An automatic membrane changing system for an oscillating microbalance dust concentration measuring instrument

Abstract

The present invention discloses an automatic membrane changing system for a dust concentration measuring instrument using an oscillating balance method. The system includes an overall machine frame and a traveling mechanism with X, Y, and Z axes; the X-axis and Y-axis traveling mechanisms are both installed on the overall machine frame, the Z-axis traveling mechanism is installed on the Y-axis traveling mechanism, and an oscillating balance, an old membrane collection box, and a filter membrane box are arranged on the X-axis traveling mechanism to be driven to move horizontally; above the oscillating balance, a first or second air inlet device for cooperating with the oscillating balance is provided. The system of the present invention can accurately remove the used old filter membrane and accurately replace it with a new unused filter membrane, which can solve the problem of inaccurate sampling results caused by manual membrane changing, and save membrane changing time, making the sampling work more efficient and accurate; in cooperation with two dust air inlet control devices, it realizes on-line detection, real-time monitoring of the ambient dust concentration, and timely replacement of a new filter membrane when the conductivity of the filter membrane weakens and affects the measurement result.

Description

Technical Field

[0001] The present invention relates to an automatic dust collection film processing system in the field of dust concentration measurement, specifically an automatic film changing system for an oscillating microbalance dust concentration measuring instrument. Background Art

[0002] At present, there are many kinds of instruments for monitoring dust concentration in our country. According to different working environments and requirements, the most suitable instrument can be selected. Due to different monitoring principles, the corresponding instruments are also diverse. Generally speaking, they can be divided into three categories: dust samplers, dust concentration sensors, and dust detectors. Among these three instruments, the dust sampler has the characteristics of relatively small volume, convenient carrying, accurate data collection, etc., so it is currently the most commonly used instrument for real-time monitoring of dust concentration in production sites.

[0003] After the filter membrane of the dust concentration measuring instrument works for a period of time, its conductivity will weaken, affecting the measurement result and needing to be replaced in time. The currently commonly used method is manual film changing. During the film changing process, any careless action of the operator will cause inaccurate monitoring results and cannot truly reflect the change of dust concentration in the air of the production site. Therefore, using a dust concentration measuring instrument is not an easy task because the collected data must be real and should not have large errors, otherwise it will not be able to truly reflect the dust concentration in the air of the workplace. Therefore, the work of dust sampling must be carried out by specially trained operators.

[0004] However, even professional staff will inevitably make some mistakes during operation. The main problems include the filter membrane being contaminated, the filter membrane not being de-electrified before weighing, the filter membrane not being dried before weighing, sampling clamp installation problems, etc.

[0005] It can be seen that whether the filter membrane can be correctly installed and whether the dust on the filter membrane after sampling can be ensured not to be lost are the key factors affecting the success of dust sampling by the dust sampler. When it is necessary to analyze different particulate matters and conduct continuous or multi-filter membrane interval sampling, simultaneous sampling is required at this time, and multiple sampling instruments are needed; moreover, it is required that the sampling personnel replace the filter membrane regularly, which greatly increases the labor intensity of the operator. This will affect the accuracy of data analysis and increase the sampling cost at the same time. Summary of the Invention

[0006] In order to solve the problems in the background art and achieve on-line detection of dust concentration, the present invention proposes an automatic film changing system for an oscillating microbalance dust measuring instrument, which saves manpower input, reduces the adverse effects brought by manual film changing, and improves sampling accuracy.

[0007] In order to achieve the purpose of the present invention, the present invention adopts the following technical solutions:

[0008] 1. An automatic membrane changing system for an oscillating balance type dust concentration measuring instrument:

[0009] The system includes the overall machine frame of the automatic membrane changing system and the X, Y, and Z-axis traveling mechanisms installed on the overall machine frame; the X-axis traveling mechanism and the Y-axis traveling mechanism are both installed on the overall machine frame, the Z-axis traveling mechanism is installed on the Y-axis traveling mechanism, and the oscillating balance, the old membrane collection box, and the filter membrane box are arranged on the X-axis traveling mechanism and driven by the X-axis traveling mechanism to move horizontally; a first air inlet device or a second air inlet device for cooperating with the oscillating balance is arranged above the oscillating balance.

[0010] The X-axis traveling mechanism includes an X-axis motor, a motor seat for fixing the X-axis motor, and a motor seat bracket for installing the motor seat. The motor seat bracket is fixedly installed on the overall machine frame of the automatic membrane changing device; the output shaft of the X-axis motor is coaxially connected to the ball screw through a coupling.

[0011] X-axis slide rails are arranged on both sides of the ball screw. The two ends of the bottom of the X-axis moving base plate are slidably installed on the X-axis slide rails on both sides of the ball screw through sliders. A lead screw nut is fixed in the middle of the bottom of the X-axis moving base plate, and the lead screw nut is sleeved on the ball screw through a thread.

[0012] The oscillating balance, the old membrane collection box, and the filter membrane box are arranged on the X-axis moving base plate.

[0013] The Y-axis traveling mechanism includes a Y-axis motor, a Y-axis motor bracket for fixing the Y-axis motor, a driving pulley, and a driven pulley; the Y-axis motor bracket is installed on the overall machine frame. The driving pulley at one end is installed on the output shaft of the Y-axis motor, and the driven pulley at the other end is hingedly installed on the overall machine frame through a pulley bracket. The driving pulley and the driven pulley are connected by belt drive, and the Z-axis traveling mechanism is installed on the belt.

[0014] The Z-axis traveling mechanism includes a Z-axis motor fixing plate, a Z-axis motor installed on the Z-axis motor fixing plate, a Z-axis swing arm, and two groups of Z-axis slide rail assemblies installed on the Z-axis motor fixing plate; the Z-axis motor fixing plate is installed on the belt of the Y-axis traveling mechanism. The output shaft of the Z-axis motor is horizontally arranged. The output shaft of the Z-axis motor and the middle part of the Z-axis swing arm are coaxially fixed. The Z-axis swing arm is located above the two groups of Z-axis slide rail assemblies, and the two ends of the Z-axis swing arm are used to respectively push the movement of the two groups of Z-axis slide rail assemblies.

[0015] Each set of the Z-axis slide rail assembly includes a Z-axis slide rail, a Z slider slidably mounted on the Z-axis slide rail, a Z suction nozzle joint mounted on the Z slider, a Z-axis suction nozzle, and a Z-axis filter membrane identification sensor. The Z-axis slide rail is vertically arranged and fixed on the side of the Z-axis motor fixing plate. The lower end of the Z suction nozzle joint is mounted with the Z-axis suction nozzle, and the Z-axis filter membrane identification sensor is mounted on the side of the Z-axis suction nozzle. The Z-axis filter membrane identification sensor is used to detect downward whether there is a filter membrane directly below the Z-axis suction nozzle; the Z-axis slide rails of the two sets of Z-axis slide rail assemblies are arranged in parallel at intervals; both ends of the Z-axis swing arm are respectively connected to the Z sliders of the two sets of Z-axis slide rail assemblies, and the operation of the Z-axis motor drives the Z-axis swing arm to rotate to drive the Z suction nozzles of the two sets of Z-axis slide rail assemblies to move alternately along their respective Z-axis slide rails.

