Photoelectric dust concentration detector for continuously detecting dust concentration in fireproof and explosion-proof processes

Abstract

The invention relates to the technical field of dust concentration detection, and particularly provides a photoelectric dust concentration detector for continuously detecting dust concentration in fire and explosion prevention, which comprises a base. The first standard light source emits light with specific light intensity, after the light beam passes through an environment to be detected, the light intensity detector located on the right side can detect the emergent light intensity, meanwhile, the light intensity detector located in the front can detect the reflected light intensity, and then the dust concentration is obtained after calculation is conducted through the calculation component. The second mounting plate and the first mounting plate are rotationally connected through a connecting shaft and are fixed through a manual adjusting bolt, a fixing block, a clamping block and a limiting gear at the same time, a light intensity detector used for detecting the intensity of reflected light can be rotated to different positions, an extension spring is stretched by pulling down an insertion fixing rod, and the upper end of the insertion fixing rod is separated from the interior of an insertion fixing hole. Therefore, the plug board can be moved, the positions of the two light intensity detectors can be adjusted, and the distance between the light intensity detectors and the first standard light source can be changed.

Description

Technical Field

[0001] This invention relates to the field of dust concentration detection technology, and in particular to a photoelectric dust concentration detector for continuous detection of dust concentration in fireproof and explosion-proof applications. Background Technology

[0002] Dust concentration refers to the mass or number of dust particles contained in a unit volume of air. Standard values ​​for dust concentration vary depending on the source: generally, dust concentration in workplaces should not exceed 10 mg / m³. 3 The maximum permissible concentration of general dust in the workshop air is 10 mg / m³. 3 Dust containing more than 10% free silica is 2 mg / m³. 3 Within 8 hours, the average dust concentration in the workshop was below 1 mg / m³. 3 At this concentration, it is harmless to the human body; the concentration is between 1 and 3 mg / m³. 3 Within a certain range, it poses some harm; above 3mg / m³ 3 At times, it poses a significant hazard; the maximum permissible value is 10 mg / m³. 3 The national standard for dust concentration in workshops and workplaces is 0.5-4 mg / m³. 3 The maximum permissible value is 10 mg / m³. 3 Furthermore, dust concentration is closely related to explosiveness; therefore, explosion-proof dust concentration detectors and alarms are widely used in hazardous environments to monitor dust concentration and issue alarms when necessary to ensure the safety of industrial sites. To protect human health and safety, it is essential to strictly control workplace dust concentrations within safe standards. Given the high incidence of dust explosions in recent years, monitoring dust concentrations in the environment is therefore crucial.

[0003] Current methods for detecting dust concentration primarily involve sampling the environment at a specific time point or time interval, then simulating the sampling conditions in a laboratory before analysis. This approach suffers from drawbacks such as low efficiency, discontinuity, lack of online operation, and poor fit between the test results and actual conditions. This significantly weakens the effectiveness of pre-explosion control of dust and indirectly induces various dust explosion accidents. Therefore, it is necessary to provide a photoelectric dust concentration detector for continuous dust concentration detection in fire and explosion protection applications to solve the aforementioned technical problems. Summary of the Invention

[0004] The technical problem this invention aims to solve is that the main method for detecting dust concentration in existing technologies involves sampling the environment at a specific time point or time period, returning to the laboratory to simulate the conditions of the sampling environment, and then performing analysis. This method suffers from drawbacks such as low efficiency, discontinuity, non-online operation, and poor fit between the detection results and the actual situation, severely weakening the effectiveness of dust explosion prevention control and indirectly inducing various dust explosion accidents. To address these shortcomings of existing technologies, this invention provides a photoelectric dust concentration detector for continuous dust concentration detection in fire and explosion prevention applications, comprising: a base. This invention uses a first standard light source to emit light of a specific intensity. After this beam passes through the environment to be tested, the emitted light intensity is detected by a light intensity detector located on the right side, and the reflected light intensity is detected by a light intensity detector located in front. The dust concentration is then calculated by a computing unit. The second mounting plate is rotatably connected to the first mounting plate by a connecting shaft, and is also fixed by a hand-adjusting bolt, a fixing block, a locking block and a limiting gear. This allows the light intensity detector used to detect reflected light intensity to be rotated to different positions. Furthermore, by pulling down the insertion rod, the tension spring is stretched, allowing the upper end of the insertion rod to disengage from the insertion hole. This enables the insertion plate to be moved, the positions of the two light intensity detectors to be adjusted, and the distance between the light intensity detector and the first standard light source to be changed.

