Non-contact liquid taking device and use method thereof

Abstract

The invention discloses a non-contact liquid taking device and a control method thereof. The non-contact liquid taking device comprises a cylindrical box body with openings in the front side and the rear side, a front door body is connected to the opening in the front side of the box body, a rear door body is connected to the opening in the rear side of the box body, a partition plate is arranged in the middle of the box body, an electrical bin is formed between the front door body and the partition plate, and a gas path bin is formed between the rear door body and the partition plate; a PLC automatic control device is installed in the electrical bin, an air supply device and a peristaltic pump are installed in the air path bin, the air supply device and a control panel of the peristaltic pump are both electrically connected with the PLC automatic control device, a pump head of the peristaltic pump is arranged on a box body of the air path bin, and a liquid taking bottle clamping table and a liquid taking pipe support are arranged on the box body on the same side of the pump head. The liquid taking pipe support is located above the liquid taking bottle clamping table. The dismounting process is simple and convenient, and on-site operation is facilitated; non-contact type liquid taking can be achieved in the liquid taking link, and the risks of pipeline cleaning and operation under pressure are effectively avoided; the system is fully automatically controlled, and the field operation process is simplified; and the accurate control resolution ratio of 0.1 milliliter of liquid can be provided.

Description

Technical Field

[0001] The present invention relates to the technical field of automatic liquid collection, and more specifically, to a contactless liquid collection device and a method for using the same. Background Art

[0002] In the current rapidly developing biomedical and chemical pharmaceutical industries, the treatment of hazardous chemical media and toxic wastewater has always been a critical and challenging link. A common situation faced by these industries is that a large amount of liquid sampling and processing relies on pure manual operations, which is not only inefficient, but also fraught with multiple risks and uncertainties.

[0003] In a well-equipped laboratory or a complex field environment, operators wear heavy protective clothing, hold test tubes, liquid guns and other simple tools, and carefully carry out each liquid collection operation. Such scenes seem ordinary, but they are actually hidden dangers. First of all, the sampled liquid often contains volatile components, which are very easy to escape into the air during the operation, forming an imperceptible source of pollution, which not only threatens the health of the operators, but also causes considerable air pollution to the surrounding environment. According to relevant statistics, there are many air pollution incidents caused by the volatilization of chemical liquids every year, and their long-term effects are far-reaching and complex. Furthermore, the accuracy of manual liquid collection is often difficult to guarantee. Even experienced operators can hardly avoid errors under stress or fatigue. This inaccurate amount of liquid collection will not only affect the subsequent experimental results, but may also mislead the entire research or production process, causing immeasurable losses. Therefore, improving the accuracy of liquid collection and realizing automated and intelligent liquid collection operations have become the focus of common concern within and outside the industry. In addition, in scenarios involving pipeline cleaning or pressure operation, manual liquid extraction poses a direct threat to operators. Dangerous factors such as high pressure, high temperature, and corrosive media constantly test the professional skills and psychological quality of operators. Once the operation is improper, the consequences will be disastrous. In recent years, safety accidents caused by human errors have occurred frequently, causing heavy economic losses.

[0004] What is more serious is that when oxygen in the air comes into contact with certain sampled liquids, an oxidation reaction easily occurs, causing the composition of the sampled solution to change, which in turn affects the accuracy of the test results. This error caused by environmental factors is often difficult to detect, but may have a profound impact on the entire research or production process. Therefore, taking effective isolation and protection measures during the liquid sampling process is an important prerequisite for ensuring the accuracy of the test results. Summary of the invention

[0005] In order to solve the technical problem that the existing hazardous solutions are unsafe during the liquid collection process, the present invention innovatively provides a contactless liquid collection device and a control method thereof, which has a simple disassembly and assembly process and is convenient for on-site operation; the liquid collection link can achieve contactless liquid collection, effectively avoiding the risks of pipeline cleaning and pressure operation; the system is fully automatically controlled, simplifying the on-site operation process; and can provide precise control resolution of 0.1 ml of liquid collection.

[0006] To achieve the above-mentioned technical objectives, an embodiment of the present invention discloses a contactless liquid extraction device, comprising a cylindrical box body with front and rear openings, the front opening of the box body being connected to a front door body, the rear opening of the box body being connected to a rear door body, a partition being provided in the middle of the box body, an electrical compartment being formed between the front door body and the partition, an air circuit compartment being formed between the rear door body and the partition, a PLC automatic control device being installed in the electrical compartment, an air supply device and a peristaltic pump being installed in the air circuit compartment, control panels of the air supply device and the peristaltic pump being electrically connected to the PLC automatic control device, a pump head of the peristaltic pump being arranged on the box body of the air circuit compartment, a liquid extraction bottle clamping platform and a liquid extraction tube bracket being provided on the box body on the same side of the pump head, and the liquid extraction tube bracket being located above the liquid extraction bottle clamping platform.

[0007] Furthermore, the present invention provides a contactless liquid extraction device, wherein the gas supply device includes a gas storage tank, a pressure reducing valve, a gas supply solenoid valve, a gas supply stop valve and a gas supply pipe joint, the gas storage tank is filled with pressurized inert gas, the gas supply interface of the gas storage tank is connected to the input end of the pressure reducing valve, the output end of the pressure reducing valve is connected to the input end of the gas supply solenoid valve, the output end of the gas supply solenoid valve is connected to the input end of the gas supply stop valve, the electromagnetic coil of the gas supply solenoid valve is electrically connected to the PLC automatic control device, the output end of the gas supply stop valve is connected to the gas supply pipe joint, and the gas supply pipe joint is fixed on the box body.

