Atmospheric particulate sampling left-right moving paper device and control method thereof

Abstract

The application discloses a kind of atmospheric particulate matter sampling left and right paper moving device and control method thereof, including sliding plate assembly, sampling body assembly, screw rod assembly, left limit block and right limit block, sliding plate assembly is composed of driving wheel, driven wheel and paper tape shaft, sampling body assembly is composed of sampling pressure head, photoelectric tube, beta source and motor, screw rod assembly is composed of screw rod, screw rod motor, push block and spring guide rail.This application uses straight tube sampling in left and right paper moving for particulate matter sampling, which can effectively reduce the influence of dust accumulation in the tube, and move the detection unit out of the gas path, heating the sample gas to remove moisture, which has no effect on the photoelectricity, and can greatly improve the accuracy of detection. The precise positioning during the paper moving process ensures that the sampling spot is accurately delivered to the detection unit position. In the paper moving process, the spring is compressed to eliminate over-positioning, ensuring that the sliding plate assembly contacts the left and right limit plates for precise positioning.

Description

Technical Field

[0001] This invention relates to the field of air monitoring, and in particular to a left-right paper-shifting device for sampling atmospheric particulate matter and its control method. Background Technology

[0002] Currently, many manufacturers use a bent tube structure as shown in the diagram below in atmospheric particulate matter sampling instruments. The sample gas needs to pass through a curved section before reaching the sampling spot detection location. The advantage of this structure is that detection can be performed immediately after sampling, avoiding measurement errors caused by paper tape deviation. However, its disadvantages remain significant: ① Dust easily accumulates after the sample gas enters the bent tube; ② Because the sample gas needs to be heated and dehumidified, the temperature of the sample gas after external dynamic heating is generally above 35℃. Simultaneously, to prevent condensation after passing through the sampling body, the sampling body also needs to be heated to around 35℃. At this temperature, the noise of the phototube detector is relatively high.

[0003] If the detection part of the phototube detector can be separated from the sampling spot to eliminate the influence of sample gas heating on the phototube detector, and the sampling part can be designed from a bent tube structure to a straight tube structure, dust accumulation in the bent tube can be reduced. The new left-right paper-shifting structure completely solves the two major drawbacks of the bent tube structure, but the accuracy of left-right paper shifting still needs to be addressed. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide an atmospheric particulate matter sampling device for left and right paper shifting and its control method.

[0005] To solve the above-mentioned technical problems, the present invention provides the following first technical solution:

[0006] This invention relates to an atmospheric particulate matter sampling device with left and right paper shifting and its control method, comprising a sliding plate assembly, a sampling body assembly, a lead screw assembly, a left limit block, and a right limit block. The sliding plate assembly consists of a driving wheel, a driven wheel, and a paper tape shaft. The sampling body assembly consists of a sampling pressure head, a phototube, a β source, and a motor. The lead screw assembly consists of a lead screw, a lead screw motor, a push block, and a spring guide rail. The left and right limit blocks are located on the left and right sides of the sliding plate assembly, respectively. The device detects when the sliding plate assembly reaches the left limit block and performs air sampling when it reaches the right limit block.

[0007] As a preferred embodiment of the present invention, when the sliding plate assembly moves, it can accurately move the paper tape from the sampling position to the detection position. The sampling body assembly is used to complete the sampling and detection functions, and the lead screw assembly provides kinetic energy for the left and right movement of the sliding plate assembly.

[0008] As a preferred embodiment of the present invention, a push block is provided at the upper end of the lead screw assembly, a spring guide rail is provided on the inner side of the push block, a grating strip is provided at the upper end of the push block, photoelectric switches are provided at both ends of the grating strip, a fixing block is provided on one side of the photoelectric switch, and the fixing block is fixed on the sliding plate assembly.

[0009] The present invention provides the following second technical solution:

[0010] The present invention also provides a control method for this atmospheric particulate matter sampling left and right paper shifting device, the specific steps of which are as follows:

[0011] A: Control the lead screw motor to rotate forward, push the block to move to the left, compress the spring guide rail to the left, the fixed block to move to the left, and the sliding plate assembly to move to the left. When the sliding plate assembly reaches the left limit block, the sampling spot reaches the detection position at the same time. The motor continues to rotate forward, the push block continues to move to the left, the spring guide rail continues to compress, and the grating strip on the push block touches the left photoelectric switch. The motor stops rotating forward. After reaching the limit switch, the push block continues to move to the left to ensure the absolute positioning contact between the sliding plate assembly and the left limit block.