[0005] To achieve the above objectives, the technical solution of the present invention is: a photoelectric dust concentration detector for continuous dust concentration detection in fireproof and explosion-proof applications, comprising: a base, a hollow column fixedly mounted on the upper surface of the base, a support column inserted inside the hollow column, and a hinge seat fixedly connected to the upper end of the support column; a support structure, comprising a first mounting plate and a third mounting plate disposed above the support column, the front surface of the first mounting plate having a receiving groove, a connecting shaft rotatably connected to the inner side of the receiving groove, a second mounting plate and a limiting gear respectively sleeved on the outer side of the connecting shaft, a fixing block fixedly mounted on the upper surface of the first mounting plate, a hand-adjusting bolt screwed inside the fixing block, a locking block engaging with the limiting gear at one end of the hand-adjusting bolt, and a... The system includes a slot for inserting a plate, the upper surface of which is evenly provided with multiple insertion holes. A tension spring is fixedly installed at the bottom of the second and third mounting plates, and the lower end of the tension spring is fixedly connected to an insertion rod that inserts into the insertion hole. A small dust detection structure includes a threaded sleeve fixedly mounted inside a hollow column. An internal detection tube penetrating the base is screwed into the threaded sleeve. A second standard light source and a light intensity detection element are fixedly mounted on the inner side of the internal detection tube. A fixing structure is used to connect and fix the first mounting plate, the hinge base, and the third mounting plate. A light source structure is fixedly mounted on the upper surface of the first mounting plate to provide illumination for detecting dust concentration. Two light intensity detection structures are provided, fixedly mounted at one end of the insert plate, for detecting light intensity.

[0006] Furthermore, an electric telescopic rod is fixedly installed on the inner side of the hollow column, and the upper end of the electric telescopic rod is fixedly connected to the column.

[0007] Furthermore, the light source structure includes a first standard light source disposed above the first mounting plate, and each light intensity detection structure includes a light intensity detector.

[0008] Furthermore, the light source structure also includes a first support connected to the first mounting plate, and the light intensity detection structure also includes a second support connected to the plug-in plate. Both the second support and the first support have connecting through holes on their outer sides, and the outer sides of the first standard light source and the light intensity detector are fixedly installed with connecting posts that are plugged into the connecting through holes.

[0009] Furthermore, a return spring is fixedly installed on the upper surface of both the second support and the first support. The upper end of the return spring is fixedly connected to a pin that communicates with the connecting through hole, and the lower end of the pin is inserted into the connecting post.

[0010] Furthermore, the pin has a T-shaped structure and is located inside the return spring.

[0011] Furthermore, the bracket structure also includes two rotating shafts rotatably connected to the hinge seat, with the outer side of the left rotating shaft fixedly connected to the first mounting plate, and the outer side of the right rotating shaft fixedly connected to the third mounting plate.

[0012] Furthermore, the fixing structure also includes a square block sleeved on the outside of the rotating shaft. The front surface of the hinge seat is symmetrically fixedly equipped with protrusions. The interior of the two protrusions is rotatably connected to a bidirectional screw. The outer side of the bidirectional screw is symmetrically screwed with threaded tubes. One end of each threaded tube is rotatably connected to a positioning element that engages with the square block.

[0013] Furthermore, the fixing structure also includes an operating knob sleeved on the outside of the bidirectional screw, the operating knob being located between two protrusions.

