A laboratory table capable of automatically recycling chemical residues

Abstract

The present invention discloses a laboratory table capable of automatically recovering chemical residues, comprising a laboratory table body, wherein the laboratory table body is provided with a recovery tank, a waste liquid chamber, a pre-neutralization chamber and a waste liquid tank in order from top to bottom, wherein the recovery tank is connected with the waste liquid chamber through a waste liquid channel, wherein the waste liquid chamber comprises an acid liquid chamber and an alkali liquid chamber, wherein the acid liquid chamber and the alkali liquid chamber are both connected with the pre-neutralization chamber through a liquid guide channel, wherein the pre-neutralization chamber and the waste liquid tank are connected through a liquid discharge channel, wherein the laboratory table body is provided with a control structure for opening and closing the waste liquid channel, wherein a pH sensor and a liquid level sensor are provided in the waste liquid channel, wherein a shunt structure for directing waste liquid to the acid liquid chamber or the alkali liquid chamber is provided in the waste liquid chamber, wherein a flow control structure for controlling liquid flow is provided in the liquid guide channel, wherein the control structure, the pH sensor, the liquid level sensor, the shunt structure and the flow control structure are all electrically connected to a controller. The present invention automatically recovers and processes waste liquid in the experimental process.

Description

Technical Field

[0001] The invention relates to the technical field of laboratory equipment, and in particular to a laboratory table capable of automatically recycling chemical residues. Background Art

[0002] Chemical experiments inevitably produce waste liquids, which usually contain chemicals that are toxic and harmful to the environment or dissolved gases that are more or less unpleasant. Usually, there are waste liquid recovery barrels in the laboratory, and the experimenters can pour the accumulated waste liquid into them after the experiment. Special personnel will handle it centrally. For inorganic chemical experiments with less toxicity, the school will set up special waste liquid recovery pipelines, and the waste liquid will flow into the centralized treatment system. However, in this treatment method, the waste liquid process is longer, which will increase pipeline corrosion and easily cause adverse events such as pipeline leakage. Summary of the invention

[0003] The purpose of the present invention is to address the above-mentioned problems existing in the prior art and to provide a laboratory table which can automatically recycle chemical residues and is convenient for recycling waste liquid generated during the experiment.

[0004] The purpose of the present invention can be achieved through the following technical solutions: a laboratory bench capable of automatically recovering chemical residues, comprising a laboratory bench body, wherein a recovery tank, a waste liquid chamber, a pre-neutralization chamber and a waste liquid tank are arranged on the laboratory bench body from top to bottom in sequence, wherein the recovery tank is connected to the waste liquid chamber through a waste liquid channel, wherein the waste liquid chamber comprises an acid liquid chamber and an alkali liquid chamber, wherein the acid liquid chamber and the alkali liquid chamber are connected to the pre-neutralization chamber through a liquid guide channel, wherein the pre-neutralization chamber and the waste liquid tank are connected through a liquid discharge channel, wherein a control structure for opening and closing the waste liquid channel is arranged on the laboratory bench body, wherein a pH sensor is arranged in the waste liquid channel The waste liquid chamber is provided with a shunt structure for directing the waste liquid to the acid liquid chamber or the alkali liquid chamber, and the liquid guiding channel is provided with a flow control structure for controlling the liquid flow rate. The control structure, pH sensor, liquid level sensor, shunt structure and flow control structure are all electrically connected to the controller; the body of the experimental table is provided with a control chamber connected to the waste liquid channel, and the control structure includes a control part provided in the control chamber and a control driving member for driving the control part to rotate in the control chamber, and a baffle is connected to the outer end of the control part, and the baffle rotates to the waste liquid channel to close the waste liquid channel. The baffle prevents the waste liquid from being discharged directly from the waste liquid channel, so that the waste liquid fills the waste liquid channel, so that the pH value of the waste liquid can be detected by the pH sensor later; the waste liquid channel is provided with a filter screen, and the body of the experimental table is provided with a cleaning structure for cleaning the filter screen, and the cleaning structure is electrically connected to the controller. The filter is used to intercept non-liquid components such as solid particles in the waste liquid to facilitate subsequent safe treatment; the cleaning structure is used to clean the solid particles on the filter to avoid clogging of the filter, and at the same time achieve the purpose of recovering the solid particles; a cleaning chamber connected to the waste liquid channel is provided in the body of the experimental table, and the cleaning chamber is arranged above the filter, and the cleaning structure includes a cleaning ring provided in the cleaning chamber, a connecting part connected to the cleaning ring at one end, and a cleaning driving member connected to the other end of the connecting part and driving the connecting part to rotate in the cleaning chamber, the cleaning ring can be rotated to the top of the filter to fit therewith, a waste outlet is provided on the side of the cleaning chamber away from the filter, a waste bucket is provided below the waste outlet, and a plurality of drainage holes connected to the waste liquid channel are provided on the bottom wall of the cleaning chamber. The movement of the cleaning ring can drive the solid particles filtered on the filter to move together. The cleaning structure is simple, the cleaning is thorough, and the filter is effectively prevented from being blocked. A limiting ring is provided on the outer side of the cleaning ring. The cleaning ring can rotate relative to the limiting ring. The limiting ring is fixedly connected to the end of the connecting part. The cleaning cavity is circular. The cleaning ring is arranged at the edge of the cleaning cavity. The cleaning ring is provided with tooth grooves along its circumferential direction. The inner side wall of the cleaning cavity is provided with teeth matching the tooth grooves in the circumferential direction. When the cleaning ring drives the solid particles on the filter to move, the cleaning ring rotates under the cooperation of the tooth grooves and the teeth, thereby causing the solid particles in the cleaning ring to roll to further remove the waste liquid on the solid particles.

