阅读说明：本技术 一种便携式放射性气溶胶自动采样分析装置及检测方法 (Portable radioactive aerosol automatic sampling analysis device and detection method ) 是由 潘志东 毛传林 黄桂榕 程正杭 张俊杰 柳世波 吴程 于 2020-05-25 设计创作，主要内容包括：本发明公开了一种便携式放射性气溶胶自动采样分析装置,包括：外壳,内置有滤膜组件；上盖,与外壳形成活动空腔,其通过限位组件连接有检测板；升降机构,可于活动空腔内移动；旋转机构,用于翻转连接表面污染仪,可随升降机构同步移动靠近检测板或滤膜组件；于升降机构带动表面污染仪靠近检测板时,旋转机构带动表面污染仪翻转,使其探测面朝向检测板,并可将检测板脱离上盖连接于旋转机构；于升降机构带动表面污染仪靠近滤膜组件时,旋转机构带动表面污染仪翻转,使其探测面朝向滤膜组件。本发明还公开了一种便携式放射性气溶胶自动采样分析装置的检测方法。本发明检测分析过程自动化,人工干涉少,检测效率高,检测效果好；体积小,便于携带。(The invention discloses a portable radioactive aerosol automatic sampling and analyzing device, which comprises: a housing having a filter membrane assembly disposed therein; the upper cover and the shell form a movable cavity, and the upper cover is connected with a detection plate through a limiting assembly; the lifting mechanism can move in the movable cavity; the rotating mechanism is used for overturning and connecting the surface pollution instrument and can synchronously move close to the detection plate or the filter membrane component along with the lifting mechanism; when the lifting mechanism drives the surface pollution instrument to be close to the detection plate, the rotating mechanism drives the surface pollution instrument to turn over so that the detection surface of the surface pollution instrument faces the detection plate, and the detection plate can be separated from the upper cover and connected to the rotating mechanism; when the lifting mechanism drives the surface pollution instrument to be close to the filter membrane component, the rotating mechanism drives the surface pollution instrument to turn over, so that the detection surface of the surface pollution instrument faces the filter membrane component. The invention also discloses a detection method of the portable radioactive aerosol automatic sampling analysis device. The detection and analysis process is automatic, the manual interference is less, the detection efficiency is high, and the detection effect is good; small size and convenient carrying.)

1. A portable radioactive aerosol automatic sampling analysis device is characterized by comprising:

a housing (1) in which a filter membrane module (2) is disposed;

the upper cover (3) is connected with the shell (1), forms a movable cavity (4) with the shell (1), and is connected with a detection plate (31) through a limiting component (5);

the lifting mechanism (6) can move in the movable cavity (4);

the rotating mechanism (7) is connected with the lifting mechanism (6), is used for overturning and connecting the surface pollution instrument (8), and can synchronously move close to the detection plate (31) or the filter membrane component (2) along with the lifting mechanism (6);

when the lifting mechanism (6) drives the surface pollution instrument (8) to approach the detection plate (31), the rotating mechanism (7) drives the surface pollution instrument (8) to turn over, so that the detection surface (81) faces the detection plate (31), and the detection plate (31) can be separated from the upper cover (3) and connected to the rotating mechanism (7);

when the lifting mechanism (6) drives the surface pollution instrument (8) to be close to the filter membrane component (2), the rotating mechanism (7) drives the surface pollution instrument (8) to turn over, so that the detection surface (81) faces the filter membrane component (2).

2. The portable radioactive aerosol automatic sampling analysis device according to claim 1, wherein: the movable cavity (4) extends along the height direction of the shell (1), the detection plate (31) is connected to the top of the upper cover (3), and the filter membrane component (2) and the detection plate (31) are arranged up and down correspondingly.

3. The portable radioactive aerosol automatic sampling analysis device according to claim 1, wherein: the filter membrane component (2) comprises a filter membrane (21), a membrane pressing block (22) arranged above the filter membrane (21), a membrane pressing block motor (23) used for driving the membrane pressing block (22) to rotate, a roller (24) used for tensioning the filter membrane (21), and a roller bearing seat (25).

