottom plate, the screening bottom plate is driven to rotate and close at the bottom of the charging barrel through the contraction of the inclined hydraulic telescopic rod, and the fixed installation between the charging barrel and the screening bottom plate when the screening net is the coarse material screening net is completed;

s104: starting a first forward and reverse rotation motor, rotating in a direction opposite to that of the first forward and reverse rotation motor in the step S102, and moving the screening mechanism to the position above the stirring part for resetting;

s200: and (3) crushing the concrete slag blocks: feeding the concrete slag blocks into a coarse material crusher through an excavator, crushing the concrete slag blocks through the operation of the coarse material crusher, discharging crushed slag blocks formed by crushing from the bottom of the coarse material crusher, falling into a first guide hopper, then discharging from a discharge port and inputting into the bottom end of a second screw feeder;

s300: conveying the crushed slag blocks: conveying the crushed slag lump material from the bottom end to the upper end through the operation of a second screw feeder, and finally discharging the crushed slag lump material from a discharge hole on the second screw feeder to fall into a charging barrel;

s400: preparing coarse particle crushed aggregates:

s401: the supporting motor continuously drives the cam to rotate, the bearing plate slides up and down back and forth on the prism, and the screening mechanism is further driven to vibrate up and down back and forth;

s402: meanwhile, the main straight gear is driven to rotate through the forward rotation of the second forward and reverse rotation motor, the charging barrel is driven to rotate back and forth on the bearing plate clockwise and anticlockwise through the meshing transmission of the main straight gear and the annular straight gear, and crushed slag blocks falling into the charging barrel are screened through the coarse material screening net;

s500: production of recycled concrete: the screened coarse particle crushed aggregates fall into a stirrer, cement, sand, stone and water are added into the stirrer to be matched according to a certain proportion, and the mixture is stirred to obtain recycled concrete with the raw materials of the coarse particle crushed aggregates, so that concrete slag blocks on a building construction site are reused;

2) when small pieces of fine particles are required

S600: the screening net is installed for a fine material screening net:

s601: the supporting motor works to drive the cam to rotate, the protruding end of the cam extends into the yielding through groove, and the supporting motor stops working;

s602: the prism is driven to rotate on the stabilizing frame through the work of the first forward and reverse rotating motor, the screening mechanism is transferred forwards and is moved away from the upper part of the stirring part;

s603: the screening bottom plate is driven to rotate and open at the bottom of the charging barrel by extending the inclined hydraulic telescopic rod, and at the moment, the raw materials which are remained in the screening crushed slag block materials in the charging barrel and are not completely crushed into coarse particle crushed materials are discharged;

s604: then taking the coarse material screening net off the screening bottom plate, selecting the screening net as a fine material screening net, embedding and replacing the fine material screening net on the screening bottom plate, and driving the screening bottom plate to rotate and close at the bottom of the charging barrel through contraction of the inclined hydraulic telescopic rod to finish the fixed installation between the charging barrel and the screening bottom plate when the screening net is the fine material screening net;

s605: starting a first forward and reverse rotation motor, rotating in a direction opposite to that of the first forward and reverse rotation motor in the step S602, and moving the screening mechanism to the position above the stirring part for resetting;

s700: and (3) crushing the concrete slag blocks:

s701: the supporting plate is pushed by the extension of the hydraulic push rod, and then the second screw feeder is pushed upwards in the sleeve seat to move, so that the feeding port and the discharging port on the second screw feeder are separated in a staggered manner;

s702: feeding the concrete slag blocks by an excavator, putting the concrete slag blocks into a coarse material crusher, crushing the concrete slag blocks by the operation of the coarse material crusher, discharging crushed slag blocks formed by crushing from the bottom of the coarse material crusher, falling into a first material guide hopper, then discharging from a discharge port, falling into a fine material grinding mill, and fully grinding the crushed slag blocks by the fine material grinding mill;

s800: conveying of ground material: the ground material is discharged from the bottom of the fine material grinding mill, falls into a second guide hopper, is discharged from the bottom of the second guide hopper, is conveyed into a flow guide bent pipeline, is conveyed to the bottom end of a first screw feeder through the flow guide bent pipeline in a flow guide mode, is conveyed to the upper end of the first screw feeder from the bottom end through the operation of the first screw feeder, is finally discharged from a discharge port on the first screw feeder, and falls into a charging barrel;

s900: preparing fine particle crushed aggregates: repeating the actions of the step S401 and the step S402, and screening the ground materials falling into the charging barrel through a fine material screening net;

s1000: production of recycled concrete: and finally, adding cement, sand, stone and water into the mixer to be matched according to a certain proportion, and stirring to obtain the recycled concrete with the raw material being the fine particle crushed aggregates, so that the concrete slag blocks on the building construction site are reused.

Compared with the prior art, the invention has the following beneficial effects:

firstly, the method comprises the following steps: the crushing part is convenient for crush and grind the concrete slag blocks, so that raw materials with different thicknesses are obtained, and the raw materials with different thicknesses are convenient to be separately conveyed through the cooperation of the second screw feeder, the first screw feeder, the telescopic moving mechanism and the flow guide bent pipeline.