[0005] Optionally, a plurality of partitions are provided in the cleaning ring, and the plurality of partitions divide the interior of the cleaning ring into a plurality of waste chambers. The partitions rotate with the cleaning ring to help intensify the tumbling action of the solid particles in the cleaning ring.

[0006] Optionally, a circular flow control cavity is provided in the liquid guiding channel, and the flow control structure includes a flow control shaft provided at the center of the flow control cavity, a flow control driving member for driving the flow control shaft to rotate in the flow control cavity, and a plurality of flow control sheets evenly provided along the circumferential direction of the flow control shaft, with a flow control gap between two adjacent flow control sheets. The flow control structure controls the flow rate of the liquid flowing through the liquid guiding channel, thereby facilitating the reasonable control of the proportion of the acid and alkali solution in the pre-neutralization cavity.

[0007] Optionally, a splitter plate is provided in the waste liquid chamber, the acid liquid chamber and the alkali liquid chamber are respectively provided on both sides of the splitter plate, and the diversion structure comprises a splitter plate provided above the splitter plate and a diversion driving member for driving the splitter plate to flip left and right in the waste liquid chamber. Under the action of the diversion driving member, the splitter plate rotates toward the acid liquid chamber or the alkali liquid chamber to achieve the purpose of diverting the waste liquid.

[0008] Optionally, the drainage channel is a serpentine structure. When the acid and alkali solutions pass through the drainage channel, neutralization reaction still occurs. The serpentine structure of the drainage channel helps to increase the contact area between the drainage channel and the experimental platform body, thereby improving the heat conduction effect of the heat generated by the neutralization reaction.

[0009] Optionally, the experimental table body is provided with at least one heat dissipation channel near the drainage channel, and a heat dissipation fan is provided in the heat dissipation channel. The heat dissipation fan forces wind to pass through the heat dissipation channel to take away the heat on the inner wall of the heat dissipation channel, thereby achieving a heat dissipation and cooling effect at the drainage channel.

[0010] Compared with the prior art, the present invention has the following advantages:

[0011] After the experiment is over, the experimenter only needs to pour the waste liquid into the recovery tank, which will automatically recycle and preliminarily treat the waste liquid generated during the experiment, thus ensuring the safety of the experimenters and the hygiene of the laboratory environment.