[0008] Furthermore, the present invention provides a contactless liquid extraction device, wherein a pressure transmitter is installed between the gas storage tank and the pressure reducing valve, and an output interface of the pressure transmitter is electrically connected to a PLC automatic control device.

[0009] Furthermore, the present invention provides a contactless liquid extraction device, wherein a gas flow meter is installed between the pressure reducing valve and the gas supply solenoid valve, and an output interface of the gas flow meter is electrically connected to a PLC controller.

[0010] Furthermore, the present invention provides a contactless liquid extraction device, wherein the air supply device also includes an air supply stop valve, an air supply solenoid valve and an air supply pipe joint, the air storage tank is vertically arranged, the air supply interface of the air storage tank is arranged at the upper end of the air storage tank, and the lower end of the air storage tank is provided with an air supply interface, the output end of the air supply stop valve is connected to the air supply interface, the input end of the air supply stop valve is connected to the output end of the air supply solenoid valve, the electromagnetic coil of the air supply solenoid valve is electrically connected to the PLC automatic control device, the input end of the air supply solenoid valve is connected to the air supply pipe joint, and the air supply pipe joint is arranged on the box body.

[0011] Furthermore, the present invention provides a contactless liquid taking device, wherein the PLC automatic control device includes a PLC controller, a touch screen, a relay group and a power supply, the PLC controller, the relay group and the power supply are all installed on a mounting plate fixed to the partition, the touch screen is installed on the front door body, the power supply includes a lithium battery and a DC voltage regulator, the output end of the lithium battery is connected to the input end of the DC voltage regulator, the positive output end of the DC voltage regulator serves as the positive pole of the power supply, and the negative output end of the DC voltage regulator serves as the negative pole of the power supply, the PLC controller and the touch screen are connected in parallel between the positive and negative poles of the power supply, the touch screen is signal-connected to the PLC controller, the PLC controller is electrically connected to the drive board of the peristaltic pump, the electromagnetic coil of the air supply solenoid valve and the electromagnetic coil of the air replenishment solenoid valve through the relay group, and is used to control the start and stop of the peristaltic pump and the on and off of the air supply solenoid valve and the air replenishment solenoid valve; the output interfaces of the flow controller and the pressure transmitter are electrically connected to the PLC controller and display the flow and pressure data respectively through the touch screen.

[0012] Furthermore, the present invention provides a contactless liquid taking device, wherein the relay group includes a first relay, a second relay and a third relay, the first end of the coil of the first relay is connected to the negative pole of the power supply, the second end of the coil of the first relay is connected to the first end of the first output terminal 2M-1 of the PLC controller, the second end of the first output terminal 2M-1 of the PLC controller is connected to the positive pole of the power supply, the first end of the electromagnetic coil of the air supply solenoid valve is connected to the negative pole of the power supply, the second end of the electromagnetic coil of the air supply solenoid valve is connected to the first end of the normally open contact of the first relay, and the second end of the normally open contact of the first relay is connected to the positive pole of the power supply; the first end of the coil of the second relay is connected to the negative pole of the power supply, the second end of the coil of the second relay is connected to the second output terminal 2M-1 of the PLC controller -2 first end is connected, the second end of the second output terminal 2M-2 of the PLC controller is connected to the positive pole of the power supply, the first end of the electromagnetic coil of the air supply solenoid valve is connected to the negative pole of the power supply, the second end of the electromagnetic coil of the air supply solenoid valve is connected to the first end of the normally open contact of the second relay, and the second end of the normally open contact of the second relay is connected to the positive pole of the power supply; the first end of the coil of the third relay is connected to the positive pole of the power supply, the second end of the coil of the third relay is connected to the first end of the third output terminal 2M-0 of the PLC controller, the second end of the third output terminal 2M-2 of the PLC controller is connected to the negative pole of the power supply, the first end of the normally open contact of the third relay is connected to the control board enable terminal EN of the peristaltic pump, and the second end of the normally open contact of the third relay is connected to the control board ground terminal COM- of the peristaltic pump.

[0013] Furthermore, the present invention provides a contactless liquid extraction device, wherein the front door body is also provided with a blow pipe button, a lubrication button, a liquid extraction button, an air replenishment button, an emergency stop switch, a power switch and an audible and visual alarm, the first ends of the blow pipe button, the lubrication button, the liquid extraction button and the air replenishment button are all connected to the negative pole of the power supply, the second ends of the blow pipe button, the lubrication button, the liquid extraction button and the air replenishment button are respectively connected one-to-one with the first ends of the input terminals of the PLC controller, the second ends of the input terminals of the PLC controller are all connected to the positive pole of the power supply, the emergency stop switch and the power switch are connected in series between the lithium battery and the DC regulator, the first end of the audible and visual alarm is connected to the negative pole of the power supply, the second end of the audible and visual alarm is connected to the first end of the fourth output terminal of the PLC controller, and the second end of the fourth output terminal of the PLC controller is connected to the positive pole of the power supply.

[0014] The embodiment of the present invention also provides a method for using the contactless liquid collection device, comprising the following steps:

[0015] S1. Press the power switch to turn on the device and wait for the touch screen to fully display.

