QM-HL4200 teaching writing board procurement guide: push-pull green board parameters, adaptation

The push-pull green board is not an ordinary blackboard, and the purchase should be evaluated according to the teaching wall system.

In the smart classroom project, the push-pull green board is often treated as a "supporting role equipment": several general requirements are written during bidding, the quotation is estimated by square meters, and the goods are delivered to the construction team for installation. The real problem is often exposed after the installation is completed-the size of the green plate does not match the interactive plate, and the gap is obvious after closing; The sliding direction is blocked by the platform or door. After the flat plate was embedded, the heat dissipation port was covered and it took half a year to crash frequently. The prototype slid smoothly in the exhibition hall, but it was loaded into the classroom in batches because the track was not level and stuck.

The root of these problems is not whether the product itself is good or bad, but the green board, track, interactive plate and wall installation are disassembled and treated at the procurement stage. The essence of the push-pull green board is a set of sliding writing system designed around the interactive tablet: the outer writing board slides left and right, forming a complete blackboard writing area when closed, and exposing the interactive tablet in the middle when pushed open. It and the interactive tablet together form a teaching wall. Any deviation in the size, structure or installation conditions of any link will affect the normal use of the whole wall.

1. first clarify procurement requirements and usage scenarios

The green board configuration of different classrooms should not be exactly the same. The wall conditions, viewing distance and teacher standing positions of ordinary classrooms, amphitheatre, multifunctional classrooms and training classrooms are different. Directly applying a set of configuration lists to all classrooms will often be reworked during the construction phase.

The classroom information to be confirmed before purchasing includes: classroom type, classroom width and farthest viewing distance, green board installation position and available wall width, positional relationship between platform and door and passage, table and chair layout, size of interactive panel, whether ready-made equipment is available, and whether video booth or recording and broadcasting system is required. At the same time, it is also necessary to confirm the characteristics of the teaching task itself: whether it is mainly based on traditional blackboard writing derivation, drawing and listing steps, or on courseware, video, screen projection and annotation, how frequently the two are switched, whether it is necessary to save the blackboard writing content, and whether it is necessary to support large classes to watch in the back row.

This information should eventually fall into three documents: the classroom requirements table, the list of teaching tasks, and the table of existing equipment and network conditions. Their role is to determine the adaptation boundary before the tender, to prevent suppliers from bidding on common models.

How to write the core parameters of 2. QM-HL4200 teaching writing board

The key to parameter writing is "measurable, checkable, and acceptable". Expressions like "high quality", "smooth sliding" and "durable" cannot be compared at the bid evaluation stage and cannot be judged at the acceptance stage, and should be avoided as much as possible. The following are the main parameters of the QM-HL4200 teaching writing board and its procurement implications.

Structure and specifications

The product adopts a double-layer structure, the inner layer is a fixed writing board, and the outer layer is a sliding writing board, which can be opened and closed freely. It is used to ensure the safety management of the all-in-one machine and supports the central placement of interactive teaching whiteboard products. The length of the whole board is not less than 4000mm, and the height can be adjusted according to the interactive teaching whiteboard products to ensure effective matching with the interactive board.

In the bidding documents, in addition to length and height, the supplier should also be required to fill in the number of movable plates, the width of a single movable plate, the sliding stroke, the opening size of the interactive plate and the size range of the interactive plate that can be supported. These data directly determine whether the green board can be opened and closed normally in a specific classroom.

Board surface and writing performance

The board surface adopts metal baking varnish writing board surface, matt treatment, the color is dark green or beige, the gloss is not higher than 12 gloss units, and there is no glare caused by the blackboard itself. Smooth writing, clear handwriting, color coordination, good visual effect, can effectively alleviate the visual fatigue of students. Board surface with a layer of transparent protective film, the overall compliance with the GB28231-2011 "writing board safety and health requirements."

Gloss is an easily overlooked but directly measurable indicator. If the gloss is too high, reflective tape will be formed under the classroom side light or ceiling light, and the students in the back row cannot see the contents of the blackboard writing clearly. It is more binding to write the glossiness into the parameters and use the glossiness meter for random inspection at the time of acceptance than simply describing "anti-glare.

Liner, backplate and superstrate

The lining board is made of high-strength, sound-absorbing, moisture-proof and flame-retardant polystyrene board. The back plate is made of high-quality galvanized steel plate, and the mechanized assembly line is formed at one time. The cladding board adopts environment-friendly two-component polyurethane glue, and the automatic assembly line cladding operation ensures firm bonding, smooth board surface, and formaldehyde emission is not more than 0.2mg/L, which meets GB 28231-2011 "Safety and Health Requirements for Writing Board".

Formaldehyde emissions are recommended to be treated as a substantive response clause and suppliers are required to provide corresponding test reports at the bidding stage. School classrooms are closed spaces with dense personnel and limited ventilation conditions, and environmental indicators are not optional.

