A gas-liquid path system for cover slip machine sucking and dispensing glue and its control method

Abstract

A gas-liquid circuit system and control method for a coverslipping machine for sucking and dispensing films, belonging to the field of medical device technology, includes a gas circuit system and a liquid circuit system. The gas circuit system is provided with a vacuum pump, a vacuum air tank, a pressure gauge, a solenoid valve, a flow meter, a filter, and a suction cup, etc.; the liquid circuit system is provided with a hydraulic pump, a glue bottle, a return glue bottle, a glue needle, a viscometer, a flow meter, a filter, and a solenoid valve, etc. The system of the present invention uses a vacuum air tank to provide negative pressure, so that the vacuum pump can work intermittently, reducing operating noise and saving energy; the return glue bottle is used to suck back the residual glue in the glue needle, completely eliminating the glue needle from leaking or dripping when it is not dripping; a flow meter is used to monitor the amount of glue dispensed to ensure the accuracy of glue dispensed; a gas flow meter is used to provide information to determine whether the film suction and discharge process is smooth, and timely alarm processing can be provided in the event of a fault, so as to prevent abnormal film suction or discharge from flowing into the next process and prevent the waste of detection resources.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and particularly relates to an air-liquid path system for a coverslipping machine for sucking and dispensing glue, and a control method thereof. Background Art

[0002] As pathology testing technology matures, the number of pathology tests required in medical diagnostics is increasing. Pathology testing typically requires microscopy, which necessitates sample preparation. Sample preparation typically involves three steps: slide preparation, staining, and coverslipping. After sample preparation, the slides are reviewed for diagnosis. However, the increasing number of testing tasks places higher demands on automated and unmanned sample preparation.

[0003] The coverslipping process is performed after slide preparation and staining. After slide preparation and staining, glue is applied to the slide, and then a coverslip is placed on the slide to complete the coverslipping process. However, the increasing number of testing tasks has also put forward higher requirements for automation and unmanned operation in the sample preparation process.

[0004] As can be seen from the coverslipping process, the coverslipping process mainly consists of two steps: dispensing glue and coverslipping. These two steps are highly repetitive and easy to implement, making them easy to automate with machine assistance. This is how coverslippers were born. Coverslippers are widely used in the current pathology industry. However, during their use, it was found that there are still many problems with coverslippers on the market that need to be further solved. The main problems are as follows:

[0005] 1. Most of the current coverslip machines use vacuum pumps to directly adsorb glass slides through pipelines, which causes the vacuum pump to run idle for a lot of time, wastes electricity, increases machine loss, and the continuous operation of the vacuum pump also increases noise pollution.

[0006] 2. When the coverslipping machine's glue needle is not dripping glue, liquid droplets will drip, causing pollution to the inside of the coverslipping machine and the air, and it is difficult to clean. In order to solve the dripping problem, the current coverslipping machine improves the dripping of the colloid by adding a one-way valve and changing the inner diameter of the glue needle to change the surface tension of the liquid. However, the prevention effect is still not ideal and dripping still occurs.

[0007] 3. The coverslipping process has high requirements for the amount of glue used. Too much or too little glue will affect the observation of the sample. The current coverslipping machine cannot accurately control the amount of glue.

[0008] 4. During the suction process of the coverslip machine, the suction cup may fail to suck up the slide (suck up an empty slide) and start the next step. During the placement process, the next step may also begin without the slide being put down. These two situations have a great impact on the accurate work of the coverslip machine, resulting in detection failure, repeated operations, and waste of detection resources. Summary of the Invention

[0009] Aiming at the problems of the vacuum pump idling and consuming power, continuous noise pollution, liquid leakage and dripping from the glue needle when not in operation, inaccurate glue quantity control, detection failure caused by sucking empty films, and repeated operation and waste of detection resources in the above-mentioned existing cover film machines, the present invention provides a gas-liquid circuit system for cover film sucking and glue dripping by a cover film machine and a control method thereof, which uses a vacuum air tank to provide negative pressure to make the vacuum pump work intermittently, reduce operating noise, and save energy; uses a reflux glue bottle to suck back the residual glue in the glue needle under negative pressure, and completely prevents the glue needle from leaking and dripping when not dripping; uses a flow meter to monitor the glue quantity to ensure glue dripping accuracy; uses a gas flow meter to provide information to determine whether the sucking and placing process is smooth, and can promptly alarm and handle in case of faults, so as to avoid abnormal sucking or placing of films into the next process, thereby preventing waste of detection resources. The specific technical solutions are as follows:

[0010] A gas-liquid path system for a coverslipping machine for sucking and dispensing glue, the system comprising an gas path system and a liquid path system; the gas path system comprising a vacuum pump 1, an air outlet of the vacuum pump 1 being connected to a one-way valve Ⅰ2, a gas path behind the one-way valve Ⅰ2 being connected to a vacuum air tank 3, a gas path behind the vacuum air tank 3 being connected to a first tee, dividing the gas path into two branch paths, one of which is connected to an electromagnetic valve Ⅳ6 via a pressure gauge 4, a pipeline behind the electromagnetic valve Ⅳ6 being connected to the liquid path system; the other branch path is connected to an electromagnetic valve Ⅰ5, a gas path behind the electromagnetic valve Ⅰ5 being connected to a second tee, dividing the gas path behind the electromagnetic valve Ⅰ5 into two branches, one of which is connected to an electromagnetic valve Ⅱ7, a gas path behind the electromagnetic valve Ⅱ7 being connected in sequence to a flowmeter Ⅰ9, a filter Ⅰ11 and a suction cup Ⅰ13, and the other branch is connected to an electromagnetic valve Ⅲ8, a gas path behind the electromagnetic valve Ⅲ8 being connected in sequence to a flowmeter Ⅱ10, a filter Ⅱ12 and a suction cup Ⅱ14.

