Site survey before installation of interconnected blackboard: wall, power supply, network and heat dissipation

Before the equipment arrives, site conditions will determine whether the project can be successfully implemented.

The problem with the interconnection blackboard project is often not that the equipment itself is unqualified, but that the site conditions and installation requirements are not up to standard. The wall did not bear enough weight and began to loosen after being installed for a period of time. The power socket was left behind the blackboard and could not be reached after closing. The network signal is full, but the screen cannot be connected. After the screen is embedded, the vent is covered and OPS frequently crashes in summer. After the teaching computer, video booth and recording and broadcasting system are connected, it is found that the interfaces do not match. Once these problems are exposed only after arrival, the cost of rework and additions is much higher than the half-day survey spent before installation.

Interactive blackboards typically integrate touch, display, recording, and networking functionalities into a traditional blackboard, enabling chalk-based writing while seamlessly incorporating teaching equipment and software resources. Its installation is not as simple as hanging a blackboard, but taking into account the wall, power supply, network, heat dissipation and maintenance space. The on-site investigation is not a mere formality, nor is it the end of the wall surface width measured. It should be a systematic condition check, confirming clearly every factor that may affect the installation and use, and leaving written records and video data.

1. walls and load-bearing: can interconnected blackboards be safely fixed

The wall serves as the load-bearing foundation for the entire teaching wall. The weight of the connected blackboard is not just the blackboard itself, but also the interactive tablet, OPS, peripherals, frame and mounting bracket. These weights hang on the wall for a long time and also bear the dynamic loads caused by daily pushing, pulling and touching. The wall can not bear, directly related to the use of safety.

Wall information to be confirmed

First of all, it is necessary to find out the type of wall: load-bearing wall, hollow brick wall, lightweight partition wall, gypsum board wall, or steel structure wall. The fixing methods and carrying capacity of different types of walls vary greatly. Secondly, to confirm the wall thickness, material and surface state, check whether the wall is flat, whether there are cracks, water seepage, empty drum or fall off. Whether there is a hidden pipeline at the drilling position needs to be checked in advance with a wall detector to avoid hitting wires or water pipes. If the wall conditions do not meet the installation requirements, but also to determine whether the need for reinforcement, or switch to other options such as floor brackets.

Bearing Verification

The weight of the whole teaching wall needs to be clearly calculated for the load-bearing verification: the total weight of the interconnected blackboard, the weight of the interactive tablet, the weight of OPS and peripherals, and the weight of the track and frame. In addition to these static weights, consider the dynamic loads that occur when sliding or pushing and pulling. Whether the wall can bear the load must be assessed by qualified professionals, who shall issue a written opinion. If reinforcement is confirmed to be necessary, it must also be further clarified who will prepare the reinforcement plan, who will carry out the construction, and who will bear the associated costs. If these three matters are not clearly specified in the contract, disputes are likely to arise during the construction phase.

2. Power and Cables: Not Just "There's a Socket Nearby"

Power supply preparation is most easily simplified as "there are sockets in the classroom". In actual projects, socket location, quantity, power, power failure mode and cable path will all affect installation and use. Interconnected blackboard, OPS, teaching computer, video booth, recording and broadcasting system and sound reinforcement equipment all need power supply. If the socket is not located correctly, the cable will be exposed, which will not only affect the beauty but also have potential safety hazards.

Power Verification

It is necessary to confirm the power supply requirements of interconnected blackboards, OPS and peripherals, the location, quantity and height of power sockets, whether the power supply is convenient for power failure and maintenance, whether new lines or sockets need to be modified, and whether UPS, surge protection or centralized power management is involved. Special attention should be paid to whether the power socket will be blocked after the interconnection blackboard is closed, and whether the lock position will affect the operation of the power switch. If the socket is left behind the blackboard and cannot be reached after installation, daily power failure and maintenance will be very troublesome.

Cable planning

It is necessary to plan the cable path between the interconnected blackboard, OPS, teaching computer, video booth and recording and broadcasting system, and confirm whether the cable is squeezed or pulled, whether it can be checked and replaced after installation, whether it hinders traffic or moves the bracket operation, and whether the power supply and other connections are clearly marked. The cable shall go through the inside of the frame or special trunking as much as possible to avoid being exposed and being scratched by sliding parts. If the cable needs to be replaced or added later, the path design should leave a margin.

