Sensor fixing structure for negative oxygen ion monitor

By adjusting the threaded connection between the screw and the moving sleeve and using a quick-release mechanism, the stability and convenience of the sensor fixing structure of the negative oxygen ion monitor were solved, enabling precise height adjustment of the sensor and simplified maintenance operations, thereby improving the stability and data accuracy of the monitor.

CN223825963UActive Publication Date: 2026-01-23CHENGDU JINBANGNAI TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202520757540.8
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-04-21
Publication Date
2026-01-23
Estimated Expiration
2035-04-21

AI Technical Summary

Technical Problem

The sensor fixing structure of existing negative oxygen ion monitors has problems such as unstable installation, inconvenient height adjustment, and difficulty in disassembly, which affects the accuracy of monitoring data and the efficiency of equipment maintenance.

Method used

The sensor height can be flexibly adjusted and securely clamped by using a threaded connection between the adjusting screw and the moving sleeve, combined with a rotational connection between the control screw and the limiting clamp. The quick disassembly mechanism simplifies the installation and disassembly of the filter plate and calibration instrument through a frame, swing buckle and pin structure. The lifting assembly uses connectors and fixing bolts to ensure the stability of the instrument housing.

Benefits of technology

It enables precise height adjustment and secure clamping of the sensor, simplifies the installation and disassembly of the air filter plate and calibration instrument, improves the stability and maintenance efficiency of the monitor, and ensures the accuracy of the monitoring data.

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Abstract

The utility model relates to the technical field of environment monitoring equipment, and discloses a sensor fixing structure for a negative oxygen ion monitor, which comprises a monitor shell, the bottom of the monitor shell is in threaded connection with a fixing base, the bottom of the fixing base is provided with an adjusting and fixing mechanism, and the inside of the monitor shell is provided with a quick dismounting mechanism. The adjusting and fixing mechanism comprises a supporting sleeve, the top of the supporting sleeve is fixedly connected to the bottom of the fixed base, the supporting sleeve is sleeved with a movable sleeve, the interior of the movable sleeve is in threaded connection with an adjusting screw rod, and the exterior of the movable sleeve is fixedly connected with a clamping device. And a control screw rod is rotationally connected to the interior of the clamp holder. According to the utility model, through the threaded connection between the adjusting screw rod and the movable sleeve, the flexible adjustment effect on the height of the holder is realized, so that the clamped sensor can accurately reach a proper monitoring height, and the monitoring requirements in different scenes are met.
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Description

Technical Field

[0001] This utility model relates to the field of environmental monitoring equipment technology, and in particular to a sensor fixing structure for a negative oxygen ion monitor. Background Technology

[0002] Negative ion monitors, as important environmental monitoring equipment, are widely used in air quality monitoring, forest scenic areas, sanatoriums, and other locations. With increasing demands for air quality, the accuracy and stability of negative ion monitors have become key areas of technological development. Currently, most negative ion monitors on the market collect data through sensors; however, the sensor mounting structures often suffer from instability, inconvenient height adjustment, and difficulty in disassembly, affecting the accuracy of monitoring data and the efficiency of equipment maintenance. In recent years, with the increasing demand for environmental monitoring, higher requirements have been placed on the sensor mounting structures, necessitating a mounting structure that balances stability, adjustability, and convenience.

[0003] In existing technologies, the sensor fixing structures of negative ion monitors mainly fall into three categories: First, the sensor is directly fixed to the instrument housing with bolts. This method is simple but inconvenient to disassemble and has no height adjustment. Second, a snap-on fixing structure is used, which is easy to disassemble but has poor stability and is prone to sensor displacement due to vibration. Third, a sliding rail structure is used to achieve height adjustment. While this solves the height problem, the structure is complex and costly. Furthermore, replacing the filter plate and calibration instrument in existing technologies is also cumbersome, usually requiring specialized tools or complex operating procedures.