[0011] In the above technical scheme, the liquid circuit system includes a hydraulic pump 21, the outlet pipeline of the hydraulic pump 21 is connected to the one-way valve II20, and the pipeline after the one-way valve II20 is connected to the filter III19, the flowmeter III18 and the solenoid valve VI17 in sequence, and the pipeline after the solenoid valve VI17 is connected to the third tee, dividing the pipeline into two branch liquid circuits, one branch liquid circuit is connected to the glue needle 26, and the other branch liquid circuit is connected to the viscometer 16, the solenoid valve V15 and the return glue bottle 25 in sequence, the liquid outlet pipeline of the return glue bottle 25 is connected to the one-way valve IV24, the liquid outlet pipeline of the one-way valve IV24 is connected to the glue bottle 23, and the liquid outlet pipeline of the glue bottle 23 is connected to the inlet of the hydraulic pump 21 after passing through the one-way valve III22; the air outlet pipeline of the return glue bottle 25 is connected to the air circuit system, that is, the pipeline after the solenoid valve IV6 is connected to the air outlet of the return glue bottle 25.

[0012] In the above technical solution, solenoid valve I5, solenoid valve IV6, solenoid valve II7 and solenoid valve VI17 are provided with 1 station and 2 stations, station 1 is in the pipeline connected state, and station 2 is in the state connected to the stop valve.

[0013] In the above technical solution, solenoid valve II7, solenoid valve III8 and solenoid valve V15 are provided with 1 station and 2 stations, station 1 is in a pipeline connected state, and station 2 is in a state connected to the ambient air.

[0014] In the above technical solution, flowmeter I9 and flowmeter II10 are gas flowmeters; filter I11 and filter II12 are gas filters, and filter III19 is a liquid filter.

[0015] In the above technical solution, the vacuum pump 1, the pressure gauge 4, the solenoid valve I5, the solenoid valve II7, the solenoid valve III8, the solenoid valve IV6, the solenoid valve V15, the solenoid valve VI17, the flowmeter I9, the flowmeter II10, the flowmeter III18, the viscometer 16 and the hydraulic pump 21 are electrically connected to a main controller 30 at the same time and are centrally controlled by the main controller 30. The main controller 30 is used to receive feedback data, make control judgments, issue instructions and alarms.

[0016] In the above technical solution, the suction cup I 13 and the suction cup II 14 are provided with suction cup sensors, which are electrically connected to the main controller 30 ; the glue dropper needle 26 is provided with a glue dropper sensor, which is electrically connected to the main controller 30 .

[0017] The above-mentioned method for controlling the gas-liquid path system of the coverslipping machine for sucking and dispensing glue comprises:

[0018] S1, initial state: solenoid valve I5, solenoid valve IV6 and solenoid valve VI17 are all in position 2, connected to the stop valve, solenoid valve II7, solenoid valve III8 and solenoid valve V15 are all in position 2, connected to the ambient air.

[0019] S2, the process of maintaining the vacuum degree of the vacuum air tank: start the system, and then the vacuum pump 1 starts, and the gas in the vacuum air tank 3 is extracted. When the pressure gauge 4 detects that the vacuum degree reaches the preset value, the pressure gauge 4 data is fed back to the main controller 30, and the main controller 30 issues a command to stop the vacuum pump 1, and the vacuum air tank 3 is in a pressure-maintaining state; the one-way valve I2 is located between the vacuum pump and the vacuum air tank, which plays a better role in maintaining pressure; the solenoid valve I5 and the solenoid valve IV6 are both in position 2, connected to the stop valve, which is conducive to maintaining pressure.

[0020] S3, the process of sucking the cover glass: the suction cup I 13 and the suction cup II 14 move to the top of the cover glass, the suction cup sensor senses that the suction cup has contacted the cover glass, the main controller 30 receives the suction cup sensor sensing data, and issues a command to start the solenoid valve I 5, the solenoid valve II 7 and the solenoid valve III 8 to the 1st position, open the pipeline, and the gas in the pipeline is sucked into the vacuum air tank 3. The pipeline is in a negative pressure state, so that the suction cup I 13 and the suction cup II 14 suck up the cover glass.

[0021] When the film suction situation is normal, the values ​​measured by flowmeter I9 and flowmeter II10 will drop sharply, and the next process will be carried out normally; when the film suction situation is abnormal, that is, the cover glass is not sucked up, the values ​​measured by flowmeter I9 and flowmeter II10 will remain stable, and the abnormal information will be fed back to the main controller for timely alarm, stopping the operation or repeating the film suction operation; among them, filter I11 and filter II12 filter the air to prevent impurities in the gas from entering the vacuum air tank 3 and vacuum pump 1.

