CN210448387U - Automatic membrane replacing device for gas particulate matter filtering membrane - Google Patents

Abstract

The utility model discloses an automatic membrane changing device of a gas particulate matter filtering membrane, which adopts the single chip microcomputer control flow logic to drive the automatic membrane changing device to operate; the automatic film changing device is provided with a main body support frame, an upper layer, a middle layer and a lower layer; the upper layer comprises a film storage barrel, an upper jacking module and a shell component; the middle layer comprises a rotating platform, a servo motor, a Hall sensor, a visual resistance screen and a singlechip; the lower layer comprises a lower jacking module, a shell component, a stepping motor guide rail, a film discharging barrel, an electromagnetic valve and a flowmeter. The device during operation, the diaphragm clamp that is equipped with the diaphragm relies on gravity to fall into the revolving stage through-hole from depositing the membrane bucket, drives the diaphragm in the diaphragm clamp and gets into sampling system, is pressed from both sides tightly by the tight module in top, sends to out the membrane bucket via the revolving stage again after accomplishing to realize moving the membrane automatically. The utility model has the advantages of it is controllable to trade membrane cycle, the diaphragm position is accurate, degree of automation is high, the system calorific capacity is little, the sample loss is little, light in weight, small.

Description

Automatic membrane replacing device for gas particulate matter filtering membrane

Technical Field

The utility model belongs to the technical field of atmospheric gas monitoring, a change particulate matter filtration membrane diaphragm technique in atmospheric gas monitoring or particulate matter sampling is related to, especially relate to a gaseous particulate matter filtration membrane's automatic membrane device that trades can realize the automatic change of trace gas and particulate matter sampling in-process particulate matter filtration membrane under laboratory and ambient atmospheric condition.

Background

In the atmosphere monitoring field, most gaseous detecting system need adopt filtration membrane to remove atmospheric particulates in order to protect rear end measurement system, and filtration membrane has certain life, needs the regular change in order to guarantee to measure the accuracy. Meanwhile, a part of the particulate matter offline analysis device needs to adopt a filtering membrane to regularly collect atmospheric particulate matters for subsequent analysis, and the atmospheric measurement and particulate matter sampling system needs to regularly replace the filtering membrane to meet the working requirement. Therefore, the automatic replacement of the particulate matter filtering membrane has very important significance for ensuring the cleanness of the atmospheric gas sampling system and the accuracy and the continuity of the parameter measurement result. The main problems to be solved in designing automatic membrane changing process and mechanical structure are that sampling is not interrupted when the membrane is changed, the rear-end measuring system is protected, the changed membrane is accurately coupled with the sampling system in position, and the airtightness of the sampling system is continuously ensured.

The existing atmospheric gas sampling adopts a manual mode for replacing membranes mostly, the manual membrane replacement is high in cost and poor in operation consistency, the air tightness of a sample system after membrane replacement is difficult to guarantee, meanwhile, membranes are easily polluted by field membrane replacement, and the system is separated from a stable operation state due to the fact that the membrane replacement time is long and long each time. The existing automatic film changing equipment applied to atmospheric sampling is mostly used for collecting particles, the protection of a back-end system during trace gas sampling film changing cannot be met, the air tightness is poor, automatic calibration of positions of a diaphragm and a sample feeding system is lacked after power failure restarting, and changeable environment conditions of field measurement cannot be met.

SUMMERY OF THE UTILITY MODEL

In order to overcome above-mentioned prior art not enough, the utility model provides a pure electric power automation trades membrane device based on single chip microcomputer control, coupling sampling channel simultaneously, trade membrane system, check out test set interface, protective gas module and control panel have high automation, high stability, high accuracy, operating time weak point, small, light in weight and consume energy little advantage, can be used to the gas sampling in-process and trade the membrane sampling.

