CN111701634A

CN111701634A - Laboratory bench for chemistry experiments

Info

Publication number: CN111701634A
Application number: CN202010636119.3A
Authority: CN
Inventors: 徐宸轩
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-07-03
Filing date: 2020-07-03
Publication date: 2020-09-25
Anticipated expiration: 2040-07-03
Also published as: CN111701634B

Abstract

The invention belongs to the technical field of experiment tables, and particularly relates to an experiment table for a chemical experiment, which comprises an operation table; the top of the operating platform is provided with a faucet and a water tank, the bottom of the water tank is provided with a disc, the disc is fixedly connected with a brush rod, and the bottom of the brush rod penetrates through the circle of the water tank and extends to the lower part of the water tank; the bottom of the brush rod is driven by a motor fixedly connected with the water tank; a group of bristles are uniformly arranged on the upper part of the brush rod; a pair of symmetrically arranged brackets is fixedly connected in the water tanks at the two sides of the disc, a sliding rod is connected in a sliding groove formed in each bracket in a sliding manner, and a spring is arranged between each sliding rod and the bottom of the corresponding sliding groove; one end of the sliding rod, which is close to the brush rod, is fixedly connected with an arc-shaped elastic rod, and the elastic rod is used for clamping and fixing the test tube; according to the invention, the brush rod is driven to rotate by the motor, so that the cleaning efficiency of the test tube is increased.

Description

Laboratory bench for chemistry experiments

Technical Field

The invention belongs to the technical field of experiment tables, and particularly relates to an experiment table for a chemical experiment.

Background

Chemistry is a natural science, and the composition, properties, structure and change rules of substances are researched on the molecular and atomic level; creating the science of new substances. The world is composed of substances, and chemistry is one of the main methods and means used by humans to recognize and reform the substance world. It is a long-standing and energetic subject, and its achievement is an important sign of social civilization, and there are two kinds of change forms of chemical change and physical change in chemistry.

The experiment table is used for the experimental detection and instrument storage of enterprises and institutions such as hospitals, schools, chemical plants, scientific research institutions and the like.

Some technical schemes related to the experiment table also appear in the prior art, for example, a chinese patent with application number 2017114661874 discloses an experiment table for chemical teaching, which comprises an operation table, a first support, a bottom plate, a cleaning mechanism, a box body and the like; the left side and the right side of the bottom of the operating platform are symmetrically provided with first supports, the bottom of each first support is provided with a bottom plate, the left of the operating platform is provided with a cleaning mechanism, the cleaning mechanism is located on the right side of the first support on the left, and the right side of the bottom of the operating platform is provided with a box body. The invention achieves the effects of conveniently cleaning the equipment, drying the equipment and accelerating the air circulation on the surface of the experiment table, and the blade is driven to work by the work of the motor, thereby achieving the purpose of saving energy, being beneficial to the chemical experiment, and the handle can facilitate the teachers to rotate the operation board; however, in the prior art, the test tube needs to be cleaned after being subjected to a chemical experiment, so that residual experiment reagents and precipitates adhered to the inner wall of the test tube can be removed, the test tube is kept clean, interference to the next chemical experiment is avoided, in the prior art, manual cleaning is performed through a test tube brush, the cleaning efficiency is low, the labor intensity is high, and meanwhile, if toxic and harmful substances are remained in the test tube, accidental injuries are easily caused.

Therefore, the novel experiment table for the chemical experiment is provided, the opening of the test tube is clamped tightly through the elastic rod matched with the sliding rod and the spring, then the inner wall of the test tube is quickly cleaned through rotation of the brush bristles, the cleaning efficiency of the test tube is increased, and accidental injuries are reduced.