[0022] S4, glue dripping process: The glue dripping sensor senses that the glue dripping needle 26 moves to the glue dripping position and transmits the data signal to the main controller 30. The main controller 30 receives the glue dripping sensor signal and issues a command to start the hydraulic pump 21 and start the solenoid valve VI17 in position 1, opening the pipeline. The glue in the glue bottle 23 enters the hydraulic pump 21 through the one-way valve III22 and is then discharged from the outlet of the hydraulic pump 21. It then passes through the one-way valve II20, the filter III19, the flow meter III18 and the solenoid valve VI17 in sequence, and finally enters the glue dripping needle 26 and drips onto the slide. In this process, the flow meter III18 counts the glue. The accumulated glue flow in a time period, when the flow reaches a predetermined value, the flow meter III 18 sends a signal to the main controller 30. After receiving the signal, the main controller 30 issues a command to stop the hydraulic pump 21 from supplying liquid. Each time a glue dripping process ends, that is, after the hydraulic pump stops, the flow meter III 18 reads zero and will be counted again in the next glue dripping process. The setting of the flow meter III 18 ensures the accuracy of the glue dripping amount. The filter III 19 filters out impurities in the glue to ensure that the glue dripping is pure. The one-way valve II 20 and the one-way valve III 22 ensure that the liquid path is unidirectional to avoid glue backflow when the hydraulic pump 21 is started or shut down.

[0023] S5, preventing the glue needle from dripping when it is not working: After the hydraulic pump 21 stops working, the solenoid valve VI17 is started and is in the pipeline closing state. At this time, there is still glue liquid remaining in the glue needle 26. Relying solely on the surface tension of the liquid cannot ensure that the glue liquid does not drip. The glue liquid dripping prevention step is required: the main controller 30 controls the solenoid valve IV6 and the solenoid valve V15 to be started and placed in position 1, opening the pipeline, and connecting the vacuum air tank 3 with the return glue bottle 25, so that the return glue bottle 25 is in a negative pressure state. The glue liquid in the glue needle 26 is sucked back into the return glue bottle 25, so that there is no glue liquid remaining in the glue needle 26, thereby preventing the residual glue liquid from dripping from the glue needle 26;

[0024] When all the glue in the glue drop needle 26 is sucked back into the return glue bottle 25, the medium flowing through the viscometer 16 changes from glue to gas, the value of the viscometer 16 changes, and the value is fed back to the main controller 30. The main controller 30 issues an instruction to start the solenoid valve IV6 in position 2 and connect it to the stop valve, ensuring the pressure maintenance of the vacuum air tank 3, and at the same time start the solenoid valve V15 in position 2 and connect it to the ambient air, ensuring that the glue in the return glue bottle 25 can be sucked into the glue bottle 23 when the hydraulic pump 21 supplies liquid, and participate in recycling; after all the glue in the return glue bottle 25 is sucked into the glue bottle 23, or when there is no glue in the return glue bottle 25, the solenoid valve V15 is still in position 2, so that the glue bottle 23 is connected to the ambient air, which is conducive to the smooth suction of the glue into the hydraulic pump 21; a one-way valve IV24 is set between the return glue bottle 25 and the glue bottle 23 to ensure that the glue can only flow in one direction.

[0025] S6, sheet placement process: After the glue dripping process is completed, the suction cup I 13 and the suction cup II 14 drive the cover glass to move above the slide. The suction cup sensor detects and sends a message that the cover glass has arrived. After receiving the message, the main controller issues a cover and place instruction. Among them, the cover instruction is executed by the downward movement of the suction cup I 13 and the suction cup II 14; the sheet placement instruction is executed by the air circuit system, that is, the solenoid valve I 5 is started and is in position 2, connected to the stop valve to ensure the pressure of the vacuum air tank 3; and the solenoid valve II 7 and the solenoid valve III 8 are simultaneously started and are in position 2, connected to the ambient air, so that the air circuit where the suction cup is located is filled with air and equal to the ambient atmospheric pressure. The cover glass is no longer adsorbed, and the sheet placement is completed;

[0026] When the film is placed normally and the air path where the suction cup is located is connected to the ambient air, flow meter I9 and flow meter II10 measure flow changes; when the film is placed abnormally and the cover glass has not separated from the suction cup, flow meter I9 and flow meter II10 cannot detect flow changes, and feed back the abnormal information to the main controller 30 for timely alarm, stopping the operation or repeating the film placement operation.

[0027] S7, continue to suck the film, drip glue, cover the film, and place the film, then repeat S2-S6 operations; when the work is completed, before shutting down the system, return all valves to the initial state and shut down the power.

[0028] Compared with the prior art, the gas-liquid path system and control method of the coverslipping machine for sucking and dispensing glue of the present invention have the following beneficial effects:

[0029] 1. Save energy and protect the working environment: There is no vacuum air tank to provide negative pressure in the existing technology system, so the vacuum pump needs to work continuously, resulting in energy waste and noise pollution during operation. The present invention designs a combination of a vacuum pump, a vacuum air tank and a barometer to achieve intermittent operation of the vacuum pump, and provides operating negative pressure through the vacuum air tank, thereby avoiding energy waste caused by continuous operation of the vacuum pump, as well as noise and vibration pollution caused by continuous operation. Compared with the continuous work of the prior art, the intermittent operation of the vacuum pump of the present invention saves more than half of the vacuum pump's operating time, saves electric energy, reduces vacuum pump loss, and reduces the noise generated when the vacuum pump is working, which plays a protective role for the staff. When the system is working, the intermittent operation of the vacuum pump reduces the impact of the vibration generated by it on the machine operation process.

