With the development of education informatization in China, especially the gradual implementation of classes and classes throughout the country, the multimedia projection teaching system has become more and more popular. As one of the products of this system, the steel multimedia platform has also gradually increased in recent years It is widely used in the education market.
Multimedia podium is a product that integrates podium with computer, multimedia control system, video booth, audio equipment, audio-video converter and other electronic products. As an emerging product, the current industry concentration is low. Due to factors such as large size, heavy weight, and inconvenient transportation, the multimedia platform is still a regional product. According to incomplete statistics, there are currently 244 multimedia platform enterprises in the country, and the industry's cumulative industrial output value is 370 million yuan. The output value of the top 20 large-scale enterprises only accounts for 23.63% of the country's total. 10,000 units, domestic sales of 59,000 units.
From the perspective of the entire industry, the current multimedia platform market is full of fishes and dragons, with uneven product quality and worrying quality. This is mainly manifested in the fact that some small workshop-like or even illegal underground factory products are flooding the market, and most enterprises lack innovation and quality awareness. For example, some products with obvious defects in structure and poor quality are still being sold to the market, resulting in steel products that should be durable but currently have a high failure rate.
The main reasons for the above status quo are:
1. Manufacturer:
The multimedia platform industry is still in the initial stage of development. The relevant production enterprises are small and medium-sized labor-intensive enterprises, with relatively low scale, equipment, technology, and quality of employees. They lack quality and innovation awareness; especially in bidding activities. Due to the importance and guiding role of price, some companies are blindly pursuing low prices in order to win the bid, causing them to continuously reduce product costs, neglecting product quality construction, and reluctant to invest in product upgrades and transformations. Just flood the market.
Second, the majority of users:
Multimedia podium is still a new product, and it has not been widely used by users. The user has insufficient experience. Most users mistakenly believe that the steel one must be strong and durable; in addition, the multimedia podium accounts for the proportion of the price in the multimedia projection system. Not large, so the attention is relatively low in the bidding process, and it is easy to be ignored. In addition, the tender site often does not provide samples, and the user does not compare and judge the object, so it often leads to user judgment errors.
In view of this, it is necessary to give a brief introduction on how to judge the advantages and disadvantages of the multimedia platform.
1. The main classification and characteristics of multimedia podiums:
1. Lecture table type:
The length of this type is generally not more than 1100mm, the height is below the bottom edge of the blackboard (approximately 900mm), and the width is between 650mm-700mm. It is similar to a lecture table. It can be used for desktop computers, notebook computers, video booths, central control, power amplifiers, etc. The equipment has a small size, occupies less space on the bottom of the classroom, and has a beautiful appearance. Because it is a newly developed product, the structure is relatively reasonable, easy to use, the failure rate is low, and the price is relatively moderate. At present, many universities have begun to use a large number of them and they are well-received. It is a trend in the development of multimedia platforms, and it is more suitable for class-to-class projects.
2. Flip-up type:
The opening form of the upper cover door adopts the flip-up type. This type generally has two specifications of 1200mm and 1400mm, the height is below the bottom edge of the blackboard (about 900mm), the width is between 600mm-700mm, the narrower the width takes up the classroom platform The smaller the space, the more reasonable the design. The price of this type of product is relatively reasonable. It is one of the products with the largest sales in recent years.
3. Left and right horizontal push (pull) type:
The opening of the door adopts the form of pushing (pulling) horizontally to the left and right sides. This type generally has two specifications of 1200mm and 1400mm, the height is below the bottom edge of the blackboard (about 900mm), and the width is between 700mm-750mm. The narrower the space occupied by the classroom podium, the more reasonable the design. The price of this type of product is relatively high. In the past, the university used it relatively more. It is one of the products that has sold more in recent years.
2. The main structural design defects in the multimedia platform:
As shown in the figure below (long horizontal push-pull type around 1200mm):
The upper door is made of steel and has a heavy weight. After being pushed open, there are two parts that support it. One is the upper front end, which serves as the main support and guide, and the other is the middle slide, which serves as auxiliary support and guide. Function, if the front end of the upper part is used as the main support and guide function, the slide path will be used, and the following conditions will occur after a period of use:
1) The two wings collapse after being pushed away (as shown in the figure), the slide rail deforms after a period of use, and it is difficult to push and pull;
2) After being pushed away, the two wings cannot withstand large downward pressure, otherwise the slideway will be damaged and cause danger;
3) After being pushed away, the two wings are not firmly fixed horizontally. If the power is slightly swayed, the slideway will be damaged;
4) When the door is closed, due to the inaccurate left and right control guidance, the latch tongue and the lock hole of the latch are prone to impact,
There is a high probability of damage to the lock.