Secondly, the method comprises the following steps: through slope hydraulic telescoping rod's flexible regulation, through the normal running fit of screening bottom plate and feed cylinder, through the gomphosis installation effect between screening net and the screening bottom plate, be convenient for change the screening net of different grade type, improve the functional of this system, also be convenient for simultaneously discharge the remaining raw materials after screening in the feed cylinder, be convenient for reprocess use again with.

Thirdly, the method comprises the following steps: through the cooperation of vibration buffer gear, the positive reverse motor of second, main straight-teeth gear and ring straight-teeth gear to and the normal running fit between feed cylinder and the loading board, also can carry out the vibration of making a round trip from top to bottom when being convenient for carry out clockwise and anticlockwise round trip rotation to the feed cylinder, avoid the raw materials to pile up in the feed cylinder, make the screening net screening more abundant, improve the screening effect of screening net.

In conclusion, the recycled concrete production system is reasonable in design, recycled concrete can be obtained by recycling concrete slag blocks and processing the recycled concrete, recycled concrete of raw materials with different thicknesses can be obtained, waste of raw materials used for manufacturing concrete is reduced, cost is greatly reduced, and the recycled concrete production system is convenient to use and popularize.

Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a use state of the present invention;

FIG. 2 is a schematic structural view of a scrap portion of the present invention;

FIG. 3 is a schematic structural view of a second screw feeder of the present invention;

FIG. 4 is a schematic structural diagram of the telescopic moving mechanism of the present invention;

FIG. 5 is a schematic illustration of the configuration of the vibratory screening portion of the present invention;

FIG. 6 is a schematic view of the connection between the sieving base plate and the sieving net of the present invention;

FIG. 7 is a schematic structural view of a screening deck of the present invention;

in the drawings, the components represented by the respective reference numerals are listed below:

100-bottom plate, 200-crushed material part, 201-coarse material crusher, 202-first guide hopper, 203-fine material grinder, 204-second guide hopper, 205-diversion curved pipeline, 206-discharge port, 300-feeding part, 301-first screw feeder, 302-second screw feeder, 3021-feeding barrel, 3022-feeding screw, 3023-feeding port, 3024-discharge port, 3025-slave bevel gear, 3026-barrel cover, 3027-short shaft, 3028-main bevel gear, 3029-feeding motor, 303-telescopic moving mechanism, 3031-sleeve seat, 3032-support plate, 3033-support column, 3034-hydraulic push rod, 400-vibration screening part, 401-stable rotating mechanism, 4011-first forward and reverse rotating motor, 4012-speed reducer, 4013-prism, 4014-stabilizer, 4015-disc seat, 402-vibration buffer mechanism, 4021-buffer spring, 4022-support motor, 4023-base, 4024-cam, 4025-abdicating through groove, 4026-top plate, 4027-guiding telescopic rod, 403-screening mechanism, 4031-second positive and negative rotation motor, 4032-main spur gear, 4033-inclined hydraulic telescopic rod, 4034-screening bottom plate, 4035-ring spur gear, 4036-bearing plate, 4037-material cylinder, 4038-screening net and 500-stirring part.

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.

Example 1

A recycled concrete production system comprises a bottom plate 100, wherein the top of the bottom plate 100 is sequentially provided with a vibrating screening part 400, a stirring part 500, a feeding part 300 and a crushing part 200 from left to right (refer to figure 1 in the attached drawings of the specification);

the crushed material part 200 is composed of a coarse material crusher 201, a first material guide hopper 202, a fine material grinding mill 203, a second material guide hopper 204 and a flow guide bent pipeline 205 which are arranged from top to bottom in sequence, one end of the flow guide bent pipeline 205 is communicated with the bottom output end of the second material guide hopper 204, the bottom end of the first material guide hopper 202 is provided with a discharge port 206, and the coarse material crusher 201 and the fine material grinding mill 203 are both fixedly arranged on the bottom plate 100 through a support frame (refer to fig. 2 in the attached drawing of the specification);

the feeding part 300 comprises a first screw feeder 301, a second screw feeder 302 and a telescopic moving mechanism 303, wherein the front side and the rear side of the first screw feeder 301 are fixedly connected with second supporting columns (refer to fig. 1 in the attached drawings of the specification).