[0030] 2. Clean and pollution-free working environment: The present invention designs a return glue bottle and connects it to a vacuum air tank. Through the repositioning of the solenoid valve, the return glue bottle is in a negative pressure state. Combined with components such as a viscometer, after the glue dripping is completed, the residual glue in the glue dripping needle is sucked back and the residual glue in the glue dripping needle is emptied. Therefore, it can completely solve the problem of glue dripping from the glue dripping needle when it is not working, and achieve no glue dripping from the glue dripping needle during the non-glue dripping period, successfully avoiding uncontrolled glue dripping to pollute the coverslip machine workbench and the surrounding environment, and ensuring that the working process of the coverslip machine is clean and pollution-free.

[0031] 3. Gas circuit integration, cost saving: The gas circuits for sucking, releasing and anti-drip liquid of the system of the present invention are all led out from the same vacuum air tank, realizing the streamlined integration of the gas circuit system. Compared with two sets of gas circuits, it greatly saves costs and is easier to control.

[0032] 4. Solenoid valve switching makes suction and release of slides more reliable: The system of the present invention uses a combination of multiple solenoid valves to achieve two suction cups sucking and releasing slides in a timed manner. The two suction cups are safer and more reliable. When releasing the slide, the suction cup air path is connected to the ambient air, so that the slide can be released by gravity, and the reliability of successful release is higher.

[0033] 5. Suction and discharge of tablets to avoid loss of control: The system of the present invention provides information through the gas flow meter to determine whether the suction and discharge processes are smooth, and can promptly alarm and handle any failures; it will not allow abnormal suction or discharge states to flow into the next process; and it will not cause waste of detection resources.

[0034] 6. Quantitative glue drop, precise control: By adding a liquid flow meter to the glue drop pipeline and performing feedback closed-loop control, the accuracy of the glue drop amount is guaranteed, avoiding the impact of excessive or insufficient glue drop on sample observation, and more accurately controlling the glue drop amount to provide a guarantee for the next step of film reading.

[0035] 7. Recycling and closed loop: The colloid anti-drip recovery pipeline of the system of the present invention sucks the colloid back to the return glue bottle, and the return glue bottle is connected to the liquid supply glue bottle, thereby realizing the effective recycling of the glue liquid, participating in the cycle, and not wasting the glue liquid, thus avoiding waste and pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of a gas-liquid system for a coverslipping machine for sucking and dispensing glue according to Example 1 of the present invention;

[0037] Figure 2 This is a schematic diagram of the electrical control connection of the gas and liquid circuit system of a coverslipping machine for sucking and dispensing glue in accordance with Example 1 of the present invention;

[0038] Figure 3 This is a control flow chart of the gas-liquid system for a coverslipping machine for sucking and dispensing glue in accordance with Example 1 of the present invention;

[0039] Figure 1-2 In the figure: 1-vacuum pump, 2-check valve I, 3-vacuum air tank, 4-pressure gauge, 5-solenoid valve I, 6-solenoid valve IV, 7-solenoid valve II, 8-solenoid valve III, 9-flow meter I, 10-flow meter II, 11-filter I, 12-filter II, 13-suction cup I, 14-suction cup II; 15-solenoid valve V, 16-viscometer, 17-solenoid valve VI, 18-flow meter III, 19-filter III, 20-check valve II, 21-hydraulic pump, 22-check valve III, 23-glue bottle, 24-check valve IV, 25-reflux glue bottle, 26-glue needle; 30-main controller. DETAILED DESCRIPTION

[0040] The following is a combination of specific implementation cases and attached Figure 1-3 The present invention is further described below, but the present invention is not limited to these embodiments.

[0041] Example 1

[0042] A gas-liquid system for a coverslipping machine for sucking and dispensing glue, such as Figure 1 As shown, the system includes an air circuit system and a liquid circuit system; the air circuit system includes a vacuum pump 1, the air outlet of the vacuum pump 1 is connected to a one-way valve Ⅰ2, the air circuit after the one-way valve Ⅰ2 is connected to a vacuum air tank 3, the air circuit after the vacuum air tank 3 is connected to a first tee, dividing the air circuit into two branches, one branch is connected to the solenoid valve Ⅳ6 through a pressure gauge 4, and the rear pipeline of the solenoid valve Ⅳ6 is connected to the liquid circuit system; the other branch is connected to the solenoid valve Ⅰ5, and the air circuit after the solenoid valve Ⅰ5 is connected to a second tee, dividing the rear air circuit of the solenoid valve Ⅰ5 into two branches, one branch is connected to the solenoid valve Ⅱ7, and the air circuit after the solenoid valve Ⅱ7 is connected to a flow meter Ⅰ9, a filter Ⅰ11 and a suction cup Ⅰ13 in sequence, and the other branch is connected to the solenoid valve Ⅲ8, and the air circuit after the solenoid valve Ⅲ8 is connected to a flow meter Ⅱ10, a filter Ⅱ12 and a suction cup Ⅱ14 in sequence.