[0012] After the waste liquid is poured into the recovery tank, the liquid level sensor detects the presence of liquid in the waste liquid channel, and the pH sensor starts to detect the pH value of the waste liquid, and controls the diversion structure accordingly to divert the acidic waste liquid into the acid liquid chamber and the alkaline waste liquid into the alkaline liquid chamber. Compared with the traditional method of pouring the acid and alkaline waste liquids into the same waste liquid barrel, it can avoid the neutralization reaction of a large amount of acid and alkali solutions to release a large amount of heat.

[0013] The acid and alkali solutions in the acid chamber and the alkali chamber can enter the pre-neutralization chamber through the liquid guiding channel for neutralization reaction and then enter the waste liquid tank. The flow control structure is used to control the liquid flow rate flowing through the liquid guiding channel, so that the solution in the pre-neutralization chamber undergoes neutralization reaction in small amounts and multiple times. The final waste liquid is in the same waste tank. The acid and alkali value of the waste liquid after neutralization is diluted, which is convenient for subsequent cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Fig. 1 is a schematic diagram of the structure of the present invention;

[0015] Figure 2 The cross-section diagram of the present invention is shown in FIG. Figure 1 ;

[0016] Figure 3 for Figure 2 The local schematic diagram of the A in the middle;

[0017] Figure 4 for Figure 2 The local schematic diagram of point B in the middle;

[0018] Figure 5 for Figure 4 The local schematic diagram of the C in the middle;

[0019] Figure 6 The cross-section diagram of the present invention is shown in FIG. Figure 2 ;

[0020] Figure 7 for Figure 6 The local schematic diagram of point D in the middle;

[0021] In the figure, 1. the main body of the laboratory table; 2. the recovery tank; 31. the acid chamber; 32. the alkali chamber; 4. the pre-neutralization chamber; 5. the waste liquid tank; 6. the waste liquid channel; 7. the liquid guide channel; 8. the liquid discharge channel; 9. the pH sensor; 10. the liquid level sensor; 11. the control chamber; 12. the control part; 13. the control drive; 14. the baffle; 15. the filter screen; 16. the cleaning chamber; 161. the waste outlet; 162. the liquid discharge hole; 17. the cleaning ring; 18. the connecting part; 19. the cleaning drive; 20. the waste barrel; 21. the limit ring; 22. the tooth groove; 23. the tooth; 24. the partition; 25. the waste chamber; 26. the flow control chamber; 27. the flow control axis; 28. the flow control sheet; 29. ​​the flow control gap; 30. the chamber dividing plate; 301. the flow dividing plate; 33. the heat dissipation fan; 34. the LED lamp; 35. the heat dissipation channel. DETAILED DESCRIPTION

[0022] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0023] Combined with Figure 1-7The present embodiment is a laboratory bench capable of automatically recovering chemical residues, comprising a laboratory bench body 1, on which a recovery tank 2, a waste liquid chamber, a pre-neutralization chamber 4 and a waste liquid tank 5 are arranged in order from top to bottom. The recovery tank 2 is an inverted conical tank opened on the top of the laboratory bench body 1, and the lower end of the recovery tank 2 is connected to the waste liquid chamber through a waste liquid channel 6. The waste liquid channel 6 is a vertical channel opened in the laboratory bench body 1, and the waste liquid chamber includes an acid liquid chamber 31 and an alkali liquid chamber 32. A vertical dividing chamber plate 30 is provided in the middle of the waste liquid chamber, and the acid liquid chamber 31 and the alkali liquid chamber 32 are respectively arranged in the dividing chamber On both sides of the plate 30, the acid liquid chamber 31 and the alkali liquid chamber 32 are connected to the pre-neutralization chamber 4 through the liquid guiding channel 7, and the pre-neutralization chamber 4 and the waste liquid tank 5 are connected through the drainage channel 8. The experimental table body 1 is provided with a control structure for opening and closing the waste liquid channel 6, and a pH sensor 9 and a liquid level sensor 10 are provided in the waste liquid channel 6. A shunt structure for directing the waste liquid to the acid liquid chamber 31 or the alkali liquid chamber 32 is provided in the waste liquid chamber, and a flow control structure for controlling the liquid flow is provided in the liquid guiding channel 7. The control structure, the pH sensor 9, the liquid level sensor 10, the shunt structure and the flow control structure are all electrically connected to the controller.