[0014] Furthermore, the rear surface of the positioning member is in contact with the hinge seat, and the positioning member has a U-shaped structure.

[0015] Compared with related technologies, the photoelectric dust concentration detector for continuous dust concentration detection in fire and explosion protection provided by the present invention has the following beneficial effects:

[0016] This invention provides a photoelectric dust concentration detector for continuous dust concentration detection in fireproof and explosion-proof applications. A first standard light source emits light of a specific intensity. After this beam passes through the environment to be tested, the emitted light intensity is detected by a light intensity detector located on the right, while the reflected light intensity is detected by a light intensity detector located in front. The dust concentration is then calculated by a computing unit. A second mounting plate is rotatably connected to the first mounting plate via a connecting shaft, and is secured by a hand-adjusting bolt, a fixing block, a locking block, and a limiting gear. This allows the light intensity detector used to detect reflected light intensity to be rotated to different positions. Furthermore, by pulling down the insertion rod, the tension spring is stretched, causing the upper end of the insertion rod to disengage from the insertion hole. This allows the insertion plate to be moved, adjusting the positions of the two light intensity detectors and changing the distance between the light intensity detectors and the first standard light source, thereby improving the adaptability of dust concentration detection and enhancing its practicality. Utilizing a small dust detection structure, it can be used to detect small environments. This invention addresses the shortcomings of existing technologies for detecting dust concentration, which involve sampling the environment at a specific time point or time period, returning to the laboratory to simulate the conditions of the sampling environment, and then conducting analysis. These methods suffer from low efficiency, discontinuity, non-online operation, and poor fit between the test results and the actual situation, severely weakening the effectiveness of dust explosion prevention and control and indirectly inducing various dust explosion accidents.

[0017] This invention provides a photoelectric dust concentration detector for continuous dust concentration detection in fireproof and explosion-proof applications. The first standard light source and the first support, as well as the light intensity detector and the second support, are connected via connecting through holes and connecting posts. By pulling up the pin, the return spring is stretched, causing the lower end of the pin to disengage from the connecting post. This facilitates the removal of the connecting post from the connecting through hole, enabling easy replacement of different types of first standard light sources. It also facilitates the removal of the first standard light source and the light intensity detector from the concentration detector for use in specific environments, thus improving adaptability.

[0018] This invention provides a photoelectric dust concentration detector for continuous dust concentration detection in fireproof and explosion-proof applications. A first mounting plate housing the light source structure and a third mounting plate housing the light intensity detection structure are both rotatably connected to a hinged base via a rotating shaft. By rotating an operating knob, a bidirectional screw connected to it rotates, controlling the two threaded tubes on the outer side to disengage the positioning element from the outer side of the square block. This releases the fixation on the first and third mounting plates, allowing them to be rotated downwards to a position parallel to the hollow column and then fixed, reducing space occupation and facilitating portability. Attached Figure Description

[0019] Figure 1This is a schematic diagram of a preferred embodiment of a photoelectric dust concentration detector for continuous dust concentration detection in fire and explosion protection applications provided by the present invention.

[0020] Figure 2 This is a partial enlarged view of part A of the present invention;

[0021] Figure 3 This is a front view schematic diagram of the connection between the second support and the third mounting plate of the present invention.

[0022] Figure 4 This is a three-dimensional structural diagram of the connection between the first mounting plate, the third mounting plate, and the hinge seat of the present invention.

[0023] Figure 5 This is a three-dimensional structural diagram of the connection between the first support and the first standard light source of the present invention;

[0024] Figure 6 This is a schematic diagram of the main structure of the present invention;

[0025] Figure 7 This is a schematic diagram of the small dust detection structure of the present invention.

