KHOÁNG SẢN TÂN THỊNH
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CÔNG TY CỔ PHẦN KHOÁNG SẢN TÂN THỊNH
KHAI THÁC VÀ CUNG CẤP CÁC LOẠI VẬT LIỆU XÂY DỰNG
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Enhancing the Quality of Construction Stone Crushers
Enhancing the Quality of Construction Stone Crushers
Purpose and Requirements: The demand for diverse types of crushed stone used in construction in Binh Duong has been significant in the past, present, and future. The cost of crushed stone is greatly influenced by the cost of the mixture, as crushed stone cannot be directly extracted from nature but needs to be processed. Revenue from mining construction stone contributes to approximately 60% of the company's total revenue.
However, the current state of crushers at Company is deteriorating, necessitating replacement or improvement to ensure uniformity in the size of crushed stone, minimize dust production, and increase the value of the product to compete with similar products in the market. Therefore, improving the quality of construction stone exploitation is imperative for the company to maintain high revenue, brand reputation, and market share. As the Project Development Manager at Binh Duong Mineral and Construction Joint Stock Company, I have undertaken research and implementation of the project "Improving the Quality of Construction Stone Crushers".
Implementation Process for the Project:
Step 1: Collection and Processing of Data: The relevant departments were directed to collect and process data, including data, documents, and images related to the abrasion of the fixed jaws and the wear of the movable jaws in the stone crushing system. The data was collected from 08 stone crushers operating at Phuoc Vinh quarry (Phu Giao district, Binh Duong province) and Tan Thinh. The collected data was carefully screened, analyzed, and evaluated to select the relevant data for the research project and conduct further data processing.
Data Processing: This step involved the selection and systematization of various parts of the available information and data to derive the rules of abrasive wear of the mill in the existing stone crushing system in Vietnam. The following rules were drawn from the data collected from the company's quarries:
• The fixed cheek has a faster wear rate than the movable cheek.
• The fixed cheek wears the fastest and deepest at the middle point 2/3 from the upper edge of the grinding cheek and spreads to the surrounding locations.
• The movable cheek wears the fastest and most at the midpoint of the end edge of the grinding cheek and gradually deepens to the upper 1/3.
• Two fixed cheeks need to be replaced to replace one movable cheek.
Step 2: Verification of Research Results: The research results, including the data and rules derived from the project, were verified by studying 08 existing stone crushing systems at the Company and comparing the data with the crushing systems of other companies. The abrasiveness of the cheeks in the stone crushing systems of these companies was found to be similar to the results of the project. Based on these findings, the project proposed general rules and treatment plans, which included:
• Using grinding cheeks for mining.
• Welding with alloy welding rods.
• Manufacturing grinding cheeks with gray cast iron turned white.
• Improving the quality of the mill surface with trace elements.
Step 3: Improvement of Stone Crusher: After the completion of the research project, the team of engineers and technicians of Tan Thinh Company, under my direction, improved the system of 08 stone crushers belonging to the company. The improvements included:
• Construction of stone crusher: The dynamics were optimized to reduce the sliding stroke of the movable cheek during the compression stroke by raising the eccentric shaft higher than the upper edge of the fixed cheek. The surface of the grinding cheek was shaped with equilateral triangular ribs to create a large impulse during the compression stroke, promote stone breaking when the two jaws come close together, and reduce the contact area between the jaw and the crushed stone to minimize wear during grinding.
• Improving Grinding Mill Quality: Tan Thinh Company's engineers and technicians collaborate with the Company's mechanical workshop to manufacture grinding mills and wear-resistant components using new materials such as alloy steel with trace elements, treated with high temperature and high-pressure heat treatment technology. The grinding mill features a new structure including a liner and grinding rod made of structural steel 40, with its own heat treatment to ensure optimal surface hardness and ductility. The mill bars are made of high-speed steel and connected to the plate with countersunk head bolts. Proper heat treatment and impregnation with coal and nitrogen increase the surface hardness of the steel mill bars. These grinding mills have been successfully installed and tested, demonstrating satisfactory stone grinding performance at a low cost, without accumulating abrasiveness commonly found in foreign crushers sold in the Vietnamese market.
• Rotating Grinding Cheek Head: During usage, the fixed and movable jaws of the grinding cheek experience abrasion mostly in the lower half of the cheek, while the upper half is minimally affected. When the lower part of the grinding cheek is close to the end of the tooth top and about to break, the head of the grinding cheek can be removed and rotated to continue grinding the stone. This practice saves an additional 17,000m3 of crushed ice per month.