[0043] The liquid circuit system includes a hydraulic pump 21, the outlet pipeline of the hydraulic pump 21 is connected to the one-way valve II20, and the pipeline after the one-way valve II20 is connected to the filter III19, the flowmeter III18 and the solenoid valve VI17 in sequence. The pipeline after the solenoid valve VI17 is connected to the third T-joint, dividing the pipeline into two branch liquid circuits, one branch liquid circuit is connected to the glue needle 26, and the other branch liquid circuit is connected to the viscometer 16, the solenoid valve V15 and the return glue bottle 25 in sequence. The liquid outlet pipeline of the return glue bottle 25 is connected to the one-way valve IV24, and the liquid outlet pipeline of the one-way valve IV24 is connected to the glue bottle 23. The liquid outlet pipeline of the glue bottle 23 is connected to the inlet of the hydraulic pump 21 after passing through the one-way valve III22; the air outlet pipeline of the return glue bottle 25 is connected to the air circuit system, that is, the pipeline after the solenoid valve IV6 is connected to the air outlet of the return glue bottle 25.

[0044] Among them, solenoid valve I5, solenoid valve IV6, solenoid valve II7, and solenoid valve VI17 are set with one position and two positions. Position 1 is connected to the pipeline, and position 2 is connected to the stop valve. Solenoid valve II7, solenoid valve III8, and solenoid valve V15 are set with one position and two positions. Position 1 is connected to the pipeline, and position 2 is connected to the ambient air.

[0045] Among them, the vacuum pump 1, the pressure gauge 4, the solenoid valve I5, the solenoid valve II7, the solenoid valve III8, the solenoid valve IV6, the solenoid valve V15, the solenoid valve VI17, the flow meter I9, the flow meter II10, the flow meter III18, the viscometer 16 and the hydraulic pump 21 are electrically connected to a main controller 30 and are centrally controlled by the main controller 30, as shown in FIG. Figure 2 As shown; the main controller 30 is used to receive feedback data, control judgment, issue instructions and alarms. Suction cup I 13 and suction cup II 14 are equipped with suction cup sensors, which are electrically connected to the main controller 30; the glue needle 26 is equipped with a glue drop sensor, which is electrically connected to the main controller 30.

[0046] The flowmeter I9 and the flowmeter II10 of the system of this embodiment are gas flowmeters; the filters I11 and II12 are gas filters, and the filter III19 is a liquid filter.

[0047] The above-mentioned method for controlling the gas-liquid path system of the coverslipping machine for sucking and dispensing glue comprises:

[0048] S1, initial state: solenoid valve I5, solenoid valve IV6 and solenoid valve VI17 are all in position 2, connected to the stop valve, solenoid valve II7, solenoid valve III8 and solenoid valve V15 are all in position 2, connected to the ambient air.

[0049] S2, the process of maintaining the vacuum degree of the vacuum air tank: start the system, and then the vacuum pump 1 starts, and the gas in the vacuum air tank 3 is extracted. When the pressure gauge 4 detects that the vacuum degree reaches the preset value, the pressure gauge 4 data is fed back to the main controller 30, and the main controller 30 issues a command to stop the vacuum pump 1, and the vacuum air tank 3 is in a pressure-maintaining state; the one-way valve I2 is located between the vacuum pump and the vacuum air tank, which plays a better role in maintaining pressure; the solenoid valve I5 and the solenoid valve IV6 are both in position 2, connected to the stop valve, which is conducive to maintaining pressure.

[0050] S3, the process of sucking the cover glass: the suction cup I 13 and the suction cup II 14 move to the top of the cover glass, the suction cup sensor senses that the suction cup has contacted the cover glass, the main controller 30 receives the suction cup sensor sensing data, and issues a command to start the solenoid valve I 5, the solenoid valve II 7 and the solenoid valve III 8 to the 1st position, open the pipeline, and the gas in the pipeline is sucked into the vacuum air tank 3. The pipeline is in a negative pressure state, so that the suction cup I 13 and the suction cup II 14 suck up the cover glass.

[0051] When the film suction situation is normal, the values ​​measured by flowmeter I9 and flowmeter II10 will drop sharply, and the next process will be carried out normally; when the film suction situation is abnormal, that is, the cover glass is not sucked up, the values ​​measured by flowmeter I9 and flowmeter II10 will remain stable, and the abnormal information will be fed back to the main controller for timely alarm, stopping the operation or repeating the film suction operation; among them, filter I11 and filter II12 filter the air to prevent impurities in the gas from entering the vacuum air tank 3 and vacuum pump 1.