Example 2

Based on embodiment 1, the present invention provides another technical solution: a recycled concrete production system is characterized in that a first screw feeder 301 and a second screw feeder 302 are respectively composed of a feeding barrel 3021, a feeding screw 3022, a feeding port 3023, a discharging port 3024, a secondary bevel gear 3025, a barrel cover 3026, a short shaft 3027, a main bevel gear 3028 and a feeding motor 3029, the barrel cover 3026 is fixedly connected to the top of the feeding barrel 3021, the short shaft 3027 is rotatably connected to the inner cavity of the barrel cover 3026, the feeding motor 3029 is arranged beside the barrel cover 3026, the power output end of the feeding motor 3029 is connected to the short shaft 3027, the feeding port 3023 is arranged at the bottom end of the outer wall of the feeding barrel 3021, the main bevel gear 3028 is fixedly connected to the short shaft 3027, the discharging port 3024 is arranged at the top end of the outer wall of the feeding barrel 3021, the feeding screw 3022 is rotatably connected to the inner cavity of the feeding barrel 3021, the feeding screw 3022 extends into the inner cavity of the barrel cover 3026, the bevel gear 3025 is fixedly connected to one end of the feeding screw 3022 extending into the inner cavity of the feeding barrel 3026, the other end of the diversion curved pipeline 205 is communicated with the inner cavity of a feeding barrel 3021 in the first screw feeder 301 through a feeding hole 3023 on the first screw feeder 301, so that the crushed aggregates conveyed into the diversion curved pipeline 205 are conveyed into the first screw feeder 301, a short shaft 3027 is driven by a feeding motor 3029 to rotate on a barrel cover 3026, a main bevel gear 3028 is further driven to rotate, and a feeding screw 3022 is driven to rotate in the feeding barrel 3021 through meshing transmission of the main bevel gear 3028 and a secondary bevel gear 3025, so that the crushed aggregates are conveyed from bottom to top through the first screw feeder 301 and the second screw feeder 302 (see fig. 3 in the attached drawing of the specification);

flexible material blocking bodies (refer to fig. 1 in the attached drawing of the specification) are fixedly connected to the front side and the rear side of the bottom end of the outer wall of the second screw feeder 302, a feed port 3023 on the second screw feeder 302 is communicated with a discharge port 206, and when the crushed aggregates in the first material guide hopper 202 are conveyed to the feed port 3023 through the discharge port 206, the crushed aggregates are laterally blocked and guided by the flexible material blocking bodies, so that the crushed aggregates fully enter the feed port 3023 when being discharged from the discharge port 206;

the telescopic moving mechanism 303 comprises a sleeve seat 3031 and a support plate 3032, the sleeve seat 3031 is slidably sleeved on the outer wall of the second screw feeder 302, the support plate 3032 is fixedly connected to the outer wall of the second screw feeder 302, hydraulic push rods 3034 are respectively arranged on the upper side and the lower side of the sleeve seat 3031, the power telescopic end of the hydraulic push rod 3034 is fixedly connected with the support plate 3032, first support columns 3033 are fixedly connected to the front side and the rear side of the sleeve seat 3031, and the bottoms of the first support columns 3033 and the second support columns are fixedly connected with the base plate 100, so that the first screw feeder 301 and the second screw feeder 302 are stably supported on the base plate 100 (see fig. 4 in the attached drawings of the specification).

Example 3

Based on the embodiment 1 and the embodiment 2, the invention provides another technical scheme: a recycled concrete production system, a vibration screening part 400 is composed of a stable rotating mechanism 401, a vibration buffering mechanism 402 and a screening mechanism 403;

the stabilizing and rotating mechanism 401 comprises a prism 4013, a disc seat 4015 is fixedly connected to the outer wall of the prism 4013, the prism 4013 is rotatably connected with a stabilizing frame 4014 through the disc seat 4015, the bottom of the stabilizing frame 4014 is fixedly connected with the bottom plate 100, a first forward and reverse rotating motor 4011 is arranged at the bottom of an inner cavity of the stabilizing frame 4014, a power output end of the first forward and reverse rotating motor 4011 is connected with a speed reducer 4012, a power output end of the speed reducer 4012 is fixedly connected with the bottom of the prism 4013, driving force is provided through forward and reverse rotation of the first forward and reverse rotating motor 4011, and then the prism 4013 is conveniently driven to perform stable rotation adjustment on the stabilizing frame 4014 under the action of the speed reducer 4012;

the vibration buffering mechanism 402 comprises a buffering spring 4021, a top plate 4026, two sets of abdicating through grooves 4025 and four sets of guiding telescopic rods 4027, the top plate 4026 is fixedly connected to the top of a prism 4013, the buffering spring 4021 is sleeved on the prism 4013, the front side and the rear side of the buffering spring 4021 are respectively provided with a supporting motor 4022, the two sets of supporting motors 4022 are respectively fixedly arranged at the top of a stabilizing frame 4014 through a base 4023, the right power output ends of the two sets of supporting motors 4022 are respectively fixedly connected with a cam 4024, the two sets of abdicating through grooves 4025 are respectively arranged at the front side and the rear side of the top of the stabilizing frame 4014, the prism abdicating through grooves 4025 correspond to the cams 4024 one by one, the four sets of guiding telescopic rods 4027 are correspondingly distributed at the front side, the rear side, the left side and the right side of the 4013, the top of the guiding telescopic rods 4027 is fixedly connected with the top plate 4026, the abdicating through the through grooves 4025 to carry out when the cam 4025, thereby facilitating the supporting motor 4022 to drive the cam 4024 to rotate to carry out vertical movement adjustment on the sieving mechanism 403, thereby facilitating the up-and-down vibration adjustment of the vibration plate;

