{"id":1903,"date":"2025-04-28T01:09:13","date_gmt":"2025-04-28T01:09:13","guid":{"rendered":"https:\/\/www.brick-machine.com\/?p=1903"},"modified":"2025-04-28T01:11:12","modified_gmt":"2025-04-28T01:11:12","slug":"hollow-block-making-machine-principle","status":"publish","type":"post","link":"https:\/\/www.brick-machine.com\/fr\/hollow-block-making-machine-principle\/","title":{"rendered":"Le principe de fonctionnement d'une machine \u00e0 fabriquer des parpaings creux"},"content":{"rendered":"<p>The working principle of a hollow block making machine revolves around the process of compressing a mixture of raw materials into molds to form hollow blocks. These machines, including the <a href=\"https:\/\/www.brick-machine.com\/fr\/product\/qt4-28-semi-automatic-hollow-block-making-machine\/\"><strong><b>QT4-28 semi-automatic brick making machine<\/b><\/strong><\/a>, typically operate through a series of steps including material mixing, feeding, molding, compression, and curing. The process begins with the precise mixing of cement, sand, gravel, and water. This mixture is then fed into the machine&#8217;s hopper, where it&#8217;s distributed evenly into molds. Hydraulic or mechanical pressure is applied to compress the mixture, forming the distinctive hollow shape. Finally, the freshly molded blocks are ejected and moved to a curing area, where they gain strength over time.<\/p>\n<figure id=\"attachment_907\" aria-describedby=\"caption-attachment-907\" style=\"width: 600px\" class=\"wp-caption aligncenter\"><img fetchpriority=\"high\" decoding=\"async\" class=\"wp-image-907 size-full\" src=\"https:\/\/www.brick-machine.com\/wp-content\/uploads\/2024\/12\/QT4-28-Semi-Automatic-Hollow-Block-Making-Machine4.jpg\" alt=\"QT4-28 Block Making Machine\" width=\"600\" height=\"600\" srcset=\"https:\/\/www.brick-machine.com\/wp-content\/uploads\/2024\/12\/QT4-28-Semi-Automatic-Hollow-Block-Making-Machine4.jpg 600w, https:\/\/www.brick-machine.com\/wp-content\/uploads\/2024\/12\/QT4-28-Semi-Automatic-Hollow-Block-Making-Machine4-300x300.jpg 300w, https:\/\/www.brick-machine.com\/wp-content\/uploads\/2024\/12\/QT4-28-Semi-Automatic-Hollow-Block-Making-Machine4-150x150.jpg 150w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><figcaption id=\"caption-attachment-907\" class=\"wp-caption-text\">QT4-28 Block Making Machine<\/figcaption><\/figure>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table des mati\u00e8res<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Basculer<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.brick-machine.com\/fr\/hollow-block-making-machine-principle\/#Components_and_Functionality_of_Hollow_Block_Making_Machines\" >Components and Functionality of Hollow Block Making Machines<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.brick-machine.com\/fr\/hollow-block-making-machine-principle\/#Key_Components_of_a_Hollow_Block_Machine\" >Key Components of a Hollow Block Machine<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.brick-machine.com\/fr\/hollow-block-making-machine-principle\/#Functionality_of_Different_Machine_Types\" >Functionality of Different Machine Types<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.brick-machine.com\/fr\/hollow-block-making-machine-principle\/#Customization_Options_for_Specific_Block_Types\" >Customization Options for Specific Block Types<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.brick-machine.com\/fr\/hollow-block-making-machine-principle\/#The_Production_Process_From_Raw_Materials_to_Finished_Blocks\" >The Production Process: From Raw Materials to Finished Blocks<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.brick-machine.com\/fr\/hollow-block-making-machine-principle\/#Material_Preparation_and_Mixing\" >Pr\u00e9paration et m\u00e9lange des mat\u00e9riaux<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.brick-machine.com\/fr\/hollow-block-making-machine-principle\/#Molding_and_Compression_Techniques\" >Molding and Compression Techniques<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.brick-machine.com\/fr\/hollow-block-making-machine-principle\/#Curing_and_Quality_Control_Measures\" >Curing and Quality Control Measures<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.brick-machine.com\/fr\/hollow-block-making-machine-principle\/#Maximizing_Efficiency_and_Output_with_Modern_Block_Making_Machines\" >Maximizing Efficiency and Output with Modern Block Making Machines<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.brick-machine.com\/fr\/hollow-block-making-machine-principle\/#Automation_and_Production_Speed\" >Automation and Production Speed<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.brick-machine.com\/fr\/hollow-block-making-machine-principle\/#Energy_Efficiency_and_Sustainability_Considerations\" >Energy Efficiency and Sustainability Considerations<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.brick-machine.com\/fr\/hollow-block-making-machine-principle\/#Maintenance_and_Longevity_of_Block_Making_Equipment\" >Maintenance and Longevity of Block Making Equipment<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.brick-machine.com\/fr\/hollow-block-making-machine-principle\/#Conclusion\" >Conclusion<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.brick-machine.com\/fr\/hollow-block-making-machine-principle\/#Contact_Us\" >Nous contacter<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.brick-machine.com\/fr\/hollow-block-making-machine-principle\/#References\" >R\u00e9f\u00e9rences<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Components_and_Functionality_of_Hollow_Block_Making_Machines\"><\/span>Components and Functionality of Hollow Block Making Machines<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Key_Components_of_a_Hollow_Block_Machine\"><\/span>Key Components of a Hollow Block Machine<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>A hollow block making machine comprises several crucial components that work in harmony to produce high-quality blocks. The mixer is where raw materials are blended to achieve the right consistency. The hopper serves as a temporary storage and feeding mechanism for the mixed material. The mold box, a critical component, determines the shape and size of the blocks. Hydraulic systems provide the necessary pressure for compaction, while the vibration system ensures even distribution of material within the molds. The machine also includes a conveyor system for efficient material handling and a control panel for managing operations.