[0016] II. An automatic film changing method for an automatic film changing system, the method comprising the following steps:

[0017] Step 1: Raise the air inlet device so that the flange copper sleeve of the air inlet device is separated from the flange copper sleeve seat of the oscillating balance to disconnect the air path, then reset the origin of the X, Y, and Z-axis traveling mechanisms, wait for the film changing instruction, and execute Step 2 after receiving the film changing instruction;

[0018] Step 2: First, the X-axis traveling mechanism works. The X-axis motor rotates to drive the X-axis moving bottom plate to move in the direction of the X-axis slide rail, so that the filter membrane on the oscillating balance mounted on the X-axis moving bottom plate is directly below the Z1-axis suction nozzle of the first set of Z-axis slide rail assemblies of the Y-axis traveling mechanism;

[0019] Step 3: Start the Y-axis traveling mechanism to work. The Y-axis motor rotates to drive the Z1-axis suction nozzle of the first set of Z-axis slide rail assemblies on the Z-axis motor fixing plate to move to directly above the center of the filter membrane on the oscillating balance, and then the Z1-axis filter membrane identification sensor identifies the filter membrane on the oscillating balance;

[0020] Immediately afterwards, the Z-axis traveling mechanism works. The Z-axis motor rotates to drive the Z-axis swing arm to rotate, and then one end of the Z-axis swing arm drives the Z1-axis suction nozzle of the first set of Z-axis slide rail assemblies to move down to contact the filter membrane and suck up the filter membrane and then rise. This filter membrane is used as the old filter membrane after sampling;

[0021] Continue to work the Y-axis traveling mechanism. The Y-axis motor rotates to drive the Z1-axis suction nozzle of the first set of Z-axis slide rail assemblies on the Z-axis motor fixing plate to move to directly above the waste film collection box, and then control the Z1-axis suction nozzle of the first set of Z-axis slide rail assemblies to release and drop the sampled old filter membrane into the waste film collection box;

[0022] Step 4: The X-axis traveling mechanism and the Y-axis traveling mechanism operate. The X-axis moving baseplate moves, and the Y-axis motor rotates, causing the Z2-axis suction nozzle of the second set of Z-axis slide rail assemblies to face downward and align with a filter membrane on the filter membrane cassette. The Z2-axis filter membrane recognition sensor scans each grid until the filter membrane is recognized, and then the filter membrane is sucked up as a new filter membrane.

[0023] Then, the X-axis traveling mechanism and the Y-axis traveling mechanism operate. The X-axis moving baseplate moves, and the Y-axis motor rotates, causing the Z2-axis suction nozzle of the second set of Z-axis slide rail assemblies to move to the center of the flange copper sleeve seat of the oscillating balance, facing downward. Then, the Z-axis traveling mechanism operates. The Z-axis motor rotates to drive the Z-axis swing arm to rotate. Further, one end of the Z-axis swing arm drives the Z2-axis suction nozzle of the second set of Z-axis slide rail assemblies to move downward and gently place the new filter membrane on the tray of the oscillating balance and then release it.

[0024] After completion, reset again and return to the origin, and the entire set of film-changing actions is completed.

[0025] Step 5: After waiting for the film-changing instruction to end, next, perform dust concentration sampling:

[0026] First, the X-axis motor rotates to drive the X-axis moving baseplate to move in the X-axis direction, causing the flange copper sleeve seat on the oscillating balance installed on the X-axis moving baseplate to move directly below the flange copper sleeve on the air intake device.

[0027] Immediately afterwards, let the flange copper sleeve descend along the intake pipe to fit onto the flange copper sleeve seat on the oscillating balance, and then perform sampling of the ambient dust concentration to achieve the functions of online monitoring and automatic film changing.

[0028] The motor mentioned above can be a stepper motor or a servo motor.

[0029] The frame mentioned above can be made of aluminum profiles or aluminum frames and other iron frames.

[0030] The beneficial effects and features of the present invention are:

[0031] The system of the present invention controls the motors of the X, Y, and Z axes, thereby driving the dust concentration measuring instrument in the X-axis direction and the entire set of Z-axis suction nozzle assemblies installed on the Y-axis, enabling accurate removal of the used filter membrane after sampling and accurate replacement with a new unused filter membrane. It solves the problem of inaccurate sampling results caused by manual film changing, saves film-changing time, and makes the sampling work more efficient and accurate.

[0032] The system of the present invention can automatically identify new and used filter membranes and can accurately remove and install them.

[0033] The system of the present invention is combined with two dust intake control devices to achieve on-line detection and real-time monitoring of the ambient dust concentration, and to timely replace a new filter membrane when the conductivity of the filter membrane weakens and affects the measurement result. In the whole set of devices for measuring the dust concentration by an oscillating balance, the filter membrane stored in the filter membrane box can achieve continuous monitoring of the dust concentration for at least one week, reducing the human and material costs for dust concentration monitoring. Description of the Drawings

[0034] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0035] Figure 2 is a schematic diagram of the structures of the various components of the whole machine of the present invention;

[0036] Figure 3 is a schematic diagram of the main components on the X-axis of the present invention;

[0037] Figure 4 is a schematic diagram of the main components on the Y-axis of the present invention;

[0038] Figure 5 is a schematic diagram of the main components on the Z-axis of the present invention;

[0039] Figure 6 is a schematic diagram of the intake control electromagnet device of the present invention;

[0040] Figure 7 is a schematic diagram of the intake control electric device of the present invention;

[0041] Figure 8 is a schematic diagram of the structures of the waste membrane box and the filter membrane box of the present invention;

[0042] Figure 9 is a schematic diagram of the internal structure of the oscillating balance of the present invention;

[0043] Figure 10 is a schematic diagram of the structure of the first intake device;

[0044] Figure 11 is a schematic diagram of the lifting part structure of the first intake device;

[0045] Figure 12 is a schematic diagram of the internal structure of the oscillating balance of the first intake device;

[0046] Figure 13 is a schematic diagram of the structure of the second intake device;

[0047] Figure 14 is a schematic diagram of the lifting part structure of the second intake device;

[0048] Figure 15 is a schematic diagram of the internal structure of the oscillating balance of the second intake device.