[0004] Existing technologies have several drawbacks, including inconvenient installation and disassembly, increased maintenance difficulty, difficulty in adjusting sensor height, inability to meet the needs of different detection environments, insufficient stability of the fixing structure, susceptibility to sensor displacement due to external factors affecting the accuracy of monitoring data, and cumbersome replacement process for the filter plate and calibration instrument, which reduces the practicality of the equipment and user experience. To address these issues, a sensor fixing structure for a negative oxygen ion monitor is proposed. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a sensor fixing structure for a negative oxygen ion monitor, aiming to improve the contradiction between the stability and easy disassembly of the sensor fixing structure in some existing devices, as well as the problem of inconvenient adjustment of the sensor collection head height.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A sensor fixing structure for a negative oxygen ion monitor includes a housing, a fixed base threadedly connected to the bottom of the housing, an adjusting fixing mechanism at the bottom of the fixed base, a quick disassembly mechanism inside the housing, and a support sleeve with its top fixedly connected to the bottom of the fixed base. A movable sleeve is fitted around the support sleeve, an adjusting screw is threadedly connected to the inside of the movable sleeve, a clamp is fixedly connected to the outside of the movable sleeve, a control screw is rotatably connected to the inside of the clamp, a limiting clamp is fixedly connected to the inside of the clamp, a movable clamp is slidably connected to the inside of the clamp, and a lifting assembly is fixedly connected to the outside of the housing.

[0008] The above technical solution involves first adjusting the height of the instrument housing using the lifting assembly, then rotating the adjusting screw to move the movable sleeve on the supporting sleeve, thereby adjusting the height of the clamp to position the sensor appropriately. Finally, rotating the control screw causes the movable clamping plate to move closer to the limiting clamping plate within the clamp, clamping the sensor. The fixed base connects the instrument housing to the adjusting and fixing mechanism.

[0009] As a further description of the above technical solution:

[0010] The quick disassembly mechanism includes a retaining frame, which is fixedly connected to the inner wall of the instrument housing. A filter plate is snapped into the inside of the retaining frame, and a calibration instrument is snapped into the inside of the retaining frame. A mounting base is fixedly connected to the outside of the retaining frame, and a swing buckle is slidably connected inside the mounting base. A stop rod is rotatably connected inside the swing buckle.

[0011] The above technical solution allows for the following steps: When installing the air filter plate and calibration instrument, insert them into the clip frame, then slide and rotate the swing buckle to drive the retaining rod into the air filter plate and calibration instrument, thus completing the fixation. To disassemble, reverse the swing buckle to disengage the retaining rod, allowing the air filter plate and calibration instrument to be removed.

[0012] As a further description of the above technical solution:

[0013] The mounting base is externally fixedly connected with a pin, and the swing buckle is externally fixedly connected with a button;

[0014] The above technical solution involves installing the air filter plate and calibration instrument into the frame, pressing the button to swing the swing buckle to insert the stop rod, then inserting the pin. To disassemble, pull out the pin and press the button to release the stop rod.

[0015] As a further description of the above technical solution:

[0016] The bottom inside the instrument housing is fitted with a buckle, a rubber ring is installed on the outside of the buckle, and a sensor is fitted on the inside top of the buckle;

[0017] The above technical solution allows for the following steps: When installing the sensor, it is snapped into the inner side of the top of the buckle, and the rubber ring fits in place. When disassembling, the sensor is removed from the buckle, thus completing the installation and disassembly of the sensor.

[0018] As a further description of the above technical solution:

[0019] The lifting assembly includes a connector, the outside of which is fixedly connected to the outside of the instrument housing, the inside of which is slidably connected to a vertical rod, and the inside of which is threadedly connected to a fixing bolt, the outside of which is snapped into the inside of the vertical rod.

[0020] The above technical solution involves loosening the fixing bolts, allowing the connector to slide on the upright, which in turn adjusts the height of the instrument housing. Once the height is determined, the fixing bolts are tightened to lock it into the upright, thus completing the fixation.

[0021] As a further description of the above technical solution:

[0022] A fixing base is fixedly connected to the bottom of the pole, and a solar panel is installed on the top of the pole;

[0023] The above technical solution involves fixing the mounting base to a flat surface such as the ground to support the upright pole. Once the upright pole is stable, the solar panel on top can receive sunlight and convert solar energy into electrical energy to power the monitoring instrument.