the sieving mechanism 403 comprises a material barrel 4037, the first screw feeder 301 and the second screw feeder 302 are distributed on the periphery of the material barrel 4037, the stirring part 500 is a stirring machine, the stirring machine is located below the material barrel 4037, and is convenient for receiving crushed materials sieved from the material barrel 4037 (see fig. 1 in the attached drawing of the specification), the outer wall of the material barrel 4037 rotates to form a bearing plate 4036, the bearing plate 4036 is slidably sleeved on a prism 4013, the bearing plate 4036 is located between a guiding telescopic rod 4027 and a buffer spring 4021, the top of the bearing plate 4036 is fixedly connected with the bottom telescopic end of the guiding telescopic rod 4027, the bearing plate 4036 is stably guided when sliding up and down on the prism 4013 by the extension and retraction of the guiding telescopic rod 4027, the outer wall of the material barrel 4037 is fixedly connected with a spur gear 4035, the ring gear 4035 is located below the bearing plate 4036, a second forward and reverse rotation motor 4031 is fixedly installed at the bottom of the bearing plate 4036, and a power output end of the bottom of the second forward and reverse rotation motor 4031 is connected with a main spur gear 4032, the main spur gear 4032 is meshed with the ring spur gear 4035, so that when a forward and reverse rotation driving force is provided by the second forward and reverse rotation motor 4031, the material cylinder 4037 is driven to rotate clockwise and counterclockwise on the bearing plate 4036, a screening bottom plate 4034 (see fig. 7 in the attached drawing of the specification) is arranged at the bottom of the material cylinder 4037, the right end of the screening bottom plate 4034 is connected with the material cylinder 4037 in a switching manner, inclined hydraulic telescopic rods 4033 are arranged on the front side and the rear side of the material cylinder 4037, the inclined hydraulic telescopic rods 4033 are located below the ring spur gear 4035, and the top end of the inclined hydraulic telescopic rods 4033 is connected with the material cylinder 4037 in a rotating manner, and the bottom power telescopic end of the inclined hydraulic telescopic rods 4033 is connected with the screening bottom plate 4034 in a rotating manner (see fig. 5 in the attached drawing of the specification);

a sieving net 4038 is installed on the top of the sieving bottom plate 4034 in an embedded mode, the sieving net 4038 is a coarse material sieving net or a fine material sieving net, the aperture of the coarse material sieving net is larger than that of the fine material sieving net, the outer diameter of the sieving net 4038 is larger than the inner diameter of the charging barrel 4037, and when the sieving bottom plate 4034 rotates and closes at the bottom of the charging barrel 4037, the sieving net 4038 can be clamped and fixed between the sieving bottom plate 4034 and the charging barrel 4037 conveniently, so that the sieving net 4038 does not move when the charging barrel 4037 rotates (see fig. 6 in the attached drawing of the specification).

A recycled concrete production process is used for the recycled concrete production process and comprises the following specific steps:

1) when a crushed material of coarse particles is required

S100: the screening net 4038 is used for installing a coarse material screening net:

s101: the supporting motor 4022 is started, the supporting motor 4022 works to drive the cam 4024 to rotate, the protruding end of the cam is extended into the abdicating through groove 4025, and the supporting motor 4022 stops working;

s102: starting a first forward and reverse rotating motor 4011, driving a prism 4013 to rotate on a stabilizing frame 4014 through a disc seat 4015 by the operation of the first forward and reverse rotating motor 4011, transferring a screening mechanism 403 forwards, removing the screening mechanism from the upper part of a stirring part 500, and then stopping the 4011;

s103: starting an inclined hydraulic telescopic rod 4033, extending the inclined hydraulic telescopic rod 4033 to drive a screening bottom plate 4034 to rotate and open at the bottom of a material cylinder 4037, observing and opening to a proper position, stopping the operation of the inclined hydraulic telescopic rod 4033, selecting a screening net 4038 as a coarse material screening net, embedding and replacing the coarse material screening net on the screening bottom plate 4034, starting the inclined hydraulic telescopic rod 4033, contracting the inclined hydraulic telescopic rod 4033 to drive the screening bottom plate 4034 to rotate and close at the bottom of the material cylinder 4037, and finally stopping the operation of the inclined hydraulic telescopic rod 4033, thereby finishing the fixed installation between the material cylinder 4037 and the screening bottom plate 4034 when the screening net 4038 is a coarse material screening net;

s104: starting the first forward and reverse rotating motor 4011, rotating in a direction opposite to the first forward and reverse rotating motor 4011 in the step S102, moving the sieving mechanism 403 above the stirring part 500 to reset, and then stopping the first forward and reverse rotating motor 4011;