[0026] The diagram labels are as follows: 1. Base; 2. Hollow column; 3. First mounting plate; 4. First support; 5. First standard light source; 6. Second mounting plate; 7. Hinge seat; 8. Third mounting plate; 9. Light intensity detector; 10. Support column; 11. Second support; 12. Receiving groove; 13. Hand-adjusting bolt; 14. Fixing block; 15. Locking block; 16. Connecting shaft; 17. Limiting gear; 18. Insertion groove; 19. Insertion hole; 2 0. Connecting plate; 21. Inserting rod; 22. Tension spring; 23. Positioning component; 24. Protrusion; 25. Square block; 26. Rotating shaft; 27. Two-way screw; 28. Operating knob; 29. ​​Threaded tube; 30. Pin; 31. Return spring; 32. Connecting through hole; 33. Connecting post; 34. Electric telescopic rod; 35. Threaded sleeve; 36. Built-in detection tube; 37. Second standard light source; 38. Light intensity detection element. Detailed Implementation

[0027] To facilitate understanding of the present invention, a more comprehensive description will be given below with reference to the accompanying drawings. Typical embodiments of the present invention are shown in the drawings.

[0028] Example 1:

[0029] like Figure 1-7As shown, a photoelectric dust concentration detector for continuous dust concentration detection in fire and explosion protection applications according to the present invention includes: a base 1, a hollow column 2 fixedly mounted on the upper surface of the base 1, a support column 10 inserted into the hollow column 2, and a hinge seat 7 fixedly connected to the upper end of the support column 10; a support structure including a first mounting plate 3 and a third mounting plate 8 disposed above the support column 10, a receiving groove 12 formed on the front surface of the first mounting plate 3, a connecting shaft 16 rotatably connected to the inner side of the receiving groove 12, a second mounting plate 6 and a limiting gear 17 respectively sleeved on the outer side of the connecting shaft 16, a fixing block 14 fixedly mounted on the upper surface of the first mounting plate 3, a hand-adjusting bolt 13 screwed into the inside of the fixing block 14, a locking block 15 rotatably connected to one end of the hand-adjusting bolt 13 and engaging with the limiting gear 17, and an insertion groove 18 formed at one end of both the second mounting plate 6 and the third mounting plate 8. A plug-in plate 20 is inserted into the inside of the slot 18. Multiple insertion holes 19 are evenly opened on the upper surface of the plug-in plate 20. Tension springs 22 are fixedly installed at the bottom of the second mounting plate 6 and the third mounting plate 8. The lower end of the tension spring 22 is fixedly connected to a plug-in rod 21 that is inserted into the insertion hole 19. The small dust detection structure includes a threaded sleeve 35 installed and fixed inside the cavity column 2. An internal detection tube 36 that penetrates the base 1 is screwed into the inside of the threaded sleeve 35. A second standard light source 37 and a light intensity detection element 38 are fixedly installed on the inner side of the internal detection tube 36. A fixing structure is used to connect and fix the first mounting plate 3, the hinge seat 7 and the third mounting plate 8. A light source structure is installed and fixed on the upper surface of the first mounting plate 3 to provide illumination for detecting dust concentration. There are two light intensity detection structures, which are installed and fixed at one end of the plug-in plate 20 to detect the light intensity.

[0030] In practice, a light beam of a specific intensity is emitted by the first standard light source 5. After this beam passes through the environment to be tested, the emitted light intensity is detected by the light intensity detector 9 located on the right, and the reflected light intensity is detected by the light intensity detector 9 located in front. The dust concentration is then calculated by the calculation unit. The second mounting plate 6 is rotatably connected to the first mounting plate 3 by a connecting shaft 16, and is fixed by a hand-adjusting bolt 13, a fixing block 14, a locking block 15, and a limiting gear 17. This allows the light intensity detector 9, used to detect the reflected light intensity, to be rotated to different positions. Furthermore, by pulling down the insertion rod 21, the tension spring 22 is stretched, causing the upper end of the insertion rod 21 to disengage from the insertion hole 19. This allows the insertion plate 20 to be moved, adjusting the positions of the two light intensity detectors 9 and changing the distance between the light intensity detectors 9 and the first standard light source 5, thereby improving the adaptability of dust concentration detection and enhancing practicality. This small dust detection structure can be used to detect small environments to be tested. This invention addresses the shortcomings of existing technologies for detecting dust concentration, which involve sampling the environment at a specific time point or time period, returning to the laboratory to simulate the conditions of the sampling environment, and then conducting analysis. These methods suffer from low efficiency, discontinuity, non-online operation, and poor fit between the test results and the actual situation, severely weakening the effectiveness of dust explosion prevention and control and indirectly inducing various dust explosion accidents.