[0052] S4, glue dripping process: The glue dripping sensor senses that the glue dripping needle 26 moves to the glue dripping position and transmits the data signal to the main controller 30. The main controller 30 receives the glue dripping sensor signal and issues a command to start the hydraulic pump 21 and start the solenoid valve VI17 in position 1, opening the pipeline. The glue in the glue bottle 23 enters the hydraulic pump 21 through the one-way valve III22 and is then discharged from the outlet of the hydraulic pump 21. It then passes through the one-way valve II20, the filter III19, the flow meter III18 and the solenoid valve VI17 in sequence, and finally enters the glue dripping needle 26 and drips onto the slide. In this process, the flow meter III18 counts the glue. The accumulated glue flow in a time period, when the flow reaches a predetermined value, the flow meter III 18 sends a signal to the main controller 30. After receiving the signal, the main controller 30 issues a command to stop the hydraulic pump 21 from supplying liquid. Each time a glue dripping process ends, that is, after the hydraulic pump stops, the flow meter III 18 reads zero and will be counted again in the next glue dripping process. The setting of the flow meter III 18 ensures the accuracy of the glue dripping amount. The filter III 19 filters out impurities in the glue to ensure that the glue dripping is pure. The one-way valve II 20 and the one-way valve III 22 ensure that the liquid path is unidirectional to avoid glue backflow when the hydraulic pump 21 is started or shut down.

[0053] S5, preventing the glue needle from dripping when it is not working: After the hydraulic pump 21 stops working, the solenoid valve VI17 is started and is in the pipeline closing state. At this time, there is still glue liquid remaining in the glue needle 26. Relying solely on the surface tension of the liquid cannot ensure that the glue liquid does not drip. The glue liquid dripping prevention step is required: the main controller 30 controls the solenoid valve IV6 and the solenoid valve V15 to be started and placed in position 1, opening the pipeline, and connecting the vacuum air tank 3 with the return glue bottle 25, so that the return glue bottle 25 is in a negative pressure state. The glue liquid in the glue needle 26 is sucked back into the return glue bottle 25, so that there is no glue liquid remaining in the glue needle 26, thereby preventing the residual glue liquid from dripping from the glue needle 26;

[0054] When all the glue in the glue drop needle 26 is sucked back into the return glue bottle 25, the medium flowing through the viscometer 16 changes from glue to gas, the value of the viscometer 16 changes, and the value is fed back to the main controller 30. The main controller 30 issues an instruction to start the solenoid valve IV6 in position 2 and connect it to the stop valve, ensuring the pressure maintenance of the vacuum air tank 3, and at the same time start the solenoid valve V15 in position 2 and connect it to the ambient air, ensuring that the glue in the return glue bottle 25 can be sucked into the glue bottle 23 when the hydraulic pump 21 supplies liquid, and participate in recycling; after all the glue in the return glue bottle 25 is sucked into the glue bottle 23, or when there is no glue in the return glue bottle 25, the solenoid valve V15 is still in position 2, so that the glue bottle 23 is connected to the ambient air, which is conducive to the smooth suction of the glue into the hydraulic pump 21; a one-way valve IV24 is set between the return glue bottle 25 and the glue bottle 23 to ensure that the glue can only flow in one direction.

[0055] S6, sheet placement process: After the glue dripping process is completed, the suction cup I 13 and the suction cup II 14 drive the cover glass to move above the slide. The suction cup sensor detects and sends a message that the cover glass has arrived. After receiving the message, the main controller issues a cover and place instruction. Among them, the cover instruction is executed by the downward movement of the suction cup I 13 and the suction cup II 14; the sheet placement instruction is executed by the air circuit system, that is, the solenoid valve I 5 is started and is in position 2, connected to the stop valve to ensure the pressure of the vacuum air tank 3; and the solenoid valve II 7 and the solenoid valve III 8 are simultaneously started and are in position 2, connected to the ambient air, so that the air circuit where the suction cup is located is filled with air and equal to the ambient atmospheric pressure. The cover glass is no longer adsorbed, and the sheet placement is completed;

[0056] When the film is placed normally and the air path where the suction cup is located is connected to the ambient air, flow meter I9 and flow meter II10 measure flow changes; when the film is placed abnormally and the cover glass has not separated from the suction cup, flow meter I9 and flow meter II10 cannot detect flow changes, and feed back the abnormal information to the main controller 30 for timely alarm, stopping the operation or repeating the film placement operation.

[0057] S7, continue to suck the film, drip glue, cover the film, and place the film, then repeat S2-S6 operations; when the work is completed, before shutting down the system, return all valves to the initial state and shut down the power.

[0058] The control flow of the system in this embodiment is as follows Figure 3 The system of this embodiment has been used effectively. During operation, the vacuum tank provides negative pressure, and the vacuum pump stops intermittently, reducing noise pollution and saving energy. The two suction cups suck and release the cover glass very smoothly, and no abnormalities occurred during continuous use for one month. In particular, the dispensing needle does not leak glue when it is not dispensing glue, which greatly improves the workbench environment and ensures safe and reliable operation.