The principle of the utility model is that: the utility model provides an automatic membrane device that trades by single chip microcomputer control turns into 16 system's file burns record to the single chip microcomputer chip in the step instruction that will trade the membrane flow, carries out accurate control to whole membrane flow of trading through the singlechip. The automatic film changing device comprises a device framework, a shell, a jacking module, a rotating table, a sample inlet area, a film outlet barrel and a film storage barrel. In the film changing device, a film is pressed by a tightly-jacking module taking an upper member/a lower member of a shell as a column, the upper tightly-jacking module is fixed on a device framework, and the film between the upper tightly-jacking module and the lower tightly-jacking module is pushed by moving the lower tightly-jacking module. The two tightly-pushing modules are made of inert materials, so that the wall reaction loss of gas is reduced, and the inside of the tightly-pushing modules is conical to avoid the formation of dead zones of sample introduction gas. The membrane is supported as the carrier by the membrane of independent design, and the carousel is transferred to tight module region clamp formation airtight sampling system in top, the tight module region in top down by depositing the membrane bucket, transfers to membrane play membrane bucket storage by the carousel again after the membrane uses. Wherein deposit all to be 120 contained angles between membrane bucket, the entering appearance district and the play membrane bucket and the revolving stage line of center, revolving stage rotation angle every time is 120, by the accurate control of the servo motor of control revolving stage. Aiming at the particulate matter filtering membrane replacing system, the membrane replacing instruction comprises that the tight-jacking module moves down firstly, then the rotating platform is rotated, an old membrane which is used just after use is conveyed to the membrane outlet barrel position while the rotating platform rotates, a new membrane at the lowest end in the membrane storage barrel is conveyed to the tight-jacking module position, and the tight-jacking module jacks up and down finally. For part of gas detection systems which need to strictly avoid particulate interference, a synthetic air protection system is additionally arranged in the membrane changing process, the function of the system is that when the membrane is changed and the membrane holder is opened, excessive synthetic air is injected into the sample injection system through a control electromagnetic valve, a certain amount of gas is pumped by a rear-end measurement system, and other redundant gas overflows from the upper end of the membrane changer, so that the function of backflushing and cleaning the membrane changing system can be achieved. The detection system connected with the rear end can not pause the sampling process due to the film changing process, and meanwhile, the phenomenon that the film changing process sucks particulate matters to pollute the rear end detection system can be avoided, so that the system is unstable in operation. The instrument can obtain continuous data through the application of the protective gas module, and meanwhile, the real-time protection is realized on the rear-end detection system. Wherein the flow meter can control the flow rate of the synthetic air to meet the requirements of the back-end detection system. The specific membrane replacing process is approximately the same as that of the particulate matter membrane sampling system, the jacking module moves downwards at first, the electromagnetic valve for controlling and protecting synthetic air is opened when the module moves downwards to a proper position, synthetic gas is injected into the detection system connected with the jacking module downwards, the rotary table is rotated to replace the membrane, the jacking module moves upwards and downwards at last, the electromagnetic valve is closed when the module moves upwards to a proper position to stop conveying the synthetic air, and the jacking module moves upwards and downwards to jack the membrane tightly to form sealing. Besides a normal film changing process, a power-off protection measure is added in the program design, the position of the rotary table is accurately positioned by using the Hall sensor before the first film changing of the system power-on every time, the position of the rotary table for loading the film is overlapped with the jacking module, and the rotary table is ensured not to reach the designated position due to sudden power-off in the film changing process, so that the position of the rotary table is mistaken after the system is powered on again, and the normal film changing process cannot be carried out.

The utility model provides a technical scheme is:

the utility model provides an automatic membrane device that trades of gaseous particulate matter filtration membrane, is a pure electric drive automatic membrane device system that trades suitable for gaseous sampling, the operation of system adoption singlechip as flow logic control center drive arrangement. The automatic film changing device is provided with a main body supporting frame, the device can be divided into an upper layer, a middle layer and a lower layer by taking the rotating platform as a boundary, the upper layer comprises a film storage barrel for storing a clean film, an upper jacking module and a shell member thereof, the film storage barrel is connected with the shell of the rotating platform through a bolt, the upper jacking module and the shell member thereof are connected through a spring, and the whole body is connected with the shell of the rotating platform through a bolt; the middle layer comprises a rotating platform for bearing the diaphragm, a servo motor, Hall sensors, a visual resistance screen and a single chip microcomputer circuit board, wherein the rotating platform is fastened with a rotating shaft of the servo motor through bolts and is driven to rotate by the servo motor; the lower floor has included tight module in lower top and shell component, the step motor guide rail, go out the membrane bucket, the solenoid valve, the flowmeter, wherein tight module in lower top is fixed on its shell component through the jackscrew, slip table bolted connection with the step motor guide rail, a tight module removal in top for the drive, make tight module in lower top and tight module in last top press from both sides tight diaphragm seal sampling system, it passes through the bolt fastening on the shell of revolving stage to go out the membrane bucket, a diaphragm that has used is used for depositing, solenoid valve and flowmeter are located the bottommost of lower floor, fix on the main part support frame of lower floor through the bolt, a system for controlling the protective gas. In addition, a membrane clamp is used as a membrane carrier, and the component is independent of the automatic membrane changing device and is not fixedly connected with the device. In the operation process of the device, the membrane is stored in the membrane clamp, enters the rotating platform from the membrane storage barrel, enters the sample injection system and is clamped by the upper/lower jacking module, and is conveyed to the membrane discharge barrel through the rotating platform after use to wait for collection.