[0031] like Figure 6 As shown, an electric telescopic rod 34 is fixedly installed on the inner side of the cavity column 2. The upper end of the electric telescopic rod 34 is fixedly connected to the support column 10. By starting the electric telescopic rod 34, the support column 10 connected to its output end is raised and lowered, so as to conveniently adjust the height of the light intensity detector 9 and the first standard light source 5 as needed.

[0032] like Figure 1 and Figure 5 As shown, the light source structure includes a first standard light source 5 disposed above the first mounting plate 3. Each light intensity detection structure includes a light intensity detector 9. The light source structure also includes a first support 4 connected to the first mounting plate 3. The light intensity detection structure also includes a second support 11 connected to the plug-in plate 20. Both the second support 11 and the first support 4 have connecting through holes 32 on their outer sides. Both the first standard light source 5 and the light intensity detector 9 have connecting posts 33 fixedly installed on their outer sides, which are inserted into the connecting through holes 32. Both the second support 11 and the first support 4 have reset springs 31 fixedly installed on their upper surfaces. The upper end of the reset spring 31 is fixedly connected to a pin 30 communicating with the connecting through hole 32. The lower end of the pin 30 is inserted into the connecting post 33. The pin 30 has a T-shaped structure and is located inside the reset spring 31.

[0033] In practice, the first standard light source 5 and the first support 4, and the light intensity detector 9 and the second support 11 are connected by connecting through holes 32 and connecting posts 33. By pulling up the pin 30, the reset spring 31 is stretched, so that the lower end of the pin 30 is disengaged from the interior of the connecting post 33. This makes it easy to pull the connecting post 33 out of the interior of the connecting through hole 32, which facilitates the replacement of different types of first standard light sources 5. It also makes it easy to remove the first standard light source 5 and the light intensity detector 9 from the concentration detector for use in specific environments, thus improving the adaptability of use.

[0034] Example 2:

[0035] like Figure 1-7 As shown, based on Embodiment 1, the present invention provides a technical solution: the bracket structure further includes two rotating shafts 26 rotatably connected to the hinge seat 7. The left rotating shaft 26 is fixedly connected to the first mounting plate 3 on its outer side, and the right rotating shaft 26 is fixedly connected to the third mounting plate 8 on its outer side. The fixing structure also includes a square block 25 sleeved on the outer side of the rotating shaft 26. The front surface of the hinge seat 7 is symmetrically fixedly mounted with protrusions 24. The interior of the two protrusions 24 is rotatably connected to a bidirectional screw 27. The outer side of the bidirectional screw 27 is symmetrically screwed with threaded tubes 29. One end of each threaded tube 29 is rotatably connected to a positioning member 23 that engages with the square block 25. The fixing structure also includes an operating knob 28 sleeved on the outer side of the bidirectional screw 27. The operating knob 28 is located between the two protrusions 24. The rear surface of the positioning member 23 contacts the hinge seat 7, and the positioning member 23 has a U-shaped structure.

[0036] In practice, the first mounting plate 3, which houses the light source structure, and the third mounting plate 8, which houses the light intensity detection structure, are rotatably connected to the hinge seat 7 via a rotating shaft 26. By rotating the operating knob 28, the bidirectional screw 27 connected to it is rotated, thereby controlling the two threaded tubes 29 on the outside to move the positioning piece 23 away from the outside of the square block 25, thus releasing the fixation on the first mounting plate 3 and the third mounting plate 8. This allows the first mounting plate 3 and the third mounting plate 8 to be rotated downwards to a state parallel to the cavity column 2 and fixed, reducing the space occupied and making them easy to carry.