4. The portable radioactive aerosol automatic sampling analysis device according to claim 1, wherein: the lifting mechanism (6) comprises a support (61) arranged on the shell (1), a lifting rod (62) capable of moving up and down along the axial direction of the support (61), a top plate (63) connected to the top of the lifting rod (62), and a rotating shaft (64) arranged on the top plate (63) and capable of driving the rotating mechanism (7) to overturn.

5. The portable radioactive aerosol automatic sampling analysis device according to claim 4, wherein: the lifting mechanism (6) further comprises a lifting position detection plate (65) for detecting the lifting height of the lifting mechanism, and a lifting photoelectric sensor (66) matched with the lifting position detection plate.

6. The portable radioactive aerosol automatic sampling analysis device according to claim 4, wherein: the support (61) comprises a left support (611) and a right support (612), the rotating shaft (64) is arranged on the left support (611), the rotating shaft (67) matched with the rotating shaft (64) is arranged on the right support (612), and the rotating mechanism (7) is connected between the rotating shaft (64) and the rotating shaft (67).

7. The portable radioactive aerosol automatic sampling analysis device according to claim 1, wherein: the rotating mechanism (7) comprises a rotating frame (71), a hoop (72) arranged on the rotating frame (71), a window (73) for extending out of a detection surface (81) of the surface pollution meter (8), and a connecting component (77) for connecting a detection plate (31).

8. The portable radioactive aerosol automatic sampling analysis device according to claim 7, wherein: the rotating mechanism (7) further comprises a rotating position detection plate (74) used for monitoring the overturning angle of the rotating mechanism, and a rotating photoelectric sensor (75) matched with the rotating position detection plate.

9. The portable radioactive aerosol automatic sampling analysis device according to claim 1, wherein: the limiting assembly (5) comprises a fixing seat (51) arranged on the upper cover (3), a plurality of telescopic electromagnetic locks (52) arranged on the fixing seat (51), a lock sleeve (53) matched with the telescopic electromagnetic locks (52), and a lock hole (311) arranged on the detection plate (31).

10. A detection method of a portable radioactive aerosol automatic sampling analysis device is characterized by comprising the following steps:

1) the lifting mechanism drives the surface pollution instrument to move in the movable cavity;

2) the rotating mechanism drives the surface pollution meter to overturn until the detection surface of the surface pollution meter faces the detection plate;

3) the lifting mechanism continues to drive the surface pollution meter to move until the surface pollution meter is close to the detection plate, the limiting assembly loosens the detection plate, and the lifting mechanism drives the surface pollution meter to move reversely after the rotating mechanism is connected with the detection plate;

4) the rotating mechanism drives the surface pollution instrument to overturn to the detection surface and the detection plate towards the filter membrane assembly;

5) the lifting mechanism continues to drive the surface pollution instrument to move until the distance between the surface pollution instrument and the filter membrane component is h1, the surface pollution instrument reads data, and a gamma radioactive background value is obtained through measurement;

6) the lifting mechanism drives the surface pollution instrument to reversely move again, and the rotating mechanism drives the surface pollution instrument to overturn until the detection surface of the surface pollution instrument faces the upper cover;

7) the lifting mechanism continues to drive the surface pollution instrument to move until the surface pollution instrument is close to the top of the upper cover, the limit component locks the detection plate, and the lifting mechanism drives the surface pollution instrument to move in the reverse direction after the rotating mechanism is disconnected from the detection plate;

8) the rotating mechanism drives the surface pollution meter to overturn until the detection surface of the surface pollution meter faces the filter membrane component;

9) the lifting mechanism continues to drive the surface pollution instrument to move until the distance between the surface pollution instrument and the filter membrane component is h1, the surface pollution instrument reads data, and a beta + gamma radioactive background value is obtained through measurement;

10) the lifting mechanism continues to drive the surface pollution instrument to move downwards until the distance between the surface pollution instrument and the filter membrane component is h2, the surface pollution instrument reads data, and an alpha radioactive background value is obtained through measurement;

11) the lifting mechanism drives the surface pollution instrument to move upwards, and the rotating mechanism drives the surface pollution instrument to overturn until the detection surface of the surface pollution instrument faces the detection plate;

12) starting sampling, and repeating the actions 1) to 11) after the sampling is finished, thereby finishing the detection.