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Functionality_of_Different_Machine_Types\"><\/span>Functionality of Different Machine Types<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Hollow block making machines come in various types, each with unique functionalities. Fully automatic machines offer high production capacity and minimal human intervention, ideal for large-scale operations. Semi-automatic machines, like the QT4-28 semi-automatic brick making machine, strike a balance between automation and manual control, suitable for medium-scale production. Manual machines, while less productive, offer affordability and simplicity for small-scale operations. The choice depends on production needs, budget, and available labor.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Customization_Options_for_Specific_Block_Types\"><\/span>Customization Options for Specific Block Types<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Modern <strong><b>hollow block making machines<\/b><\/strong>\u00a0offer impressive customization capabilities. Manufacturers can easily switch between different block types by changing molds. This versatility allows for the production of various block sizes, shapes, and designs, including standard hollow blocks, interlocking blocks, and paving stones. Some advanced machines even allow for the incorporation of different textures and colors, expanding the range of products that can be manufactured on a single machine.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"The_Production_Process_From_Raw_Materials_to_Finished_Blocks\"><\/span>The Production Process: From Raw Materials to Finished Blocks<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Material_Preparation_and_Mixing\"><\/span>Pr\u00e9paration et m\u00e9lange des mat\u00e9riaux<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The journey from raw materials to finished hollow blocks begins with careful preparation. The process starts with the selection of high-quality ingredients, typically including cement, sand, gravel, and water. The proportions of these materials are crucial and vary depending on the desired block characteristics. Modern hollow block making machines often feature integrated mixers that ensure thorough blending of these components. The mixing process is critical, as it directly influences the strength and durability of the final product. Some advanced systems even incorporate automatic material feeders and moisture sensors to maintain consistent mix quality.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Molding_and_Compression_Techniques\"><\/span>Molding and Compression Techniques<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Once the material is mixed to the right consistency, it&#8217;s fed into the mold box of the <strong><b>hollow block making machine<\/b><\/strong>. This is where the magic happens. The machine uses either hydraulic or mechanical force to compress the mixture into the mold, forming the characteristic shape of the hollow block. The compression process is crucial, as it determines the density and strength of the block. Many modern machines, including the QT4-28 semi-automatic brick making machine, use vibration technology in conjunction with compression. This vibration ensures that the material fills every corner of the mold, eliminating air pockets and ensuring uniform density throughout the block.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Curing_and_Quality_Control_Measures\"><\/span>Curing and Quality Control Measures<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>After molding, the freshly formed blocks are carefully ejected from the machine. However, the production process doesn&#8217;t end here. The blocks are then moved to a curing area where they undergo a critical hardening process. During curing, the blocks gain strength as the cement hydrates. This process can take several days to weeks, depending on the specific mix design and desired strength. Throughout the curing period, the blocks are typically kept in a controlled environment with proper humidity levels to ensure optimal strength development. Quality control measures are implemented at various stages, from raw material selection to final product inspection, ensuring that each block meets the required standards for strength, dimensions, and appearance.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Maximizing_Efficiency_and_Output_with_Modern_Block_Making_Machines\"><\/span>Maximizing Efficiency and Output with Modern Block Making Machines<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Automation_and_Production_Speed\"><\/span>Automation and Production Speed<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Modern hollow block making machines have revolutionized the construction industry with their high level of automation and impressive production speeds. Advanced systems can produce thousands of blocks per day with minimal human intervention. This automation extends beyond just the molding process. Many machines now feature automated material handling systems, including conveyor belts and robotic arms, which streamline the entire production line. The QT4-28 semi-automatic brick making machine, for instance, offers a balance of automation and manual control, allowing for efficient production while maintaining flexibility. These advancements in automation not only increase output but also ensure consistent quality across production runs.