[0049] Description of reference numerals in the drawings: 1. Whole machine frame; 2. X-axis motor; 3. Motor base; 4. Motor base bracket; 5. Coupling; 6. X-axis moving bottom plate; 7. Bearing seat; 8. Ball screw; 9. Oscillating balance; 10. Old film collection box; 11. Filter membrane box; 12. Y-axis motor; 13. Driving pulley; 14. Driven pulley; 15. Pulley bracket; 16. Y-axis slide rail; 17. Z-axis motor fixing plate; 18. Z-axis motor; 19. Z1 slide rail; 20. Z1 slider; 21. Z1 nozzle joint; 22. Z1-axis nozzle; 23. Z1-axis filter membrane identification sensor; 24. Z2 slide rail; 25. Z2 slider; 26. Z2 slider; 27. Z2-axis nozzle; 28. Z2-axis filter membrane identification sensor; 29. Z-axis swing arm; 30. Filter membrane; 31. X-axis slide rail; 32. Y-axis motor bracket; 33. Air inlet pipe; 34. Flange copper bushing; 35. Flange copper bushing seat; 36. Oscillating tube; 37. Tray. A. Z-axis traveling mechanism; B. First air inlet device; C. Second air inlet device;

[0050] B01. Electromagnet push rod bracket; B02. First electromagnet push rod; B03. Second electromagnet push rod; B04. Embedded flange copper bushing bracket; B05. Embedded flange copper bushing; B06. Dust inlet pipe; B07. Round flange copper bushing; B08. Filter membrane; B09. Flange copper bushing seat; B10. Tray; B11. Oscillating tube;

[0051] C01. Micro electric telescopic rod bracket; C02. Micro electric telescopic rod; C03. First fixing bolt; C04. Second fixing bolt; C05. Compression spring; C06. Copper bushing bracket; C07. Dust inlet pipe; C08. Round flange copper bushing; C09. Embedded flange copper bushing; C010. Tray; C011. Flange copper bushing seat; C012. Filter membrane; C013. Oscillating tube. Detailed implementation manners

[0052] The present invention will be further described in detail below in conjunction with the attached Figure 1-9 drawings. The technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0053] As Figure 1 and Figure 2As shown in the figure, the specifically implemented system includes a whole machine frame 1, an X-axis motor 2, a motor base 3, a motor base bracket 4, a coupling 5, an X-axis moving bottom plate 6, a bearing block 7, a ball screw 8, an oscillating balance 9, an old film collection box 10, a filter film box 11, a Y-axis motor 12, a driving pulley 13, a driven pulley 14, a pulley bracket 15, a Y-axis slide rail 16, a Z-axis motor fixing plate 17, a Z-axis motor 18, a Z1 slide rail 19, a Z1 slider 20, a Z1 nozzle joint 21, a Z1-axis nozzle 22, a Z1-axis filter film identification sensor 23, a Z2 slide rail 24, a Z2 slider 25, a Z2 slider 26, a Z2-axis nozzle 27, a Z2-axis filter film identification sensor 28, a Z-axis swing arm 29, a filter film 30, and an X-axis slide rail 31, a Y-axis motor bracket 32.

[0054] It includes a whole machine frame 1 of an automatic film changing system and a traveling mechanism installed on the X, Y, and Z axes of the whole machine frame 1; the X-axis traveling mechanism and the Y-axis traveling mechanism are both installed on the whole machine frame 1, the Z-axis traveling mechanism is installed on the Y-axis traveling mechanism, and the oscillating balance 9, the old film collection box 10, and the filter film box 11 are arranged on the X-axis traveling mechanism and are driven by the X-axis traveling mechanism to move horizontally; above the oscillating balance 9 on the X-axis moving bottom plate 6 of the X-axis traveling mechanism, there is a first air inlet device B or a second air inlet device C for cooperating with the oscillating balance 9, as Figure 6 and Figure 7 shown.

[0055] As Figure 2 and Figure 3 shown, the X-axis traveling mechanism includes an X-axis motor 2, a motor base 3 for fixing the X-axis motor 2, and a motor base bracket 4 for installing the motor base 3. The motor base bracket 4 is fixedly installed on the whole machine frame 1 of the automatic die changing device; the output shaft of the X-axis motor 2 is coaxially connected to the ball screw 8 through a coupling 5. The two ends of the ball screw 8 are supported and installed on the whole machine frame 1 through bearing blocks 7. The ball screw mechanism is composed of two bearing blocks 7 fixed on the whole machine frame 1 and a ball screw 8 installed in the bearing blocks 7.

[0056] On both sides of the ball screw 8, there are X-axis slide rails 31. The X-axis slide rails 31 are fixed to the whole machine frame 1. The two ends of the bottom of the X-axis moving bottom plate 6 are slidably installed on the X-axis slide rails 31 on both sides of the ball screw 8 through sliders. In the middle of the bottom of the X-axis moving bottom plate 6, a lead screw nut is fixed, and the lead screw nut is sleeved on the ball screw 8 through a thread;

[0057] The movement in the direction of the X-axis slide rail 31 is achieved by connecting the X-axis motor 2 and the ball screw mechanism through a coupling 5. When the X-axis motor 2 operates, it drives the X-axis moving bottom plate 6 to move under the guidance of the X-axis slide rail 31 through a lead screw nut sliding pair.

[0058] The oscillating balance 9, the old film collection box 10, and the filter film box 11 are arranged on the X-axis moving bottom plate 6; as Figure 8As shown in the figure, the oscillating balance 9 is a device for detecting dust concentration by filtering membrane deposition. The old membrane collection box 10 is used to collect the old filter membrane 30 replaced from the oscillating balance 9, and the filter membrane box 11 is used to store the new filter membrane 30 replaced for the oscillating balance 9.

[0059] The movement of the X-axis moving base plate 6 drives the movement of the oscillating balance 9, the old membrane collection box 10 and the filter membrane box 11 above.

[0060] As Figure 4 shown in the figure, the Y-axis traveling mechanism includes a Y-axis motor 12, a Y-axis motor bracket 32 for fixing the Y-axis motor 12, a driving pulley 13 and a driven pulley 14; the Y-axis motor bracket 32 is installed on the whole machine frame 1, and the Y-axis motor 12 is installed on the whole machine frame 1 through the Y-axis motor bracket 32; the Y-axis traveling mechanism contains two belt pulleys, and the two belt pulleys are respectively distributed at both ends of the traveling mechanism. The driving pulley 13 at one end is installed on the output shaft of the Y-axis motor 12, and the driven pulley 14 at the other end is hinged and installed on the whole machine frame 1 through a pulley bracket 15. The driving pulley 13 and the driven pulley 14 are connected by belt drive, and the Z-axis traveling mechanism A is installed on the belt, and then the whole Z-axis traveling mechanism A is driven to move in the direction of the Y-axis slide rail 16 through the belt.

[0061] As Figure 5 shown in the figure, the Z-axis traveling mechanism A includes a Z-axis motor fixing plate 17, a Z-axis motor 18 installed on the Z-axis motor fixing plate 17, a Z-axis swing arm 29 and two groups of Z-axis slide rail assemblies installed on the Z-axis motor fixing plate 17; the Z-axis motor fixing plate 17 is installed on the belt of the Y-axis traveling mechanism, the output shaft of the Z-axis motor 18 is horizontally arranged, the output shaft of the Z-axis motor 18 is parallel to the ball screw 8, the output shaft of the Z-axis motor 18 and the middle part of the Z-axis swing arm 29 are coaxially fixed, the Z-axis swing arm 29 is located above the two groups of Z-axis slide rail assemblies, and both ends of the Z-axis swing arm 29 are used to respectively push the movement of the two groups of Z-axis slide rail assemblies.