Claims

1. A method for controlling a gas-liquid system for a coverslipping machine for sucking and dispensing glue, wherein the method comprises: The gas-liquid circuit system of the cover slip machine for sucking and dispensing glue comprises a gas circuit system and a liquid circuit system; the gas circuit system comprises a vacuum pump (1), the air outlet of the vacuum pump (1) is connected to a one-way valve I (2), the gas circuit behind the one-way valve I (2) is connected to a vacuum air tank (3), the gas circuit behind the vacuum air tank (3) is connected to a first tee, and the gas circuit is divided into two branches, one of which is connected to an electromagnetic valve IV (6) through a pressure gauge (4), and the rear pipeline of the electromagnetic valve IV (6) is connected to the liquid circuit system; the other branch The gas circuit is connected to the electromagnetic valve I (5), and the gas circuit after the electromagnetic valve I (5) is connected to a second tee, which divides the gas circuit after the electromagnetic valve I (5) into two branches, one of which is connected to the electromagnetic valve II (7), and the gas circuit after the electromagnetic valve II (7) is connected to the flow meter I (9), the filter I (11) and the suction cup I (13) in sequence, and the other branch is connected to the electromagnetic valve III (8), and the gas circuit after the electromagnetic valve III (8) is connected to the flow meter II (10), the filter II (12) and the suction cup II (14) in sequence; The liquid system includes a hydraulic pump (21), the outlet pipeline of the hydraulic pump (21) is connected to a one-way valve II (20), the pipeline after the one-way valve II (20) is connected in sequence to a filter III (19), a flow meter III (18) and a solenoid valve VI (17), the pipeline after the solenoid valve VI (17) is connected to a third tee, dividing the pipeline into two branch liquid lines, one branch liquid line is connected to the glue needle (26), and the other branch liquid line is connected in sequence to the viscometer (16), The solenoid valve V (15) and the return glue bottle (25) are connected. The liquid outlet pipeline of the return glue bottle (25) is connected to the one-way valve IV (24). The liquid outlet pipeline of the one-way valve IV (24) is connected to the glue bottle (23). The liquid outlet pipeline of the glue bottle (23) is connected to the inlet of the hydraulic pump (21) after passing through the one-way valve III (22); the air outlet pipeline of the return glue bottle (25) is connected to the air circuit system, and the pipeline behind the solenoid valve IV (6) is connected to the air outlet of the return glue bottle (25); The solenoid valve I (5), solenoid valve IV (6) and solenoid valve VI (17) are provided with 1 station and 2 stations, the 1 station is in a pipeline connection state, and the 2 station is in a state connected to the stop valve; The solenoid valve II (7), the solenoid valve III (8) and the solenoid valve V (15) are provided with 1 station and 2 stations, the 1 station is in a pipeline connection state, and the 2 station is in a state of connection with ambient air; The vacuum pump (1), pressure gauge (4), solenoid valve I (5), solenoid valve II (7), solenoid valve III (8), solenoid valve IV (6), solenoid valve V (15), solenoid valve VI (17), flow meter I (9), flow meter II (10), flow meter III (18), viscometer (16) and hydraulic pump (21) are electrically connected to a main controller (30) and are centrally controlled by the main controller (30); The suction cup I (13) and the suction cup II (14) are provided with suction cup sensors, and the suction cup sensors are electrically connected to the main controller (30); the glue dropper needle (26) is provided with a glue dropper sensor, and the glue dropper sensor is electrically connected to the main controller (30); The control method of the gas-liquid path system of the coverslipping machine for sucking and dispensing glue comprises: S1, initial state: solenoid valve I (5), solenoid valve IV (6) and solenoid valve VI (17) are all in position 2, connected to the stop valve, solenoid valve II (7), solenoid valve III (8) and solenoid valve V (15) are all in position 2, connected to the ambient air; S2, the process of maintaining the vacuum degree in the vacuum tank: the gas-liquid system of the coverslipping machine for sucking and dispensing glue is started, and then the vacuum pump (1) is started, and the gas in the vacuum tank (3) is extracted. When the pressure gauge (4) detects that the vacuum degree reaches the preset value, the pressure gauge (4) data is fed back to the main controller (30), and the main controller (30) issues a command to stop the vacuum pump (1), and the vacuum tank (3) is in a pressure-maintaining state; the one-way valve I (2) is located between the vacuum pump and the vacuum tank, playing a role in maintaining pressure; the solenoid valve I (5) and the solenoid valve IV (6) are both in the 2nd position, connected to the stop valve, which is conducive to maintaining pressure; S3, sucking process: the sucker I (13) and the sucker II (14) move to the top of the cover glass, the sucker sensor senses that the sucker has contacted the cover glass, the main controller (30) receives the sensing data of the sucker sensor and issues a command to make the solenoid valve I (5), the solenoid valve II (7) and the solenoid valve III (8) be in position 1, open the air path, and the gas in the air path is sucked into the vacuum air tank (3), and the air path is in a negative pressure state, so that the sucker I (13) and the sucker II (14) suck up the cover glass; S4, glue dripping process: the glue dripping sensor senses that the glue dripping needle (26) moves to the glue dripping position and transmits the data signal to the main controller (30). The main controller (30) receives the glue dripping sensor signal and issues a command to start the hydraulic pump (21), and puts the solenoid valve VI (17) in position 1, opens the pipeline, and the glue in the glue bottle (23) enters the hydraulic pump (21) through the one-way valve III (22), and is then discharged from the outlet of the hydraulic pump (21), and then passes through the one-way valve II (20), filter III (19), flow meter III (18) and solenoid valve VI (17) in sequence, and finally enters the glue dripping needle (26) and drips onto the slide; in this process, the flow meter III (1 8) The accumulated glue flow rate during the statistical period is calculated. When the flow rate reaches a predetermined value, the flow meter III (18) sends a signal to the main controller (30). After receiving the signal, the main controller (30) issues a command to stop the hydraulic pump (21) from supplying liquid. Each time a glue dripping process is completed and the hydraulic pump stops, the flow meter III (18) reads zero and will be counted again in the next glue dripping process. The setting of the flow meter III (18) ensures the accuracy of the glue dripping amount. The filter III (19) filters out impurities in the glue liquid to ensure the purity of the glue dripping. The one-way valve II (20) and the one-way valve III (22) ensure that the liquid path is unidirectional, avoiding the glue liquid from flowing back when the hydraulic pump (21) is started or shut down. S5, preventing the glue needle from dripping in the non-working state: after the hydraulic pump (21) stops working, the solenoid valve VI (17) is in the 2nd position state. At this time, there is still glue liquid remaining in the glue needle (26). Relying only on the surface tension of the liquid cannot ensure that the glue liquid does not drip. It is necessary to perform the glue liquid dripping prevention step: the main controller (30) controls the solenoid valve IV (6) and the solenoid valve V (15) to be in the 1st position, opens the pipeline, and connects the vacuum air tank (3) with the return glue bottle (25), so that the return glue bottle (25) is in a negative pressure state, and the glue liquid in the glue needle (26) is sucked back into the return glue bottle (25), so that there is no glue liquid remaining in the glue needle (26), thereby preventing the residual glue liquid from dripping from the glue needle (26); S6, the process of placing the slide: after the glue dripping process is completed, the suction cup I (13) and the suction cup II (14) drive the cover glass to move above the slide, the suction cup sensor detects and sends the information that it has reached the slide, and after receiving the information, the main controller sends the cover glass instruction and the release glass instruction, wherein the cover glass instruction is executed by the suction cup I (13) and the suction cup II (14) moving down; the release glass instruction is executed by the air circuit system, and the solenoid valve I (5) is controlled to be in the 2nd position, connected to the stop valve, to ensure the pressure of the vacuum air tank (3); and the solenoid valve II (7) and the solenoid valve III (8) are simultaneously in the 2nd position, connected to the ambient air, so that the air circuit where the suction cup is located is filled with air and equal to the ambient atmospheric pressure, the cover glass is no longer adsorbed, and the release glass is completed.