Border and rail structure

The frame is made of high-strength champagne-colored electrophoretic aluminum alloy profiles, with performance compliant with the GB/T 5237.3 standard. The transom size is not less than 57mm × 78mm, and the vertical frame size is not less than 29mm × 100mm. The track-mounted concealed sliding system prevents dust and debris from entering, addressing the issue of sliding performance being affected by dust at the structural level. The frame is equipped with a multi-purpose groove with a width of not less than 30mm. The multi-purpose groove is separated from the sliding system, and is formed with a mold of the frame. It can be placed with writing pens, pointer and other teaching aids, which does not affect the sliding of the sliding plate, and can also be used for centralized dust treatment.

The corrosion resistance of the frame shall be CASS 72H, not less than 10, and the wear resistance (falling sand test) shall not be less than 4000g. These two indicators are especially worth writing in the bidding documents in coastal areas, high humidity areas or projects with long service life requirements, because they are directly related to whether the frame will oxidize, fade and deform after many years of use.

Wrb angle, limit gear and pulley

The wrapping angle is injection molded with anti-aging high-strength ABS engineering plastic, the double-wall cavity streamlined design, the blackboard brand logo and the wrapping angle are molded at one time, and there is no sharp corner burr. Limit stops are installed on both inner sides of the horizontal frame to prevent the sliding panel from striking the vertical frame or pinching fingers during operation. The pulley adopts double-group high-precision bearing upper hanging wheel with lower horizontal sliding system, which is evenly installed up and down, with smooth sliding, low noise, accurate front and rear positioning, and the service life of the pulley is not less than 100000 times.

Limit gears and wrap angles are safety-related details. Students often touch the edge of the blackboard during recess. The design without sharp corners and burrs and anti-pinch should be clearly written as safety clauses, instead of judging by hand feeling during acceptance. The pulley life recommendation requires the supplier to provide a life test report or make a clear commitment in the contract.

Safety

The product uses a lock to lock the sliding blackboard, the key is universal, convenient and practical. The function of the lock is not only to protect the interactive tablet after class, but also to avoid the interference caused by the accidental movement of the sliding board in the classroom. This is especially important for schools-if each classroom has a different lock key, the management workload will increase significantly.

Parameter Response and Deviation Table

It is suggested to attach the technical parameter response and deviation form in the bidding documents, and require the supplier to fill in the response and supporting materials one by one. The following table can be used as a template reference.

How to check the adaptation of 3. interactive tablet

The green board and the interactive tablet must be designed according to the same teaching wall, rather than separately purchased and assembled on site. The adaptation check shall cover three levels: size, installation method and heat dissipation maintenance.

Size adaptation

The contents to be confirmed include the model, overall size and weight of the interactive flat plate; Whether the opening size of the green plate matches the flat plate; Whether there is a structural conflict between the green plate frame and the flat plate frame; Whether the green plate can completely cover the flat plate after closing; Whether the flat plate can be completely exposed after the green plate slides open; And whether there is a reasonable safety gap between the green plate and the flat plate. The opening size should be cross-checked at the beginning of the order, which is the most critical pre-condition for the entire project.

Installation Adapter

It is necessary to confirm whether the green plate and the flat plate share a bracket or track, whether wall hanging, mobile bracket or embedded installation is supported, whether a customized frame or frame is required, whether the sliding of the green plate will interfere with the installation and maintenance of the flat plate, and whether the scheme can be compatible with interactive flat plates of different brands and models. If the school already has a stock of interactive tablets, the supplier must confirm the adaptation according to the actual model, not only according to the standard size.

Heat dissipation and maintenance

After the green plate is closed, the ventilation opening of the flat plate cannot be blocked. The heat dissipation and maintenance space of OPS must be reserved. The ventilation gap between the green plate and the flat plate should be reserved. At the same time, it is necessary to ensure that the parts can be easily checked, cleaned and replaced in the later period. This recommendation is listed separately in the tender documents and requires the supplier to provide a description of the heat dissipation and maintenance space and to be confirmed on site at the time of acceptance. The following is a reference table for the fit check.

How to verify the 4. site investigation and installation conditions

The site conditions determine whether the push-pull green board can be installed smoothly and used stably for a long time. Conducting a site survey prior to tendering can help avoid numerous changes and disputes during the construction phase.

Walls and load-bearing

It is necessary to clarify the type of wall structure, determine whether it is necessary to reinforce or use other installation schemes, confirm whether the wall state meets the hanging requirements, and check whether there is a hidden pipeline at the drilling location. Lightweight partition walls, hollow brick walls and gypsum board walls differ greatly from concrete walls in load-bearing capacity, and the selection of hanging schemes must be based on this.

Classroom Layout

It is necessary to confirm whether the classroom width and viewing distance, the installation position of the green board and the available wall width, the positional relationship between the platform and the door and the passage, the sliding direction of the green board are affected by these factors, and whether the teacher's operating height and writing range are appropriate. The sliding direction is blocked by the platform, or the door of the classroom is blocked after being pushed open, which is a common mistake in the actual project.