[0062] Each set of Z-axis slide rail assemblies includes Z-axis slide rails 19 / 24, Z-sliders 20 / 25 slidably mounted on the Z-axis slide rails 19 / 24, Z-nozzle connectors 21 / 26 mounted on the Z-sliders 20 / 25, Z-axis nozzles 22 / 27, and Z-axis filter membrane identification sensors 23 / 28. The Z-axis slide rails 19 / 24 are vertically arranged and fixed to the side of the Z-axis motor fixing plate 17. The lower end of the Z-nozzle connector 21 / 26 mounts the Z-axis nozzle 22 / 27. The Z-axis nozzle 22 / 27 faces downward for sucking the filter membrane. The Z-axis filter membrane identification sensor 23 / 28 is mounted on the side of the Z-axis nozzle 22 / 27 and is used to detect downward whether there is a filter membrane 30 directly below the Z-axis nozzle 22 / 27. The Z-axis slide rails 19 / 24 of the two sets of Z-axis slide rail assemblies are arranged in parallel at intervals, and are respectively arranged along the Z1-axis and the Z2-axis, divided into the Z1 slide rail 19 on the Z1-axis and the Z2 slide rail 24 on the Z2-axis. Moreover, the Z-axis nozzles 22 / 27 of the two sets of Z-axis slide rail assemblies have different functions. The two ends of the Z-axis swing arm 29 are respectively connected to the Z-sliders 20 / 25 of the two sets of Z-axis slide rail assemblies. The operation of the Z-axis motor 18 drives the Z-axis swing arm 29 to rotate, thereby driving the Z-axis nozzles 22 / 27 of the two sets of Z-axis slide rail assemblies to move alternately along their respective Z-axis slide rails 19 / 24, realizing the movement in the Z-axis direction.

[0063] Specifically,

[0064] The first set of Z-axis slide rail assembly is the Z1-axis slide rail assembly, including the Z1 slide rail 19, the Z1-slider 20 slidably mounted on the Z1 slide rail 19, the Z1-nozzle connector 21 mounted on the Z1-slider 20, the Z1-axis nozzle 22, and the Z1-axis filter membrane identification sensor 23. The Z1 slide rail 19 is vertically arranged and fixed to the side of the Z-axis motor fixing plate 17. The lower end of the Z1-nozzle connector 21 mounts the Z1-axis nozzle 22. The Z1-axis nozzle 22 faces downward for sucking the filter membrane. The Z1-axis filter membrane identification sensor 23 is mounted on the side of the Z1-axis nozzle 22 and is used to detect downward whether there is a filter membrane 30 directly below the Z1-axis nozzle 22.

[0065] The second set of Z-axis slide rail assembly is the Z2-axis slide rail assembly, including the Z2 slide rail 24, the Z2-slider 25 slidably mounted on the Z2 slide rail 24, the Z2-nozzle connector 26 mounted on the Z2-slider 25, the Z2-axis nozzle 27, and the Z2-axis filter membrane identification sensor 28. The Z2 slide rail 24 is vertically arranged and fixed to the side of the Z-axis motor fixing plate 17. The lower end of the Z2-nozzle connector 26 mounts the Z2-axis nozzle 27. The Z2-axis nozzle 27 faces downward for sucking the filter membrane. The Z2-axis filter membrane identification sensor 28 is mounted on the side of the Z2-axis nozzle 27 and is used to detect downward whether there is a filter membrane 30 directly below the Z2-axis nozzle 27.

[0066] Among them, the functions of the Z1-axis nozzle 22 and the Z2-axis nozzle 27 are different. One is to pick up the old filter membrane 30 after the dust sampling is completed, and the other is to pick up the new filter membrane 30 on the filter membrane cassette 11.

[0067] The Z-axis swing arm 29 installed on the Z-axis motor 18 is connected to the Z1 slider 20 and the Z2 slider 25. Thus, by controlling the rotation of the Z-axis motor 18, the Z1 nozzle 22 and the Z2-axis nozzle 27 are driven to move alternately along their respective Z1-axis slide rails 19 and Z2-axis slide rails 24, both moving in the Z-axis direction. This can drive the Z1-axis nozzle 22 and the Z2-axis nozzle 27 to move for alternate work with different functions.

[0068] The oscillating balance 9 has a flange copper sleeve seat 35; both the first air inlet device B or the first air inlet device C have an air inlet pipe 33 and a flange copper sleeve 34.

[0069] When membrane replacement needs to be performed, the X-axis traveling mechanism is driven to work, driving the X-axis moving bottom plate 6 to move directly below the Y-axis traveling mechanism;

[0070] When performing dust concentration measurement, the X-axis traveling mechanism is driven to work, driving the X-axis moving bottom plate 6 to move directly below the first air inlet device B or the first air inlet device C, so that the flange copper sleeve seat 35 of the oscillating balance 9 is located directly below the air inlet pipe 33 of the first air inlet device B or the first air inlet device C for sampling.

[0071] The Y-axis traveling mechanism is driven to work, moving above the old membrane collection box 10 or the filter membrane cassette 11, and then the Z-axis traveling mechanism is driven to work, driving the nozzle to pick up the filter membrane 30, realizing picking up or releasing the filter membrane 30.

[0072] In specific implementation, through the movement cooperation among the X, Y, and Z axis traveling mechanisms, the automatic membrane replacement process of the oscillating balance 9 and the process of entering the sampling air intake are realized.

[0073] As Figure 10 shown, in specific implementation, the first air inlet device B as a whole includes an electromagnet push rod support B01, a first electromagnet push rod B02, a second electromagnet push rod B03, an embedded flange copper sleeve support B04, an embedded flange copper sleeve B05, a dust inlet pipe B06, a round flange copper sleeve B07, a filter membrane B08, a flange copper sleeve seat B09, a tray B10, and an oscillating tube B11.

[0074] The main body of the first intake device B includes an electromagnet push rod bracket B01, an embedded flange copper bushing B05, a dust intake pipe B06, a round flange copper bushing B07, and an electromagnet push rod assembly; the intake control electric device is located above the oscillating balance, the dust intake pipe B06 is vertically arranged, the upper end of the dust intake pipe B06 is fixedly sleeved in the round flange copper bushing B07, the round flange copper bushing B07 is fixed to the electromagnet push rod bracket B01, the lower end of the dust intake pipe B06 is movably sleeved with an embedded flange copper bushing B05, and the lifting is realized through the hard guidance of the dust intake pipe B06 on the embedded flange copper bushing B05, and at the same time, the intake control and membrane replacement are realized. The lower end of the embedded flange copper bushing B05 is fixed to the embedded flange copper bushing bracket B04, both sides of the embedded flange copper bushing B05 are connected through the electromagnet push rod assembly and the electromagnet push rod bracket B01, an oscillating balance is arranged below the embedded flange copper bushing B05, and the lifting of the embedded flange copper bushing B05 is accurately controlled through the electromagnet push rod assembly to realize the intake control of the oscillating balance.