The sample injection area comprises an upper tightly-pushing module and a lower tightly-pushing module. Three centrosymmetric circular through holes are respectively arranged on the rotating platform according to the positions of the film storage barrel, the film outlet barrel and a sample injection area formed by the upper/lower jacking modules, and the through holes are used for limiting the position of the film clamp, so that a film in the film clamp is driven to move from the film storage barrel to the sample injection area and then to move into the film outlet barrel in the rotating process; the film storage barrel and the film discharging barrel are respectively positioned above and below the rotating platform, the film clips provided with the films fall into the through holes of the rotating platform from the film storage barrel by virtue of gravity, and the film clips after being used fall into the film discharging barrel by virtue of gravity when being driven to the position above the film discharging barrel by the rotating platform; the upper/lower tightly-pushing modules forming the sample feeding system are positioned above and below the rotating table, wherein the upper tightly-pushing module is connected with a shell component of the upper tightly-pushing module through a spring, the lower tightly-pushing module is connected with a shell component of the lower tightly-pushing module through a jackscrew, the shell component of the lower tightly-pushing module is fixed on a sliding table of a guide rail of the stepping motor, the sliding table is connected with a screw bolt in the guide rail of the stepping motor, when the guide rail of the stepping motor receives an instruction to tightly push the diaphragm, the upper/lower tightly-pushing module can move up for a certain distance until the spring is contracted, the upper/lower tightly-pushing module and the diaphragm clamp are completely compressed to form a closed sample feeding area, and O rings are embedded on the contact surfaces of the upper/lower; the electromagnetic valve for controlling the switch of the protective gas system is arranged at the bottom end of the membrane replacing system, and a shockproof flexible connection is arranged between the platform and the main body support frame and is used for reducing the shock caused by the working of the electromagnetic valve; the flow meter of the protective gas system is used for controlling the flow of the protective gas and is connected with the air inlet of the electromagnetic valve through the Teflon pipe, the air outlet of the electromagnetic valve is connected with the protective gas inlet of the lower jacking module, and the electromagnetic valve is used for controlling the on-off of the protective gas.

The automatic film changing device can also comprise a visual operation resistance screen; the visual operation resistance screen is located the main part support frame side, and the screen back is by single chip microcomputer chip and circuit board of screw fixation, has included a RAM card that is used for storing the membrane time point of trading. The automatic film changing device is powered by an external 220V to 5V adapter, and a power supply interface of the automatic film changing device is fixed on the small platform at the bottom end.

Aiming at the automatic film changing device/system, the automatic film changing device/system is characterized in that: three through-holes that are used for driving the diaphragm clamp on the revolving stage and deposit the tight module in top of membrane bucket, sampling system, go out membrane bucket position one-to-one, rely on servo motor control, the turned angle accuracy is high, the difficult condition that takes place the diaphragm dislocation. Deposit the membrane bucket and go out the membrane bucket and be located the upper and lower side of revolving stage respectively, utilize gravity to accomplish the film clamp from depositing the through-hole that the membrane bucket fell into the revolving stage and finally fall into the process of going out the membrane bucket, saved corresponding mechanical equipment and power consumption. The upper part and the lower part of the rotating platform are respectively protected by the fixed disks on the main body supporting frame, the distance between the two fixed disks just ensures that only one membrane clamp moves between the two fixed disks, and meanwhile, the distance between the rotating platform and the upper fixed disk just ensures that the membrane clamp in the membrane storage barrel cannot fall out of the membrane storage barrel when one membrane clamp is arranged in the through hole of the rotating platform. The single diaphragm replacement operation and the accurate diaphragm moving distance can be realized by the rotary table, the servo motor, the stepping motor guide rail and the Hall sensor.