s200: and (3) crushing the concrete slag blocks: starting the coarse material crusher 201, the second screw feeder 302, the supporting motor 4022 and the second forward and reverse rotating motor 4031, feeding the concrete slag blocks into the coarse material crusher 201 through the feeding of an excavator, crushing the concrete slag blocks through the operation of the coarse material crusher 201, discharging crushed slag blocks formed by crushing from the bottom of the coarse material crusher 201, enabling the crushed slag blocks to fall into the first material guide hopper 202, then discharging from the discharge port 206 and inputting to the bottom end of the second screw feeder 302;

s300: conveying the crushed slag blocks: the slag lump material is conveyed from the bottom end to the upper end by the operation of the second screw feeder 302, and finally discharged from a discharge port 3024 on the slag lump material and falls into the barrel 4037;

s400: preparing coarse particle crushed aggregates:

s401: the cam 4024 is driven to rotate by the operation of the supporting motor 4022, and when the convex end of the cam 4024 rotates upward, gradually slide up the prism 4013 against the carrier 4036 and squeeze the guiding telescopic rods 4027, causing it to contract, after the convex end of the cam 4024 rotates to the highest position, then the convex end of the cam 4024 will rotate downward, when the convex end of the cam 4024 rotates downwards, the bearing plate 4036 is driven by the self weight of the screening mechanism 403 to slide downwards on the prism 4013, and drives the guiding telescopic rods 4027 to extend downwards, when the bearing plate 4036 slides downwards on the prism 4013, the buffer spring 4021 is pressed, the support plate 4036 is buffered when sliding downwards by the elastic extension of the compressed buffer spring 4021, the support motor 4022 continuously drives the cam 4024 to rotate, the bearing plate 4036 slides up and down and back and forth on the prism 4013, and further drives the sieving mechanism 403 to vibrate up and down and back and forth;

s402: meanwhile, the main spur gear 4032 is driven to rotate by the forward rotation of the second forward and reverse rotation motor 4031, the charging barrel 4037 is driven to rotate back and forth on the bearing plate 4036 clockwise and counterclockwise by the meshing transmission of the main spur gear 4032 and the ring spur gear 4035, and the crushed slag lump material falling into the charging barrel 4037 is screened through a coarse material screening net;

s500: production of recycled concrete: the coarse particle crushed aggregates screened out fall into the stirring machine, cement, sand, stone and water are added into the stirring machine to be matched according to a certain proportion, and the recycled concrete with the raw materials being the coarse particle crushed aggregates is obtained through stirring, so that the concrete slag blocks on the building construction site are reused.

2) When small pieces of fine particles are required

S600: the screening net 4038 is used for installing a fine material screening net:

s601: the supporting motor 4022 is started, the supporting motor 4022 works to drive the cam 4024 to rotate, the protruding end of the cam is extended into the abdicating through groove 4025, and the supporting motor 4022 stops working;

s602: starting a first forward and reverse rotating motor 4011, driving a prism 4013 to rotate on a stabilizing frame 4014 through a disc seat 4015 by the operation of the first forward and reverse rotating motor 4011, transferring a screening mechanism 403 forwards, removing the screening mechanism from the upper part of a stirring part 500, and then stopping the 4011;

s603: starting the inclined hydraulic telescopic rod 4033, extending the inclined hydraulic telescopic rod 4033 to drive the screening bottom plate 4034 to rotate and open at the bottom of the charging barrel 4037, observing and opening to a proper position, and stopping the operation of the inclined hydraulic telescopic rod 4033, at the moment, discharging the raw material which is remained in the screened slag lump material in the charging barrel 4037 and is not completely crushed into coarse-particle crushed material, and loading the raw material by using a box body, so that the raw material is convenient to be repeatedly crushed and reused subsequently;

s604: then taking the coarse material screening net down from the screening bottom plate 4034, selecting the screening net 4038 as a fine material screening net, then embedding and replacing the fine material screening net on the screening bottom plate 4034, starting the inclined hydraulic telescopic rod 4033, driving the screening bottom plate 4034 to rotate and close at the bottom of the charging barrel 4037 through contraction of the inclined hydraulic telescopic rod 4033, and finally stopping the operation of the inclined hydraulic telescopic rod 4033 to finish the fixed installation between the charging barrel 4037 and the screening bottom plate 4034 when the screening net 4038 is the fine material screening net;

s605: starting a first forward and reverse rotation motor 4011, rotating in a direction opposite to the first forward and reverse rotation motor 4011 in the step S602, moving the screening mechanism 403 to a position above the stirring part 500 for resetting, and then stopping the first forward and reverse rotation motor 4011;

s700: and (3) crushing the concrete slag blocks:

s701: starting the hydraulic push rod 3034, extending the hydraulic push rod 3034 to push the support plate 3032, further pushing the second screw feeder 302 upwards in the sleeve seat 3031, so that the feed port 3023 on the second screw feeder 302 is separated from the discharge port 206 in a staggered manner, and then stopping the extension of the hydraulic push rod 3034;