Disclosure of Invention

In order to make up for the defects of the prior art, the experiment table for the chemical experiment is used for solving the problems that in the prior art, a test tube needs to be cleaned after being subjected to the chemical experiment so as to remove residual experiment reagents and precipitates adhered to the inner wall of the test tube, keep the test tube clean and avoid interference on the next chemical experiment, in the prior art, the test tube is manually cleaned through a test tube brush, the cleaning efficiency is low, the labor intensity is high, and meanwhile, if toxic and harmful substances remain in the test tube, accidental injury is easily caused.

The technical scheme adopted by the invention for solving the technical problems is as follows: the experiment table for the chemical experiment comprises an operation table; the top of the operating platform is provided with a faucet and a water tank, the bottom of the water tank is provided with a disc, the disc is fixedly connected with a brush rod, and the bottom of the brush rod penetrates through the circle of the water tank and extends to the lower part of the water tank; the bottom of the brush rod is driven by a motor fixedly connected with the water tank; a group of bristles are uniformly arranged on the upper part of the brush rod; a pair of symmetrically arranged supports is fixedly connected in the water tanks at two sides of the disc, a sliding rod is connected in a sliding groove formed in each support in a sliding manner, and a spring is arranged between each sliding rod and the bottom of the corresponding sliding groove; one end of the sliding rod, which is close to the brush rod, is fixedly connected with an arc-shaped elastic rod, and the elastic rod is used for clamping and fixing the test tube; the brush rod is driven to rotate by the motor, so that the cleaning efficiency of the test tube is improved; during operation, the test tube in the prior art needs to be cleaned after being subjected to a chemical experiment, so that residual experiment reagents and precipitates adhered to the inner wall of the test tube can be removed, the test tube is kept clean, and interference to the next chemical experiment is avoided.

Preferably, a hose is arranged in the brush rod and is communicated with the air pump through a distribution valve; a group of spray pipes are uniformly distributed on the periphery of the brush rod, and the spray pipes are communicated with the hose; cooling air is sprayed out through the spray pipe to cool the test tube, so that the test tube is prevented from being damaged by quenching; establish on the brush-holder stud when the test tube cover to after fixing through the elastic rod, drive the brush hair through the motor and clear up the test tube, when test tube temperature is higher, through control distribution valve, and then make and fill into cooling air in the hose, make cooling air through the spray tube blowout, utilize the air to slowly reduce test tube temperature, avoid hot test tube and cold water suddenly contact to make the temperature suddenly drop and explode and split, damage the test tube and cause unexpected injury, guarantee the safe quick cleaning operation of test tube.

Preferably, the brush rod is provided with an air bag near the upper part, and the spray pipe is connected with the air bag in a sliding and sealing manner; the electromagnetic valve is arranged in the spray pipe, and the spray pipe penetrates through the air bag and extends into the air bag; the inner wall of the air bag is fixedly connected with a valve body at a position corresponding to the spray pipe, and the spray pipe is connected with a valve hole formed in the valve body in a sliding and sealing manner; a spring is arranged between the spray pipe and the bottom of the valve hole, and a first hole is formed in the middle of the spray pipe along the diameter direction of the cross section of the spray pipe; an air inlet hole and an air outlet hole are formed in the valve body corresponding to the first hole, the air inlet hole is communicated with the hose, and the air outlet hole is communicated with the interior of the air bag; when the spray pipe slides in the air bag after being pressed, the first hole is disconnected and communicated with the air inlet and the air outlet; the expansion size of the air bag is controlled through the spray pipe, so that the air bag is suitable for cleaning test tubes with different inner diameters; when the test tubes with different inner diameters need to be cleaned, the bristles cannot well scrape and clean the inner walls of the test tubes due to the fixed length of the bristles, the air is supplied into the hose by controlling the distribution valve, meanwhile, the spray pipe is cut off by the electromagnetic valve, so that the compressed air in the hose is filled into the air bag after passing through the air inlet hole, the first hole and the air outlet hole, the diameter of the air bag is increased after the air bag is expanded, so that the bristles and the spray pipe expand towards the periphery of the brush rod, after the spray pipe contacts the inner wall of the test tube, the spray pipe slides towards the inside of the air bag after being extruded by the test tube, the sliding spray pipe enables the first hole to be disconnected and communicated with the air inlet hole and the air outlet hole, and then make the gasbag stop to fill compressed air and stop the inflation, and then make the brush hair support the test tube inner wall, later drive the brush-holder stud rotation and clear up the test tube through the motor, further increase the cleaning performance of different diameter test tubes.