Aiming at the automatic film changing system, the automatic film changing system is characterized in that: an embedded O ring is arranged on the contact surface of the jacking module and the diaphragm clamp, so that the air tightness of the whole sample feeding system is ensured during sample feeding. The removal of the tight module in top is by step motor guide rail control, and the displacement of step motor guide rail is very accurate, and the error is little between the displacement at every turn, guarantees down that the tight module in top lifting distance at every turn is fixed, guarantees to go up the tight module in top the spring and to apply fixed dynamics to the tight module in top and press from both sides the diaphragm clamp that is located the centre. The contact part of the interior of the upper/lower jacking module and the sampling gas is a cone, the volume is small, the pipeline is straight, the retention time of the gas is short, the loss is small, and the dead zone is avoided.

Aiming at the automatic film changing system, the automatic film changing system is characterized in that: the moving distance of the lower jacking module can be accurately controlled by utilizing the guide rail of the stepping motor. The tight module in top down is fixed in on the slip table of step motor guide rail, and the slip table links to each other with the lead screw in the step motor guide rail, and the distance that the slip table moved on the lead screw is controlled by step motor, and after step motor received the instruction of singlechip transmission, can drive the slip table and push up the tight module down and move up the definite distance along the lead screw and go up the diaphragm clamp in the middle of supreme tight module in top and the tight module complete seal down. After the sealing process is finished, the servo motor does not consume power or generate heat in the non-replacement process. Even the outage trouble appears suddenly, the slip table receives the power chucking of ball on the lead screw, and the position of slip table can not take place to remove, and tight module in top down are still airtight on advancing the appearance, can not lead to the gas leakage phenomenon.

Aiming at the automatic film changing system, the automatic film changing system is characterized in that: after the film changing system is electrified and started again each time, the system can execute the process of automatically calibrating the position of the rotating platform, and the through hole for fixing the film clamp on the rotating platform is ensured to be in the correct position. The correction mode adopts a Hall sensor, and the angular deviation is ensured to be less than 0.1%.

Aiming at the automatic film changing system, the automatic film changing system is characterized in that: be furnished with the protective gas system, thereby the steady operation of incessant instrument of continuous sampling when needs guarantee to trade the membrane can insert protective gas such as synthetic air to the air inlet of solenoid valve, guarantees to trade membrane clearance system suction protective gas through the adjustment flowmeter and avoids the particulate matter pollution rear end detecting system in the environment.

Aiming at the automatic film changing system, the automatic film changing system is characterized in that: the stepping motor and the servo motor which control the rotating platform and the lower jacking module are all low-heating and low-energy-consumption motors, so that stable operation under the condition of outfield high temperature is ensured. All instruction execution is realized through the singlechip, and system stability is good, and is small, light in weight, is furnished with the memory card simultaneously and can store the start-stop time of trading the membrane at every turn, the outfield data processing of being convenient for.

Aiming at the automatic film changing system, the automatic film changing system is characterized in that: the system is provided with the visual resistance screen, so that a user can conveniently modify the number of the diaphragms needing to be replaced and the diaphragm replacement interval time, and the diaphragm replacement number and the diaphragm replacement time can be set randomly according to the user requirements. The single film changing period is less than 15 seconds, and the requirement of high-frequency film changing can be met.

When the automatic atmospheric particulate filtering membrane replacing device suitable for atmospheric sampling works, a singlechip is adopted for logic control, and membrane replacing operation is carried out through a servo motor and a stepping motor guide rail, so that full-automatic membrane replacement is realized; the method comprises the following steps:

1) the motor equipment such as a motor for controlling the rotating platform and the jacking module, an electromagnetic valve, a visual resistance screen and the like are connected with the single chip microcomputer chip, and unified communication and power supply of all electronic equipment in the system are realized. Wherein go up between tight module of top and the main part support frame of trading the membrane system by spring coupling, the migration distance of debugging step motor slide rail makes in the normal sampling time go up/down tight module of top can press from both sides tight diaphragm clamp and no gas leakage.

2) And a protection gas inlet which is connected with a gas outlet of the electromagnetic valve and the lower jacking module is connected with a sample introduction system and a rear end detection system. If protective gas is needed, the gas inlet of the electromagnetic valve is connected with the gas in the steel cylinder, otherwise, the gas inlet of the electromagnetic valve is blocked.