To solve the above problem, the slideway at the front end of the upper part needs to be replaced with a linear split-pull bearing. One is that the support strength is great, which can fully meet the daily use, and the other is to play a precise navigation role to avoid damage to the lock. Although the cost is slightly increased, the quality of the product is guaranteed (as shown in the figure below):
1. The product as shown in the figure below (the opening method of the upper cover adopts the design of the push-up and forward push):
When opening, the user has to flip up the two upper doors, and then fold out and push forward through the slide rails on both sides. This structure has the following defects:
1). The two upper doors are too heavy to be turned over, especially the female teacher can hardly turn it over. When opening, it is easy to rub the baffles on both sides and scratch the surface.
2) When pushing forward after opening, the two sides must be the same force, otherwise it cannot be pushed out, and the upper cover is extended too long after being pushed out, which can reach 350mm. If the student sits close to the front of the multimedia platform, the upper cover door is pushed to the student In front of the multimedia platform, if the front of the multimedia platform is an aisle, students will be easily bumped when running back and forth during class, causing potential safety hazards.
3) Generally, after using this structure for one year, many slides will be damaged, and the damage rate is higher.
1. Where the multimedia platform is prone to problems:
In addition to the unreasonable structural design causing hidden quality problems, the following parts are prone to problems:
1), hinge:
Because the hinge is a movable connector, the heavy and frequently opened use characteristics require that the plate for fixing the hinge must be strengthened, and that a high-strength hinge must be used, and the price of the high-strength hinge is much higher, so many The manufacturers did not adopt it, but used small, cheap hinges, and the result was that they started to be damaged within one year of use (as shown):
2), slide way:
Mainly reflected in the size, thickness, strength and technology of the slideway used, the price gap is also large, good slideways are durable, and bad slideways often have problems.
3), door lock:
The design structure of the lock is very different, the quality gap is large, and the price is the same. The selection of locks with different structures and quality directly affects the quality of this product.
4). Roughly manufactured during processing, the product is de-soldered due to virtual welding or false welding.
5). The spraying process is poor, but the quality is not high enough, the surface will fall off after a period of use.
1. Criteria for judging the quality of the multimedia platform:
Many people regard the thickness of the product sheet as the most important criterion for judging the quality of the multimedia platform. This is actually a misunderstanding. In fact, what the user really wants is the strength of the product rather than the weight of the product. Practice has proved that the strength of the product will be greatly increased with the use of ribs scientifically. For example, a product produced with 1.2mm cold-rolled steel plates, if the design of ribs is scientifically adopted, its product strength exceeds the strength of the product produced with 1.5mm cold-rolled steel plates. Therefore, scientific processing improves the strength of the product while reducing the weight of the product, and at the same time reduces the user's cost of use. This should be worthy of user attention. In addition, it should also be noted:
1). The use of high-quality cold-rolled steel plate, fully enclosed structure, dustproof, anti-theft, fireproof, moisture-proof, good heat dissipation, the surface is pickled and phosphated, electrostatic sprayed and other processes, smooth and beautiful;
2). The structural design is reasonable, and there is no protrusion after the product is turned on. The horizontal split split-pull structure must adopt a linear split-pull bearing design. Computers, monitors, laptops, central control, video booths, power amplifiers, teaching plans and other related equipment and The items can be placed reasonably to meet the user's requirements;
3) The quality of accessories is guaranteed, and accessories should be well-known brand products in the industry. The upper door hinge should use 4 sets of 4 cross hidden hinges per group (specific reference specification: 69mm * 46mm, material: zinc alloy); the slideway should use high-strength three-fold slideway (specific reference specification: 22 " , Material: cold-rolled steel plate, material thickness: 1.2mm); bearings should be linear split-pull bearings with a diameter not less than 16mm.
4). The product processing accuracy is high, the gap between the contact surfaces of each board surface is not more than 2mm and evenly distributed, the lock and hinge mounting holes are processed by molds, and the gap between the accessories is not more than 1mm;
5). The doors and moving parts are flexible and smooth, easy to open and close; there is a sealed design at the gap of the upper cover to prevent chalk dust from falling into the interior; there are grounding screws and internal wiring groove design.
6). The surface treatment is smooth without bumps, the mold does not fall off, and has a texture. This can be felt by touching and contrasting by hand. The good treated surface feels thick and greasy, and the bad treated surface feels directly to the steel plate.
7). Complete supporting parts. There are optional supporting heightened base, chalk box, integrated multi-function junction box or junction board, etc., which is convenient for external devices such as notebook computers.
It is worth mentioning that although there are many problems in the multimedia platform, there are also some companies whose products stand out among the many products. I believe that as the market continues to advance, more and more good products will be provided to the majority of users.
Source: Banbantong China Network
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