Preferably, the air bags are cylindrical, and a plurality of air bags are arranged side by side along the axial direction of the brush rod; the cleaning efficiency is improved by arranging a plurality of air bags to be suitable for cleaning the container with gradually changed section shapes; through the gasbag of a plurality of settings for the gasbag adapts to the container of different internal diameters, makes gasbag inflation diameter different simultaneously, makes adaptation container inner wall profile after the gasbag inflation, increases the cleaning efficiency to the container of cross sectional shape gradual change such as flask.

Preferably, the brush rod is rotatably connected with a vertical rod, the upper part of the vertical rod is fixedly connected with a group of telescopic rods corresponding to the air bag, the inner wall of the air bag is provided with a wave groove corresponding to the telescopic rods, and one end of each telescopic rod, which is far away from the vertical rod, is embedded into the wave groove and is in sliding connection with the wave groove; a first magnetic block is fixedly connected to the lower part of the upright rod at a position corresponding to the elastic rod, and a second magnetic block is arranged on the elastic rod at a position corresponding to the first magnetic block; the first magnetic block is matched with the second magnetic block and the telescopic rod, so that the vertical creeping of the air bag is increased, and the cleaning efficiency is further increased; when the brush hair constantly rotates and washs the test tube inner wall under the drive of brush-holder stud, because the pole setting rotates with the brush-holder stud to be connected, the spacing action of No. two magnetic paths of cooperation to a magnetic path makes pole setting and brush-holder stud form the difference in rotation speed, and then makes the pole setting drive the telescopic link and slide along the wave groove, and then makes the gasbag produce the continuous wriggling of vertical direction, further increases the cleaning efficiency to the test tube of brush hair.

Preferably, the distribution valve is communicated with the water pump through a pipeline; the inner wall of the air bag is inlaid with an annular steel wire which is in a loose state, and the deformation of the air bag is limited by the steel wire, so that the damage of the air bag is reduced; after the bristles rotate and clean the test tube, high-pressure water is filled into the hose by controlling the distribution valve, and meanwhile, the electromagnetic valve is opened, so that compressed air in the air bag is mixed with high-pressure water flowing into the spray pipe through the hose and the air inlet pipe, the high-pressure water is sprayed out of the spray pipe after being atomized, the inner wall of the test tube is further washed, and the cleaning efficiency of the test tube is further improved.

The invention has the following beneficial effects:

1. according to the experiment table for the chemical experiment, the opening of the test tube is clamped tightly by the elastic rod matched with the sliding rod and the spring, then the brush rod is driven to rotate by the motor, so that the bristles are driven to rotate and the inner wall of the test tube is quickly cleaned, the cleaning efficiency of the test tube is increased, the manual labor intensity is reduced, and the accidental injury is reduced.

2. According to the experiment table for the chemical experiment, the distribution valve is controlled to inflate the air bag, the diameter of the expanded air bag is increased, the bristles and the spray pipe are further expanded towards the periphery of the brush rod to abut against the inner wall of the test tube, the brush rod is driven to rotate through the motor to clean the test tube, and the cleaning effect of the test tubes with different diameters is further improved.

Drawings

The invention will be further explained with reference to the drawings.