2. The method for controlling the gas-liquid system of a coverslipping machine for sucking and dispensing glue according to claim 1, characterized in that: In S3, when the cover glass is sucked up normally, the values ​​measured by flow meter I (9) and flow meter II (10) will drop sharply, and the next process will be carried out normally; when the cover glass is sucked up abnormally, the values ​​measured by flow meter I (9) and flow meter II (10) will remain stable, and the abnormal information will be fed back to the main controller for timely alarm, stopping the operation or repeating the cover glass sucking operation; wherein, filter I (11) and filter II (12) filter the air to prevent impurities in the gas from entering the vacuum tank (3) and vacuum pump (1).

3. The method for controlling the gas-liquid system of a coverslipping machine for sucking and dispensing glue according to claim 1, characterized in that: In S5, when all the glue in the glue needle (26) is sucked back into the return glue bottle (25), the medium flowing through the viscometer (16) changes from glue to gas, the value of the viscometer (16) changes, and the value is fed back to the main controller (30). The main controller (30) issues a command to put the solenoid valve IV (6) in position 2 and connect it to the stop valve, ensuring the pressure maintenance of the vacuum tank (3). At the same time, the solenoid valve V (15) is in position 2 and connected to the ambient air, ensuring The glue liquid in the return glue bottle (25) can be sucked into the glue bottle (23) when the hydraulic pump (21) supplies the liquid, and participate in the recycling; after all the glue liquid in the return glue bottle (25) is sucked into the glue bottle (23), the solenoid valve V (15) is still in the 2nd position, so that the glue bottle (23) is connected with the ambient air, which is conducive to the smooth suction of the glue liquid into the hydraulic pump (21); a one-way valve IV (24) is set between the return glue bottle (25) and the glue bottle (23) to ensure that the glue liquid can only flow in one direction.

4. The method for controlling the gas-liquid system of a coverslipping machine for sucking and dispensing glue according to claim 1, characterized in that: In S6, when the film is placed normally and the air path where the suction cup is located is connected to the ambient air, flow meter I (9) and flow meter II (10) detect a flow change; when the film is placed abnormally and the cover glass is not separated from the suction cup, flow meter I (9) and flow meter II (10) cannot detect a flow change, and the abnormal information is fed back to the main controller (30) for timely alarm, stopping the operation or repeating the film placement operation.

5. The method for controlling the gas-liquid system of a coverslipping machine for sucking and dispensing glue according to claim 1, characterized in that: The control method further includes: S7, continuously performing the work of sucking the film, dripping glue, covering the film, and placing the film, and then repeating the operations of S2-S6; when the work is completed, before closing the gas and liquid circuit system of the cover film machine for sucking the film and dripping glue, the solenoid valve I (5), the solenoid valve IV (6) and the solenoid valve VI (17) are all in the 2nd position, the solenoid valve II (7), the solenoid valve III (8) and the solenoid valve V (15) are all in the 2nd position, and the power is turned off.

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