3) And (3) placing a clean diaphragm into the diaphragm clamp, and placing the diaphragm clamp with the clean diaphragm into the diaphragm storage barrel. After the system is connected with a power supply, the number of the diaphragms placed in the diaphragm storage barrel and the time interval for replacing the diaphragms every time are set through the resistance screen, and the time for replacing the diaphragm system single chip microcomputer is confirmed to correspond to the actual time. Before the membrane changing system is started each time, a user is required to complete a self-checking project and click to start the membrane changing system.

4) The logic control of the film changing process is realized by a 16-system file which is burnt into the singlechip chip in advance. The specific process comprises the steps that the jacking module is moved downwards before the film is replaced for the first time, and the position of the rotary table is corrected through the Hall sensor, so that the position offset of the rotary table during the last power failure is avoided; and then moving the jacking module upwards to clamp the diaphragm to start normal sampling. The membrane is arranged in the membrane clamp, is conveyed to a sample injection system consisting of an upper/lower jacking module through a membrane storage barrel through a rotating platform, and is transferred to a membrane discharge barrel after being used. The film clip is moved out of the film storage barrel and enters the film outlet barrel from the rotating platform under the action of self gravity. In the subsequent film changing operation process, the servo motor rotates a certain angle (for example, 120 degrees) each time, and a new film clamp is ensured to replace the previous film clamp and the used film clamp to fall into the film outlet barrel. Aiming at a detection system which needs to use a diaphragm to strictly eliminate the influence of particles, a synthetic air protection system is additionally added in the diaphragm changing process, the working process is that when a jacking module is moved down each time until a diaphragm clamp is just loosened to release the sealing, an electromagnetic valve is opened to inject excessive synthetic air into a sample injection system, and the flow rate of protective air is controlled by a flow meter. And after the film is replaced, the jacking module is moved up and down to be just jacked, and the electromagnetic valve is closed.

5) After all the membranes are replaced, the system stops replacing the membranes, the last membrane is ensured to be in the sample injection system and in a tightly-jacking state, and the sampling is ensured to continue. All the film clips can be taken out by opening the film discharging barrel, and the film pieces in the film clips are replaced for the next use. After the atmospheric sampling work is finished, the memory card can be taken out from the side face of the single chip microcomputer circuit board, and the time for starting/stopping changing the film every time is led out to be used by subsequent analysis data.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model provides a pure electric power is from moving membrane system based on single chip microcomputer control, be applicable to particulate matter sampling or other trace gas sampling in-process and filter atmospheric particulates, at least include the main part support frame of making by the aluminum alloy, bear the revolving stage of diaphragm, be used for depositing the membrane bucket of depositing of clean diaphragm, be used for collecting the play membrane bucket of having used the diaphragm, the shell is two tight modules in top/bottom of cylinder and is used for pressing from both sides tight diaphragm, step motor guide rail slip table, servo motor, hall sensor, visual operation's resistance screen, a single-chip microcomputer, a diaphragm clamp for adorning the diaphragm, a solenoid valve, a flowmeter. The utility model discloses use the singlechip to be electrical apparatus part communication center, through the automatic calibration of the automatic membrane operation of trading of 16 system instruction file control of burning record and revolving stage position before trading the membrane. The utility model discloses the scheme has that it is controllable to trade membrane cycle, diaphragm position accuracy, degree of automation height, electrical apparatus system calorific capacity are little, the sample loss is little, light in weight, characteristics small. The gas measuring system can be helped to automatically work continuously for a long time, and the automation degree of the measuring system is improved.

The utility model has the advantages that:

(one) the utility model discloses be furnished with the protection gas system, let in the protection gas to detecting system at the membrane changing in-process, avoid interrupting the system unstability that the sampling leads to.

(II) the utility model discloses a restart meeting automatic calibration diaphragm position after having contained the outage at every turn in the membrane change flow, the assurance system can deal with the unexpected electric power interruption of outfield.

(III) the utility model discloses a pure electric drive, electrical equipment energy consumption is low, generate heat for a short time, guarantees that long-time operation does not take place overheat protection and breaks off and trade the membrane, and adaptable environmental condition that changes by a wide margin can adopt the ups power to guarantee work to go on under the extreme no electric power condition.

(IV) the utility model discloses well sampling system's gaseous dwell time is short, and the tight module in top down adopts the inert material, and inside is the cone, can effectively reduce the sample loss, avoids gaseous formation blind spot.