3. Network: Being able to surf the Internet does not mean being able to screen, teach and record.

The Web is the most underrated part of the Connected Blackboard project. Many schools think that if there are Wi-Fi in the classroom, they can screen, attend classes, and record and broadcast. The actual situation is far from that simple. Screen protocol, device discovery, port restriction, proxy authentication, external service dependency, any one is not satisfied, will result in the function can not be used.

List of functions first

Don't start with "how much network bandwidth", but first list what network functions this classroom needs: browsing and courseware access, wireless screen projection, teaching software and teaching platform, remote management and recording, video conference or remote classroom, software activation and update. Different functions have different requirements on the network. Screen projection values delay and multicast, recording and broadcasting values uplink bandwidth and stability, and remote management values port and authentication. Only after the function list is confirmed can the network requirements be put forward in a targeted manner.

Request network requirements from suppliers

It is recommended to require suppliers to specify: wired and wireless access methods, required services, domain names and ports, device discovery and connection conditions, proxy, certificate and authentication requirements, external service dependencies, and offline available range. These contents shall be written as an annex to the contract or part of the technical agreement. You can't just write "support wireless screen projection", but you should write clearly which protocols are supported, which ports need to be opened, and whether you need to connect to the external network.

Test in customer network

After the network requirements are obtained, they should be tested in the actual network environment of the school, not in the supplier's laboratory. Teachers, students and visitor terminals test separately, verify the connection and exit of the screen, test the teaching software, recording and broadcasting and remote classroom, verify the connection and update process of the management platform, and record the results and restrictions of different network areas. The problems found in the test should be clearly solved by whom: equipment problems, network problems, or policy configuration problems.

Division of responsibilities

The network part involves suppliers, customer IT and integrators. Vendors provide functional and network technical requirements, customer IT reviews access and security policies, and integrators complete configuration and testing within the agreed scope. If the responsibilities of the three parties are not clearly written, it is easy to pass the buck to each other when problems arise. It is recommended to specify the delivery content and acceptance criteria of each party in the annex to the contract.

4. heat dissipation and maintenance space: whether the interconnected blackboard can operate stably for a long time

After the screen is embedded in the interconnected blackboard, the heat dissipation and maintenance space are most easily ignored. During the acceptance of many projects, the equipment was operating normally. It was only in summer that OPS crashed frequently. When I opened it, I found that the air vent was tightly blocked by the blackboard, or the maintenance space was too small. If I changed OPS, I had to remove half of the wall.

Thermal Verification

It is necessary to confirm the location and number of heat dissipation ports of the interactive flat panel, the heat dissipation requirements of OPS, whether the ventilation ports are blocked after the screen is embedded in the interconnected blackboard, whether there is a ventilation gap between the interconnected blackboard and the flat panel, and whether additional heat dissipation or ventilation design is required. The specific clearance value shall be provided by the interactive panel manufacturer, and no uniform standard shall be applied. Whether there is heat source, direct sunlight or poor ventilation in the classroom also needs to be confirmed.

Inspection of maintenance space

It is necessary to confirm whether there is a maintenance space between the interconnected blackboard and the flat board, whether the OPS can be easily inspected, replaced or upgraded, whether the cable can be inspected, maintained or replaced, whether the interconnected blackboard affects the maintenance operation, and whether it is necessary to reserve an inspection door or movable board. The principle of the maintenance space is: easy inspection, cleaning and replacement of parts, do not need to remove the entire blackboard. If the space is insufficient, the maintenance cost will increase greatly.

5. Site Investigation Record and Responsibility Division

The findings of the on-site survey must be documented in writing to serve as the basis for the installation plan and the criteria for subsequent acceptance. It is recommended to record the following during the survey.

Site investigation tools and recording methods

For site investigation, it is recommended to carry a tape measure or laser rangefinder to measure wall width, height and track length. Level ruler or laser level meter to measure track levelness; Wall detector to check hidden pipelines and steel bars; Camera or mobile phone is used to photograph walls, corners, platforms, doors, passages, power sockets and net openings. The on-site record form shall be filled in on the spot, marking the problem points and items to be confirmed. The photo naming suggestion is unified as "classroom number + exploration item + date" to facilitate filing and subsequent search.