[0016] S2. Connect one end of the liquid collection tube to the solution storage tank to be collected, and wrap the other end of the liquid collection tube around the pump head of the peristaltic pump;

[0017] S3. The liquid bottle is clamped on the liquid bottle clamping station, and the liquid tube bypassing the pump head of the peristaltic pump and the liquid tube bracket is connected to the liquid bottle;

[0018] S4. Install the gas supply pipe on the gas supply pipe joint;

[0019] S5. Open the air supply stop valve after opening the rear door;

[0020] S6. Press the blowpipe button, and the PLC controller controls the gas supply solenoid valve to open the first countdown time to purge the gas supply pipe;

[0021] S7. After the purging is completed, insert the other end of the air supply pipe into the bottom of the solution storage tank to be taken;

[0022] S8. Press the lubrication button, and the PLC controller controls the air supply solenoid valve and the peristaltic pump to start the second countdown time at the same time, and the solution in the solution storage tank is drawn out of the lubrication tube and delivered to the liquid collection bottle;

[0023] S9. Seal the liquid collection bottle used in the process of lubricating the pipe and replace it with a new one;

[0024] S10. Press the liquid taking button, and the PLC controls the air supply solenoid valve and the peristaltic pump to open the liquid taking bottle at the same time after the third countdown time. If you need to take liquid again, replace the liquid taking bottle and press the liquid taking button again to repeat the liquid taking;

[0025] S11. Pull the liquid pipe in the solution storage tank upward so that the lower end of the liquid pipe is higher than the liquid level of the solution in the solution storage tank;

[0026] S12. Press the drain button, and the PLC controller controls the gas supply solenoid valve and the peristaltic pump to open the fourth countdown time and seal the liquid bottle, and remove the liquid tube and the gas supply tube;

[0027] S13. Close the gas supply stop valve.

[0028] Furthermore, the method for using the contactless liquid extraction device of the present invention further includes the step of replenishing gas in the gas storage tank:

[0029] The gas storage tank gas replenishment step comprises:

[0030] S1.1 When the PLC control detects through the pressure transmitter that the pressure of the gas storage tank is lower than the first pressure value, the gas replenishment step is executed;

[0031] S1.2 Before adding air, connect the air supply pipe to the air supply pipe interface outside the box;

[0032] S1.3 Open the air supply stop valve after opening the rear door;

[0033] S1.4 Press the air supply button, and the PLC controller controls the air supply solenoid valve to remain open to replenish the air tank. The pressure of the air tank can be monitored in real time through the touch screen;

[0034] S1.5 When the PLC controls the pressure transmitter to detect that the pressure of the gas storage tank rises to the second pressure value, the PLC controller closes the gas supply solenoid valve, and controls the sound and light alarm to send out an alarm signal;

[0035] S1.6 Close the air supply stop valve and close the rear door.

[0036] The beneficial effects of the present invention are as follows: the present invention realizes contactless liquid collection, effectively avoiding the risks of pipeline cleaning and pressure operation in the traditional liquid collection method. This feature makes the device have extremely high application value in high-risk fields such as biomedicine and chemical experiments. It can provide an accurate control resolution of 0.1 ml of liquid collection, and this performance index far exceeds the traditional liquid collection method. This enables users to more accurately control the amount of liquid collection when performing micro-liquid collection, thereby improving the accuracy and reliability of the experiment. The contactless liquid collection device adopts a PLC automatic control device for full automatic control, which greatly simplifies the on-site operation process. Users only need to perform simple operations to realize the automatic control of the entire liquid collection process without the need for cumbersome manual operations. This feature not only improves work efficiency, but also reduces the labor intensity of operators. The device has the advantages of compact structure, easy disassembly and assembly, and easy maintenance, so it is suitable for liquid collection needs in various complex environments. Whether it is a laboratory, a factory production line, or a hospital pharmacy, the contactless liquid collection device can give full play to its unique advantages and bring users a more convenient, efficient and safe liquid collection experience. It has demonstrated excellent performance in improving work efficiency and ensuring operational safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the three-dimensional structure of a contactless liquid taking device of the present invention;

[0038] Figure 2 It is a three-dimensional structural schematic diagram of another angle of a contactless liquid taking device of the present invention;

[0039] Figure 3 It is a schematic diagram of the three-dimensional structure of a contactless liquid taking device of the present invention (behind the rear door and the box body);

[0040] Figure 4 This is a schematic diagram of the three-dimensional structure of a contactless liquid collection device of the present invention (behind the front door and the box body);

[0041] Figure 5 It is a schematic diagram of the three-dimensional structure of a gas supply device in a contactless liquid taking device of the present invention;

[0042] Figure 6 This is a working principle diagram of a gas supply device in a contactless liquid taking device of the present invention;

[0043] Figure 7 A wiring schematic diagram of a power supply circuit in a contactless liquid taking device of the present invention;

[0044] Figure 8 It is a wiring schematic diagram of a peristaltic pump control board and a third relay in a contactless liquid extraction device of the present invention;

[0045] Fig. 9 It is a wiring schematic diagram of a gas flow meter and a transmitter in a contactless liquid extraction device of the present invention;

[0046] Fig.10 It is a wiring schematic diagram of a blow pipe button, a pipe lubrication button, a liquid taking button, and an air replenishing button in a contactless liquid taking device of the present invention;

[0047] Fig.11 It is a wiring schematic diagram of the air supply solenoid valve and the first relay in a contactless liquid extraction device of the present invention;

[0048] Fig.12 A wiring schematic diagram of an air replenishment solenoid valve and a second relay in a contactless liquid extraction device of the present invention;

[0049] Fig.13 The present invention is a wiring schematic diagram of an audible and visual alarm in a contactless liquid extraction device. DETAILED DESCRIPTION

[0050] A contactless liquid taking device of the present invention is explained and illustrated in detail below in conjunction with the accompanying drawings of the specification.