[0024] In this embodiment, an LED lamp 34 electrically connected to the controller is installed on the upper end surface of the experimental bench body 1. When the liquid level sensor 10 detects that there is waste liquid in the waste liquid channel 6, the controller controls the LED lamp 34 to light up to remind the experimenter. When the liquid level sensor 10 detects that there is no waste liquid in the waste liquid channel 6, the LED lamp 34 is powered off and extinguished, and the control structure closes the waste liquid channel 6. At this time, the experimenter is reminded that the next waste liquid can be poured into the recovery tank 2, thereby effectively preventing the mixing of the two waste liquids. The pH sensor 9 and the liquid level sensor 10 are both existing technologies, and both are installed on the inner wall of the waste liquid channel 6 to detect the waste liquid.

[0025] To elaborate further, a control chamber 11 connected to the waste liquid channel 6 is provided in the experimental bench body 1. The control chamber 11 is a horizontally arranged disc-shaped cavity opened in the experimental bench body 1. The control structure includes a control part 12 arranged in the control chamber 11 and a control drive 13 for driving the control part 12 to rotate in the control chamber 11. The control drive 13 is a motor that can be directly purchased on the market and is installed at the center position of the control chamber 11. The control part 12 is a rod with a diameter half the diameter of the control chamber 11. One end of the control part 12 is welded and fixedly connected to the output shaft end of the control drive 13. A baffle 14 is integrally formed at the outer end of the control part 12. The baffle 14 is a circular plate with a diameter not less than the diameter of the waste liquid channel 6. When the baffle 14 rotates to the position where the control chamber 11 is connected to the waste liquid channel 6, the baffle 14 just blocks the opening of the waste liquid channel 6. At this time, the liquid in the waste liquid channel 6 cannot flow downward.

[0026] To further elaborate, in order to filter solid particles in the waste liquid, a filter screen 15 is installed in the waste liquid channel 6, and a cleaning structure for cleaning the filter screen 15 is provided in the laboratory bench body 1, and the cleaning structure is electrically connected to the controller; in this embodiment, the filter screen 15 is installed in the waste liquid channel 6 at a position above the baffle 14, and when the baffle 14 rotates into the waste liquid channel 6, the upper end surface of the baffle 14 fits with the lower end surface of the filter screen 15.

[0027] In this embodiment, a cleaning chamber 16 connected to the waste liquid channel 6 is provided in the laboratory table body 1. The cleaning chamber 16 is a horizontally arranged disc-shaped cavity opened in the laboratory table body 1. The cleaning chamber 16 is offset and opened at the upper right corner of the control chamber 11. The cleaning chamber 16 is arranged above the filter screen 15. The left edge of the cleaning chamber 16 is connected to the waste liquid channel 6. The cleaning structure includes a cleaning ring 17 arranged in the cleaning chamber 16, a connecting portion 18 connected to the cleaning ring 17 at one end, and a cleaning driving member 19 connected to the other end of the connecting portion 18 and driving the connecting portion 18 to rotate in the cleaning chamber 16. The cleaning driving member 19 is a motor that can be directly purchased on the market. Its installation At the center of the cleaning chamber 16, the cleaning ring 17 is a hollow ring structure that can be against the inner wall of the cleaning chamber 16 and can make a circular motion along the edge of the cleaning chamber 16. The height of the cleaning ring 17 is consistent with the cavity height of the cleaning chamber 16. The outer diameter of the cleaning ring 17 is consistent with the diameter of the filter screen 15. The cleaning ring 17 can be rotated to the top of the filter screen 15 to fit it. When the cleaning ring 17 fits with the filter screen 15, the cleaning ring 17 and the filter screen 15 form a container with filter holes at the bottom. The container can effectively collect solid particles in the waste liquid and prevent the solid particles from splashing under the impact of the waste liquid. The cleaning chamber 16 is provided with a waste outlet 16 on the side away from the filter screen 15. 1, the waste outlet 161 is a circular channel opened on the right side of the cleaning chamber 16, and a waste bucket 20 is arranged below the waste outlet 161. The waste bucket 20 is detachably installed in the experimental table body 1, and a plurality of drainage holes 162 connected with the waste liquid channel 6 are arranged on the bottom wall of the cleaning chamber 16. When the cleaning ring 17 rotates from the waste liquid channel 6 to the waste outlet 161, the solid particles filtered on the filter screen 15 can be driven to move together, thereby realizing the cleaning action of the filter screen 15. When the solid particles move to the waste outlet 161, they are convenient to fall downward into the waste bucket 20 below due to their own gravity factors. Therefore, it is only necessary to manually clean the waste bucket 20 regularly. The solid particles can be cleaned. When the solid particles pass through the drainage hole 162 under the action of the cleaning ring 17, the cleaning ring 17 pushes the solid particles forward. The solid particles resist the inner wall of the cleaning ring 17 due to inertia. The solid particles will roll in the process of the cleaning ring 17 pushing the solid particles. The waste liquid adhering to the surface of the solid particles will fall off from the surface of the solid particles as they roll and flow back into the waste liquid channel 6 from the drainage hole 162 below. The above structure can be used to thoroughly screen the waste liquid and the solid particles in the waste liquid, thereby preventing the presence of solid particles in the recovered waste liquid or the presence of waste liquid in the recovered solid particles, which may lead to further reaction between the two and cause danger.