[0075] The embedded flange copper bushing bracket B04 is fixedly connected to the embedded flange copper bushing B05, and the embedded flange copper bushing B05 is movably sleeved on the dust intake pipe B06 and moves up and down along the dust intake pipe B06.

[0076] As Figure 10 and Figure 11 shown, the electromagnet push rod assemblies located on both sides of the embedded flange copper bushing B05 are symmetrically arranged on both sides with the dust intake pipe B06 as the center.

[0077] Each electromagnet push rod assembly includes an electromagnet push rod B02 / B03. The body of the electromagnet push rod B02 / B03 is fixed to the electromagnet push rod bracket B01, and the output rod end of the electromagnet push rod B02 / B03 faces downward and is fixedly connected to the embedded flange copper bushing bracket B04.

[0078] In such a structure, the volume and weight distributed on the left and right sides are basically equal with the intake pipe as the central axis. Thus, by controlling the on and off of the two electromagnets simultaneously, the synchronous rising and falling of both sides can be achieved. If one of the electromagnets is damaged, the embedded flange copper bushing can still be lifted by the power provided by the other electromagnet to complete the intake process. Moreover, the overall volume is relatively small, and the production and installation are very convenient.

[0079] Specifically, the first electromagnet push rod B02 and the second electromagnet push rod B03 are arranged on both sides symmetrically with the dust intake pipe B06. A structure of the electromagnet push rod bracket B01 and the first electromagnet push rod B02 and the second electromagnet push rod B03 symmetrically installed in the electromagnet push rod bracket B01 is formed. There are 8 internal threaded holes on the electromagnet push rod for cooperating with the electromagnet push rod bracket B01.

[0080] The bottom end of the electromagnet push rod has a U-shaped groove with a through hole, and the U-shaped groove with the through hole is connected to the embedded flange copper sleeve bracket B04.

[0081] As Figure 12 shown, the oscillating balance includes a flange copper sleeve seat B09, a base, a tray B10 and an oscillating tube B11. Inside the inner cavity space of the flange copper sleeve seat B09, there are a base, a tray B10 and an oscillating tube B11. The oscillating tube B11 is vertically connected to the base, the lower end of the oscillating tube B11 is fixedly connected to the base, the upper end of the oscillating tube B11 is fixedly connected with a tray B10, and a filter membrane B08 for receiving dust is placed on the tray B10.

[0082] The dust inlet pipe B06 first fixes the round flange copper sleeve B07, the round flange copper sleeve B07 is connected to the electromagnet push rod bracket B01, and the body of the electromagnet push rod is also fixed. Thus, when the electromagnet push rod performs an extension or retraction movement, it can drive the embedded flange copper sleeve bracket B04 connected to the electromagnet push rod to move.

[0083] The embedded flange copper sleeve B05 on the embedded flange copper sleeve bracket B01 moves up and down on the dust inlet pipe B06.

[0084] In the specific implementation, the working process of the electromagnet push rod is as follows:

[0085] When the electromagnet push rod is energized, the push rod performs an upward retraction movement. The two electromagnet push rods are connected in parallel. After being connected in parallel, the movement of the two electromagnet push rods can be controlled simultaneously, so that the electromagnet push rods on both sides perform extension and retraction movements simultaneously.

[0086] The embedded flange copper sleeve B05 has the function of self-lubrication. When the electromagnet push rod performs an extension movement, at this time, the embedded flange copper sleeve B05 will move downward along the dust inlet pipe B06, so that the embedded flange copper sleeve B05 contacts the flange copper sleeve seat B09 of the oscillating balance. At this time, the oscillating balance and the dust inlet pipe B06 form a dust-containing gas path that communicates only with the atmosphere. In this way, the atmosphere falls onto the filter membrane B08 therein through the dust inlet pipe B06, and the filter membrane B08 on the oscillating balance is equivalent to being exposed to the atmosphere. Such a structural setting of the present invention can greatly reduce the settlement and accumulation of dust in the pipeline by reducing the length of the trachea in the gas path and the bending condition of the trachea.

[0087] In the specific implementation, the upper surface of the flange copper sleeve seat B09 of the oscillating balance is treated with a sealing gasket to improve the airtightness between the embedded flange copper sleeve B05 and the flange copper sleeve seat B09 of the oscillating balance.

[0088] The working mode of the electromagnet push rod is to automatically lift the push rod when powered on and to automatically perform free fall motion after power off. According to this working mode, in cooperation with the embedded flange copper sleeve B05 and the embedded flange copper sleeve bracket B04, the air intake state and membrane replacement state of the dust intake device are realized. The air intake state of the dust intake device is that the electromagnet push rod is powered off, and the embedded copper sleeve presses firmly against the flange copper sleeve seat B09 of the oscillating balance along the dust intake pipe B06 to carry out the dust intake process.

[0089] When the mass of the filter membrane B08 on the oscillating balance reaches saturation, at this time, dust no longer adheres to the filter membrane B08, that is, a new filter membrane B08 is replaced. At this time, the electromagnet push rod is powered on, and the push rod is lifted upward so that the embedded flange copper sleeve B05 is separated from the flange copper sleeve seat B09 of the oscillating balance and moves upward along the dust intake pipe B06.

[0090] After the membrane replacement action is completed, the electromagnet push rod continues to be powered off so that the embedded flange copper sleeve B05 presses firmly against the flange copper sleeve seat B09 of the oscillating balance, continues to carry out the dust intake step, and continues to complete the measurement of the concentration of ambient dust.

[0091] On the one hand, the above-mentioned first air intake device B can effectively reduce the problems of dust settlement and accumulation in the dust intake pipe during dust sampling. By exposing the filter membrane on the oscillating balance to the air, the filter membrane is fully in contact with the dust in the environment, which can more truly and effectively measure the concentration of dust in the environment, thereby improving the measurement accuracy.

[0092] On the other hand, the above-mentioned first air intake device B adopts a symmetrical electromagnet push rod design, which can smoothly lift the embedded flange copper sleeve along the dust intake pipe and will not cause eccentric wear between the embedded flange copper sleeve and the dust intake pipe due to unilateral lifting, thus damaging the dust intake pipe.

[0093] As Figure 13 shown, in a specific implementation, the second air intake device C as a whole includes a micro electric telescopic rod bracket C01, a micro electric telescopic rod C02, a first fixing bolt C03, a second fixing bolt C04, a compression spring C05, a copper sleeve bracket C06, a dust intake pipe C07, a round flange copper sleeve C08, an embedded flange copper sleeve C09, a tray C10, a flange copper sleeve seat C11, a filter membrane C12 and an oscillating tube C13.