[0024] As a further description of the above technical solution:

[0025] The outer side of the control screw is rotatably connected to the inside of the limiting clamp, the outer thread of the control screw is connected to the inside of the moving clamp, and the outer end of the adjusting screw is rotatably connected to the inside of the support sleeve.

[0026] The above technical solution involves rotating the adjusting screw to raise and lower the moving sleeve and clamp, and rotating the control screw to allow the moving clamp to slide within the clamp under the cooperation of the limiting clamp, thereby clamping or releasing the object.

[0027] As a further description of the above technical solution:

[0028] The outside of the abutment is engaged with the inside of the calibration instrument, and the outside of the abutment is engaged with the inside of the filter plate;

[0029] The above technical solution allows for convenient installation and disassembly: during installation, the swing buckle connected to the support rod is swung to engage the support rod with the air filter plate and calibration instrument; during disassembly, the swing is reversed to disengage the support rod from both, thus achieving convenient installation and disassembly operations.

[0030] This utility model has the following beneficial effects:

[0031] 1. In this utility model, by adjusting the threaded connection between the screw and the movable sleeve, the movable sleeve is driven to move up and down on the support sleeve, thereby achieving a flexible adjustment effect on the height of the clamp, enabling the clamped sensor to accurately reach the appropriate monitoring height and adapt to the monitoring needs in different scenarios. By controlling the rotational connection between the screw and the limiting clamp, and controlling the threaded connection structure between the screw and the movable clamp, the movable clamp is driven to slide within the clamp and gradually approach the limiting clamp, thereby achieving a stable clamping effect on the sensor, ensuring the stability of the monitor during operation, and reducing the impact of shaking, displacement, and other factors on the accuracy of monitoring data.

[0032] 2. In this utility model, the combination of the clip frame, swing buckle, stop rod, and pin structure enables the installation and fixing of the air filter plate and calibration instrument to be completed efficiently and stably, solving the problems of cumbersome operation, unstable fixing, and difficulty in maintenance and replacement of traditional fixing methods. With the cooperation of the clip and rubber ring structure, the installation of the sensor is more stable and reliable, and at the same time, it can effectively achieve sealing and buffering, so as to solve the problems of unstable sensor installation, easy interference from external factors and vibration, resulting in inaccurate monitoring data. Attached Figure Description

[0033] Figure 1 This is a three-dimensional schematic diagram of a sensor fixing structure for a negative oxygen ion monitor proposed in this utility model;

[0034] Figure 2 This is a schematic diagram of the fixing base of a sensor fixing structure for a negative oxygen ion monitor proposed in this utility model;

[0035] Figure 3 This is a schematic diagram of the buckle structure for fixing the sensor of a negative oxygen ion monitor proposed in this utility model;

[0036] Figure 4 This is a schematic diagram of the card frame for fixing the sensor of a negative oxygen ion monitor proposed in this utility model;

[0037] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0038] Figure 6 This is a schematic diagram of the support sleeve for fixing the sensor of a negative oxygen ion monitor proposed in this utility model.

[0039] Legend:

[0040] 1. Instrument housing; 2. Fixed base; 3. Adjustment and fixing mechanism; 31. Support sleeve; 32. Moving sleeve; 33. Adjusting screw; 34. Clamp; 35. Control screw; 36. Restricting clamp; 37. Moving clamp; 38. Lifting assembly; 381. Connector; 382. Fixing bolt; 4. Quick disassembly mechanism; 41. Frame; 42. Filter plate; 43. Calibration instrument; 44. Mounting base; 45. Swing buckle; 46. Support rod; 47. Button; 48. Pin; 49. Buckle; 410. Rubber ring; 411. Sensor; 5. Upright pole; 6. Fixed base; 7. Solar panel. Detailed Implementation