[0028] To elaborate further, a limiting ring 21 is sleeved on the outer side of the cleaning ring 17, and an annular groove matching the limiting ring 21 is opened on the outer arm of the cleaning ring 17. The cleaning ring 17 can rotate relative to the limiting ring 21, and the limiting ring 21 is fixedly connected to the end of the connecting portion 18. The cleaning cavity 16 is circular, and the cleaning ring 17 is arranged at the edge of the cleaning cavity 16. A tooth groove 22 is arranged on the cleaning ring 17 along its circumferential direction, and a tooth 23 matching the tooth groove 22 is arranged on the inner side wall of the cleaning cavity 16 in an extended circumferential direction. With the above structure, when the cleaning ring 17 makes a circular motion along the edge of the cleaning cavity 16 under the driving action of the connecting portion 18, due to the meshing transmission of the teeth 23 and the tooth groove 22, the cleaning ring 17 will rotate at the same time. When the cleaning ring 17 pushes the solid particles forward through the self-rotation of the cleaning ring 17, the solid particles roll more violently in the cleaning ring 17, thereby further improving the efficiency of removing waste liquid on the solid particles, and the self-rotation of the cleaning ring 17 does not require an additional driving member, the structure is simple, and the cost is reduced.

[0029] To further elaborate, a plurality of partitions 24 are provided in the cleaning ring 17, and the plurality of partitions 24 divide the interior of the cleaning ring 17 into a plurality of waste chambers 25; the provision of the partitions 24 enables the cleaning ring 17 to push the solid particles forward, and the partitions 24 can drive the solid particles to perform circular motion around the circumference of the cleaning ring 17 as the cleaning ring 17 rotates, thereby further increasing the rolling frequency of the solid particles.