(V) the utility model discloses be visual resistive screen with user interaction interface, can touch operation. Meanwhile, a memory card is arranged to store the start/stop time of each film change.

Drawings

FIGS. 1-3 are structural diagrams of an automatic membrane changing device for a gas particulate filtering membrane provided by the present invention;

wherein, fig. 1 and 2 are respectively a left isometric line block diagram and a right isometric line block diagram of the system, and fig. 3 is a structure diagram of a diaphragm clamp; 1-a film storage barrel; 2, discharging the film barrel; 3, a rotating platform; 4, a main body support frame; 5, fixing a disc; 6, a lower fixed disc; 7-a hall sensor; 8, a servo motor; 9-a resistive screen; 10-a core control panel of the singlechip; 11-top tightening module; 12-lower jacking module; 13-step motor guide rail sliding table; 14-a relay module; 15-shielding gas electromagnetic valve; 16-a power supply module; 17-film clamp.

Fig. 4 is a work flow block diagram of the automatic membrane changing device for the gas particulate filtering membrane provided by the present invention.

Detailed Description

The invention will be further described by way of examples, without in any way limiting its scope, with reference to the accompanying drawings.

The utility model provides a pure electric power is from moving membrane system based on single chip microcomputer control, include at least the main part support frame of making by the aluminum alloy, bear the revolving stage of diaphragm, be used for depositing the membrane bucket of depositing of clean diaphragm, be used for collecting the play membrane bucket that has used the diaphragm, the shell is two tight modules in upper/lower top of cylinder and is used for pressing from both sides tight diaphragm, step motor guide rail slip table, servo motor, hall sensor, visual operation's resistance screen, the singlechip, be used for adorning the diaphragm clamp of diaphragm, the solenoid valve, the flowmeter. The utility model discloses use the singlechip to be electrical components communication center, through the automatic calibration of the hexadecimal instruction file control of burning record automatic membrane operation and revolving stage position of trading, utilize the diaphragm clamping to fix the diaphragm and transport the diaphragm, realize the automatic membrane of trading among the gas sampling process.

The specific implementation is as shown in fig. 1, the pure electric automatic film changing system based on the single chip microcomputer control comprises a film storage barrel 1, a film outlet barrel 2, a rotating platform 3, a main body supporting frame 4, an upper fixing disk 5, a lower fixing disk 6, a hall sensor 7, a servo motor 8, a resistance screen 9, a single chip microcomputer core control board 10, an upper tightening module 11, a lower tightening module 12, a stepping motor guide rail sliding table 13, a relay module 14, a shielding gas module 15, a power supply module 16 and a film clamp 17.

The automatic membrane replacing system is established by taking a main body support frame 4 as a frame, the membrane storage barrel 1 is positioned above the upper fixed disk 5, the membrane outlet barrel 2 is positioned below the lower fixed disk 5, and the rotating platform 3 for transferring membranes is arranged in the middle of the upper/lower fixed disks. The rotary table 3 is controlled by a servo motor 8 positioned below the center of the rotary table, and a Hall sensor 7 is arranged on the side surface of the lower fixed disc 6 and used for calibrating the position of the rotary table 3 before starting. The upper tightening module 11 is flexibly connected to the shell of the upper fixing disk 5 through a spring, and the lower tightening module 12 is connected with the sliding table of the guide rail of the stepping motor and is positioned below the lower fixing disk 6. The protective gas system is positioned at the bottom of the main body support frame 4, consists of a relay module 14 and a protective gas module 15, and is connected with a protective gas inlet of the lower jacking module 12 through a Teflon pipe. The power supply module 16 is located at the side of the main body support frame 4.

All electrical equipment in the automatic film changing system is in communication connection with a singlechip core control panel 10 positioned on the side, wherein the control panel 10 is also provided with a memory card interface for storing the start/stop time of each film changing.