[0094] The device body includes a micro electric telescopic rod bracket C01, a copper sleeve bracket C06, a dust inlet pipe C07, a round flange copper sleeve C08, an embedded flange copper sleeve C09, and an elastic lifting mechanism; the intake control electric device is located above the oscillating balance, the dust inlet pipe C07 is vertically arranged, the upper end of the dust inlet pipe C07 is fixedly sleeved in the round flange copper sleeve C08, the round flange copper sleeve C08 is fixed to the micro electric telescopic rod bracket C01, the lower end of the dust inlet pipe C07 is movably sleeved with the embedded flange copper sleeve C09, and the lifting of the embedded flange copper sleeve C09 is realized through the hard guidance of the dust inlet pipe C07, and at the same time, the intake control and membrane replacement are realized. The embedded flange copper sleeve C09 is fixed to the copper sleeve bracket C06, an oscillating balance is arranged below the embedded flange copper sleeve C09, and an elastic lifting mechanism is connected between the micro electric telescopic rod bracket C01 and the copper sleeve bracket C06, and the intake control of the oscillating balance is realized by elastically driving the lifting of the embedded flange copper sleeve C09 through the elastic lifting mechanism.

[0095] As Figure 13 and Figure 14 shown, the elastic lifting mechanism includes a spring housing, a micro electric telescopic rod C02 that can be extended or retracted, and a compression spring C05; the upper end of the micro electric telescopic rod C02 is hinged to the micro electric telescopic rod bracket C01 through a first fixing bolt C03, the spring housing is fixed to the copper sleeve bracket C06, the compression spring C05 is installed in the spring housing, a vertical strip-shaped through groove is provided on the side of the spring housing, the strip-shaped through groove is parallel to the dust inlet pipe C07, the lower end of the micro electric telescopic rod C02 is fixedly connected with a second fixing bolt C04, the second fixing bolt C04 is located in the spring housing and connected to the compression spring C05, and at the same time, one end of the second fixing bolt C04 penetrates and extends out of the strip-shaped through groove.

[0096] As Figure 14 and Figure 15 shown, the oscillating balance includes a flange copper sleeve seat C11, a base, a tray C10, and an oscillating tube C13. The inner cavity space of the flange copper sleeve seat C11 is provided with a base, a tray C10, and an oscillating tube C13. The oscillating tube C13 is vertically connected to the base, the lower end of the oscillating tube C13 is fixedly connected to the base, the upper end of the oscillating tube C13 is fixedly connected with a tray C10, and a filter membrane C12 for receiving dust is placed on the tray C10.

[0097] The micro electric telescopic rod C02 is internally provided with a DC motor. As long as the forward and reverse rotation of the DC motor is controlled, the extension and shortening of the micro electric telescopic rod C02 can be realized. In addition, the micro electric telescopic rod C02 has a self-locking function. As long as the power-on time of the micro electric telescopic rod C02 is controlled, the embedded flange copper sleeve can be driven to start and stop with the opening of the inlet pipe, and a limit switch is built in to effectively prevent the micro electric telescopic rod C02 from extending and shortening too much.

[0098] The compression spring C05 is installed inside the spring housing of the copper sleeve bracket C06. The copper sleeve bracket C06 is fixedly connected to the embedded flange copper sleeve C09, and the embedded flange copper sleeve C09 is sleeved with the dust inlet pipe C07.

[0099] At the upper end of the dust inlet pipe C07, there is a micro electric telescopic rod bracket C01. The micro electric telescopic rod bracket C01 is fixed to the round flange copper sleeve C08, so that the top of the micro electric telescopic rod C02 is fixed. Thus, when the micro electric telescopic rod C02 extends or retracts, it can drive the copper sleeve bracket C06 connected to the micro electric telescopic rod C02 to move up and down. Then, the up and down movement of the copper sleeve bracket C06 drives the embedded flange copper sleeve C09 on the copper sleeve bracket C06 to make a controllable up and down movement along the dust inlet pipe C07.

[0100] The structural features and process treatment of the embedded flange copper sleeve C09 are as follows:

[0101] As Figure 14 shown, when the micro electric telescopic rod C02 makes an extension movement, at this time, the embedded flange copper sleeve C09 will move downward along the dust inlet pipe C07, so that the embedded flange copper sleeve C09 contacts the flange copper sleeve seat C11 of the oscillating balance. At this time, the oscillating balance and the dust inlet pipe C07 form a dust-containing gas path that communicates only with the atmosphere. In this way, the atmosphere falls onto the filter membrane C12 therein through the dust inlet pipe C07, and the filter membrane C12 on the oscillating balance is equivalent to being exposed to the atmosphere. Such a structural setting of the present invention can greatly reduce the sedimentation and accumulation of dust in the pipeline by reducing the length of the air pipe in the gas path and the bending situation of the air pipe.

[0102] In specific implementation, the upper surface of the flange copper sleeve seat C11 of the oscillating balance is treated with a sealing gasket, which can improve the airtightness of the contact surface between the embedded flange copper sleeve C09 and the flange copper sleeve seat C11 of the oscillating balance.

[0103] After the embedded flange copper sleeve C09 contacts the flange copper sleeve seat C11 of the oscillating balance, the oscillating balance performs on-line detection of the ambient dust concentration, and there are also an air pipe, a flow meter and an air extraction pump connected to work at the bottom of the oscillating balance.

[0104] During the process of the extension of the micro electric telescopic rod C02, when the extended length of the micro electric telescopic rod C02 exceeds the originally designed downward movement stroke of the embedded flange copper sleeve C09, at this time, the micro electric telescopic rod C02 will immediately push against the compression spring C05, and the deformation of the compression spring C05 is used to offset the downward movement of the embedded flange copper sleeve C09, so as to protect the sensor of the oscillating balance from being damaged due to excessive top pressure of the embedded flange copper sleeve C09. Finally, the dust concentration value of the environment at this time is obtained through the dust mass measured by the oscillating balance and the cumulative value of the dust-containing gas flow measured by the flow meter.

[0105] Thus, through the buffering elastic movement of the elastic lifting mechanism of the present invention, it is possible to avoid the situation where when the intake pipe is not aligned with the oscillating balance, the electric telescopic rod extends to the end and damages the entire device. The shock-absorbing mechanism can elastically compress and offset the excessively extended part of the embedded flange copper sleeve to ensure the integrity of the device.

[0106] When the mass of the filter membrane C12 on the oscillating balance reaches saturation, the membrane-changing operation is performed. At this time, the micro electric telescopic rod C02 retracts, driving the embedded flange copper sleeve C09 to move upward along the dust intake pipe C07 and separate from the flange copper sleeve seat C11 of the oscillating balance, and then the operation of replacing the filter membrane C12 is carried out. After replacing the filter membrane C12, the extension and retraction actions of the micro electric telescopic rod C02 are repeated, and the dust intake sampling is performed again.

[0107] On the one hand, the above-mentioned second intake device C can effectively reduce the problems of dust settlement and accumulation in the dust intake pipe during dust sampling, fully expose the filter membrane on the oscillating balance to the air, more truly and effectively measure the dust concentration in the environment, and improve the measurement accuracy.

[0108] On the other hand, the above-mentioned second intake device C is a device with a buffer structure, which can well prevent the embedded flange copper sleeve on the dust intake pipe from damaging the sensor due to excessive top pressure on the oscillating balance caused by various uncertain factors.