FIG. 1 is a perspective view of the present invention;

FIG. 2 is a schematic view of the construction of the brush bar and the holder;

FIG. 3 is an enlarged view of a portion of FIG. 1 at A;

FIG. 4 is an enlarged view of a portion of FIG. 2 at B;

FIG. 5 is a cross-sectional view taken at C-C of FIG. 4;

in the figure: the water faucet comprises an operating platform 1, a water faucet 11, a water tank 12, a disc 13, a brush rod 14, a motor 15, a support 16, a sliding groove 17, a sliding rod 18, an elastic rod 19, a hose 2, a spraying pipe 21, an air bag 22, a valve body 23, a valve hole 24, a first hole 25, an air inlet 26, an air outlet 27, an upright rod 3, a telescopic rod 31, a wave groove 32, a first magnetic block 33, a second magnetic block 34 and a steel wire 35.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

As shown in fig. 1 to 5, the laboratory table for chemical experiments according to the present invention includes a table 1; a faucet 11 and a water tank 12 are arranged at the top of the operating platform 1, a disc 13 is arranged at the bottom of the water tank 12, a brush rod 14 is fixedly connected to the disc 13, and the bottom of the brush rod 14 penetrates through the circle of the water tank 12 and extends to the lower part of the water tank 12; the bottom of the brush rod 14 is driven by a motor 15 fixedly connected with the water tank 12; a group of bristles are uniformly arranged on the upper part of the brush rod 14; a pair of symmetrically arranged supports 16 are fixedly connected in the water tanks 12 at two sides of the disc 13, a sliding chute 17 arranged in each support 16 is connected with a sliding rod 18 in a sliding manner, and a spring is arranged between each sliding rod 18 and the bottom of each sliding chute 17; one end of the sliding rod 18, which is close to the brush rod 14, is fixedly connected with an arc-shaped elastic rod 19, and the elastic rod 19 is used for clamping and fixing a test tube; the brush rod 14 is driven to rotate by the motor 15, so that the cleaning efficiency of the test tube is improved; during operation, the test tube in the prior art needs to be cleaned after being subjected to a chemical experiment, so that residual experiment reagents and precipitates adhered to the inner wall of the test tube can be removed, the test tube is kept clean, and interference to the next chemical experiment is avoided.

As an embodiment of the invention, a hose 2 is arranged in the brush rod 14, and the hose 2 is communicated with an air pump through a distribution valve; a group of spray pipes 21 are uniformly distributed on the periphery of the brush rod 14, and the spray pipes 21 are communicated with the hose 2; cooling air is sprayed out through the spray pipe 21 to cool the test tube, so that the test tube is prevented from being damaged by quenching; establish on brush-holder stud 14 when the test tube cover to after fixing through elastic rod 19, drive the brush hair through motor 15 and clear up the test tube, when test tube temperature is higher, through control distribution valve, and then make and fill into cooling air in hose 2, make cooling air through spray tube 21 blowout, utilize the slow test tube temperature that reduces of air, avoid hot test tube and cold water suddenly contact to make the temperature suddenly drop and explode and split, damage the test tube and cause unexpected injury, guarantee the safe quick cleaning operation of test tube.