[0041] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0042] Reference Figure 1 , Figure 2 and Figure 6This utility model provides an embodiment of a sensor fixing structure for a negative oxygen ion monitor, including a housing 1. The housing 1 serves as the outer shell of the entire monitor, providing protection and support to prevent damage to the internal components from external environmental factors. A fixing base 2 is threadedly connected to the bottom of the housing 1, serving as a connection and support, and also providing an installation base for an adjustment fixing mechanism 3. The adjustment fixing mechanism 3 is located at the bottom of the fixing base 2. A quick-release mechanism 4 is provided inside the housing 1. The adjustment fixing mechanism 3 includes a support sleeve 31, which provides support and guidance for a movable sleeve 32 and an adjusting screw 33, allowing the movable sleeve 32 to move along the support sleeve 31. The top of the support sleeve 31 is fixedly connected to the bottom of the fixing base 2. The movable sleeve 32 is sleeved on the outside of the support sleeve 31, and the inside of the movable sleeve 32 is threadedly connected to the adjusting screw 33. By rotating the adjusting screw 33... The movable sleeve 32 can move up and down on the support sleeve 31 to adjust the height of the clamp 34. The movable sleeve 32 is internally threaded with an adjusting screw 33. The adjusting screw 33 uses the principle of thread transmission to move the movable sleeve 32 on the support sleeve 31 to adjust the height of the clamp 34. The clamp 34 is externally fixedly connected to the movable sleeve 32. The clamp 34 is used to support and provide a sliding track. The clamp 34 is internally rotatably connected with a control screw 35. The outer side of the control screw 35 is rotatably connected to the inside of the limiting clamp 36 and threadedly connected to the inside of the movable clamp 37. The limiting clamp 36 is internally fixedly connected to the clamp 34. The limiting clamp 36 serves as a fixed reference for clamping the object. The movable clamp 37 is internally slidably connected to the clamp 34. The movable clamp 37 cooperates with the limiting clamp 36 to clamp and release the object. The lifting assembly 38 is externally fixedly connected to the housing 1.

[0043] Specifically, the housing 1 provides protection and support, and its bottom is connected to the fixed base 2 via threads. The fixed base 2 provides the mounting base for the adjustment and fixing mechanism 3. In the adjustment and fixing mechanism 3, the top of the support sleeve 31 is fixed to the bottom of the fixed base 2, providing support and guidance for the movable sleeve 32 and the adjusting screw 33. Rotating the adjusting screw 33 allows the movable sleeve 32 to move on the support sleeve 31, thereby adjusting the height position of the clamp 34. One side of the control screw 35 inside the clamp 34 is rotatably connected to the limiting clamp 36, and at the same time, it is threadedly connected to the movable clamp 37. Rotating the control screw 35 allows the movable clamp 37 to slide within the clamp 34, cooperating with the limiting clamp 36 to clamp and release the object.

[0044] The lifting assembly 38 includes a connector 381, which is fixed to different positions on the upright 5 by fixing bolts 382. The connector 381 is externally fixed to the outside of the instrument housing 1, and the upright 5 is slidably connected to the inside of the connector 381, providing support for the monitoring instrument. The fixing bolts 382 are threadedly connected to the inside of the connector 381, and their external parts are snapped into the inside of the upright 5. A fixed base 6 is fixedly connected to the bottom. The fixed base 6 is used to fix the pole 5 to the ground or other installation plane to ensure the stability of the entire monitoring instrument. A solar panel 7 is installed on the top of the pole 5. The solar panel 7 converts solar energy into electrical energy to provide power support for the monitoring instrument, realize the use of green energy, and reduce dependence on external power sources. The outer side of the control screw 35 is rotatably connected to the inside of the limiting clamp 36. The outer thread of the control screw 35 is connected to the inside of the moving clamp 37. The outer end of the adjusting screw 33 is rotatably connected to the inside of the support sleeve 31.

[0045] Specifically, the lifting assembly 38 consists of a connector 381 and a fixing bolt 382 as key components. The connector 381 is fixed to the outside of the instrument housing 1, providing a reliable connection for the height adjustment of the instrument housing 1. The connector 381 has a sliding groove inside that matches the upright 5, allowing the upright 5 to slide within it. Corresponding to the sliding groove inside the connector 381, there is a threaded hole for threaded connection with the fixing bolt 382. When the fixing bolt 382 is screwed into place, its other end will extend and engage with the pre-set equally spaced slots on the side of the upright 5, ensuring a tight fit with the end of the fixing bolt 382. This allows the connector 381 to be securely fixed to different positions on the upright 5. The upright 5 is strong enough to support the weight of the monitor and the solar panel 7 installed on top of it. A fixing seat 6 is fixedly connected to the bottom of the upright 5. The bottom of the fixing seat 6 has multiple mounting holes, which are bolted to the ground or other mounting surfaces, thus providing stable and reliable support for the entire monitor system and ensuring that the monitor remains stable under different environmental conditions, unaffected by external wind, vibration, or other factors.