NGO THANH TUNG
Purpose and Requirements: The demand for diverse types of crushed stone used in construction in Binh Duong has been significant in the past, present, and future. The cost of crushed stone is greatly influenced by the cost of the mixture, as crushed stone cannot be directly extracted from nature but needs to be processed. Revenue from mining construction stone contributes to approximately 60% of the company's total revenue.
However, the current state of crushers at Company is deteriorating, necessitating replacement or improvement to ensure uniformity in the size of crushed stone, minimize dust production, and increase the value of the product to compete with similar products in the market. Therefore, improving the quality of construction stone exploitation is imperative for the company to maintain high revenue, brand reputation, and market share. As the Project Development Manager at Binh Duong Mineral and Construction Joint Stock Company, I have undertaken research and implementation of the project "Improving the Quality of Construction Stone Crushers".
Implementation Process for the Project:
Step 1: Collection and Processing of Data: The relevant departments were directed to collect and process data, including data, documents, and images related to the abrasion of the fixed jaws and the wear of the movable jaws in the stone crushing system. The data was collected from 08 stone crushers operating at Phuoc Vinh quarry (Phu Giao district, Binh Duong province) and Tan Thinh. The collected data was carefully screened, analyzed, and evaluated to select the relevant data for the research project and conduct further data processing.
Data Processing: This step involved the selection and systematization of various parts of the available information and data to derive the rules of abrasive wear of the mill in the existing stone crushing system in Vietnam. The following rules were drawn from the data collected from the company's quarries:
• The fixed cheek has a faster wear rate than the movable cheek.
• The fixed cheek wears the fastest and deepest at the middle point 2/3 from the upper edge of the grinding cheek and spreads to the surrounding locations.
• The movable cheek wears the fastest and most at the midpoint of the end edge of the grinding cheek and gradually deepens to the upper 1/3.
• Two fixed cheeks need to be replaced to replace one movable cheek.
Step 2: Verification of Research Results: The research results, including the data and rules derived from the project, were verified by studying 08 existing stone crushing systems at the Company and comparing the data with the crushing systems of other companies. The abrasiveness of the cheeks in the stone crushing systems of these companies was found to be similar to the results of the project. Based on these findings, the project proposed general rules and treatment plans, which included:
• Using grinding cheeks for mining.
• Welding with alloy welding rods.
• Manufacturing grinding cheeks with gray cast iron turned white.
• Improving the quality of the mill surface with trace elements.
Step 3: Improvement of Stone Crusher: After the completion of the research project, the team of engineers and technicians of Tan Thinh Company, under my direction, improved the system of 08 stone crushers belonging to the company. The improvements included:
• Construction of stone crusher: The dynamics were optimized to reduce the sliding stroke of the movable cheek during the compression stroke by raising the eccentric shaft higher than the upper edge of the fixed cheek. The surface of the grinding cheek was shaped with equilateral triangular ribs to create a large impulse during the compression stroke, promote stone breaking when the two jaws come close together, and reduce the contact area between the jaw and the crushed stone to minimize wear during grinding.
• Improving Grinding Mill Quality: Tan Thinh Company's engineers and technicians collaborate with the Company's mechanical workshop to manufacture grinding mills and wear-resistant components using new materials such as alloy steel with trace elements, treated with high temperature and high-pressure heat treatment technology. The grinding mill features a new structure including a liner and grinding rod made of structural steel 40, with its own heat treatment to ensure optimal surface hardness and ductility. The mill bars are made of high-speed steel and connected to the plate with countersunk head bolts. Proper heat treatment and impregnation with coal and nitrogen increase the surface hardness of the steel mill bars. These grinding mills have been successfully installed and tested, demonstrating satisfactory stone grinding performance at a low cost, without accumulating abrasiveness commonly found in foreign crushers sold in the Vietnamese market.
• Rotating Grinding Cheek Head: During usage, the fixed and movable jaws of the grinding cheek experience abrasion mostly in the lower half of the cheek, while the upper half is minimally affected. When the lower part of the grinding cheek is close to the end of the tooth top and about to break, the head of the grinding cheek can be removed and rotated to continue grinding the stone. This practice saves an additional 17,000m3 of crushed ice per month.
NGO THANH TUNG