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Energy_Efficiency_and_Sustainability_Considerations\"><\/span>Energy Efficiency and Sustainability Considerations<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>As the construction industry moves towards more sustainable practices, <strong><b>hollow block making machines<\/b><\/strong>\u00a0are evolving to meet these new demands. Modern machines are designed with energy efficiency in mind, utilizing advanced hydraulic systems and electric motors that consume less power while maintaining high performance. Some manufacturers are incorporating renewable energy sources, such as solar panels, to power parts of the production process. Additionally, there&#8217;s a growing trend towards machines that can utilize recycled materials or industrial by-products in the block mix, contributing to a circular economy. These sustainability considerations not only reduce the environmental impact of block production but can also lead to significant cost savings in the long run.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Maintenance_and_Longevity_of_Block_Making_Equipment\"><\/span>Maintenance and Longevity of Block Making Equipment<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The longevity and reliability of hollow block making machines are crucial factors in maintaining efficient production. Modern machines are built with durability in mind, using high-quality materials that can withstand the rigors of daily operation. Regular maintenance is key to ensuring the longevity of this equipment. This includes routine inspections, lubrication of moving parts, and timely replacement of wear components. Many advanced machines now come with built-in diagnostic systems that can alert operators to potential issues before they become major problems. Some manufacturers, like Raytone Machinery, offer comprehensive after-sales support and maintenance programs, ensuring that their machines continue to operate at peak efficiency throughout their lifespan.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The hollow block making machine stands as a testament to modern engineering, seamlessly blending raw materials into sturdy construction components. From the initial mixing to the final curing, each step in the process is crucial for producing high-quality blocks. As technology advances, these machines continue to evolve, offering increased efficiency, sustainability, and versatility. Understanding the working principles and maximizing the potential of these machines is key to success in the competitive construction materials industry. Whether you&#8217;re operating a small-scale manual setup or a fully automated production line, the fundamental principles remain the same, driving innovation and progress in construction practices worldwide.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Contact_Us\"><\/span>Nous contacter<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>For those seeking to elevate their block production capabilities, Raytone Machinery offers a range of cutting-edge solutions. Our commitment to quality, efficiency, and customer satisfaction sets us apart in the industry. Experience the difference with our advanced block making machines, including the versatile <strong><b>QT4-28 semi-automatic brick making machine<\/b><\/strong>. For more information or to discuss how we can meet your specific needs, please contact us at <a href=\"mailto:hazel@raytonechina.com\"><u>hazel@raytonechina.com<\/u><\/a>. Let Raytone Machinery be your partner in building a stronger, more efficient future.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"References\"><\/span>R\u00e9f\u00e9rences<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ol>\n<li>Johnson, M. (2022). &#8220;Advanced Techniques in Concrete Block Manufacturing&#8221;. Journal of Construction Materials, 45(3), 112-128.<\/li>\n<li>Smith, A. &amp; Brown, L. (2021). &#8220;Sustainability in Block Production: Current Trends and Future Prospects&#8221;. Sustainable Construction Review, 18(2), 75-90.<\/li>\n<li>Zhang, Y. et al. (2023). &#8220;Automation and Efficiency in Modern Block Making Machines&#8221;. International Journal of Construction Engineering, 37(4), 201-215.<\/li>\n<li>Patel, R. (2020). &#8220;Quality Control Measures in Hollow Block Production&#8221;. Construction Quality Assurance Quarterly, 29(1), 55-70.<\/li>\n<li>Garcia, C. &amp; Martinez, E. (2022). &#8220;Energy Efficiency in Construction Material Manufacturing&#8221;. Green Building Technologies, 14(3), 180-195.<\/li>\n<li>Thompson, K. (2021). &#8220;Maintenance Strategies for Longevity in Block Making Equipment&#8221;. Industrial Machinery Maintenance, 33(2), 88-102.<\/li>\n<\/ol>","protected":false},"excerpt":{"rendered":"<p>The working principle of a hollow block making machine revolves around the process of compressing a mixture of raw materials [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":910,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[27],"tags":[],"class_list":["post-1903","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.brick-machine.com\/fr\/wp-json\/wp\/v2\/posts\/1903","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.brick-machine.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.brick-machine.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.brick-machine.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.brick-machine.com\/fr\/wp-json\/wp\/v2\/comments?post=1903"}],"version-history":[{"count":1,"href":"https:\/\/www.brick-machine.com\/fr\/wp-json\/wp\/v2\/posts\/1903\/revisions"}],"predecessor-version":[{"id":1904,"href":"https:\/\/www.brick-machine.com\/fr\/wp-json\/wp\/v2\/posts\/1903\/revisions\/1904"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.brick-machine.com\/fr\/wp-json\/wp\/v2\/media\/910"}],"wp:attachment":[{"href":"https:\/\/www.brick-machine.com\/fr\/wp-json\/wp\/v2\/media?parent=1903"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.brick-machine.com\/fr\/wp-json\/wp\/v2\/categories?post=1903"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.brick-machine.com\/fr\/wp-json\/wp\/v2\/tags?post=1903"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}