[0046] Reference Figures 3 to 5The quick-release mechanism 4 includes a frame 41, which provides mounting positions for the air filter plate 42 and the calibration instrument 43. The frame 41 is fixedly connected to the inner wall of the instrument housing 1. The air filter plate 42 is engaged inside the frame 41, filtering the air entering the monitor to remove dust, impurities, and other pollutants, ensuring the cleanliness of the air inside the monitor and improving the accuracy of the monitoring data. The calibration instrument 43 is engaged inside the frame 41 to calibrate the monitor, ensuring the accuracy and reliability of the monitor's measurement data. A mounting base 44 is fixedly connected to the outside of the frame 41, providing the mounting position. A swing buckle 45 is slidably connected inside the mounting base 44, and a stop rod 46 is rotatably connected inside the swing buckle 45. By swinging the swing buckle 45, the stop rod 46 can engage or disengage with the air filter plate 42 and the calibration instrument 43. The stop rod 46 is rotatably connected inside the swing buckle 45, and the stop rod 46 is engaged by the swing of the swing buckle 45. The system enables the locking and unlocking of the filter plate 42 and the calibration instrument 43, thereby achieving quick disassembly and installation. The mounting base 44 is externally fixedly connected to a pin 48, which is used to limit the swing range of the swing buckle 45. The swing buckle 45 is externally fixedly connected to a button 47, which allows for convenient operation of the swing buckle 45 by pressing the button 47. The bottom of the instrument housing 1 is internally secured to a buckle 49, which is used to install a sensor 411. A rubber ring 410 is installed on the outside of the buckle 49, which serves as a seal and buffer to prevent external dust, moisture, etc. from entering the buckle 49. The top inner side of the buckle 49 is secured to a sensor 411, which is used to receive parameters such as the concentration of negative oxygen ions, convert the sensor signal into an electrical signal, and transmit it to the monitoring instrument's processing system for analysis and processing. The external end of the rod 46 is externally secured to the inside of the calibration instrument 43, and the external end of the rod 46 is externally secured to the inside of the filter plate 42.

[0047] Specifically, the frame 41 is fixed to the inner wall of the instrument housing 1 to engage the filter plate 42 and the calibration instrument 43. The mounting base 44 is fixed to the outside of the frame 41 to provide mounting positions for the swing buckle 45, the stainless steel abutment 46 and the pin 48. The swing buckle 45 is rotatably connected to the abutment 46. Pressing the button 47 can swing the swing buckle 45, so that the abutment 46 engages or disengages from the filter plate 42 and the calibration instrument 43, realizing quick disassembly and installation. The pin 48 is used to limit the swing range of the swing buckle 45. The buckle 49 is engaged inside the bottom side of the instrument housing 1 to install the sensor 411. The rubber ring 410 installed on the outside of the buckle 49 plays a sealing and buffering role.

[0048] Working principle: When installing the negative ion monitor, first fix the base 6 on the ground and fix the pole 5 on the base 6. Loosen the fixing bolt 382 on the connector 381 so that the connector 381 can slide freely on the pole 5. After moving the device housing 1 to a suitable height according to actual needs, tighten the fixing bolt 382 so that its outside is inserted into the inside of the pole 5, and fix the connector 381 on the pole 5, thereby determining the height position of the device housing 1. Rotate the adjusting screw 33. Since the adjusting screw 33 is threadedly connected to the moving sleeve 32, the moving sleeve 32 will move up and down on the support sleeve 31, thereby adjusting the height of the clamp 34 so that the sensor it clamps reaches a suitable height. Rotate the control screw 35. The control screw 35 rotates in the limiting clamp 36, and at the same time drives the moving clamp 37 threadedly connected to it to slide in the clamp 34, gradually approaching the limiting clamp 36, and finally clamping the sensor, completing the fixing of the monitor.