[0109] As Figure 6 shown, the automatic membrane-changing process of the oscillating balance 9 under the system of the present invention is divided into several steps:

[0110] Step 1: Raise the intake device so that the flange copper sleeve 34 of the intake device is separated from the flange copper sleeve seat 35 of the oscillating balance 9 to disconnect the gas path, then reset the origin of the X, Y, and Z-axis walking mechanisms, wait to receive the membrane-changing instruction, and execute Step 2 after receiving the membrane-changing instruction;

[0111] Step 2: First, the X-axis walking mechanism works. The X-axis motor 2 rotates to drive the X-axis moving bottom plate 6 to move in the direction of the X-axis slide rail 31, so that the filter membrane 30 on the oscillating balance 9 installed on the X-axis moving bottom plate 6 is directly below the Z1-axis suction nozzle 22 of the first group of Z-axis slide rail components of the Y-axis walking mechanism;

[0112] Step 3: Start the Y-axis walking mechanism to work. The Y-axis motor 12 rotates to drive the Z1-axis suction nozzle 22 of the first group of Z-axis slide rail components on the Z-axis motor fixing plate 17 to move directly above the center of the filter membrane 30 on the oscillating balance 9, and then the filter membrane 30 on the oscillating balance 9 is recognized by the Z1-axis filter membrane recognition sensor 23;

[0113] Immediately afterwards, the Z-axis traveling mechanism operates. The Z-axis motor 18 rotates to drive the Z-axis swing arm 29 to rotate. Then, one end of the Z-axis swing arm 29 drives the Z1-axis suction nozzle 22 of the first group of Z-axis slide rail assemblies to move downward to contact the filter membrane 30 and suck up the filter membrane 30, and then rise. This filter membrane 30 serves as the used filter membrane 30 after sampling;

[0114] Next, the Y-axis traveling mechanism operates. The Y-axis motor 12 rotates to drive the Z1-axis suction nozzle 22 of the first group of Z-axis slide rail assemblies on the Z-axis motor fixing plate 17 to move to directly above the waste membrane collection box 10. Then, control the Z1-axis suction nozzle 22 of the first group of Z-axis slide rail assemblies to release and drop the used filter membrane 30 after sampling into the waste membrane collection box 10;

[0115] Step Four: The X-axis traveling mechanism and the Y-axis traveling mechanism operate. Move the X-axis moving bottom plate 6 and rotate the Y-axis motor 12 so that the Z2-axis suction nozzle 27 of the second group of Z-axis slide rail assemblies is aligned downward with a filter membrane 30 on the filter membrane box 11. The filter membranes 30 are placed in each grid. Scan each grid through the Z2-axis filter membrane identification sensor 28 until the filter membrane 30 is identified, and then suck up the filter membrane 30 as a new filter membrane;

[0116] Then, the X-axis traveling mechanism and the Y-axis traveling mechanism operate. Move the X-axis moving bottom plate 6 and rotate the Y-axis motor 2 so that the Z2-axis suction nozzle 22 of the second group of Z-axis slide rail assemblies moves to directly face the center of the flange copper sleeve seat 35 of the oscillating balance 9 downward. Then, the Z-axis traveling mechanism operates. The Z-axis motor 18 rotates to drive the Z-axis swing arm 29 to rotate. Then, one end of the Z-axis swing arm 29 drives the Z2-axis suction nozzle 27 of the second group of Z-axis slide rail assemblies to move downward and gently place the new filter membrane 30 on the tray 37 of the oscillating balance 9 and then release it;

[0117] After completion, reset again and return to the origin, and the entire set of actions for membrane replacement is completed;

[0118] Step Five: After waiting for the membrane replacement instruction to end, next, perform dust concentration sampling:

[0119] First, the X-axis motor 2 rotates to drive the X-axis moving bottom plate 6 to move in the X-axis direction, so that the flange copper sleeve seat 35 on the oscillating balance 9 installed on the X-axis moving bottom plate 6 moves to directly below the flange copper sleeve 34 on the air inlet device A / B;

[0120] Immediately afterwards, let the flange copper sleeve 34 descend along the air inlet pipe 33 to fit onto the flange copper sleeve seat 35 on the oscillating balance 9, and then perform sampling of the ambient dust concentration to achieve the functions of on-line monitoring and automatic membrane replacement.

[0121] The present invention discloses an automatic membrane replacement system for measuring dust concentration by an oscillating balance. Refer to Figure 1 the overall machine structure schematic diagram and Figure 9 is the oscillating balance structure schematic diagram.

[0122] In the oscillating balance for measuring dust of the present invention, the change in dust mass is converted into a change in natural frequency for measurement. When measuring the dust mass, the lower end of the oscillating tube 36 is fixed so that the upper end of the oscillating tube 36 can vibrate freely under the driving action of an external force, while the lower end remains stationary. A tray 37 for fixing the filter membrane and a filter membrane 30 for collecting dust are installed at the upper end of the oscillating tube 36. The oscillation frequency of the oscillating tube 36 is determined by the dust mass accumulated on the filter membrane 30. The greater the dust mass, the lower the oscillation frequency. As dust accumulates on the filter membrane 30, the oscillation frequency of the oscillating tube 36 will continuously decrease. By measuring the oscillation frequencies of the oscillating tube 36 before and after passing through the dust gas, the mass of the dust accumulated on the filter membrane 30 can be indirectly obtained. Then, based on the gas volume passing through the oscillating tube 36 obtained from the flowmeter, the mass concentration of the dust can be calculated.

