2.8.1 Combination of experimental benches:
The integral test bench is inflexible and difficult to handle. If the whole experimental platform is divided into several small units and combined on site, this shortcoming can be avoided, but a lot of joints are generated on the table, and if the solution on the table is easy to flow down from the crack, it should be considered to use a larger unit to reduce Patchwork.
The wooden experimental platform assembled by the units can be moved out of some units for pipeline installation and maintenance. If the entire countertop is detached from the lower cabinet, the largest possible countertop can be placed directly on the cabinet combined by unit, which can reduce the seam.
The table of the experimental table should be combined with the whole table and the standard cabinet as much as possible to reduce the jointing of the table, ensure the overall appearance of the experimental table, facilitate debugging and improve the construction progress.
a) Width of knee extension notch: 600 ～ 1100mm
b) Reagent rack: It is appropriate to place two medium-sized reagent bottles (500ml) in parallel in depth. Usually 200 ～ 300mm, divided into two layers;
c) Take the reagent rack against the wall side table: 200mm
d) Reagent rack for central station: 300mm
2.8.2 The distance between the test benches and the fume hood The clearest distance between the test benches is at most 1300 mm, and 2-3 people can work in it, but sometimes special equipment needs to be considered in front of the test benches , Such as gas cylinders, refrigerators, etc., it is necessary to consider that there is a clear distance of 1600 to 1800 mm between the experimental stations. The necessary distance between the experimental table and the fume hood is generally set at 1250 mm for 2 people to pass through.
2.8.3 The scale of the laboratory bench requires the specifications of the chemical laboratory bench;
(1) Length The length of the test bench required by each experimenter varies greatly due to the different nature of the experiment. Experiments should generally consider 1200 mm per person (minimum should not be less than 1000 mm), and the organic chemistry experiment table must be considered longer, preferably 1400 ~ 1600 mm. The length of each person in the teaching laboratory in the United States is 1220 to 1750 mm. The length of the test bench required by the scientific research personnel should take into account the specific requirements of the scientific research personnel for the experiments they are engaged in. The United States is 3500 to 4000 mm per person, and Germany and Switzerland are 3000 mm per person.
(2) The height of the table top should generally be 850 mm high. If male experimenters account for a higher proportion, 900 mm can also be considered. For some special experimental work, it is also made lower, such as about 750 mm high. The height of the test rig in the United States and Germany is 900-920 mm, and in Japan it is 800 mm.
(3) Width The net width of each side of the experimental table should generally be considered to be 750 mm, and the minimum should not be less than 600 mm, and the width of the drug rack on the tabletop can be considered to be 200 to 300 mm wide. The American experimental bench has a clear width of 584 mm on each side and 1470 mm on both sides. The British double-sided experimental table is 1530 mm, the German double-sided experimental table is 1550-1700 mm, and the Japanese double-sided experimental table is 1500-1700 mm. We recommend 1500 mm for the double-sided experimental table and 650-850 mm for the single-sided experimental table .
2.8.4 Composition of a chemical experiment table A chemical experiment table is mainly composed of a table top and a stand or a cabinet under the table. In order to facilitate the experimental operation, a reagent rack, a pipeline box, a power socket or a water basin are often installed on the table .
(1) Pipeline channel, pipeline rack and pipeline box The pipeline service facilities on the experimental platform are usually introduced into the pipeline channel in the middle of the experimental platform from below the surface or from the pipeline well, and then led out to the table for use. The width of the pipeline channel is usually 300 to 400 mm, and the wall bench is 200 mm. If part of the unit of the test bench cannot be removed in full for pipeline inspection and repair in the test bench, the rear wall of the vessel cabinet should be made in a detachable construction. The pipeline outlet and power socket are usually directly connected to the table.
1. It is a form of pipeline rack. The pipelines can be long stacked on the table, and the bottom row is the water pipe. At the same time, a long drainage channel is provided in the middle of the experimental platform. This form is not simple in appearance, easy to accumulate dust on the horizontal tube, and the two sides of the test bench are separated by pipelines and cannot transfer items. The advantage is that the service supply is more convenient.
2. The pipeline service facilities are concentrated on several pipeline boxes to lead out the table, avoiding the shortcomings of the previous form, but in the design, pay attention to the use of each pipeline box can not be too large, otherwise the rubber guide tube is too long Prone to accidents.
3. In order to set up a long pipeline box on the experimental platform. It is more convenient to use and supply than the previous one, but reduces the effective net width of the test bench. If a reagent rack is provided above this line box, the two-sided experimental table is basically partitioned.
In the above-mentioned various methods, the power socket can be installed on the pipeline rack, pipeline box or medicine rack.