[0051] like Figure 1-4As shown, the embodiment of the present invention discloses a contactless liquid taking device, comprising a cylindrical box body 1 with front and rear openings, a front door body 11 connected to the front opening of the box body 1, a rear door body 12 connected to the rear opening of the box body 1, a partition 13 is provided in the middle of the box body 1, an electrical compartment is formed between the front door body 11 and the partition 13, and an air circuit compartment is formed between the rear door body 12 and the partition 13, a PLC automatic control device is installed in the electrical compartment, an air supply device 3 and a peristaltic pump 7 are installed in the air circuit compartment, and the control board 701 of the air supply device 3 and the peristaltic pump 7 are both electrically connected to the PLC automatic control device, and the pump head of the peristaltic pump 7 is arranged on the box body 1 of the air circuit compartment, and a liquid taking bottle clamping platform 6 and a liquid taking tube bracket 5 are arranged on the box body 1 on the same side of the pump head, and the liquid taking tube bracket 5 is located above the liquid taking bottle clamping platform 6. The liquid taking bottle clamping platform 6 can firmly fix the liquid taking bottle 200 to prevent it from shaking or tipping over during the liquid taking process. The liquid collection tube support 5 is located above the liquid collection bottle clamping platform 6, which is responsible for supporting and guiding the liquid collection tube to be accurately inserted into the liquid collection bottle 200. This design not only improves the accuracy and stability of liquid collection, but also greatly simplifies the user's operation process. The PLC automatic control device accurately controls the air supply device 3 and the peristaltic pump 7. When the PLC automatic control device receives the liquid collection instruction, the PLC automatic control device will immediately start the air supply device 3 to provide a stable air source for the peristaltic pump 7; then, the peristaltic pump 7 starts working under the drive of the PLC automatic control device, and its pump head accurately absorbs the liquid in the solution storage tank to be collected, and transports the liquid to the liquid collection bottle 200 through the liquid collection tube. Contactless liquid collection is achieved, effectively avoiding the risks of pipeline cleaning and pressure operation in traditional liquid collection methods. The peristaltic pump 7 can provide a precise control resolution of 0.1 ml for liquid collection, so that the user can more accurately control the amount of liquid collection when performing micro-liquid collection, thereby improving the accuracy and reliability of the experiment. The contactless liquid collection device uses a PLC automatic control device for full automatic control, which greatly simplifies the on-site operation process. Users can achieve automatic control of the entire liquid collection process through simple operations, without the need for tedious manual operations. This feature not only improves work efficiency, but also reduces the labor intensity of operators. The device has the advantages of compact structure, easy disassembly and assembly, and easy maintenance, so it is suitable for liquid collection needs in various complex environments. Whether it is a laboratory, a factory production line, or a hospital pharmacy, the contactless liquid collection device can give full play to its unique advantages and bring users a more convenient, efficient, and safe liquid collection experience. It has demonstrated excellent performance in improving work efficiency and ensuring operational safety.

[0052] like Figure 3 Combined with Figure 5As shown, in one embodiment of the present invention, the gas supply device 3 includes a gas tank 301, a pressure reducing valve 302, a gas supply solenoid valve 303, a gas supply stop valve 304 and a gas supply pipe joint 305. The gas tank 301 is filled with high-pressure inert gas (such as nitrogen, argon, etc.), which is not easy to react with other substances due to its stable chemical properties. The gas tank 301 ensures that the gas can be released quickly and stably when needed. The pressure reducing valve 302 is located between the gas tank 301 and the gas supply solenoid valve 303, and its main function is to adjust the high-pressure gas in the gas tank 301 to the low-pressure range required by the equipment. The electromagnetic coil of the gas supply solenoid valve 303 is electrically connected to the PLC automatic control device, and the opening and closing state of the electromagnetic valve is controlled by receiving the control signal sent by the PLC. When the PLC detects a signal that gas supply is required, it will send an opening instruction to the gas supply solenoid valve 303, and the electromagnetic coil will be energized to drive the valve core to move, so that the solenoid valve opens. On the contrary, when the gas supply task is completed, the PLC will send a closing command, the solenoid valve will close, and the gas source will be cut off. The rapid response and precise control of the gas supply solenoid valve 303 provide strong support for the automation and intelligence of the gas supply system. The gas supply stop valve 304 is connected to the gas supply solenoid valve 303 and is used to manually control the on and off of the gas supply. The gas supply pipe joint 305 is connected to the gas supply stop valve 304 and can be quickly connected to the gas supply pipe. When gas supply is required, first, open the gas supply stop valve 304 to provide a passage for the gas supply system; then, the PLC automatic control device issues a command to energize the electromagnetic coil of the gas supply solenoid valve 303 and open the solenoid valve; at this time, the pressurized inert gas in the gas storage tank 301 is regulated by the pressure reducing valve 302, flows through the gas supply solenoid valve 303 and the gas supply stop valve 304, and finally passes through the gas supply pipe joint 305. In this process, the PLC automatic control device accurately controls the opening time of the gas supply solenoid valve 303 to ensure accurate control of the gas supply amount. The air supply device 3 cooperates with the peristaltic pump 7 to provide a continuous and stable air source, so that the peristaltic pump 7 can perform the liquid extraction operation according to the preset rate and rhythm. This not only improves the accuracy and efficiency of liquid extraction, but also greatly reduces the labor intensity of the operator.