[0012] B: The lead screw motor reverses, the push block moves to the right, compresses the spring guide rail to the right, the fixed block moves to the right, the sliding plate assembly moves to the right, the sliding plate assembly reaches the right limit block, ready for sampling, the motor continues to reverse, the push block continues to move to the right, the spring guide rail continues to compress, the grating strip on the push block touches the right photoelectric switch, the motor stops turning right, after reaching the limit switch, it continues to push to the right to ensure the absolute positioning contact between the sliding plate assembly and the right limit block;

[0013] C: The drive wheel motor rotates, the paper tape is wound up, the sampling spot from the previous cycle moves, the sampling head presses down, and a new sampling spot is formed. After the sampling cycle ends, step A is repeated to complete the entire cycle of sampling and detection.

[0014] In a preferred embodiment of the present invention, the distance from the sampling position to the detection position on the sampling body in step A is equal to the distance the sliding plate assembly moves.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1. This invention utilizes a straight tube sampling method in particulate matter sampling during left-right paper movement. This effectively reduces the impact of dust accumulation inside the tube. Simultaneously, moving the detection unit outside the gas path ensures that heating and dehumidifying the sample gas has no effect on photoelectricity, significantly improving detection accuracy. Precise positioning during paper movement ensures that the sampling spot is accurately delivered to the detection unit. In this structure, spring compression during paper movement eliminates over-positioning, thereby ensuring that the sliding plate assembly contacts the left and right limiting plates, achieving precise positioning. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0018] In the attached diagram, all identical reference numerals refer to the same components.

[0019] Furthermore, detailed descriptions of known technologies are omitted if they are unnecessary to illustrate the features of the present invention. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "inner" and "outer" refer to directions toward or away from the geometric center of a particular component, respectively.

[0020] In the attached diagram:

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a partial structural diagram of the lead screw assembly;

[0023] Figure 3 This is a schematic diagram of the planar structure of the present invention;

[0024] In the diagram: 1. Sliding plate assembly; 2. Sampling body assembly; 3. Lead screw assembly; 4. Left limit block; 5. Right limit block; 6. Spring guide rail; 7. Grating strip; 8. Photoelectric switch; 9. Fixing block; 10. Pushing block. Detailed Implementation

[0025] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0026] Example 1

[0027] like Figure 1-3 As shown, the present invention provides an atmospheric particulate matter sampling device with left and right paper shifting, including a sliding plate assembly 1, a sampling body assembly 2, a lead screw assembly 3, a left limiting block 4, and a right limiting block 5. The sliding plate assembly 1 consists of a driving wheel, a driven wheel, and a paper tape shaft. The sampling body assembly 2 consists of a sampling pressure head, a phototube, a β source, and a motor. The lead screw assembly 3 consists of a lead screw, a lead screw motor, a push block, and a spring guide rail. The left limiting block 4 and the right limiting block 5 are located on the left and right sides of the sliding plate assembly 1, respectively. When the sliding plate assembly 1 reaches the left limit of the left limiting block 4, detection is performed. When the sliding plate assembly 1 reaches the right limit of the right limiting block 5, air sampling is performed.

[0028] Furthermore, when the sliding plate assembly 1 moves, it can precisely move the paper tape from the sampling position to the detection position. The sampling body assembly 2 is used to complete the sampling and detection functions, and the lead screw assembly 3 provides kinetic energy for the left and right movement of the sliding plate assembly 1.

[0029] A push block 10 is provided at the upper end of the lead screw assembly 3. A spring guide rail 6 is provided on the inner side of the push block 10. A grating strip 7 is provided at the upper end of the push block 10. Photoelectric switches 8 are provided at both ends of the grating strip 7. A fixing block 9 is provided on one side of the photoelectric switch 8. The fixing block 9 is fixed on the sliding plate assembly 1.

