CN-117085789-B - Construction method for multistage crushing and screening of construction waste as resource

CN117085789BCN 117085789 BCN117085789 BCN 117085789BCN-117085789-B

Abstract

The invention relates to the technical field of construction waste crushing, and discloses a construction method for multistage crushing and screening of construction waste as resources, which comprises the steps of conveying the construction waste to a crushing station; the crushing station is provided with a reaction crusher, the reaction crusher crushes the construction waste into crushed materials, the crushed materials are discharged through a discharge hole, the crushed materials are conveyed into a single-layer primary vibrating screen, the crushed materials are screened into coarse materials and fine materials through the primary vibrating screen, the fine materials are conveyed into a screening station, the screening station is provided with a multi-layer secondary vibrating screen, the fine materials are screened through the multi-layer secondary vibrating screen from top to bottom, screening materials with different particle sizes and sequentially intercepted by the multi-layer secondary vibrating screen and powder passing through the multi-layer secondary vibrating screen are formed, and the screening materials are separated and output. The obtained powder and various screening materials intercepted by the vibrating screens at each level can be used as raw materials for making bricks or concrete and the like, thereby realizing the waste recycling, improving the comprehensive utilization rate of the construction waste and having remarkable economic and social benefits.

Inventors

LEI BIN
WANG ZHIQUAN
YAO ZEXI
LI YOULIN
LEI FAN
WU YUDONG
WANG WENWEN
SUN XIAOHUI
LI XINLIN
TONG XIN
Lin Muyou
LI KAI
Sha Zhenhui
Wu Anshuang
YANG JUNQING

Assignees

深圳市工勘岩土集团有限公司
深圳大学

Dates

Publication Date: 20260508
Application Date: 20230830

Claims (8)