Allocation of responsibilities

Every problem found in the on-site investigation needs to be clearly defined who is responsible for solving it. The following table can be used as a reference for the division of responsibilities.

6. Key Points of Exploration for Different Classroom Types

The site conditions of ordinary classrooms, recording and broadcasting classrooms, ladder classrooms and training institutions are very different, and the focus of investigation is also different.

Ordinary classrooms are mainly composed of blackboard writing and daily courseware. The investigation focuses on wall bearing, power socket location, network stability and heat dissipation space. Recording and broadcasting classrooms have higher requirements on network, audio, camera and recording and broadcasting interface. It is necessary to confirm the collection methods of recording and broadcasting pictures, teachers' voices and classroom voices, and whether the interconnected blackboard pictures can enter the recording and broadcasting system. The amphitheatre has large space and long viewing distance, so it is necessary to give priority to confirming the display size, viewing angle, wall load bearing and rear row visibility. Training institution courses change frequently and may require mobile stands, wireless screen projection and flexible power network configuration. Laboratories and training rooms also need to consider video booth interfaces, corrosion-resistant environments and equipment protection.

Frequently Asked Questions

Why do you need to do on-site investigation before the installation of the interconnected blackboard? Because any mismatch between the wall, power supply, network, heat dissipation and maintenance space will become rework and addition after installation, and even affect the normal teaching use. Site investigation is to expose the problem in advance and the lowest cost solution.

What should you do if the walls are not structurally sufficient to bear the load? A qualified professional should assess whether reinforcement is necessary, or whether alternative solutions such as floor-mounted supports should be implemented. The reinforcement plan, the construction contractor, and the party responsible for bearing the costs shall be clearly specified in the contract. Lightweight partition walls, hollow brick walls, and gypsum board walls, in particular, must be confirmed in advance.

What if the power socket is hidden? If the socket is left behind the interconnection blackboard and cannot be reached after installation, daily power failure and maintenance will be very troublesome. During the survey, confirm whether the socket position needs to be adjusted and whether new lines or sockets need to be added. Electrical transformation should be completed by qualified professionals.

What if the network cannot support screen casting or teaching software? List clearly what network functions are needed, and then ask the supplier for specific network requirements, including protocol, port, domain name and authentication method. Then test in the actual network environment of the school to confirm whether the problem lies in the equipment, network or policy configuration, which will be solved by the corresponding responsible party.

How to dissipate heat after the screen is embedded in the interconnected blackboard? It is necessary to confirm the position of the heat dissipation port of the interactive flat panel and the heat dissipation requirement of OPS, whether the green board or blackboard is closed to cover the vent, and whether there is a ventilation gap. The specific values should be provided by the interactive flat panel manufacturer and cannot be based on a uniform standard.

How much maintenance clearance is required between the interactive blackboard and the tablet? There is no standardized value; it should be determined based on the interactive tablet model, the OPS replacement method, and the site conditions. The principle is to allow for easy inspection, cleaning, and replacement of components without having to disassemble the entire blackboard.

How to accept the interconnection blackboard after installation? The acceptance should cover three levels of arrival, installation and teaching process. Check the model, quantity, accessories and data after arrival; Installation and inspection of walls, tracks, power supply, network and heat dissipation; The teaching process tests whether blackboard writing, courseware, screen casting, annotation and storage are normal. It is recommended to complete teacher training simultaneously.

How to divide the responsibilities between the integrator and the engineer? It is suggested to specify the lead party, partner and deliverable in the contract, including site investigation, wall reinforcement, power supply modification, network configuration, peripheral adaptation, heat dissipation maintenance, installation connection and acceptance handover. Unclear responsibility is the main reason for project wrangling.

Conclusion

Before the installation of the interconnected blackboard, on-site investigation determines whether the project can be successfully landed. Integrators and engineers shall confirm the five conditions of wall and load bearing, power supply and cable, network and screen projection, heat dissipation and maintenance, and maintenance space, and convert the exploration results into verified engineering items and contract attachments. Addressing compatibility, thermal management, and maintenance during the pre-installation phase is far more cost-effective than performing rework or additional work after delivery. For the school, a complete on-site inspection record also serves as an important basis for subsequent acceptance, asset handover, and routine maintenance.