(2) Reagent rack The width of the reagent rack should not be too wide. It is advisable to be able to juxtapose two medium-sized reagent bottles (500ml). The usual width is 200-300 mm, and the reagent rack against the wall should be 200 mm. The reagent rack is usually divided into two layers of wooden, and the lower layer is left empty to allow the transfer of items between the drip basin and the two-sided experimental table. The upper layer can be provided with a glass sliding door on both sides or not. A small flange should be provided on the edge of the shelf to prevent the reagent bottle from being pushed down by the experimenter on the opposite side. If the medicine rack is made of metal pipes, the shelf can be made of lead glass or plastic. Reagent racks are sometimes used for more complicated experimental devices, so the structure of the reagent rack must be made stronger. A fluorescent lamp is sometimes added to the upper edge of the reagent rack, which is helpful for the experimenter to see the scale on the glass instrument.
(3) Utensil cabinet under the laboratory bench The space under the laboratory bench is usually equipped with a cabinet and a notch to extend the knee, which can not only hold the experimental supplies but also consider the need for the experimenter to sit by the laboratory bench for recording. Sometimes according to the needs of the experiment, some vessel cabinets can be designed as drying ovens with heat sinks or use the space under the table to place small vacuum pumps or small air compressors and other equipment.
The combination unit of the vessel cabinet separated from the table has greater flexibility than the overall combined experiment table. The combination of the cabinet under the stage can be selected according to the needs and usage habits of each experimenter. After the components are placed in place, the entire table is placed directly on each component. Such a table may have few or no seams, so this combination is ideal. It is not only conducive to factory production, but also to improve the progress of design and construction, and it can best adapt to changes in laboratory layout in the future, that is, it has great flexibility. Both the bulkhead and the rear wall in the standard assembly can be removed for pipeline inspection and repair.
Each experimental table can be left with one or two knee-extending notches under the table as needed. The width of the notch is 600 to 1100 mm. If this width is exceeded, the span of the table is too large, and it is necessary to add a transverse block or a middle pillar at the front . The height of the knee notch may be 800 mm (850 mm high test bench) to match the 625 mm test bench. In order to consider the standing of the experimenter, the kick part of the container cabinet must be retracted by about 40 mm to form a kick notch. The height of the kicking feet can be considered to be 100-120 mm. If it is necessary to prevent the ground water containing the chemical liquid from flowing into the bottom of the vessel cabinet, the ground anti-corrosion coil can be turned up and attached to the kicker, or the vessel cabinet components are not kicked. And kick bricks on the ground.
In addition, these types of components can also be used in mixed structure test benches. Each small component can be pushed directly under the stage, or there are small wheels under the small component. Therefore, the method of flexibly suspending the small cabinet under the steel support of the experimental table has emerged, which is 250 mm above the ground. This not only facilitates floor cleaning, but also has a lighter appearance, but its storage volume is correspondingly smaller than the floor-standing type. ,
(4) Drainage equipment of the experimental platform The drainage equipment of the experimental platform usually includes a washing basin, a countertop drip basin and a countertop drain. Wash basins are often made of plastic, glass fiber reinforced plastic and other integrated products, located at both ends of the experimental table. The sink can be installed on a cantilever or floor stand, and its height is usually 50 mm or less than the countertop. In order to make the end of the experimental table more tidy, there are also cabinet units with water basins at the end. When considering the teaching laboratory, in order to make up for the shortcomings of the peninsula-type central experimental table, there are also two at the end of the experimental table. A washing basin, or a washing basin in the middle, is not as ideal as it is at the end, because water is easily splashed on the table when washing, and it also hinders a long experimental device.
One or two small drip basins should be set on the experimental table according to the length of the experimental table, and its position is above the pipeline channel. The drip basin is mainly used to remove the liquid on the table or the liquid discharged from the experimental device and the faucet on the table. In order to facilitate the washing of the experimental platform, there is also a long drainage trough in the middle of the experimental platform to introduce water into the sink or directly drain it.
(5) Countertops The countertops are usually wooden countertops, natural granite, marble countertops, steel countertops and synthetic resin countertops. The countertop should be selected from the container cabinet below, and small flanges can be provided around the countertop to prevent the overflow of the medicinal solution when the countertop is flushed or the countertop; the countertop not considering the flushing can also be provided with no flange.
The countertop surface layer is required to have the advantages of being strong, smooth and seamless, impermeable to chemical liquids, not easy to break, not sensitive to heat or cold, not easy to break glassware and easy to maintain, but it is a comparison to find materials that can all meet these requirements difficult. Various colors can be used for the countertop, but black is more suitable for ordinary chemical laboratories, which makes the scales on glassware easy to see, and it is not easy to color itself; biochemical laboratories with bacteria should use white seamless countertops.
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