Technical Field

The invention belongs to the technical field of radiation environment monitoring equipment, and particularly relates to a portable radioactive aerosol automatic sampling analysis device and a detection method.

Background

The air quality is increasingly deteriorated, the human health and the quality of the living environment are directly affected, the air pollution problem is frequent, for example, nuclear radiation events are increased, toxic gas pollution is frequent, the air quality needs to be continuously detected in the air treatment process, and therefore, an advanced air quality detection device needs to be developed, wherein one of the advanced air quality detection device is a radioactive aerosol automatic sampling analysis device.

Most of the traditional radioactive aerosol devices mainly use sampling devices, and the existing radioactive aerosol devices have analysis functions, are large-sized instruments, are large in size and cannot achieve portable functions. In addition, for the detection equipment of the radiation environment, the components of the filter paper are mainly detected, so as to analyze and judge whether the radiation environment meets the corresponding regulations, but the existing detection mode has low automation degree, and needs more artificial actions, such as manual cutting of the filter paper in advance, manual replacement of a filter paper box and the like, so that the measurement accuracy is low. Therefore, there is a need to provide a portable automatic sampling and analyzing device for radioactive aerosol, which can automatically sample and automatically replace filter paper, save time and labor, and realize automatic analysis.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides the portable radioactive aerosol automatic sampling analysis device and the detection method thereof, which have the advantages of high automation degree, good reliability, high accuracy, high detection efficiency and small volume.

The technical scheme adopted by the invention for solving the technical problems is as follows: a portable radioactive aerosol automatic sampling analysis device, comprising:

a housing having a filter membrane assembly disposed therein;

the upper cover is connected with the shell, forms a movable cavity with the shell and is connected with a detection plate through a limiting assembly;

the lifting mechanism can move in the movable cavity;

the rotating mechanism is connected with the lifting mechanism, is used for overturning and connecting the surface pollution meter and can synchronously move close to the detection plate or the filter membrane component along with the lifting mechanism;

when the lifting mechanism drives the surface pollution instrument to be close to the detection plate, the rotating mechanism drives the surface pollution instrument to turn over so that the detection surface of the surface pollution instrument faces the detection plate, and the detection plate can be separated from the upper cover and connected to the rotating mechanism;

when the lifting mechanism drives the surface pollution instrument to be close to the filter membrane component, the rotating mechanism drives the surface pollution instrument to turn over, so that the detection surface faces the filter membrane component.

Furthermore, the movable cavity extends along the height direction of the shell, the detection plate is connected to the top of the upper cover, and the filter membrane assembly and the detection plate are arranged in an up-and-down corresponding mode.

Further, the filter membrane subassembly includes filtration membrane, locates the pressure membrane piece of filtration membrane top for the rotatory pressure membrane piece motor of drive pressure membrane piece, the cylinder that is used for tensioning filtration membrane, and the cylinder bearing frame.

Furthermore, elevating system is including arranging the support of shell in, can follow the lifter that the support axial reciprocated, connect in the roof at lifter top, and locate the roof, can drive the axis of rotation of rotary mechanism upset.

Furthermore, the lifting mechanism further comprises a lifting position detection plate for detecting the lifting height of the lifting mechanism, and a lifting photoelectric sensor matched with the lifting position detection plate.

Further, the support includes left socle and right branch frame, set up on the left socle the axis of rotation, be equipped with on the right branch frame with axis of rotation complex pivot, rotary mechanism connects between axis of rotation and pivot.

Furthermore, rotary mechanism includes the revolving frame, locates the staple bolt of revolving frame, supplies the window that the detection face of surface pollution appearance stretches out, and is used for connecting the coupling assembling of pick-up plate.

Furthermore, the rotating mechanism further comprises a rotating position detection plate for monitoring the turning angle of the rotating mechanism, and a rotating photoelectric sensor matched with the rotating position detection plate.

Furthermore, spacing subassembly is including the fixing base of locating the upper cover, locates a plurality of flexible electromagnetic locks of fixing base, with flexible electromagnetic lock complex lock cover, and locate the lockhole of pick-up plate.