[0037] The first standard light source 5 used in this technical solution can be an LED, laser, halogen lamp, low-pressure mercury lamp, etc., or a radiation source, microwave source, or other source that emits electromagnetic waves or radiation. In use, first, hold the hollow column 2 and carry the dust concentration detector to the work area. Then, rotate the first mounting plate 3 and the third mounting plate 8 to a position parallel to the hinge seat 7, and rotate the operating knob 28 to drive the bidirectional screw 27 connected to it to rotate. This drives the two outer threaded tubes 29 to engage the positioning piece 23 on the outside of the square block 25, thus connecting and fixing the first mounting plate 3, the third mounting plate 8, and the hinge seat 7. Next, rotate the second mounting plate 6 to the required angle position with the first mounting plate 3, and rotate the hand-adjusting bolt 13 to engage the locking block 15 connected to it with the limiting gear 17, fixing the second mounting plate 6 at the required angle. Then, pull down the insertion rod 21 to stretch the tension spring 22, causing the upper end of the insertion rod 21 to disengage from the insertion hole 19. The movable plug-in plate 20 is used to adjust the positions of the two light intensity detectors 9, changing the distance between the light intensity detectors 9 and the first standard light source 5. Then, the elastic tension of the tension spring 22 is used again to insert the upper end of the plug-in rod 21 into the corresponding plug-in hole 19, thus fixing the light intensity detector 9 after the position is moved. Finally, the light intensity detector 9 and the first standard light source 5 are turned on, and the electric telescopic rod 34 is activated, driving the column 10 connected to its output end to move upward, adjusting the height of the light intensity detector 9 and the first standard light source 5. The first standard light source 5 emits light of a specific intensity. After this beam passes through the test environment, the emitted light intensity can be detected by the light intensity detector 9 located on the right, and the reflected light intensity can be detected by the light intensity detector 9 located in front. After calculation by the calculation component, the dust concentration is obtained. The built-in detection tube 36 is also equipped with a battery (not shown in the figure). When it is necessary to test a small test environment, the small dust detection structure is pulled out from the cavity column 2, so that the second standard light source 37 and the light intensity detection element 38 can detect the dust concentration. By pulling up the pin 30, the return spring 31 is stretched, causing the lower end of the pin 30 to disengage from the interior of the connecting post 33. This allows the connecting post 33 to be pulled out from the interior of the connecting through hole 32, enabling the replacement of different types of first standard light sources 5. It also facilitates the removal of the first standard light source 5 and the light intensity detector 9 from the concentration detector for use in specific large environments.

[0038] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A photoelectric dust concentration detector for continuous detection of dust concentration in fireproof and explosion-proof applications, characterized in that, include: A base (1) is provided, and a hollow column (2) is fixedly installed on the upper surface of the base (1). A support column (10) is inserted into the hollow column (2), and a hinge seat (7) is fixedly connected to the upper end of the support column (10). The support structure includes a first mounting plate (3) and a third mounting plate (8) disposed above the support column (10). The front surface of the first mounting plate (3) has a receiving groove (12). A connecting shaft (16) is rotatably connected to the inner side of the receiving groove (12). A second mounting plate (6) and a limiting gear (17) are respectively sleeved on the outer side of the connecting shaft (16). A fixing block (14) is fixedly mounted on the upper surface of the first mounting plate (3). A hand-adjusting bolt (13) is screwed into the inside of the fixing block (14). The hand-adjusting bolt (13)... One end is rotatably connected to a locking block (15) that engages with a limiting gear (17). One end of the second mounting plate (6) and the third mounting plate (8) is provided with a plug-in groove (18). A plug-in plate (20) is inserted into the inside of the plug-in groove (18). A plurality of plug-in holes (19) are evenly provided on the upper surface of the plug-in plate (20). A tension spring (22) is fixedly installed at the bottom of the second mounting plate (6) and the third mounting plate (8). A plug-in rod (21) that is inserted into the plug-in hole (19) is fixedly connected to the lower end of the tension spring (22). A small dust detection structure includes a threaded sleeve (35) installed and fixed inside the cavity column (2). The threaded sleeve (35) is screwed with an internal detection tube (36) that passes through the base (1). The internal detection tube (36) is fixedly installed with a second standard light source (37) and a light intensity detection element (38). A fixing structure is used to connect and fix the first mounting plate (3), the hinge seat (7) and the third mounting plate (8); The light source structure is installed and fixed on the upper surface of the first mounting plate (3) to provide illumination for detecting dust concentration; Two light intensity detection structures are provided and are installed and fixed at one end of the plug-in plate (20) for detecting light intensity.