[0053] like Figure 5 Combined with Fig. 9As shown, in one embodiment of the present invention, a pressure transmitter 306 is installed between the gas tank 301 and the pressure reducing valve 302, and the output interface of the pressure transmitter 306 is electrically connected to the PLC automatic control device. When the pressure in the gas tank 301 gradually decreases to a preset threshold due to consumption, the pressure transmitter 306 will quickly capture this change and transmit the signal to the PLC, which will be displayed on the touch screen 402. Remind to add compressed air to the gas tank 301 to ensure that the pressure in the gas tank 301 is always maintained within a safe and efficient range. A gas flow meter 307 is installed between the pressure reducing valve 302 and the gas supply solenoid valve 303, and the output interface of the gas flow meter 307 is electrically connected to the PLC controller 401. Through the gas flow meter 307, the gas supply flow rate at each moment can be clearly understood, and then a close connection is established with the liquid extraction amount. In scenarios such as liquid distribution and chemical reactions where precise control of the amount of liquid taken is required, the gas flow meter 307 can dynamically adjust the liquid taking speed according to changes in the gas supply flow rate to ensure the stability and reliability of the liquid taking accuracy.

[0054] like Figure 5 As shown, in one embodiment of the present invention, the gas supply device 3 further includes a gas supply stop valve 308, a gas supply solenoid valve 309 and a gas supply pipe joint 310, the gas storage tank 301 is vertically arranged, the gas supply interface of the gas storage tank 301 is arranged at the upper end of the gas storage tank 301, and the lower end of the gas storage tank 301 is provided with a gas supply interface, the output end of the gas supply stop valve 308 is connected to the gas supply interface, the input end of the gas supply stop valve 308 is connected to the output end of the gas supply solenoid valve 309, the electromagnetic coil of the gas supply solenoid valve 309 is electrically connected to the PLC automatic control device, the input end of the gas supply solenoid valve 309 is connected to the gas supply pipe joint 310, and the gas supply pipe joint 310 is arranged on the box 1. When gas supply is needed, the gas supply stop valve 308 is first opened, and then the electromagnetic coil of the gas supply solenoid valve 309 is controlled by the PLC automatic control device to be energized, so that the gas supply solenoid valve 309 is opened, and gas can be supplied to the gas storage tank 301. When the pressure in the gas storage tank 301 reaches a preset value, the PLC automatic control device controls the electromagnetic coil of the gas replenishment solenoid valve 309 to lose power, so that the gas replenishment solenoid valve 309 is closed, and finally the gas replenishment stop valve 308 is manually closed to complete the gas replenishment operation.

[0055] like Figure 4 , Figure 7 , Figure 8 , Fig.11 and Fig.12As shown, in one embodiment of the present invention, the PLC automatic control device includes a PLC controller 401, a touch screen 402, a relay group 8 and a power supply. The PLC controller 401, the relay group 8 and the power supply are all installed on a mounting plate fixed to the partition 13, the touch screen 402 is installed on the front door body 11, and the power supply includes a lithium battery 404 and a DC regulator 405. The output end of the lithium battery 404 is connected to the input end of the DC regulator 405, the positive output end of the DC regulator 405 is used as the positive electrode of the power supply, and the negative output end of the DC regulator 405 is used as the negative electrode of the power supply. The C controller 401 and the touch screen 402 are connected in parallel between the positive and negative poles of the power supply, the touch screen 402 is signal-connected to the PLC controller 401, and the PLC controller 401 is electrically connected to the drive board of the peristaltic pump 7, the electromagnetic coil of the air supply solenoid valve 303 and the electromagnetic coil of the air replenishment solenoid valve 309 through the relay group 8, so as to control the start and stop of the peristaltic pump 7, and the on and off of the air supply solenoid valve 303 and the air replenishment solenoid valve 309; the output interfaces of the flow controller and the pressure transmitter 306 are both electrically connected to the PLC controller 401 and display the flow and pressure data respectively through the touch screen 402.

[0056] Specifically, the relay group 8 includes a first relay, a second relay, and a third relay. The first end of the coil 801-1 of the first relay is connected to the negative pole of the power supply, the second end of the coil 801-1 of the first relay is connected to the first end of the first output terminal 2M-1 of the PLC controller 401, the second end of the first output terminal 2M-1 of the PLC controller 401 is connected to the positive pole of the power supply, the first end of the electromagnetic coil of the gas supply solenoid valve 303 is connected to the negative pole of the power supply, the second end of the electromagnetic coil of the gas supply solenoid valve 303 is connected to the first end of the normally open contact 801-2 of the first relay, and the second end of the normally open contact 801-2 of the first relay is connected to the positive pole of the power supply. The PLC controller 401 controls the opening and closing of the gas supply solenoid valve 303 by controlling the power on and off of the coil 801-1 of the first relay. The first end of the coil 802-1 of the second relay is connected to the negative pole of the power supply, the second end of the coil 802-1 of the second relay is connected to the first end of the second output terminal 2M-2 of the PLC controller 401, the second end of the second output terminal 2M-2 of the PLC controller 401 is connected to the positive pole of the power supply, the first end of the electromagnetic coil of the gas replenishment solenoid valve 309 is connected to the negative pole of the power supply, the second end of the electromagnetic coil of the gas replenishment solenoid valve 309 is connected to the first end of the normally open contact 802-2 of the second relay, and the second end of the normally open contact 802-2 of the second relay is connected to the positive pole of the power supply. The PLC controller 401 controls the power on and off of the second relay coil 802-1 to control the opening and closing of the gas replenishment solenoid valve 309. The first end of the coil 803-1 of the third relay is connected to the positive electrode of the power supply, the second end of the coil 803-2 of the third relay is connected to the first end of the third output terminal 2M-0 of the PLC controller 401, the second end of the third output terminal 2M-2 of the PLC controller 401 is connected to the negative electrode of the power supply, the first end of the normally open contact 803-2 of the third relay is connected to the enable terminal EN of the control board 701 of the peristaltic pump 7, and the second end of the normally open contact 803-2 of the third relay is connected to the ground terminal COM- of the control board 701 of the peristaltic pump 7. The PLC controller 401 controls whether the control board 701 of the peristaltic pump 7 is enabled or not by controlling the power on and off of the coil 803-1 of the third relay, thereby controlling the start and stop of the peristaltic pump 7.