The invention also discloses a detection method of the portable radioactive aerosol automatic sampling analysis device, which comprises the following steps:

1) the lifting mechanism drives the surface pollution instrument to move in the movable cavity;

2) the rotating mechanism drives the surface pollution meter to overturn until the detection surface of the surface pollution meter faces the detection plate;

3) the lifting mechanism continues to drive the surface pollution meter to move until the surface pollution meter is close to the detection plate, the limiting assembly loosens the detection plate, and the lifting mechanism drives the surface pollution meter to move reversely after the rotating mechanism is connected with the detection plate;

4) the rotating mechanism drives the surface pollution instrument to overturn to the detection surface and the detection plate towards the filter membrane assembly;

5) the lifting mechanism continues to drive the surface pollution instrument to move until the distance between the surface pollution instrument and the filter membrane component is h1, the surface pollution instrument reads data, and a gamma radioactive background value is obtained through measurement;

6) the lifting mechanism drives the surface pollution instrument to reversely move again, and the rotating mechanism drives the surface pollution instrument to overturn until the detection surface of the surface pollution instrument faces the upper cover;

7) the lifting mechanism continues to drive the surface pollution instrument to move until the surface pollution instrument is close to the top of the upper cover, the limit component locks the detection plate, and the lifting mechanism drives the surface pollution instrument to move in the reverse direction after the rotating mechanism is disconnected from the detection plate;

8) the rotating mechanism drives the surface pollution meter to overturn until the detection surface of the surface pollution meter faces the filter membrane component;

9) the lifting mechanism continues to drive the surface pollution instrument to move until the distance between the surface pollution instrument and the filter membrane component is h1, the surface pollution instrument reads data, and a beta + gamma radioactive background value is obtained through measurement;

10) the lifting mechanism continues to drive the surface pollution instrument to move downwards until the distance between the surface pollution instrument and the filter membrane component is h2, the surface pollution instrument reads data, and an alpha radioactive background value is obtained through measurement;

11) the lifting mechanism drives the surface pollution instrument to move upwards, and the rotating mechanism drives the surface pollution instrument to overturn until the detection surface of the surface pollution instrument faces the detection plate;

12) starting sampling, and repeating the actions 1) to 11) after the sampling is finished, thereby finishing the detection.

The invention has the advantages that 1) the whole detection and analysis process is automated, the manual interference is less, the labor cost is saved, the detection efficiency is higher, and the detection effect is better; 2) the volume is small, the carrying is convenient, and the field sampling analysis is convenient; 3) the lifting mechanism and the rotating mechanism are designed, so that the layout is reasonable, and the volume of the whole device is reduced; 4) the automatic film changing mechanism is arranged, so that the field long-time automatic sampling analysis and measurement can be realized, and the labor cost is reduced.

Drawings

Fig. 1 is a perspective view of the present invention.

Fig. 2 is an internal perspective view of the state where the upper cover is opened according to the present invention.

FIG. 3 is a schematic diagram of a structure of the present invention in which the lifting mechanism and the rotating mechanism are engaged, wherein the detection surface of the surface contamination meter faces downward.

FIG. 4 is a schematic diagram of a second structure of the lifting mechanism and the rotating mechanism of the present invention, wherein the detection surface of the surface contamination meter faces upward.

FIG. 5 is a schematic view of a filter membrane module according to the present invention.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1-5, a portable radioactive aerosol automatic sampling and analyzing device comprises a housing 1 with an opening at the upper part, a filter membrane component 2 arranged in the housing 1, an upper cover 3 connected to the opening at the upper part of the housing 1 in an overturning way, a lifting mechanism 6, a rotating mechanism 7 connected to the lifting mechanism 6 and capable of moving up and down synchronously with the lifting mechanism 6, and a surface pollution meter 8 connected to the rotating mechanism 7 in an overturning way.