The power supply of the system is electrically connected with a conventional 220V alternating current through a power supply module 16, and an air outlet on the lower tightening module 12 is connected with rear-end sampling equipment before the membrane replacement is started. For sampling equipment requiring protective gas to be introduced at a membrane replacement interval, an electromagnetic valve in the protective gas module 15 needs to be connected with a steel cylinder gas, otherwise, the sampling equipment needs to be blocked. The relay module 14 is used for receiving instructions and controlling the on/off of the shielding gas module 15. When the film is replaced, the film is placed into the film clamp 17, the film storage barrel 1 is placed, the number of the films to be replaced and the replacement interval time are set on the visual touch resistance screen 9, and the film replacement system is started after the self-inspection project is completed. After the system is started, the stepping motor guide rail sliding table 13 controls the lower tightening module to move downwards, meanwhile, the relay module 14 opens the shielding gas module to introduce shielding gas, the servo motor 8 controls the rotary table 3 to rotate until the Hall sensor 7 sends out a stop instruction, the rotary table 3 is indicated to be located at the correct position, then the upper tightening module 12 moves downwards to tighten the membrane, and the shielding gas module 15 is closed. After all the membranes are replaced, the last membrane stays between the upper tightening module 11 and the lower tightening module 12 and is clamped tightly, and continuous sampling can be guaranteed under the condition that the system is not updated for a long time.

The used membrane clamp 17 is taken out from the membrane outlet barrel 2, and the clean membrane is replaced for the next use.

The work flow of the present invention is described below by way of specific examples:

the automatic membrane replacement system in this example provides a membrane replacement operation for a sampling system requiring shielding gas.

The power supply module 16 is first electrically connected to a conventional 220V AC power supply, and the solenoid valve in the shielding gas module 15 is connected to the cylinder gas. Before the film is replaced, clean films are firstly placed into the film clips 17 one by one, the film clips 17 are sequentially stacked into the film storage barrel 1, and a sealing cover is tightly covered to prevent dust from entering.

When the film is replaced, the number of the films to be replaced and the replacement interval time are set on the visual touch resistance screen 9, in this example, the number of the replaced films is set to be 10, and the replacement interval time is set to be 2 hours. And (2) carrying out self-checking procedures before starting, wherein the procedures comprise (1) confirming whether protective gas is connected, (2) whether the number of the membranes is updated, (3) whether a replacement interval is set, (4) whether the time of the chip is calibrated, and starting the membrane replacement system after the completion.

And after the system is started, the stepping motor guide rail sliding table 13 controls the lower tightening module 11 to move downwards, meanwhile, the relay module 14 opens the shielding gas module 13 and introduces synthetic air shielding gas with a certain flow rate, for example, 2L/min, the servo motor 8 controls the rotary table 3 to drive the membrane clamp 17 to rotate until the Hall sensor 7 sends a stop instruction, the rotary table 3 is shown to be located at the correct position, the new membrane clamp 17 is in place, then, the upper tightening module 12 is moved downwards to tighten the membrane, and the shielding gas module 15 is closed. In the following normal film changing process, the servo motor 8 rotates 120 degrees every time after the lower tightening module 12 releases the film clamp 17, so that a new film enters the sampling system, and meanwhile, an old film falls into the film outlet barrel 2 to be collected.

After all the membranes are replaced, the last membrane stays between the upper tightening module 11 and the lower tightening module 12 and is clamped, so that continuous sampling can be ensured under the condition that the system is not updated for a long time, and the membrane replacing program is not started until the membrane replacing system is restarted. The used membrane clamp 17 is taken out from the membrane outlet barrel 2, and the clean membrane is replaced for the next use.

It is noted that the disclosed embodiments are intended to aid in further understanding of the invention, but those skilled in the art will appreciate that: various substitutions and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the present invention should not be limited to the embodiments disclosed, and the scope of the present invention is defined by the appended claims.

Claims (8)

1. A pure electric-driven automatic membrane changing device for a gas particulate matter filtering membrane adopts a single chip microcomputer circuit board as a flow logic control center and is used for driving the automatic membrane changing device to operate; the automatic film changing device is provided with a main body support frame which comprises an upper layer, a middle layer and a lower layer;

the upper layer comprises a film storage barrel for storing the clean film, an upper jacking module and a shell member thereof; the film storage barrel is connected with the shell of the rotating platform at the middle layer; the upper jacking module and the shell member thereof are connected into a whole through a spring, and the upper jacking module and the shell member are connected with the shell of the rotating platform;

the middle layer comprises a rotating platform for bearing the diaphragm, a servo motor, a Hall sensor, a visual resistance screen and a singlechip; the rotary table is fastened with a rotary shaft of the servo motor through a bolt and is driven to rotate through the servo motor; the Hall sensor is arranged on the side surface of the rotating platform and fixed on the main body supporting frame; the visual resistance screen and the single chip microcomputer circuit board are fastened on the outer side of the main body supporting frame;