[0030] A control method for a left-right shifting paper device for atmospheric particulate matter sampling, the specific steps of which are as follows:

[0031] A: Control the lead screw motor to rotate forward, push block 10 to move to the left, compress spring guide rail 6 to the left, fix block 9 to move to the left, slide plate assembly 1 to move to the left, slide plate assembly 1 reaches left limit block 4, at this time the sampling spot reaches the detection position at the same time, the motor continues to rotate forward, push block 10 continues to move to the left, spring guide rail 6 continues to compress, grating strip 7 on push block 10 touches left photoelectric switch 8, the motor stops rotating forward, after reaching the limit switch, continue to keep push block 10 moving to the left, so as to ensure absolute positioning contact between slide plate assembly 1 and left limit block 4;

[0032] B: The lead screw motor reverses, pushing block 10 moves to the right, compressing spring guide rail 6 to the right. Fixed block 10 moves to the right, sliding plate assembly 1 moves to the right, and sliding plate assembly 1 reaches right limit block 5, ready for sampling. The motor continues to reverse, pushing block 10 continues to move to the right, spring guide rail 6 continues to compress, and grating strip 7 on pushing block 10 touches right photoelectric switch 8. The motor stops turning right and continues to push to the right after reaching the limit switch, thereby ensuring absolute positioning contact between sliding plate assembly 1 and right limit block 5.

[0033] C: The drive wheel motor rotates, the paper tape is wound up, the sampling spot from the previous cycle moves, the sampling head presses down, and a new sampling spot is formed. After the sampling cycle ends, step A is repeated to complete the entire cycle of sampling and detection.

[0034] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A control method for a left-right shifting paper device for atmospheric particulate matter sampling, characterized in that, The atmospheric particulate matter sampling paper-shifting device includes a sliding plate assembly, a sampling body assembly, a lead screw assembly, a left limit block, and a right limit block. The sliding plate assembly consists of a driving wheel, a driven wheel, and a paper tape shaft. The sampling body assembly consists of a sampling pressure head, a phototube, a β source, and a motor. The lead screw assembly consists of a lead screw, a lead screw motor, a push block, and a spring guide rail. The left and right limit blocks are located on the left and right sides of the sliding plate assembly, respectively. The sliding plate assembly is detected when it reaches the left limit block, and the sliding plate assembly is sampled when it reaches the right limit block. A push block is provided at the upper end of the lead screw assembly, and a spring guide rail is provided inside the push block. A grating strip is provided at the upper end of the push block, and photoelectric switches are provided at both ends of the grating strip. A fixing block is provided on one side of the photoelectric switch, and the fixing block is fixed to the sliding plate assembly. The specific steps of the control method are as follows: A: Control the lead screw motor to rotate forward, the push block moves to the left, compresses the spring guide rail to the left, the fixed block moves to the left, the sliding plate assembly moves to the left, the sliding plate assembly reaches the left limit block, at this time the sampling spot reaches the detection position at the same time, the motor continues to rotate forward, the push block continues to move to the left, the spring guide rail continues to compress, the grating strip on the push block touches the left photoelectric switch, the motor stops rotating forward, after reaching the limit switch, the push block continues to move to the left, thus ensuring the absolute positioning contact between the sliding plate assembly and the left limit block; B: The lead screw motor reverses, the push block moves to the right, compresses the spring guide rail to the right, the fixed block moves to the right, the sliding plate assembly moves to the right, the sliding plate assembly reaches the right limit block, ready for sampling, the motor continues to reverse, the push block continues to move to the right, the spring guide rail continues to compress, the grating strip on the push block touches the right photoelectric switch, the motor stops turning right, after reaching the limit switch, it continues to push to the right to ensure the absolute positioning contact between the sliding plate assembly and the right limit block; C: The drive wheel motor rotates, the paper tape is collected, the sampling spot of the previous cycle moves, the sampling head is pressed down, and a new sampling spot is formed. After the sampling cycle ends, the action process of step A is repeated to complete the entire cycle sampling and detection.

2. The control method for a left-right shifting paper device for atmospheric particulate matter sampling according to claim 1, characterized in that, In step A, the distance from the sampling position to the detection position on the sampling body is equal to the distance the sliding plate assembly moves.

3. The control method for a left-right shifting paper device for atmospheric particulate matter sampling according to claim 1, characterized in that, When the sliding plate assembly moves, it can precisely move the paper tape from the sampling position to the detection position. The sampling body assembly is used to complete the sampling and detection functions, and the lead screw assembly provides kinetic energy for the left and right movement of the sliding plate assembly.

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