s702: starting the coarse material crusher 201, the fine material grinder 203, the first screw feeder 301, the support motor 4022 and the second forward and reverse rotation motor 4031, feeding the concrete slag blocks into the coarse material crusher 201 through the excavator, crushing the concrete slag blocks through the operation of the coarse material crusher 201, discharging crushed slag blocks formed by crushing from the bottom of the coarse material crusher 201, enabling the crushed slag blocks to fall into the first material guide hopper 202, then discharging from the discharge port 206, enabling the crushed slag blocks to fall into the fine material grinder 203, and fully grinding the crushed slag blocks through the fine material grinder 203;

s800: conveying the ground material: the ground material is discharged from the bottom of the fine material grinder 203, falls into a second guide hopper 204, is discharged from the bottom of the second guide hopper 204, is conveyed into a diversion bent pipe 205, is guided and conveyed to the bottom end of the first screw feeder 301 through the diversion bent pipe 205, is conveyed from the bottom end to the upper end by the operation of the first screw feeder 301, is finally discharged from a discharge port 3024 on the first screw feeder, and falls into a barrel 4037;

s900: preparing fine particle crushed aggregates: repeating the operations of step S401 and step S402, and sieving the ground material falling into the cylinder 4037 through a fine material sieving net;

s1000: production of recycled concrete: and finally, adding cement, sand, stone and water into the mixer to be matched according to a certain proportion, and stirring to obtain the recycled concrete with the raw material being the fine particle crushed aggregates, so that the concrete slag blocks on the building construction site are reused.

The coarse material pulverizer 201, the fine material grinder 203, and the blender in the above embodiments are well known to those skilled in the art, and are used only without modification in their structures and functions.

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 preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims (10)

1. A recycled concrete production system comprising a base plate (100), characterized in that: the top of the bottom plate (100) is sequentially provided with a vibrating screening part (400), a stirring part (500), a feeding part (300) and a crushing part (200) from left to right;

the vibrating screening part (400) consists of a stable rotating mechanism (401), a vibrating buffer mechanism (402) and a screening mechanism (403);

the feeding part (300) comprises a first screw feeder (301), a second screw feeder (302) and a telescopic moving mechanism (303), and second supporting columns are fixedly connected to the front side and the rear side of the first screw feeder (301);

crushed aggregates part (200) comprise coarse fodder rubbing crusher (201), first guide fill (202), thin material grinding mill (203), second guide fill (204) and the curved pipeline of water conservancy diversion (205) that from the top down set gradually, the one end of the curved pipeline of water conservancy diversion (205) is linked together with the bottom output of second guide fill (204), bin outlet (206) have been seted up to the bottom of first guide fill (202), coarse fodder rubbing crusher (201) and thin material grinding mill (203) all are through supporting frame fixed mounting on bottom plate (100).

2. A recycled concrete production system as recited in claim 1, wherein: the first screw feeder (301) and the second screw feeder (302) are composed of a feeding barrel (3021), a feeding screw (3022), a feeding port (3023), a discharging port (3024), a secondary bevel gear (3025), a barrel cover (3026), a short shaft (3027), a main bevel gear (3028), and a feeding motor (3029), wherein the barrel cover (3026) is fixedly connected to the top of the feeding barrel (3021), the short shaft (3027) is rotatably connected to the inner cavity of the barrel cover (3026), the feeding motor (3029) is located beside the barrel cover (3026), a power output end of the feeding motor (3029) is connected to the short shaft (3027), the feeding port (3023) is arranged at the bottom end of the outer wall of the feeding barrel (3021), the main bevel gear (3028) is fixedly connected to the 3027), the discharging port (3024) is arranged at the top end of the outer wall of the short shaft of the feeding barrel (3021), and the feeding screw (3022) is rotatably connected to the inner cavity of the feeding barrel (3021), and the feeding screw (3022) extends into the inner cavity of the barrel cover (3026), the secondary bevel gear (3025) is fixedly connected to one end of the feeding screw (3022) extending into the inner cavity of the barrel cover (3026), the secondary bevel gear (3025) is meshed with the main bevel gear (3028), and the other end of the diversion curved pipeline (205) is communicated with the inner cavity of the feeding barrel (3021) in the first screw feeder (301) through a feeding hole (3023) in the first screw feeder (301).

3. A recycled concrete production system as recited in claim 1, wherein: the telescopic moving mechanism (303) comprises a sleeve seat (3031) and a support plate (3032), the sleeve seat (3031) is slidably sleeved on the outer wall of the second screw feeder (302), the support plate (3032) is fixedly connected to the outer wall of the second screw feeder (302), hydraulic push rods (3034) are arranged on the upper side and the lower side of the sleeve seat (3031), the power telescopic ends of the hydraulic push rods (3034) are fixedly connected with the support plate (3032), first support columns (3033) are fixedly connected to the front side and the rear side of the sleeve seat (3031), and the bottoms of the first support columns (3033) and the second support columns are fixedly connected with the base plate (100).