As an embodiment of the invention, the brush rod 14 is provided with an air bag 22 near the upper part, and the spray pipe 21 is connected with the air bag 22 in a sliding and sealing way; an electromagnetic valve is arranged in the spray pipe 21, and the spray pipe 21 penetrates through the air bag 22 and extends into the air bag 22; the inner wall of the air bag 22 is fixedly connected with a valve body 23 at a position corresponding to the spray pipe 21, and the spray pipe 21 is connected with a valve hole 24 arranged in the valve body 23 in a sliding and sealing manner; a spring is arranged between the spray pipe 21 and the bottom of the valve hole 24, and a first hole 25 is formed in the middle of the spray pipe 21 along the diameter direction of the cross section of the spray pipe 21; an air inlet 26 and an air outlet 27 are arranged on the valve body 23 at positions corresponding to the first hole 25, the air inlet 26 is communicated with the hose 2, and the air outlet 27 is communicated with the inside of the air bag 22; when the nozzle 21 slides into the air bag 22 after being pressed, the first hole 25 is disconnected from the air inlet hole 26 and the air outlet hole 27; the expansion size of the air bag 22 is controlled through the spray pipe 21, so that the test tube cleaning machine is suitable for cleaning test tubes with different inner diameters; when test tubes with different inner diameters need to be cleaned, the bristles cannot scrape and clean the inner walls of the test tubes well due to the fact that the lengths of the bristles are fixed, air is supplied into the hose 2 through the control distribution valve, the spray pipe 21 is cut off through the electromagnetic valve, compressed air in the hose 2 is filled into the air bag 22 through the air inlet 26, the first hole 25 and the exhaust hole 27, the diameter of the air bag 22 is increased after the air bag 22 is expanded, the bristles and the spray pipe 21 are expanded towards the periphery of the brush rod 14, the spray pipe 21 slides towards the interior of the air bag 22 after being extruded by the test tubes after contacting with the inner walls of the test tubes, the first hole 25 is communicated with the air inlet 26 and the exhaust hole 27 through the sliding spray pipe 21, the air bag 22 stops being filled with the compressed air and stops expanding, the bristles abut against the inner walls of the test tubes, and then the brush rod 14 is driven by the, further increasing the cleaning effect of test tubes with different diameters.

As an embodiment of the invention, the air cell 22 is cylindrical, and a plurality of air cells 22 are arranged side by side along the axial direction of the brush rod 14; the cleaning efficiency is improved by arranging a plurality of air bags 22 to be suitable for cleaning containers with gradually changed cross-sectional shapes; through a plurality of gasbags 22 that set up for gasbag 22 adapts to the container of different internal diameters, makes gasbag 22 inflation diameter different simultaneously, makes gasbag 22 adapt to container inner wall profile after the inflation, increases the cleaning efficiency to the container of the equal cross-sectional shape gradual change of flask.

As an embodiment of the invention, the brush rod 14 is rotatably connected with the upright rod 3, the upper part of the upright rod 3 is fixedly connected with a group of telescopic rods 31 at positions corresponding to the air bags 22, the inner wall of the air bags 22 is provided with wave grooves 32 at positions corresponding to the telescopic rods 31, and one ends of the telescopic rods 31 far away from the upright rod 3 are embedded into the wave grooves 32 and are in sliding connection with the wave grooves 32; a first magnetic block 33 is fixedly connected to the lower part of the upright rod 3 corresponding to the elastic rod 19, and a second magnetic block 34 is arranged on the elastic rod 19 corresponding to the first magnetic block 33; the first magnetic block 33 is matched with the second magnetic block 34 and the telescopic rod 31, so that the vertical creeping of the air bag 22 is increased, and the cleaning efficiency is further increased; when the brush hair constantly rotates and washs the test tube inner wall under the drive of brush-holder stud 14, because pole setting 3 rotates with brush-holder stud 14 to be connected, the limiting displacement of No. two magnetic paths 34 to magnetic path 33 of cooperation makes pole setting 3 and brush-holder stud 14 form the difference in rotation speed, and then makes pole setting 3 drive telescopic link 31 and slide along wave groove 32, and then makes gasbag 22 produce the continuous wriggling of vertical direction, further increases the cleaning efficiency to the test tube of brush hair.

As an embodiment of the invention, the distribution valve is communicated with the water pump through a pipeline; an annular steel wire 35 is embedded in the inner wall of the air bag 22, the steel wire 35 is in a loose state, the deformation of the air bag 22 is limited through the steel wire 35, and the damage to the air bag 22 is reduced; after the bristles rotate and clean the test tube, high-pressure water is filled into the hose 2 by controlling the distribution valve, and meanwhile, the electromagnetic valve is opened, so that compressed air in the air bag 22 is mixed with the high-pressure water flowing into the spray pipe 21 through the hose 2 and the air inlet pipe, the high-pressure water is sprayed out from the spray pipe 21 after being atomized, the inner wall of the test tube is further washed, and the cleaning efficiency of the test tube is further improved.