Claims

1. An automatic membrane replacement method, characterized in that: The method adopts an automatic membrane replacement system of an oscillating microbalance dust concentration measuring instrument. The system includes the whole machine frame (1) of the automatic membrane replacement system and the walking mechanisms installed on the X, Y, and Z axes of the whole machine frame (1); the X-axis walking mechanism and the Y-axis walking mechanism are both installed on the whole machine frame (1), the Z-axis walking mechanism is installed on the Y-axis walking mechanism, and the oscillating microbalance (9), the old membrane collection box (10) and the filter membrane box (11) are arranged on the X-axis walking mechanism and driven by the X-axis walking mechanism to move horizontally; a first air inlet device (B) or a second air inlet device (C) for cooperating with the oscillating microbalance (9) is arranged above the oscillating microbalance (9). The method includes the following steps: Step 1: Raise the air inlet device so that the flange copper sleeve (34) of the air inlet device is separated from the flange copper sleeve seat (35) of the oscillating microbalance (9) to disconnect the air path, then reset the origin of the X, Y, and Z axis walking mechanisms, wait to receive the membrane replacement instruction, and execute Step 2 after receiving the membrane replacement instruction. Step 2: First, the X-axis walking mechanism works. The X-axis motor (2) rotates to drive the X-axis moving bottom plate (6) to move in the direction of the X-axis slide rail (31), so that the filter membrane (30) on the oscillating microbalance (9) installed on the X-axis moving bottom plate (6) is directly below the Z1-axis suction nozzle (22) of the first group of Z-axis slide rail components of the Y-axis walking mechanism. Step 3: Start the Y-axis walking mechanism to work. The Y-axis motor (12) rotates to drive the Z1-axis suction nozzle (22) of the first group of Z-axis slide rail components on the Z-axis motor fixing plate (17) to move to directly above the center of the filter membrane (30) on the oscillating microbalance (9), and then the filter membrane (30) on the oscillating microbalance (9) is identified by the Z1-axis filter membrane identification sensor (23); immediately afterwards, the Z-axis walking mechanism works. The Z-axis motor (18) rotates to drive the Z-axis swing arm (29) to rotate, and then one end of the Z-axis swing arm (29) drives the Z1-axis suction nozzle (22) of the first group of Z-axis slide rail components to move down to contact the filter membrane (30) and suck up the filter membrane (30) and then rise. This filter membrane (30) is used as the old filter membrane (30) after sampling. Continue to work the Y-axis walking mechanism. The Y-axis motor (12) rotates to drive the Z1-axis suction nozzle (22) of the first group of Z-axis slide rail components on the Z-axis motor fixing plate (17) to move to directly above the waste membrane collection box (10), and then control the Z1-axis suction nozzle (22) of the first group of Z-axis slide rail components to release and drop the sampled old filter membrane (30) into the waste membrane collection box (10). Step 4: The X-axis traveling mechanism and the Y-axis traveling mechanism operate. The X-axis moving base plate (6) moves, and the Y-axis motor (12) rotates, causing the Z2-axis nozzle (27) of the second group of Z-axis slide rail assemblies to align downward with a filter membrane (30) on the filter membrane cartridge (11). Each grid is scanned by the Z2-axis filter membrane identification sensor (28) until the filter membrane (30) is identified, and then the filter membrane (30) is sucked up as a new filter membrane. Then, the X-axis traveling mechanism and the Y-axis traveling mechanism operate. The X-axis moving base plate (6) moves, and the Y-axis motor (2) rotates, causing the Z2-axis nozzle (22) of the second group of Z-axis slide rail assemblies to move to the center of the flange copper sleeve seat (35) of the oscillating balance (9) facing downward. Then, the Z-axis traveling mechanism operates. The Z-axis motor (18) rotates to drive the Z-axis swing arm (29) to rotate. Further, one end of the Z-axis swing arm (29) drives the Z2-axis nozzle (27) of the second group of Z-axis slide rail assemblies to move downward and gently place the new filter membrane (30) on the tray (37) of the oscillating balance (9) and then release it; After completion, reset again and return to the origin, and the whole set of film-changing actions is completed; Step 5: After waiting for the film-changing instruction to end, next, perform dust concentration sampling: First, the X-axis motor (2) rotates to drive the X-axis moving base plate (6) to move in the X-axis direction, so that the flange copper sleeve seat (35) on the oscillating balance (9) installed on the X-axis moving base plate (6) moves to directly below the flange copper sleeve (34) on the air intake device (A / B). Immediately afterwards, let the flange copper sleeve (34) descend along the intake pipe (33) to fit onto the flange copper sleeve seat (35) on the oscillating balance (9), and then sample the ambient dust concentration to achieve the functions of online monitoring and automatic film changing.

2. The automatic film changing method according to claim 1, wherein: The X-axis traveling mechanism includes an X-axis motor (2), a motor seat (3) for fixing the X-axis motor (2), and a motor seat bracket (4) for installing the motor seat (3). The motor seat bracket (4) is fixedly installed on the overall machine frame (1) of the automatic die-changing device; the output shaft of the X-axis motor (2) is coaxially connected to a ball screw (8) through a coupling (5). X-axis slide rails (31) are provided on both sides of the ball screw (8). The two ends of the bottom of the X-axis moving base plate (6) are slidably installed on the X-axis slide rails (31) on both sides of the ball screw (8) through sliders. A lead screw nut is fixed in the middle of the bottom of the X-axis moving base plate (6), and the lead screw nut is threadedly sleeved on the ball screw (8); the oscillating balance (9), the used film collection box (10), and the filter membrane cartridge (11) are arranged on the X-axis moving base plate (6).

3. The automatic film changing method according to claim 1, characterized in that: The Y-axis traveling mechanism includes a Y-axis motor (12), a Y-axis motor bracket (32) for fixing the Y-axis motor (12), a driving pulley (13), and a driven pulley (14); the Y-axis motor bracket (32) is installed on the overall machine frame (1). The driving pulley (13) at one end is installed on the output shaft of the Y-axis motor (12). The driven pulley (14) at the other end is hingedly installed on the overall machine frame (1) through a pulley bracket (15). The driving pulley (13) and the driven pulley (14) are connected by belt drive, and the Z-axis traveling mechanism (A) is installed on the belt.

4. The automatic film changing method according to claim 1, characterized in that: The described Z-axis traveling mechanism (A) includes a Z-axis motor fixing plate (17), a Z-axis motor (18) installed on the Z-axis motor fixing plate (17), a Z-axis swing arm (29), and two groups of Z-axis slide rail assemblies installed on the Z-axis motor fixing plate (17); the Z-axis motor fixing plate (17) is installed on the belt of the Y-axis traveling mechanism, the output shaft of the Z-axis motor (18) is horizontally arranged, the output shaft of the Z-axis motor (18) is coaxially fixed to the middle of the Z-axis swing arm (29), the Z-axis swing arm (29) is located above the two groups of Z-axis slide rail assemblies, and the two ends of the Z-axis swing arm (29) are used to respectively push the movement of the two groups of Z-axis slide rail assemblies.

5. The automatic film changing method according to claim 4, characterized in that: Each group of the Z-axis slide rail assemblies includes a Z-axis slide rail (19 / 24), a Z-slider (20 / 25) slidably installed on the Z-axis slide rail (19 / 24), a Z-suction nozzle joint (21 / 26) installed on the Z-slider (20 / 25), a Z-axis suction nozzle (22 / 27), and a Z-axis filter membrane identification sensor (23 / 28). The Z-axis slide rail (19 / 24) is vertically arranged and fixed on the side of the Z-axis motor fixing plate (17). The Z-suction nozzle (22 / 27) is installed at the lower end of the Z-suction nozzle joint (21 / 26), and the Z-axis filter membrane identification sensor (23 / 28) is installed on the side of the Z-axis suction nozzle (22 / 27). The Z-axis filter membrane identification sensor (23 / 28) is used to detect downward whether there is a filter membrane (30) directly below the Z-axis suction nozzle (22 / 27); the Z-axis slide rails (19 / 24) of the two groups of Z-axis slide rail assemblies are arranged in parallel at intervals; the two ends of the Z-axis swing arm (29) are respectively connected to the Z-sliders (20 / 25) of the two groups of Z-axis slide rail assemblies, and the operation of the Z-axis motor (18) drives the Z-axis swing arm (29) to rotate to drive the Z-axis suction nozzles (22 / 27) of the two groups of Z-axis slide rail assemblies to move alternately along their respective Z-axis slide rails (19 / 24).

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