4. A recycled concrete production system as recited in claim 1, wherein: stabilize rotary mechanism (401) including prismatic (4013), the outer wall rigid coupling of prismatic (4013) has disc seat (4015), prismatic (4013) rotate through disc seat (4015) and are connected with steadying frame (4014), and the bottom and bottom plate (100) looks rigid coupling of steadying frame (4014), the inner chamber bottom of steadying frame (4014) is provided with first just reverse motor (4011), the power take off end of first just reverse motor (4011) is connected with reduction gear (4012), the power take off end of reduction gear (4012) and the bottom looks rigid coupling of prismatic (4013).

5. A recycled concrete production system as recited in claim 1, wherein: the vibration buffering mechanism (402) comprises a buffering spring (4021), a top plate (4026), two sets of abdicating through grooves (4025) and four sets of guiding telescopic rods (4027), wherein the top plate (4026) is fixedly connected to the top of a prism (4013), the buffering spring (4021) is sleeved on the prism (4013), supporting motors (4022) are arranged on the front side and the rear side of the buffering spring (4021), the two sets of supporting motors (4022) are fixedly arranged on the top of a stabilizing frame (4014) through bases (4023), cams (4024) are fixedly connected to the right power output ends of the two sets of supporting motors (4022), the two sets of abdicating through grooves (4025) are respectively arranged on the front side and the rear side of the top of the stabilizing frame (4014), the abdicating through grooves (4025) correspond to the cams (4024) one by one, the four sets of guiding telescopic rods (4027) are correspondingly distributed on the front side, the rear side and the left side and the right side of the prism (4013), and the top of the guiding telescopic rod (4027) is fixedly connected with the top plate (4026).

6. A recycled concrete production system as recited in claim 1, wherein: the screening mechanism (403) comprises a barrel (4037), the first screw feeder (301) and the second screw feeder (302) are distributed on the circumference periphery of the barrel (4037), the outer wall of the charging barrel (4037) is rotationally provided with a bearing plate (4036), the bearing plate (4036) is sleeved on the prism (4013) in a sliding way, the bearing plate (4036) is positioned between the guiding telescopic rod (4027) and the buffer spring (4021), the top of the bearing plate (4036) is fixedly connected with the bottom telescopic end of the guiding telescopic rod (4027), the outer wall of the charging barrel (4037) is fixedly connected with a ring spur gear (4035), the ring spur gear (4035) is positioned below the bearing plate (4036), a second positive and negative rotation motor (4031) is fixedly arranged at the bottom of the bearing plate (4036), the bottom power output end of the second positive and negative rotation motor (4031) is connected with a main spur gear (4032), and the main spur gear (4032) is meshed with a ring spur gear (4035).

7. A recycled concrete production system as recited in claim 6, wherein: the bottom of feed cylinder (4037) is provided with screening bottom plate (4034), the right-hand member and feed cylinder (4037) of screening bottom plate (4034) are switched over mutually, both sides all are provided with slope hydraulic telescoping rod (4033) around feed cylinder (4037), slope hydraulic telescoping rod (4033) are located the below of ring spur gear (4035), between the top of slope hydraulic telescoping rod (4033) and feed cylinder (4037), all rotate between the flexible end of bottom power of slope hydraulic telescoping rod (4033) and screening bottom plate (4034) and be connected, screening net (4038) is installed to the top gomphosis of screening bottom plate (4034), the external diameter of screening net (4038) is greater than the internal diameter of feed cylinder (4037), screening net (4038) are coarse material screening net or are fine material screening net.

8. A recycled concrete production system as recited in claim 1, wherein: the stirring part (500) is a stirrer which is positioned below the charging barrel (4037).

9. A recycled concrete production system as recited in claim 1, wherein: and flexible material blocking bodies are fixedly connected to the front side and the rear side of the bottom end of the outer wall of the second screw feeder (302).

10. A production process of recycled concrete is characterized by comprising the following steps: the concrete steps of the production process for recycled concrete are as follows:

1) when a crushed material of coarse particles is required

S100: the screening net (4038) is used for installing the coarse material screening net:

s101: the supporting motor (4022) works to drive the cam (4024) to rotate, the protruding end of the cam extends into the yielding through groove (4025), and the supporting motor (4022) stops working;

s102: the prism (4013) is driven to rotate on the stabilizing frame (4014) through the work of the first forward and reverse rotating motor (4011), the screening mechanism (403) is transferred forwards and is moved away from the upper part of the stirring part (500);

s103: the inclined hydraulic telescopic rods (4033) extend to drive the screening bottom plate (4034) to rotate and open at the bottom of the charging barrel (4037), at the moment, the screening net (4038) is selected to be a coarse material screening net, then the coarse material screening net is embedded and replaced on the screening bottom plate (4034), the inclined hydraulic telescopic rods (4033) contract to drive the screening bottom plate (4034) to rotate and close at the bottom of the charging barrel (4037), and fixed installation between the charging barrel (4037) and the screening bottom plate (4034) when the screening net (4038) is the coarse material screening net is completed;