[0030] To elaborate further, a circular flow control cavity 26 is provided in the liquid guiding channel 7, and the flow control structure includes a flow control shaft 27 provided at the center of the flow control cavity 26, a flow control driving member for driving the flow control shaft 27 to rotate in the flow control cavity 26, and a plurality of flow control plates 28 uniformly arranged along the circumferential direction of the flow control shaft 27. The flow control driving member is a motor that can be directly purchased on the market. The flow control driving member is installed in the experimental table body 1, and its output shaft is fixedly connected to the flow control shaft 27. A flow control gap 29 is provided between two adjacent flow control plates 28. In this embodiment, the outer end of the flow control plate 28 abuts against the inner wall of the flow control cavity 26, thereby preventing waste liquid from leaking from the gap between the outer end of the flow control plate 28 and the inner wall of the flow control cavity 26. When the flow control gap 29 rotates to the upper side, the waste liquid will enter the flow control gap 29 through the liquid guiding channel 7. During the rotation of the flow control plate 28, the flow control gap 29 9 will rotate to the lower position together with the flow control gap 29. At this time, the waste liquid in the flow control gap 29 will fall downward due to gravity, and then flow into the pre-neutralization chamber 4 along the lower end of the liquid guiding channel 7. The above structure is adopted to control the amount of waste liquid entering the pre-neutralization chamber 4. Compared with the traditional control by corrosion-resistant pump, since the amount of waste liquid entering the pre-neutralization chamber 4 each time is small, it is easier to achieve precise control of the amount of waste liquid. The control of the amount of waste liquid only needs to be achieved by controlling the rotation speed of the flow control driving member. In other embodiments, a PH detection sensor can be installed in the acid chamber 31 and the alkali chamber 32 respectively. By real-time detection of the pH value of the waste liquid in the acid chamber 31 and the alkali chamber 32, the corresponding flow control driving member is controlled to work at different rotation speeds, so that the pH value of the acid and alkali waste liquid tends to the intermediate value after the reaction in the pre-neutralization chamber 4.

[0031] In further detail, a splitter plate 30 is provided in the waste liquid chamber, and an acid liquid chamber 31 and an alkali liquid chamber 32 are respectively provided on both sides of the splitter plate 30. The flow dividing structure includes a splitter plate 301 provided above the splitter plate 30 and a splitter driving member for driving the splitter plate 301 to flip left and right in the waste liquid chamber. The splitter driving member is a motor that can be directly purchased on the market. The splitter driving member is installed in the experimental table body 1, and its output shaft is horizontally arranged and fixedly connected to the center of the splitter plate 301. If the pH sensor 9 detects that the waste liquid is acidic, the splitter plate 301 turns toward the acid. One side of the liquid chamber 31 is inclined so that the waste liquid falling on the diverter plate 301 flows into the acid liquid chamber 31 along the inclined surface of the diverter plate 301; if the pH sensor 9 detects that the waste liquid is alkaline, the diverter plate 301 is inclined toward the alkaline liquid chamber 32 so that the waste liquid falling on the diverter plate 301 flows into the alkaline liquid chamber 32 along the inclined surface of the diverter plate 301; the above structure is adopted, so that the acid and alkaline solutions enter two different chambers when being recovered, avoiding a large amount of acid and alkaline solutions from entering the same chamber at the same time, thereby causing the neutralization reaction to be too intense and causing danger.

[0032] To further elaborate, in order to improve the heat dissipation effect during the reaction of acid-base solutions, the drainage channel 8 is a serpentine structure. The serpentine structure increases the structural area of ​​the drainage channel 8 and the experimental table body 1, which helps to improve the heat dissipation effect of the heat in the drainage channel 8; in this embodiment, the experimental table body 1 is provided with two heat dissipation channels 35 near the drainage channel 8, and the two heat dissipation channels 35 are respectively arranged on both sides of the drainage channel 8. The heat dissipation channel 35 runs through the entire experimental table body 1. A heat dissipation fan 33 is provided in the heat dissipation channel 35. The heat dissipation fan 33 is started to allow natural wind to enter from one side of the heat dissipation channel 35 and be discharged from the other side. When the natural wind passes through the heat dissipation channel 35, it can take away part of the heat on the inner wall of the heat dissipation channel 35, thereby achieving a heat dissipation effect.