[0057] It can be understood by those skilled in the art that a control board 701 for controlling the start and stop of the peristaltic pump 7 is provided inside the peristaltic pump 7. The PLC controller 401 has a plurality of input terminals and a plurality of output terminals, such as a PLC model S7-200SMART produced by Siemens. When the terminals of the PLC controller 401 are insufficient, a PLC expansion module such as EMAQ04 can be used. The relay includes a coil and one or more normally open contacts and normally closed contacts.

[0058] like Figure 1 , Figure 7 Combined with Fig.10 and Fig.13 As shown, in one embodiment of the present invention, the front door body 11 is also provided with a blowpipe button 406, a lubrication button 407, a liquid collection button 408, an air supply button 109, an emergency stop switch 410, a power switch 411 and an audible and visual alarm 412. Among them, the first ends of the blowpipe button 406, the lubrication button 407, the liquid collection button 408 and the air supply button 109 are all connected to the negative electrode of the power supply, and the second ends of the blowpipe button 406, the lubrication button 407, the liquid collection button 408 and the air supply button 109 are respectively connected to the first ends of the input terminals of the PLC controller 401 in a one-to-one correspondence, and the second ends of the input terminals of the PLC controller 401 are all connected to the positive electrode of the power supply. The purpose of the blowpipe button 406, the lubrication button 407, the liquid extraction button 408 and the air replenishment button 109 is to input a corresponding trigger signal to the PLC controller 401. When the blowpipe button 406 is pressed, the blowpipe operation is performed; when the lubrication button 407 is pressed, the lubrication operation is performed; when the liquid extraction button 408 is pressed, the liquid extraction operation is performed; and when the air replenishment button 109 is pressed, the air replenishment operation is performed. The emergency stop switch 410 and the power switch 411 are connected in series between the lithium battery 404 and the DC voltage regulator 405, and the first end of the sound and light alarm 412 is connected to the negative pole of the power supply. When the power switch 411 is pressed, the power supply starts to supply power and each component starts to work; when an emergency occurs, the emergency stop button can be pressed to disconnect the power supply to prevent the situation from further escalating. The second end of the sound and light alarm 412 is connected to the first end of the fourth output terminal of the PLC controller 401, and the second end of the fourth output terminal of the PLC controller 401 is connected to the positive pole of the power supply. The sound and light alarm 412 can alarm when the pressure in the gas storage tank 301 is too low or too high, and can also be used to alarm after the liquid extraction step is completed.

[0059] like Figure 6 As shown, the embodiment of the present invention also provides a method for using a contactless liquid collection device, comprising the following steps:

[0060] S1. Press the power switch 411 to turn on the device and wait for the touch screen 402 to be fully displayed;

[0061] S2. Connect one end of the liquid collection tube to the solution storage tank to be collected, and wrap the other end of the liquid collection tube around the pump head of the peristaltic pump 7;

[0062] S3. The liquid bottle 200 is clamped on the liquid bottle clamping station 6, and the liquid tube bypassing the pump head of the peristaltic pump 7 and the liquid tube holder 5 is connected to the liquid bottle 200;

[0063] S4. Install the gas supply pipe on the gas supply pipe joint 305;

[0064] S5. After opening the rear door 12, open the gas supply stop valve 304;

[0065] S6. Press the blowpipe button 406, and the PLC controller 401 controls the gas supply solenoid valve 303 to open the first countdown time to purge the gas supply pipe;

[0066] S7. After the purging is completed, insert the other end of the air supply pipe into the bottom of the solution storage tank to be taken;

[0067] S8. Press the lubrication button 407, the PLC controller 401 controls the air supply solenoid valve 303 and the peristaltic pump 7 to simultaneously start the second countdown time, the solution in the solution tank is drawn out of the lubrication tube and delivered to the liquid collection bottle 200;

[0068] S9. The liquid bottle 200 used in the process of plugging the lubricating tube is replaced with a new liquid bottle 200;

[0069] S10. Press the liquid button 408, the PLC controls the air supply solenoid valve 303 and the peristaltic pump 7 to open the third countdown time and then seal the liquid bottle 200. If you need to take liquid again, replace the liquid bottle 200 and press the liquid button 408 again to repeat the liquid taking;

[0070] S11. Pull the liquid pipe in the solution storage tank upward so that the lower end of the liquid pipe is higher than the liquid level of the solution in the solution storage tank;

[0071] S12. Press the drain button, the PLC controller 401 controls the gas supply solenoid valve 303 and the peristaltic pump 7 to simultaneously start the fourth countdown time after blocking the liquid bottle 200, and remove the liquid tube and the gas supply tube;

[0072] S13. Close the gas supply stop valve 304.

[0073] The first countdown time, the second countdown time, the third countdown time and the fourth countdown time can be adjusted according to actual conditions. In the present embodiment, the first countdown time is selected to be 30 seconds; the second countdown time, the third countdown time and the fourth countdown time are related to the capacity of the liquid collection bottle 200. In the present embodiment, the second countdown time, the third countdown time and the fourth countdown time are selected to be 17 seconds.

[0074] This method can standardize the liquid collection steps and realize contactless liquid collection, effectively avoiding the risks of pipeline cleaning and pressure operation in traditional liquid collection methods. This feature makes the device have extremely high application value in high-risk fields such as biomedicine and chemical experiments. It can provide precise control resolution of 0.1 ml of liquid collection, and this performance index far exceeds the traditional liquid collection method. This enables users to more accurately control the amount of liquid collected when performing micro-liquid collection, thereby improving the accuracy and reliability of the experiment. The contactless liquid collection device uses a PLC automatic control device for full automatic control, which greatly simplifies the on-site operation process. Users can achieve automatic control of the entire liquid collection process through simple operations, without the need for cumbersome manual operations.