As shown in FIG. 2, the housing 1 is hollow, a blower 11 for sampling is disposed, and an air outlet of the blower 11 is disposed near the filter membrane module 2. The upper part of the shell 2 is provided with a supporting base 27, and the supporting base 27 is connected with the filter membrane component 2; as shown in fig. 5, the filter membrane module 2 includes a filter membrane 21 extending in a width direction of the housing 1, a filter membrane pressing plate 26 attached to the filter membrane 21, a lamination block 22 located above the filter membrane pressing plate 26, a lamination block motor 23 connected to the lamination block 22 for driving the lamination block 22, a roller 24 for tensioning the filter membrane 21, and roller bearing blocks 25 connected to both ends of the roller 24.

The filter membrane pressing plate 26 comprises an upper pressing plate 261 arranged above the filter membrane 21 and a lower supporting plate 262 arranged below the filter membrane 21, and both the upper pressing plate 261 and the lower supporting plate 262 are of hollow frame-shaped structures; the pressing block 22 is of a cam structure, so that the pressing block 22 can rotate to press the upper pressing plate 261 downwards to be close to the lower supporting plate 262, and can also rotate to loosen the upper pressing plate 261 to realize replacement of the filtering membrane 21.

In order not to damage the filtering membrane 21 and at the same time to achieve structural stability, an elastic sealing member 263 is fixedly coupled to a lower surface of the upper pressure plate 261.

In order to adjust the relative movement distance of the upper pressure plate 261, an adjusting nut 28 is arranged around the upper pressure plate 261, the adjusting nut 28 passes through the upper pressure plate 261 and then is connected with the lower support plate 262, an elastic member 29 is further sleeved on the portion, located between the upper pressure plate 261 and the lower support plate 262, of the adjusting nut 28, the elastic member 29 is in a compressed state, and the distance between the upper pressure plate 261 and the lower pressure plate 261 is achieved by adjusting the connection length of the adjusting nut 28 and the lower pressure plate 261.

The number of the rollers 24 is two, and the rollers comprise a first roller 241 for expanding the filtering membrane 21 and a second roller 242 for winding the filtering membrane 21, the first roller 241 and the second roller 242 are oppositely arranged, and the filtering membrane 21 is in a tension state between the first roller 241 and the second roller 242; a first roller bearing housing 251 and a first roller motor 201 are provided at both ends of the first roller 241, and a second roller bearing housing 252 and a second roller motor 202 are also provided at both ends of the second roller 242.

Before sampling analysis is performed, the first roller motor 201 and the second roller motor 202 are started to drive the first roller 241 and the second roller 242 to rotate, so that feeding of the filtering membrane 21 is realized; after sampling and analysis are completed according to a given flow, the first roller motor 201 and the second roller motor 202 rotate again to drive the first roller 241 and the second roller 242 to rotate, so as to realize replacement and storage of the filtering membrane 21.

The side wall of the upper cover 3 and the shell 1 are enclosed to form a movable cavity 4, namely the movable cavity 4 extends along the height direction of the shell 1; the inner top surface of the upper cover 3 is detachably connected with a detection plate 31 through a limiting component 5, the position of the detection plate 31 and the position of the filter membrane component 2 are arranged up and down correspondingly, in the embodiment, the detection plate 31 is a flat plate made of aluminum material; the limiting component 5 comprises a fixed seat 51 arranged on the top surface of the upper cover 3, a plurality of telescopic electromagnetic locks 52 connected to the fixed seat 51, a lock sleeve 53 matched with the telescopic electromagnetic locks 52, and a lock hole 311 arranged on the detection plate 31. Specifically, the two opposite sides of the detection plate 31 are bent to form flanges 312, the flanges 312 are provided with locking holes 311, and in an initial state, the lock sleeve 53 extends into the locking holes 311, so that the detection plate 31 is fixedly limited at the top of the upper cover 3 by the telescopic electromagnetic lock 52; when the detection plate 31 needs to be separated from the upper cover 3, the lock sleeve 53 is separated from the lock hole 311 by the driving of the telescopic electromagnetic lock 52.

As shown in fig. 3, the lifting mechanism 6 can move up or down in the movable cavity 4, and includes a bracket 61 disposed in the housing 1, a lifting rod 62 sleeved on the bracket 61 and capable of moving up or down along the axial direction of the bracket 61, a top plate 63 fixedly connected to the top of the lifting rod 62, and a rotating shaft 64 disposed on the top plate 63 and capable of driving the rotating mechanism 7 to turn.