[0033] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0034] Although more terms are used in this article, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A test bench capable of automatically recovering chemical residues, characterized in that: The laboratory bench body (1) comprises a recovery tank (2), a waste liquid chamber, a pre-neutralization chamber (4) and a waste liquid tank (5) arranged in order from top to bottom, the recovery tank (2) being connected to the waste liquid chamber via a waste liquid channel (6), the waste liquid chamber comprising an acid liquid chamber (31) and an alkali liquid chamber (32), the acid liquid chamber (31) and the alkali liquid chamber (32) being connected to the pre-neutralization chamber (4) via a liquid guide channel (7), and the pre-neutralization chamber (4) being connected to the waste liquid tank (5) via a liquid discharge channel (8). The experimental table body (1) is provided with a control structure for opening and closing the waste liquid channel (6), the waste liquid channel (6) is provided with a pH sensor (9) and a liquid level sensor (10), the waste liquid chamber is provided with a shunt structure for directing the waste liquid to the acid liquid chamber (31) or the alkali liquid chamber (32), the liquid guiding channel (7) is provided with a flow control structure for controlling the liquid flow, and the control structure, the pH sensor (9), the liquid level sensor (10), the shunt structure and the flow control structure are all electrically connected to the controller; The experimental table body (1) is provided with a control chamber (11) in communication with the waste liquid channel (6); the control structure comprises a control unit (12) provided in the control chamber (11) and a control drive member (13) for driving the control unit (12) to rotate in the control chamber (11); a baffle (14) is connected to the outer end of the control unit (12); the baffle (14) rotates to the waste liquid channel (6) to close the waste liquid channel (6); a filter screen (15) is provided in the waste liquid channel (6); a cleaning structure for cleaning the filter screen (15) is provided in the experimental table body (1); the cleaning structure is electrically connected to the controller; The laboratory table body (1) is provided with a cleaning chamber (16) in communication with the waste liquid channel (6), the cleaning chamber (16) being provided above the filter screen (15), the cleaning structure comprising a cleaning ring (17) in the cleaning chamber (16), a connecting portion (18) having one end connected to the cleaning ring (17), and a cleaning driving member (19) connected to the other end of the connecting portion (18) and driving the connecting portion (18) to rotate in the cleaning chamber (16), the cleaning ring (17) being rotatable to the top of the filter screen (15) and being fitted therewith, a waste discharge port (161) being provided on a side of the cleaning chamber (16) away from the filter screen (15), a waste material bucket (20) being provided below the waste discharge port (161), and a plurality of liquid discharge holes (162) in communication with the waste liquid channel (6) being provided on the bottom wall of the cleaning chamber (16); A limiting ring (21) is sleeved on the outside of the cleaning ring (17). The cleaning ring (17) can rotate relative to the limiting ring (21). The limiting ring (21) is fixedly connected to the end of the connecting portion (18). The cleaning cavity (16) is circular. The cleaning ring (17) is arranged at the edge of the cleaning cavity (16). The cleaning ring (17) is provided with tooth grooves (22) along its circumferential direction. The inner wall of the cleaning cavity (16) is provided with teeth (23) matching with the tooth grooves (22) in an extended circumferential direction.

2. The test bench capable of automatically recovering chemical residues according to claim 1, characterized in that: A plurality of partitions (24) are arranged inside the cleaning ring (17), and the plurality of partitions (24) divide the interior of the cleaning ring (17) into a plurality of waste chambers (25).

3. The test bench capable of automatically recovering chemical residues according to claim 1, characterized in that: A circular flow control cavity (26) is provided in the liquid guiding channel (7), and the flow control structure comprises a flow control shaft (27) provided at the center of the flow control cavity (26), a flow control driving member for driving the flow control shaft (27) to rotate in the flow control cavity (26), and a plurality of flow control sheets (28) uniformly arranged along the circumferential direction of the flow control shaft (27), with a flow control gap (29) being provided between two adjacent flow control sheets (28).

4. The test bench capable of automatically recovering chemical residues according to claim 1, characterized in that: A chamber dividing plate (30) is provided in the waste liquid chamber, the acid chamber (31) and the alkali chamber (32) are respectively provided on both sides of the chamber dividing plate (30), and the flow dividing structure comprises a flow dividing plate (301) provided above the chamber dividing plate (30) and a flow dividing driving member used for driving the flow dividing plate (301) to flip left and right in the waste liquid chamber.

5. The test bench capable of automatically recovering chemical residues according to claim 1, characterized in that: The drainage channel (8) is a serpentine structure.

6. The test bench capable of automatically recovering chemical residues according to claim 1, characterized in that: At least one heat dissipation channel (35) is provided on the experimental table body (1) near the drainage channel (8), and a heat dissipation fan (33) is provided in the heat dissipation channel (35).

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