the lower layer comprises a lower jacking module and a shell component thereof, a stepping motor guide rail, a film discharging barrel, an electromagnetic valve and a flowmeter; the lower tightening module is fixed on a shell component of the lower tightening module through a jackscrew, and the shell component of the lower tightening module is connected with a sliding table of a guide rail of the stepping motor and is used for driving the lower tightening module to move so as to clamp a diaphragm to seal the sample feeding system; the film discharging barrel is fixed on the shell of the rotating platform and used for storing used films; the electromagnetic valve and the flowmeter are positioned at the bottommost part of the lower layer, are fixed at the lower part of the main body support frame and are used for controlling the protective gas system;

the automatic film changing device also comprises a film clamp used as a film carrier, and the film clamp is used for storing the film;

the rotating platform is provided with a through hole for limiting the position of the membrane clamp; in the device operation process, the diaphragm clamp provided with the diaphragm falls into the through hole of the rotary table from the diaphragm storage barrel by means of gravity, the diaphragm in the diaphragm clamp is driven by the through hole to enter the sample introduction system and is clamped by the upper jacking module and the lower jacking module, and the diaphragm clamp is conveyed to the diaphragm discharge barrel by the rotary table after being used, so that automatic diaphragm replacement is realized.

2. The apparatus according to claim 1, wherein the sample injection system comprises an upper tightening module and a lower tightening module respectively located above and below the rotary table; the upper tightening module is connected with the shell component through a spring; the lower tightening module and the shell construction thereof are connected through a jackscrew; fixed on the sliding table of the guide rail of the stepping motor; when the stepping motor guide rail needs to tightly support the diaphragm, the upper supporting module is moved upwards and downwards until the spring is tightened, and the upper supporting module, the lower supporting module and the diaphragm clamp are completely pressed to form a closed sample injection area; and O rings are embedded on the contact surfaces of the upper tightening module and the lower tightening module with the membrane clamp and are used for ensuring the air tightness of a sample introduction system.

3. The automatic film changing device as claimed in claim 1, wherein the electromagnetic valve is used for controlling the on-off of the shielding gas and is arranged on a small platform at the bottom end of the film changing system; the small platform is connected with the main body support frame in a shockproof mode, and the shockproof soft connection is used for reducing the shock of the electromagnetic valve during working; the flow meter is used for controlling the flow of protective gas and is connected with the air inlet of the electromagnetic valve through a Teflon pipe; the air outlet of the electromagnetic valve is connected with the protective air inlet of the lower jacking module.

4. The automatic film changer of claim 1, wherein the automatic film changer further comprises a visually-operable resistive screen; the visualized operation resistance screen is positioned on the side surface of the main body support frame; the back of the screen of the visual operation resistance screen is fixed with the single chip microcomputer chip and the circuit board through screws, and the visual operation resistance screen comprises a memory card used for storing the film changing time point.

5. The apparatus according to claim 1, wherein the rotary table has three through holes for defining the film clamp positions; the three through holes correspond to the film storage barrel, the jacking module of the sample feeding system and the film discharging barrel one by one and are controlled by a servo motor; the automatic membrane changing device is powered by an external 220V to 5V adapter, and a power supply interface is fixed at the bottom end of the device.

6. The apparatus according to claim 1, wherein the upper and lower packing blocks have a conical shape in the inner portion contacting the sample gas, and have a small volume and a straight pipe, so that the gas has a short retention time and a small loss, and a dead zone is prevented from being formed.

7. The automatic film changing device according to claim 1, wherein the lower tightening module is fixed on a customized sliding table and connected with a lead screw guide rail, and the moving distance of the lower tightening module is accurately controlled through a stepping motor guide rail; the stepping motor drives the sliding table and the lower jacking module to move upwards for a determined distance along the screw rod until the upper jacking module and the lower jacking module completely seal the middle diaphragm clamp.

8. The automatic film changing device as claimed in claim 1, wherein the automatic film changing device is provided with a protective gas system, protective gas is introduced into a gas inlet of the electromagnetic valve, and protective gas is pumped into the film changing gap by adjusting the flow meter; the motors for controlling the rotating platform and the lower jacking module are low-heating and low-energy-consumption motors.

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