[0075] In one embodiment of the present invention, the gas storage tank 301 is further provided with a gas replenishment step:

[0076] The steps of replenishing gas in the gas storage tank 301 include:

[0077] S1.1 When the PLC control detects through the pressure transmitter 306 that the pressure of the gas storage tank 301 is lower than the first pressure value, the gas replenishment step is executed;

[0078] S1.2 Before replenishing air, first connect the air replenishing pipe to the air replenishing pipe interface outside the box 1;

[0079] S1.3 Open the rear door 12 and then open the air supply stop valve 308;

[0080] S1.4 Press the air supply button 109, and the PLC controller 401 controls the air supply solenoid valve 303 to remain in an open state, so as to supply air to the air storage tank 301. The pressure of the air storage tank 301 can be monitored in real time through the touch screen 402;

[0081] S1.5 When the PLC control detects through the pressure transmitter 306 that the pressure of the gas storage tank 301 rises to the second pressure value, the PLC controller 401 closes the gas supply solenoid valve 303, and the PLC controller 401 controls the sound and light alarm 412 to send out an alarm signal;

[0082] S1.6 Close the air supply stop valve 308 and close the rear door body 12.

[0083] The first pressure value and the second pressure value can be adjusted according to actual conditions. In this embodiment, the first pressure value is preferably 0.15 MPa, and the second pressure value is preferably 1.9 MPa.

[0084] In this embodiment, the automatic gas replenishment of the gas tank 301 is realized. Through the automatic detection and response mechanism, not only the gas replenishment efficiency is improved, but also the stability and safety of the pressure in the gas tank 301 are ensured. The pressure change inside the gas tank 301 can be clearly seen by touching the display screen. Through this real-time detection and precise control method, the stability and accuracy of the gas replenishment process are ensured.

[0085] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0086] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0087] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0088] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and simple improvements made to the essential contents of the present invention shall be included in the protection scope of the present invention.

Claims

1. A contactless liquid collection device, Features: It comprises a cylindrical box body with front and rear openings, wherein the front opening of the box body is connected to a front door body, the rear opening of the box body is connected to a rear door body, a partition is provided in the middle of the box body, an electrical compartment is formed between the front door body and the partition, an air circuit compartment is formed between the rear door body and the partition, a PLC automatic control device is installed in the electrical compartment, an air supply device and a peristaltic pump are installed in the air circuit compartment, control panels of the air supply device and the peristaltic pump are electrically connected to the PLC automatic control device, a pump head of the peristaltic pump is arranged on the box body of the air circuit compartment, a liquid collection bottle clamping platform and a liquid collection tube bracket are provided on the box body on the same side of the pump head, and the liquid collection tube bracket is located above the liquid collection bottle clamping platform.

2. A contactless liquid extraction device according to claim 1, Features: The gas supply device includes a gas storage tank, a pressure reducing valve, a gas supply solenoid valve, a gas supply stop valve and a gas supply pipe joint. The gas storage tank is filled with pressurized inert gas, the gas supply interface of the gas storage tank is connected to the input end of the pressure reducing valve, the output end of the pressure reducing valve is connected to the input end of the gas supply solenoid valve, the output end of the gas supply solenoid valve is connected to the input end of the gas supply stop valve, the electromagnetic coil of the gas supply solenoid valve is electrically connected to the PLC automatic control device, the output end of the gas supply stop valve is connected to the gas supply pipe joint, and the gas supply pipe joint is fixed on the box body.

3. A contactless liquid extraction device according to claim 2, Features: A pressure transmitter is installed between the gas storage tank and the pressure reducing valve, and the output interface of the pressure transmitter is electrically connected to the PLC automatic control device.

4. A contactless liquid extraction device according to claim 3, Features: A gas flow meter is installed between the pressure reducing valve and the gas supply solenoid valve, and an output interface of the gas flow meter is electrically connected to the PLC controller.

5. A contactless liquid taking device according to claim 3, Features: The air supply device also includes an air supply stop valve, an air supply solenoid valve and an air supply pipe joint. The air storage tank is vertically arranged, and the air supply interface of the air storage tank is arranged at the upper end of the air storage tank. The lower end of the air storage tank is provided with an air supply interface. The output end of the air supply stop valve is connected to the air supply interface, and the input end of the air supply stop valve is connected to the output end of the air supply solenoid valve. The electromagnetic coil of the air supply solenoid valve is electrically connected to the PLC automatic control device, and the input end of the air supply solenoid valve is connected to the air supply pipe joint, and the air supply pipe joint is arranged on the box body.

6. A contactless liquid extraction device according to claim 5, Features: The PLC automatic control device includes a PLC controller, a touch screen, a relay group and a power supply. The PLC controller, the relay group and the power supply are all installed on a mounting plate fixed to the partition. The touch screen is installed on the front door body. The power supply includes a lithium battery and a DC voltage regulator. The output end of the lithium battery is connected to the input end of the DC voltage regulator. The positive output end of the DC voltage regulator serves as the positive pole of the power supply, and the negative output end of the DC voltage regulator serves as the negative pole of the power supply. The PLC controller and the touch screen are connected in parallel between the positive and negative poles of the power supply. The touch screen is signal-connected to the PLC controller. The PLC controller is electrically connected to the drive board of the peristaltic pump, the electromagnetic coil of the air supply solenoid valve and the electromagnetic coil of the air replenishment solenoid valve through the relay group, so as to control the start and stop of the peristaltic pump and the on and off of the air supply solenoid valve and the air replenishment solenoid valve; the output interfaces of the flow controller and the pressure transmitter are electrically connected to the PLC controller and display the flow and pressure data respectively through the touch screen.