In order to increase the structural stability, the bracket 61 includes a left bracket 611 and a right bracket 612 which are symmetrically arranged, a left lifting rod 621 is sleeved in the left bracket 611, the top of the left lifting rod 621 is fixedly connected with a left top plate 631, and the left top plate 631 is connected with the rotating shaft 64 through a bearing and a bearing fixing seat 681; the right bracket 612 is internally sleeved with a right lifting rod 622, the top of the right lifting rod 622 is fixedly connected with a right top plate 632, the right top plate 632 is connected with a rotating motor 683 through a coupler 682 and drives a rotating shaft 67 to rotate circumferentially, and the rotating mechanism 7 is connected between the rotating shaft 64 and the rotating shaft 67, so that the rotating shaft 67 and the rotating shaft 64 are matched to drive the rotating mechanism 7 to turn.

In order to accurately monitor the lifting height of the lifting mechanism 6, a lifting photoelectric sensor 66 is provided on the supporting base 27, and a lifting position detecting plate 65 having at least four limit points 651 capable of cooperating with the lifting photoelectric sensor 66 is vertically connected to the right top plate 632.

The rotating mechanism 7 comprises a rotating frame 71 connected between the rotating shaft 67 and the rotating shaft 64, a hoop fixing seat 76 arranged on the rotating frame 71, a hoop 72 connected to the hoop fixing seat 76 and used for connecting the surface pollution meter 8, and a window 73 arranged on the rotating frame 71 and used for extending out of a detection surface 81 of the surface pollution meter 8.

With the cooperation of the rotating shaft 67 and the rotating shaft 64, the entire rotating mechanism 7 can be turned around the axes of the rotating shaft 67 and the rotating shaft 64 by a certain angle, so that the detecting surface 81 faces upward or downward. In order to accurately monitor the turning angle of the rotating mechanism 7, a rotary photoelectric sensor 75 is provided at a position close to the bearing fixing base 681, a rotary position detection plate 74 is formed at the end of the rotary shaft 64, and four fan-shaped fins are formed at intervals on the rotary position detection plate 74, so that two adjacent fan-shaped fins pass through the rotary position detection plate 74 respectively, indicating that the rotating mechanism 7 is turned by 90 °.

In order to connect the detection plate 31 with the rotating mechanism 7 after being separated from the upper cover 3, a connection assembly 77 is disposed on the rotating mechanism 7, and includes a plurality of second telescopic electromagnetic locks 771 disposed along the circumferential direction of the rotating frame 71 and a second lock sleeve 772 engaged therewith, and the structure thereof is the same as that of the telescopic electromagnetic lock 52 and will not be described again.

A detection method of a portable radioactive aerosol automatic sampling analysis device comprises the following steps:

1) before sampling is started, the roller 24 conveys a new filtering membrane 21 to the position of a sampling opening, and the film pressing block 22 presses the filtering membrane 21 tightly, so that the filtering membrane 21 is fixed at the sampling opening;

2) the detection face 81 of the surface contamination meter 8 is directed toward the filter membrane module 2, i.e., is disposed downward; the lifting mechanism 6 drives the surface pollution meter 8 to move upwards in the movable cavity 4 until a middle limit point 651 triggers the lifting photoelectric sensor 66;

3) the rotating mechanism 7 drives the surface pollution meter 8 to turn over until the detection surface 81 faces the detection plate 31, namely, the surface pollution meter is turned over by 180 degrees so as to be arranged upwards;

4) the lifting mechanism 6 continues to drive the surface pollution meter 8 to move upwards in the movable cavity 4 until the lowest limiting point 651 triggers the lifting photoelectric sensor 66, and at the moment, the detection surface 81 is close to the detection plate 31;

5) the telescopic electromagnetic lock 52 of the limiting assembly 5 loosens the limit of the detection plate 31, and meanwhile, the second telescopic electromagnetic lock 771 of the connecting assembly 77 on the rotating mechanism 7 is electrified to fix the detection plate 31 on the rotating mechanism 7;

6) the lifting mechanism 6 drives the surface pollution meter 8 to move downwards in the opposite direction until the lifting photoelectric sensor 66 is triggered by the limit point 651 in the middle of the movement;