During operation, a test tube in the prior art needs to be cleaned after a chemical experiment is performed, so that residual experiment reagents and precipitates adhered to the inner wall of the test tube can be removed, the test tube is kept clean, and interference to the next chemical experiment is avoided; when the test tube is sleeved on the brush rod 14 and is fixed through the elastic rod 19, the brush bristles are driven by the motor 15 to clean the test tube, when the temperature of the test tube is high, the distribution valve is controlled to further enable the hose 2 to be filled with cooling air, so that the cooling air is sprayed out through the spray pipe 21, the temperature of the test tube is slowly reduced by using the air, the test tube is prevented from being exploded due to sudden temperature drop caused by sudden contact of hot test tube and cold water, the test tube is prevented from being damaged, accidental injury is caused, and safe and rapid cleaning operation of the test tube is ensured; when test tubes with different inner diameters need to be cleaned, the bristles cannot scrape and clean the inner walls of the test tubes well due to the fact that the lengths of the bristles are fixed, air is supplied into the hose 2 through the control distribution valve, the spray pipe 21 is cut off through the electromagnetic valve, compressed air in the hose 2 is filled into the air bag 22 through the air inlet 26, the first hole 25 and the exhaust hole 27, the diameter of the air bag 22 is increased after the air bag 22 is expanded, the bristles and the spray pipe 21 are expanded towards the periphery of the brush rod 14, the spray pipe 21 slides towards the interior of the air bag 22 after being extruded by the test tubes after contacting with the inner walls of the test tubes, the first hole 25 is communicated with the air inlet 26 and the exhaust hole 27 through the sliding spray pipe 21, the air bag 22 stops being filled with the compressed air and stops expanding, the bristles abut against the inner walls of the test tubes, and then the brush rod 14 is driven by the, the cleaning effect of test tubes with different diameters is further improved; through the multiple arranged air bags 22, the air bags 22 are adaptive to containers with different inner diameters, meanwhile, the expansion diameters of the air bags 22 are different, the air bags 22 are adaptive to the contour of the inner wall of the container after being expanded, and the cleaning efficiency of the container with the constant section shape of the flask gradually changed is increased; when the bristles are driven by the brush rod 14 to continuously rotate and clean the inner wall of the test tube, the upright rod 3 is rotatably connected with the brush rod 14 and is matched with the limiting effect of the second magnetic block 34 on the first magnetic block 33 to enable the upright rod 3 and the brush rod 14 to form a rotating speed difference, so that the upright rod 3 drives the telescopic rod 31 to slide along the wave groove 32, the air bag 22 is enabled to continuously creep in the vertical direction, and the cleaning efficiency of the bristles on the test tube is further improved; after the bristles rotate and clean the test tube, high-pressure water is filled into the hose 2 by controlling the distribution valve, and meanwhile, the electromagnetic valve is opened, so that compressed air in the air bag 22 is mixed with the high-pressure water flowing into the spray pipe 21 through the hose 2 and the air inlet pipe, the high-pressure water is sprayed out from the spray pipe 21 after being atomized, the inner wall of the test tube is further washed, and the cleaning efficiency of the test tube is further improved.

The front, the back, the left, the right, the upper and the lower are all based on figure 1 in the attached drawings of the specification, according to the standard of the observation angle of a person, the side of the device facing an observer is defined as the front, the left side of the observer is defined as the left, and the like.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the scope of the present invention.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A laboratory bench for chemistry experiments which characterized in that: comprises an operation table (1); a faucet (11) and a water tank (12) are arranged at the top of the operating platform (1), a disc (13) is arranged at the bottom of the water tank (12), a brush rod (14) is fixedly connected to the disc (13), and the bottom of the brush rod (14) penetrates through the circle of the water tank (12) and extends to the lower part of the water tank (12); the bottom of the brush rod (14) is driven by a motor (15) fixedly connected with the water tank (12); a group of bristles are uniformly arranged on the upper part of the brush rod (14); a pair of symmetrically arranged supports (16) is fixedly connected in the water tanks (12) at two sides of the disc (13), a sliding chute (17) formed in each support (16) is connected with a sliding rod (18) in a sliding manner, and a spring is arranged between each sliding rod (18) and the bottom of each sliding chute (17); one end of the sliding rod (18) close to the brush rod (14) is fixedly connected with an arc-shaped elastic rod (19), and the elastic rod (19) is used for clamping and fixing the test tube; the brush rod (14) is driven to rotate by the motor (15), so that the cleaning efficiency of the test tube is increased.