1. The construction method for multistage crushing and screening of the construction waste is characterized by comprising the following construction steps of: 1) Conveying the construction waste to a crushing station; 2) The crushing station is provided with a reaction crusher, a crushing cavity is arranged in the reaction crusher, a feeding hole and a discharging hole which are communicated with the crushing cavity are formed in the reaction crusher, a crushing area is arranged in the crushing cavity, a plurality of concentric rotating plate hammers are arranged in the crushing area, and a reaction lining plate is arranged at the outer side of the crushing area; Conveying the construction waste into a crushing area through a feed inlet, enabling a plurality of plate hammers to impact the construction waste through rotation, enabling the impact lining plates to rebound the construction waste deviated from the crushing area back to the crushing area until the impact crusher crushes the construction waste into crushed materials, and discharging the crushed materials through a discharge outlet; 3) Conveying the crushed materials into a single-layer primary vibrating screen, and screening the crushed materials into coarse materials and fine materials through the primary vibrating screen; 4) The fine materials are conveyed into a screening station, a plurality of layers of secondary vibrating screens are arranged in the screening station, the fine materials are screened through the plurality of layers of secondary vibrating screens from top to bottom, screening materials with different particle sizes and sequentially intercepted by the plurality of layers of secondary vibrating screens and powder passing through the plurality of layers of secondary vibrating screens are formed, and the screening materials are separated and output; the multi-layer secondary vibrating screen is a three-layer screen, the first layer of screen screens crushed stone, the second layer of screen screens sand-sized materials, and the third layer of screen screens fine sand-sized materials; the impact lining plate is provided with an impact side wall facing the crushing zone and a deviation side wall deviating from the crushing zone, the middle part of the impact side wall deviates from the crushing zone and protrudes outwards to form a bent shape, the crushing cavity is internally provided with the impact zone, the deviation side wall is connected with a telescopic device, and the telescopic device is obliquely arranged downwards along the direction from top to bottom of the impact zone; in the construction step 2), when the construction waste is impacted and deviated by the board hammer into the impact zone, the construction waste impacts the impact side wall of the impact lining board and bounces into the crushing zone; when the construction waste is bounced back to the crushing area by the side wall, the telescopic device drives the impact lining plate to swing away from the crushing area for resetting, and the bottom of the impact lining plate at the lower part of the impact area is aligned with the discharge hole up and down; the impact side wall is hinged with a rotating head, the rotating head is provided with a plurality of stirring arms, the inner ends of the stirring arms are fixedly connected with the rotating head, and the outer ends of the stirring arms extend towards the crushing area; in the construction step 2), when the construction waste collides to the impact lining plate, and in the process that the telescopic device drives the impact lining plate to swing, the stirring arms rotate along with the rotating head, so as to stir the construction waste which collides to the impact lining plate in a rotating way, and the elastic layer rebounds the construction waste to return to the crushing area.
2. The construction method for multi-stage crushing and screening of construction waste as claimed in claim 1, wherein the crushing station is provided with a frame, a walking crawler is arranged at the bottom of the frame, and the impact crusher is arranged on the frame.
3. The construction method for multi-stage crushing and screening of construction waste as claimed in claim 2, wherein the primary vibrating screen is provided on a frame, and the impact crusher and the primary vibrating screen are sequentially arranged along the front-rear direction of the frame.
4. The construction method for multi-stage crushing and screening of construction waste as claimed in claim 1, wherein the discharge port is arranged at the lower part of the impact crusher, and the discharge port is communicated with the top of the primary vibrating screen through a primary conveying belt; In the construction step 2), the crushed materials discharged from the discharge hole fall onto a primary conveying belt, are conveyed to the top of the primary vibrating screen by the primary conveying belt, and fall onto the primary vibrating screen from top to bottom.
5. The construction method for multi-stage crushing and screening of construction waste as claimed in claim 2, wherein the screening station is provided with a receiving hopper, a plurality of layers of secondary vibrating screens are arranged at intervals from top to bottom, and the plurality of layers of secondary vibrating screens are arranged in an inclined manner; The lower ends of the secondary vibrating screens of all layers are respectively provided with a discharge conveying belt, and the discharge conveying belts are obliquely arranged upwards along the conveying direction of the discharge conveying belts; in the construction step 4), the fine materials are placed in a receiving hopper, and the fine materials in the receiving hopper are transmitted above a multi-level vibrating screen through a secondary conveying belt and fall onto the secondary vibrating screen from top to bottom; The fine materials sequentially pass through a multi-layer secondary vibrating screen from top to bottom to form a plurality of screening materials and powder, the plurality of screening materials are respectively and correspondingly arranged on the multi-layer secondary vibrating screen, the multi-layer secondary vibrating screen is correspondingly transmitted to a plurality of discharging conveying belts for separation and output, and the powder falls below the multi-layer vibrating screen; In the step 4), a fine material conveying belt is arranged below the primary vibrating screen, and the fine materials are conveyed into a receiving hopper through the fine material conveying belt.
6. The construction method for multi-stage crushing and screening of construction waste as claimed in claim 5, wherein a feeding hopper is arranged at the front end of the frame, the feeding hopper is communicated with a feeding port of the impact crusher, the feeding port is formed at the upper part of the impact crusher, and the crushing area is formed below the feeding port; in the construction step 2), the construction waste is placed in a feeding hopper, and the construction waste in the feeding hopper enters a crushing zone from top to bottom through a feeding hole; in the step 4), the coarse materials discharged from the coarse material outlet are conveyed to the upper part of the feeding hopper through the coarse material conveying belt and fall on the feeding hopper from top to bottom.
7. The construction method for multi-stage crushing and screening of construction waste recycling according to claim 1, wherein the feeding port and the crushing area are arranged in an up-down offset manner, a curved feeding channel is formed between the feeding port and the crushing area, a sliding bottom wall is formed at the bottom of the feeding channel, and the sliding bottom wall extends downwards and obliquely from the lower end of the feeding port to the crushing area; In the construction step 2), the construction waste passing through the feeding port enters the feeding channel and slides into the crushing area from top to bottom along the bottom wall of the sliding material.
8. The construction method for multi-stage crushing and screening of construction waste as claimed in claim 1, wherein the impact zone is arranged outside the crushing zone, extends downwards from the upper end of the feed inlet and is arranged in an offset manner with the crushing zone, and the feed inlet and the impact zone are respectively arranged at two sides of the crushing zone; along the direction from top to bottom of the impact area, the impact area is provided with a plurality of impact liners, the inside and outside of the impact liners are arranged in a staggered manner, and the adjacent impact liners are arranged in a staggered and overlapped manner from head to tail; In the construction step 2), after construction waste falling into the crushing zone is impacted by the rotation of a plurality of plate hammers, the construction waste deviated into the impact zone is bounced back into the crushing zone by a plurality of impact lining plates.