7. A contactless liquid collection device according to claim 6, Features: The relay group includes a first relay, a second relay and a third relay. The first end of the coil of the first relay is connected to the negative pole of the power supply, the second end of the coil of the first relay is connected to the first end of the first output terminal 2M-1 of the PLC controller, and the second end of the first output terminal 2M-1 of the PLC controller is connected to the positive pole of the power supply. The first end of the electromagnetic coil of the air supply solenoid valve is connected to the negative pole of the power supply, the second end of the electromagnetic coil of the air supply solenoid valve is connected to the first end of the normally open contact of the first relay, and the second end of the normally open contact of the first relay is connected to the positive pole of the power supply; the first end of the coil of the second relay is connected to the negative pole of the power supply, the second end of the coil of the second relay is connected to the first end of the second output terminal 2M-2 of the PLC controller, and the PLC The second end of the second output terminal 2M-2 of the controller is connected to the positive pole of the power supply, the first end of the electromagnetic coil of the air supply solenoid valve is connected to the negative pole of the power supply, the second end of the electromagnetic coil of the air supply solenoid valve is connected to the first end of the normally open contact of the second relay, and the second end of the normally open contact of the second relay is connected to the positive pole of the power supply; the first end of the coil of the third relay is connected to the positive pole of the power supply, the second end of the coil of the third relay is connected to the first end of the third output terminal 2M-0 of the PLC controller, the second end of the third output terminal 2M-2 of the PLC controller is connected to the negative pole of the power supply, the first end of the normally open contact of the third relay is connected to the control board enable terminal EN of the peristaltic pump, and the second end of the normally open contact of the third relay is connected to the control board ground terminal COM- of the peristaltic pump.

8. A contactless liquid extraction device according to claim 7, Features: The front door body is also provided with a blow pipe button, a lubrication button, a liquid collection button, an air replenishment button, an emergency stop switch, a power switch and an audible and visual alarm. The first ends of the blow pipe button, the lubrication button, the liquid collection button and the air replenishment button are all connected to the negative pole of the power supply, the second ends of the blow pipe button, the lubrication button, the liquid collection button and the air replenishment button are respectively connected to the first ends of the input terminals of the PLC controller in a one-to-one correspondence, the second ends of the input terminals of the PLC controller are all connected to the positive pole of the power supply, the emergency stop switch and the power switch are connected in series between the lithium battery and the DC regulator, the first end of the audible and visual alarm is connected to the negative pole of the power supply, the second end of the audible and visual alarm is connected to the first end of the fourth output terminal of the PLC controller, and the second end of the fourth output terminal of the PLC controller is connected to the positive pole of the power supply.

9. A method for using the contactless liquid collection device according to claim 8, Features: The steps include: S1. Press the power switch to turn on the device and wait for the touch screen to fully display. S2. Connect one end of the liquid collection tube to the solution storage tank to be collected, and wrap the other end of the liquid collection tube around the pump head of the peristaltic pump; S3. The liquid bottle is clamped on the liquid bottle clamping station, and the liquid tube bypassing the pump head of the peristaltic pump and the liquid tube bracket is connected to the liquid bottle; S4. Install the gas supply pipe on the gas supply pipe joint; S5. Open the rear door and then open the gas supply stop valve; S6. Press the blowpipe button, and the PLC controller controls the gas supply solenoid valve to open the first countdown time to purge the gas supply pipe; S7. After the purging is completed, insert the other end of the air supply pipe into the bottom of the solution storage tank to be taken; S8. Press the lubrication button, and the PLC controller controls the air supply solenoid valve and the peristaltic pump to start the second countdown time at the same time, and the solution in the solution storage tank is drawn out of the lubrication tube and delivered to the liquid collection bottle; S9. Seal the liquid collection bottle used in the process of lubricating the pipe and replace it with a new one; S10. Press the liquid taking button, and the PLC controls the air supply solenoid valve and the peristaltic pump to open the liquid taking bottle at the same time after the third countdown time. If you need to take liquid again, replace the liquid taking bottle and press the liquid taking button again to repeat the liquid taking; S11. Pull the liquid pipe in the solution storage tank upward so that the lower end of the liquid pipe is higher than the liquid level of the solution in the solution storage tank; S12. Press the drain button, and the PLC controller controls the gas supply solenoid valve and the peristaltic pump to open the fourth countdown time and seal the liquid bottle, and remove the liquid tube and the gas supply tube; S13. Close the gas supply stop valve.

10. A method for using a contactless liquid collection device according to claim 9, Features: It also includes the steps of refilling the gas tank: The gas storage tank gas replenishment step comprises: S1.1 When the PLC control detects through the pressure transmitter that the pressure of the gas storage tank is lower than the first pressure value, the gas replenishment step is executed; S1.2 Before adding air, connect the air supply pipe to the air supply pipe interface outside the box; S1.3 Open the air supply stop valve after opening the rear door; S1.4 Press the air supply button, and the PLC controller controls the air supply solenoid valve to remain open to replenish the air tank. The pressure of the air tank can be monitored in real time through the touch screen; S1.5 When the PLC controls the pressure transmitter to detect that the pressure of the gas storage tank rises to the second pressure value, the PLC controller closes the gas supply solenoid valve, and controls the sound and light alarm to send out an alarm signal; S1.6 Close the air supply stop valve and close the rear door.

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