2. A chemical laboratory bench according to claim 1, wherein: a hose (2) is arranged in the brush rod (14), and the hose (2) is communicated with the air pump through a distribution valve; a group of spray pipes (21) are uniformly distributed on the periphery of the brush rod (14), and the spray pipes (21) are communicated with the hose (2); the test tube is cooled by the cooling air sprayed out of the spray pipe (21), so that the test tube is prevented from being damaged by quenching.

3. A chemical laboratory bench according to claim 2, wherein: an air bag (22) is arranged at the position, close to the upper part, of the brush rod (14), and the spray pipe (21) is connected with the air bag (22) in a sliding and sealing manner; an electromagnetic valve is arranged in the spray pipe (21), and the spray pipe (21) penetrates through the air bag (22) and extends into the air bag (22); a valve body (23) is fixedly connected to the inner wall of the air bag (22) at a position corresponding to the spray pipe (21), and the spray pipe (21) is connected with a valve hole (24) formed in the valve body (23) in a sliding and sealing manner; a spring is arranged between the spray pipe (21) and the bottom of the valve hole (24), and a first hole (25) is formed in the middle of the spray pipe (21) along the diameter direction of the cross section of the spray pipe (21); an air inlet hole (26) and an air outlet hole (27) are formed in the valve body (23) at a position corresponding to the first hole (25), the air inlet hole (26) is communicated with the hose (2), and the air outlet hole (27) is communicated with the inside of the air bag (22); when the nozzle (21) slides into the air bag (22) after being pressed, the first hole (25) is disconnected and communicated with the air inlet hole (26) and the air outlet hole (27); the expansion size of the air bag (22) is controlled by the nozzle (21) to adapt to the cleaning of test tubes with different inner diameters.

4. A chemical laboratory bench according to claim 3, wherein: the air bags (22) are cylindrical, and a plurality of air bags (22) are arranged side by side along the axial direction of the brush rod (14); the cleaning efficiency is increased by arranging a plurality of air bags (22) and applying the cleaning of the container with gradually changed section shapes.

5. A laboratory bench for chemical experiments according to claim 4, characterized in that: the brush rod (14) is rotatably connected with an upright rod (3), the upper part of the upright rod (3) is fixedly connected with a group of telescopic rods (31) at positions corresponding to the air bag (22), the inner wall of the air bag (22) is provided with wave grooves (32) at positions corresponding to the telescopic rods (31), and one ends, far away from the upright rod (3), of the telescopic rods (31) are embedded into the wave grooves (32) and are in sliding connection with the wave grooves (32); a first magnetic block (33) is fixedly connected to the lower part of the upright rod (3) at a position corresponding to the elastic rod (19), and a second magnetic block (34) is arranged on the elastic rod (19) at a position corresponding to the first magnetic block (33); the first magnetic block (33) is matched with the second magnetic block (34) and the telescopic rod (31), so that the vertical creeping of the air bag (22) is increased, and the cleaning efficiency is further increased.

6. A laboratory bench for chemical experiments according to claim 5, characterized in that: the distribution valve is communicated with the water pump through a pipeline; annular steel wires (35) are inlaid in the inner wall of the air bag (22), the steel wires (35) are in a loose state, the deformation of the air bag (22) is limited through the steel wires (35), and damage to the air bag (22) is reduced.