Power and Network

It is necessary to confirm the power supply requirements of the interactive panel, OPS and peripherals, the location and cable path of the power socket, the requirements of network access and screen projection, and whether new lines or socket modification is required. These should be aligned with the school logistics department prior to installation.

Heat dissipation and maintenance

It is necessary to confirm whether the green plate covers the ventilation opening of the flat plate after closing, whether the OPS heat dissipation and maintenance space is reserved, whether there is a ventilation gap between the green plate and the flat plate, and whether the parts can be easily inspected, cleaned and replaced in the later period.

After the site survey is completed, it is recommended to form a site survey table, classroom layout plan and installation conditions to be confirmed as part of the contract annex.

How to write 5. project acceptance

The acceptance should cover the green board itself, the interactive tablet, the installation quality and the teaching process, rather than just checking whether the equipment can be turned on.

Green board acceptance

It is necessary to check whether the size, color and material conform to the contract. Whether the length of the whole board is over 4000mm and the height is effectively matched with the interactive board; Whether the number, width and sliding stroke of the movable board meet the requirements; Whether a complete writing surface is formed after closing; Whether the sliding is smooth and the limit is effective; Whether it has anti-derailment and anti-pinch design; Whether writing is smooth and easy to erase; Whether anti-glare, anti-fingerprint and easy to clean. At the same time, check whether the gloss of the board surface is not higher than 12 gloss units, whether the formaldehyde emission is not higher than 0.2mg/L, whether the horizontal frame is not less than 57mm × 78mm, whether the vertical frame is not less than 29mm × 100mm, whether the width of the multi-purpose groove is not less than 30mm and does not affect sliding, whether the CASS 72H is not less than 10, whether the falling sand test is not less than 4000g, and the pulley life is not less than 100000 times, whether the lock can be locked reliably and the key is universal, whether the wrap angle is free of sharp burrs, and whether the limit gear is installed in place.

INTERACTIVE PLATE AND INSTALLATION ACCEPTANCE

It is necessary to check whether the model, size and accessories of the interactive tablet conform to the contract; Whether the opening of the green board matches the tablet; Whether the tablet is completely covered after closing; Whether the tablet is completely exposed after sliding open; Whether the display, touch and sound of the tablet are normal; Whether the OPS heat dissipation and maintenance space meet the requirements. In terms of installation, check whether the green board frame is stable, whether the track is level and firm, whether the sliding is smooth and does not block the channel, whether there is a safety gap between the green board and the flat board, whether the cables are clean and clearly marked, and whether the power supply and network are normal.

acceptance of teaching process

Equipment installed is not equal to use. The acceptance should arrange a complete teaching process test: whether the teacher can successfully complete the switching between blackboard writing and digital content, whether the blackboard writing is clear and easy to erase, whether the courseware, screen projection and annotation are normal, whether the video booth or recording and broadcasting system is normal, and whether the teacher can independently complete the complete operation of a class. It is recommended to complete teacher training concurrently and retain training records, operation cards, and instructions for the repair request process.

6. Supplier Response and Contract Attachments

The purchaser’s requirements shall only be binding when they are documented in verifiable form. It is suggested to require the supplier to provide the QM-HL4200 product parameter table and model data, the adaptation description of green board and interactive flat plate, installation manual and site investigation requirements, heat dissipation and maintenance space description, safety and environmental protection data, as well as GB28231-2011 and GB/T 5237.3 related test reports at the bidding stage. The test report or commitment letter for formaldehyde, CASS, falling sand and pulley life shall also be submitted. In addition, the quality assurance plan, spare parts supply and maintenance plan, and the scope of services for installation, training and acceptance need to be clearly stated.

In terms of contract attachments, it is recommended to include at least the following documents: push-pull green plate and interactive plate configuration list, size adaptation and opening size confirmation table, technical parameter response and deviation table, site investigation and installation condition confirmation table, heat dissipation and maintenance space requirements, installation training and acceptance service scope, quality assurance spare parts and maintenance responsibility table, and inspection report list.

In terms of scoring methods, the response degree of technical parameters, the completeness of test reports, the adaptation scheme of interactive flat plates, the ability of installation scheme and on-site investigation, the ability of after-sales and spare parts response, similar project cases, samples or on-site demonstrations can be taken as the main scoring dimensions. This approach not only filters out bids that fail to meet the specified criteria but also enables a comparison of proposal quality among qualified suppliers.

Conclusion

Smart classroom procurement push-pull green board, can't just look at the green board itself. It needs to cooperate with the interactive tablet, classroom layout, wall conditions and daily teaching process to really play a role. When preparing procurement documents, the education bureau and schools should clearly write down the size, track structure, safety design, environmental protection index, heat dissipation requirements and acceptance criteria of the QM-HL4200 one by one, and require suppliers to respond item by item according to specific classroom conditions. It is much cheaper to advance adaptation and acceptance to the bidding stage than to rectify problems found at the installation site.