Description

Construction method for multistage crushing and screening of construction waste as resource Technical Field The invention relates to the technical field of construction waste crushing, in particular to a construction method for multistage crushing, screening and recycling of construction waste. Background In the construction and demolition process of the building, a large amount of construction waste such as waste soil, waste residue, waste materials and the like is generated, and according to statistics, the construction waste in China exceeds 20 hundred million tons in 2022, the construction waste cannot be naturally degraded, the main treatment mode in China is stacking landfill and recycling at present, but the capacity of a landfill site where the construction waste can be stacked landfill is limited, and the recycling only carries out arrangement on old materials which can be directly used, In the prior art, because the volume of the construction waste is huge, the capacity of a construction waste absorption field is limited, and corresponding recycling measures are lacked, the construction waste is difficult to effectively treat, and the construction waste occupies a large amount of land after long-term storage, so that serious pollution and ecological hazard are easily caused to soil, rivers, vegetation and atmosphere. Disclosure of Invention The invention aims to provide a construction method for multistage crushing and screening of construction waste, and aims to solve the problems that in the prior art, construction waste is difficult to effectively treat, and serious pollution and ecological hazard are caused. The invention discloses a construction method for multistage crushing and screening of construction waste, which comprises the following construction steps: 1) Conveying the construction waste to a crushing station; 2) The crushing station is provided with a reaction crusher, a crushing cavity is arranged in the reaction crusher, a feeding hole and a discharging hole which are communicated with the crushing cavity are formed in the reaction crusher, a crushing area is arranged in the crushing cavity, a plurality of concentric rotating plate hammers are arranged in the crushing area, and a reaction lining plate is arranged at the outer side of the crushing area; Conveying the construction waste into a crushing area through a feed inlet, enabling a plurality of plate hammers to impact the construction waste through rotation, enabling the impact lining plates to rebound the construction waste deviated from the crushing area back to the crushing area until the impact crusher crushes the construction waste into crushed materials, and discharging the crushed materials through a discharge outlet; 3) Conveying the crushed materials into a single-layer primary vibrating screen, and screening the crushed materials into coarse materials and fine materials through the primary vibrating screen; 4) The fine materials are conveyed to a screening station, a plurality of layers of secondary vibrating screens are arranged in the screening station, the fine materials are screened through the plurality of layers of secondary vibrating screens from top to bottom, screening materials with different particle sizes and sequentially intercepted by the plurality of layers of secondary vibrating screens and powder passing through the plurality of layers of secondary vibrating screens are formed, and the screening materials are separated and output. Optionally, the crushing station is provided with a frame, a walking crawler belt is arranged at the bottom of the frame, and the impact crusher is arranged on the frame. Optionally, the single-layer vibrating screen is arranged on the frame, and the impact crusher and the primary vibrating screen are sequentially arranged along the front-back direction of the frame. Optionally, the discharge hole is arranged at the lower part of the impact crusher, and the discharge hole is communicated with the top of the primary vibrating screen through a primary conveying belt; In the construction step 2), the crushed materials discharged from the discharge hole fall onto a primary conveying belt, are conveyed to the top of the primary vibrating screen by the primary conveying belt, and fall onto the primary vibrating screen from top to bottom. Optionally, the screening station is provided with a receiving hopper, a plurality of layers of secondary vibrating screens are arranged at intervals from top to bottom, and the plurality of layers of secondary vibrating screens are obliquely arranged; The lower ends of the secondary vibrating screens of all layers are respectively provided with a discharge conveying belt, and the discharge conveying belts are obliquely arranged upwards along the conveying direction of the discharge conveying belts; in the construction step 4), the fine materials are placed in a receiving hopper, and the fine materials in the receiving hopper are transmitted ab