s104: starting a first forward and reverse rotating motor (4011), rotating in a direction opposite to that of the first forward and reverse rotating motor (4011) in the step S102, and moving the screening mechanism (403) to the position above the stirring part (500) for resetting;

s200: and (3) crushing the concrete slag blocks: feeding through an excavator, putting concrete slag blocks into a coarse material crusher (201), crushing the concrete slag blocks through the operation of the coarse material crusher (201), discharging crushed slag blocks formed by crushing from the bottom of the coarse material crusher (201), falling into a first material guide hopper (202), then discharging from a discharge port (206) and inputting into the bottom end of a second screw feeder (302);

s300: conveying the crushed slag blocks: the second screw feeder (302) works to convey the slag lump from the bottom end to the upper end, and finally the slag lump is discharged from a discharge hole (3024) on the slag lump and falls into the charging barrel (4037);

s400: preparing coarse particle crushed aggregates:

s401: the supporting motor (4022) continuously drives the cam (4024) to rotate, the bearing plate (4036) slides up and down back and forth on the prism (4013), and the sieving mechanism (403) is further driven to vibrate up and down back and forth;

s402: meanwhile, the main spur gear (4032) is driven to rotate through the forward rotation of a second forward and reverse rotation motor (4031), the charging barrel (4037) is driven to rotate back and forth on the bearing plate (4036) clockwise and anticlockwise through the meshing transmission of the main spur gear (4032) and the ring spur gear (4035), and the crushed slag blocks falling into the charging barrel (4037) are screened through a coarse material screening net;

s500: production of recycled concrete: the screened coarse particle crushed aggregates fall into a stirrer, cement, sand, stone and water are added into the stirrer to be matched according to a certain proportion, and the mixture is stirred to obtain recycled concrete with the raw materials of the coarse particle crushed aggregates, so that concrete slag blocks on a building construction site are reused;

2) when small pieces of fine particles are required

S600: the screening net (4038) is used for installing the fine material screening net:

s601: the supporting motor (4022) works to drive the cam (4024) to rotate, the protruding end of the cam extends into the yielding through groove (4025), and the supporting motor (4022) stops working;

s602: the prism (4013) is driven to rotate on the stabilizing frame (4014) through the work of the first forward and reverse rotation motor (4011), the screening mechanism (403) is transferred forwards and is moved away from the upper part of the stirring part (500);

s603: the inclined hydraulic telescopic rod (4033) extends to drive the screening bottom plate (4034) to rotate and open at the bottom of the charging barrel (4037), and at the moment, the raw material which is left in the screening crushed slag block material in the charging barrel (4037) and is not completely crushed into coarse particle crushed material is discharged;

s604: then taking the coarse material screening net down from the screening bottom plate (4034), selecting the screening net (4038) as a fine material screening net, then embedding and replacing the fine material screening net on the screening bottom plate (4034), and driving the screening bottom plate (4034) to rotate and close at the bottom of the charging barrel (4037) through contraction of the inclined hydraulic telescopic rod (4033), so as to finish the fixed installation between the charging barrel (4037) and the screening bottom plate (4034) when the screening net (4038) is the fine material screening net;

s605: starting a first forward and reverse rotating motor (4011), rotating in a direction opposite to that of the first forward and reverse rotating motor (4011) in the step S602, and moving the screening mechanism (403) to a position above the stirring part (500) for resetting;

s700: and (3) crushing the concrete slag blocks:

s701: the support plate (3032) is pushed by extending the hydraulic push rod (3034), and then the second screw feeder (302) is pushed upwards in the sleeve seat (3031), so that the feeding port (3023) on the second screw feeder (302) is separated from the discharging port (206) in a staggered manner;

s702: feeding by an excavator, putting concrete slag blocks into a coarse material crusher (201), crushing the concrete slag blocks by the operation of the coarse material crusher (201), discharging crushed slag blocks formed by crushing from the bottom of the coarse material crusher (201), falling into a first material guide hopper (202), then discharging from a discharge port (206) and falling into a fine material grinding mill (203), and fully grinding the crushed slag blocks by the fine material grinding mill (203);

s800: conveying of ground material: the ground material is discharged from the bottom of the fine material grinding mill (203), falls into a second guide hopper (204), is discharged from the bottom of the second guide hopper (204), is conveyed into a flow guide bent pipeline (205), is guided and conveyed to the bottom end of a first screw feeder (301) through the flow guide bent pipeline (205), is conveyed to the upper end from the bottom end by the operation of the first screw feeder (301), is finally discharged from a discharge hole (3024) above the first screw feeder, and falls into a charging barrel (4037);

s900: preparing fine particle crushed aggregates: repeating the actions of the step S401 and the step S402, and screening the ground material falling into the material barrel (4037) through a fine material screening net;

s1000: production of recycled concrete: and finally, adding cement, sand, stone and water into the mixer to be matched according to a certain proportion, and stirring to obtain the recycled concrete with the raw material being the fine particle crushed aggregates, so that the concrete slag blocks on the building construction site are reused.

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