2. The photoelectric dust concentration detector for continuous dust concentration detection in fireproof and explosion-proof applications according to claim 1, characterized in that, An electric telescopic rod (34) is fixedly installed on the inner side of the hollow column (2), and the upper end of the electric telescopic rod (34) is fixedly connected to the support column (10).

3. A photoelectric dust concentration detector for continuous dust concentration detection in fireproof and explosion-proof applications, as described in claim 1, characterized in that, The light source structure includes a first standard light source (5) disposed above the first mounting plate (3), and each light intensity detection structure includes a light intensity detector (9).

4. A photoelectric dust concentration detector for continuous dust concentration detection in fireproof and explosion-proof applications, as described in claim 3, is characterized in that... The light source structure also includes a first support (4) connected to the first mounting plate (3), and the light intensity detection structure also includes a second support (11) connected to the plug-in plate (20). Both the second support (11) and the first support (4) have connecting through holes (32) on their outer sides. Both the first standard light source (5) and the light intensity detector (9) have connecting posts (33) fixedly installed on their outer sides that are plugged into the connecting through holes (32).

5. A photoelectric dust concentration detector for continuous dust concentration detection in fireproof and explosion-proof applications according to claim 4, characterized in that, A return spring (31) is fixedly installed on the upper surface of both the second support (11) and the first support (4). The upper end of the return spring (31) is fixedly connected to a pin (30) that communicates with the connecting through hole (32). The lower end of the pin (30) is inserted into the connecting post (33).

6. A photoelectric dust concentration detector for continuous dust concentration detection in fireproof and explosion-proof applications, as described in claim 5, characterized in that, The pin (30) has a T-shaped structure and is located inside the return spring (31).

7. A photoelectric dust concentration detector for continuous dust concentration detection in fireproof and explosion-proof applications according to claim 1, characterized in that, The bracket structure also includes two rotating shafts (26) rotatably connected to the hinge seat (7). The rotating shaft (26) on the left side is fixedly connected to the first mounting plate (3) on the outside, and the rotating shaft (26) on the right side is fixedly connected to the third mounting plate (8) on the outside.

8. A photoelectric dust concentration detector for continuous dust concentration detection in fireproof and explosion-proof applications, as described in claim 7, characterized in that, The fixing structure also includes a square block (25) sleeved on the outside of the rotating shaft (26). The front surface of the hinge seat (7) is symmetrically fixed with protrusions (24). The interior of the two protrusions (24) is rotatably connected with a bidirectional screw (27). The outside of the bidirectional screw (27) is symmetrically screwed with threaded tubes (29). One end of each threaded tube (29) is rotatably connected with a positioning element (23) that engages with the square block (25).

9. A photoelectric dust concentration detector for continuous dust concentration detection in fireproof and explosion-proof applications, as described in claim 8, characterized in that, The fixing structure also includes an operating knob (28) sleeved on the outside of the bidirectional screw (27), the operating knob (28) being located between two protrusions (24).

10. A photoelectric dust concentration detector for continuous dust concentration detection in fireproof and explosion-proof applications according to claim 8, characterized in that, The rear surface of the positioning element (23) is in contact with the hinge seat (7), and the positioning element (23) has a U-shaped structure.

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