[0049] Inside the monitor, the quick-release mechanism 4 facilitates the maintenance and replacement of the air filter plate 42 and the calibration instrument 43. When the air filter plate 42 and the calibration instrument 43 need to be installed, they are snapped into the frame 41, and then the swing buckle 45 is swung so that the abutment rod 46 is snapped into the air filter plate 42 and the calibration instrument 43. Then, the pin 48 is inserted into the gap of the swing buckle 45 so that the air filter plate 42 and the calibration instrument 43 are fixed in the frame 41. To disassemble, the pin 48 is pulled out, the button 47 is pressed, and the swing buckle 45 is swung so that the abutment rod 46 is disengaged from the air filter plate 42 and the calibration instrument 43, so that they can be taken out from the frame 41. The buckle 49 is snapped into the bottom inside the instrument housing 1 for installing the sensor 411. The rubber ring 410 plays a sealing and buffering role.

[0050] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model 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 utility model should be included within the protection scope of the present utility model.

Claims

1. A sensor fixing structure for a negative oxygen ion monitor, comprising a housing (1), characterized in that: The bottom of the instrument housing (1) is threadedly connected to a fixed base (2), and the bottom of the fixed base (2) is provided with an adjustment and fixing mechanism (3). The inside of the instrument housing (1) is provided with a quick disassembly mechanism (4). The adjusting and fixing mechanism (3) includes a support sleeve (31), the top of which is fixedly connected to the bottom of the fixed base (2). A movable sleeve (32) is sleeved on the outside of the support sleeve (31). An adjusting screw (33) is threaded inside the movable sleeve (32). A clamp (34) is fixedly connected to the outside of the movable sleeve (32). A control screw (35) is rotatably connected inside the clamp (34). A limiting clamp (36) is fixedly connected inside the clamp (34). A movable clamp (37) is slidably connected inside the clamp (34). A lifting assembly (38) is fixedly connected to the outside of the instrument housing (1).

2. The sensor fixing structure for a negative oxygen ion monitor according to claim 1, characterized in that: The quick disassembly mechanism (4) includes a frame (41), which is fixedly connected to the inner wall of the instrument housing (1). A filter plate (42) is snapped into the inside of the frame (41), and a calibration instrument (43) is snapped into the inside of the frame (41). A mounting base (44) is fixedly connected to the outside of the frame (41). A swing buckle (45) is slidably connected inside the mounting base (44), and a stop rod (46) is rotatably connected inside the swing buckle (45).

3. The sensor fixing structure for a negative oxygen ion monitor according to claim 2, characterized in that: The mounting base (44) is externally fixedly connected to a pin (48), and the swing buckle (45) is externally fixedly connected to a button (47).

4. The sensor fixing structure for a negative oxygen ion monitor according to claim 2, characterized in that: The inner bottom side of the instrument housing (1) is fitted with a buckle (49), a rubber ring (410) is installed on the outside of the buckle (49), and a sensor (411) is fitted on the top inner side of the buckle (49).

5. The sensor fixing structure for a negative oxygen ion monitor according to claim 1, characterized in that: The lifting assembly (38) includes a connector (381), which is externally fixedly connected to the outside of the instrument housing (1). A vertical rod (5) is slidably connected inside the connector (381), and a fixing bolt (382) is threaded inside the connector (381). The fixing bolt (382) is externally snapped into the inside of the vertical rod (5).

6. The sensor fixing structure for a negative oxygen ion monitor according to claim 5, characterized in that: The bottom of the pole (5) is fixedly connected to a mounting base (6), and the top of the pole (5) is equipped with a solar panel (7).

7. The sensor fixing structure for a negative oxygen ion monitor according to claim 1, characterized in that: The outer side of the control screw (35) is rotatably connected to the inside of the limiting clamp (36), the outer thread of the control screw (35) is connected to the inside of the moving clamp (37), and the outer end of the adjusting screw (33) is rotatably connected to the inside of the support sleeve (31).

8. The sensor fixing structure for a negative oxygen ion monitor according to claim 2, characterized in that: The external of the abutment (46) is engaged with the inside of the calibration instrument (43), and the external of the abutment (46) is engaged with the inside of the air filter plate (42).