7) the rotating mechanism 7 drives the surface pollution meter 8 to turn over until the detection surface 81 faces the filter membrane component 2, namely, the surface pollution meter is turned over by 180 degrees and is arranged downwards, and the detection plate 31 also faces downwards;

8) the lifting mechanism 6 continues to drive the surface contamination meter 8 and the detection plate 31 to move downwards until the detection plate moves to one of the uppermost limiting points 651 to trigger the lifting photoelectric sensor 66, at this time, the interval between the detection plate 31 and the filter membrane 21 is h1, and in the embodiment, h1 is 10 mm;

the lifting mechanism 6 stops moving downwards, the surface contamination meter 8 starts to read data, and the measured value is the gamma radioactivity background value of the newly placed filter membrane 21;

9) the lifting mechanism 6 drives the surface pollution instrument 8 and the detection plate 31 to move upwards until a middle limit point 651 triggers the lifting photoelectric sensor 66; the rotating mechanism 7 drives the surface pollution meter 8 and the detection plate 31 to turn over until the detection surface 81 and the detection plate 31 face the upper cover 3, namely, the detection plate 31 is turned over by 180 degrees and arranged upwards, and the detection plate 31 also faces upwards;

10) the lifting mechanism 6 continues to drive the surface pollution meter 8 and the detection plate 31 to move upwards until the detection plate 31 is close to the top of the upper cover 3, the telescopic electromagnetic lock 52 of the limiting assembly 5 is electrified to lock the detection plate 31, and meanwhile, the second telescopic electromagnetic lock 771 of the connecting assembly 77 releases the locking of the detection plate 31, so that the rotating mechanism 7 and the detection plate 31 are disconnected;

11) the lifting mechanism 6 drives the surface pollution instrument 8 to move downwards until a middle limit point 651 triggers the lifting photoelectric sensor 66, and the rotating mechanism 7 drives the surface pollution instrument 8 to turn over until a detection surface 81 of the surface pollution instrument faces the filter membrane component 2, namely turn over 180 degrees so that the surface pollution instrument is arranged downwards;

12) the lifting mechanism 6 continues to drive the surface contamination meter 8 to move downwards until the uppermost limiting point 651 triggers the lifting photoelectric sensor 66, at this time, the interval between the filtering membranes 21 of the detection surface 81 is h1, and in this embodiment, h1 is 10 mm;

the lifting mechanism 6 stops moving downwards, the surface contamination meter 8 starts to read data, and the measured value is the beta + gamma radioactive background value of the newly placed filter membrane 21, so that the beta value can be obtained through calculation;

13) the lifting mechanism 6 continues to drive the surface contamination meter 8 to move downwards until another limit point 651 at the top triggers the lifting photoelectric sensor 66, at this time, the interval between the filtering membranes 21 of the detection surface 81 is h2, and in this embodiment, h2 is 5 mm;

the lifting mechanism 6 stops moving downwards, the surface pollution meter 8 starts to read data, and the obtained numerical value is an alpha background value;

14) the lifting mechanism 6 drives the surface pollution meter 8 to move upwards until a middle limit point 651 triggers the lifting photoelectric sensor 66, and the rotating mechanism 7 drives the surface pollution meter 8 to turn over until a detection surface 81 of the surface pollution meter faces the detection plate 31, namely, turn over 180 degrees so that the surface pollution meter is arranged upwards;

15) starting sampling, wherein the sampling time can be set as required, and after the sampling is finished, repeating the actions 1) -14), measuring the values of alpha and beta, uploading the values to a control platform, and issuing a corresponding report;

16) after the detection is finished, the filtering membrane 21 is automatically replaced, the upper pressing plate 261 is loosened by the film pressing block 22, the first roller 241 and the second roller 242 simultaneously drive the filtering membrane 21 to advance, and whether the filtering membrane 21 is replaced or not is calculated according to the rotating speed and the rotating time of the first roller 241 and the second roller 242.

The foregoing detailed description is intended to illustrate and not limit the invention, which is intended to be within the spirit and scope of the appended claims, and any changes and modifications that fall within the true spirit and scope of the invention are intended to be covered by the following claims.