Online measuring instrument for inhalable dust content in atmosphere

Abstract

The invention relates to an online measuring instrument for the content of inhalable dust in atmosphere, and belongs to the technical field of dust measuring equipment. Comprising a fixing disc, an air inlet pipeline, an air outlet pipeline, a measuring electrode, a fixing ring, a rotating sleeve and a driving mechanism, wherein the air inlet pipeline and the air outlet pipeline are arranged on the fixing disc in a penetrating manner; the measuring electrode is arranged on the air outlet pipeline; the fixing ring is fixedly connected to the outer edge of the fixing disc; the two air cylinder assemblies are fixedly connected to the two opposite sides in the rotating sleeve, and the air inlet pipeline and the exhaust pipeline are parallel to each other and are arranged on the two opposite sides of the fixed disc correspondingly; the air cylinder assembly comprises a cylinder body and a piston plate located in the cylinder body, the piston plate and the outer wall of the cylinder body are arranged in a spaced mode, a plurality of first turbulent flow blades extending spirally are arranged on the inner wall of the cylinder body, and a plurality of second turbulent flow blades are arranged on the outer edge of the piston plate. According to the invention, the problem of inaccurate measurement data when the dust concentration is low in the prior art is solved.

Description

Technical Field

[0001] The invention relates to an online measuring instrument for the content of inhalable dust in the atmosphere, belonging to the technical field of dust measuring equipment. Background Art

[0002] At present, dust content measurement sensors are usually installed on conveying pipes or flues, and there are two main measurement technologies. One is the optical measurement method, in which the sensor emits a laser beam, irradiates it on the dust-laden gas, and estimates the dust concentration in the gas by the intensity of the laser after transmission or backscattering. The other technology is based on the electrostatic charge method to measure the dust concentration. Dust rubs against each other during movement, generating static charges and thus forming an electrostatic field. The size of the electric field is proportional to the size of the dust concentration. The sensor probe is inserted into the dust-laden gas to sense and measure the size of the electrostatic field, and the dust concentration in the dust-laden gas can be calculated in real time. However, the current charge-induction dust concentration measurement device still exposes an important defect in use. That is, when the dust concentration is low, since the dust charge is very weak, the induction signal of the charged particle induction ring installed on the test tube is also very weak, the measurement accuracy is reduced, and the instability is high, resulting in large errors in the measurement of dust concentration, inability to effectively warn, and a high rate of missed detection of dangerous concentrations. Therefore, research and development of dust concentration measurement devices and methods with high timeliness and accuracy are of great significance to the prediction of dust explosions, production safety, and the safety of human life and property.

[0003] Therefore, a new solution needs to be proposed to solve this problem. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an online measuring instrument for the content of inhalable dust in the atmosphere, which solves the problem in the prior art that when the dust concentration is low, the measurement data is inaccurate.

[0005] The technical problem to be solved by the present invention is achieved by adopting the following technical solutions: An online measuring instrument for the content of inhalable dust in the atmosphere, comprising a fixed disk, an air intake duct and an exhaust duct passing through the fixed disk, a measuring electrode arranged on the exhaust duct, a fixed ring fixedly connected to the outer edge of the fixed disk, a rotating sleeve rotatably connected to the inner side of the fixed ring, a driving mechanism for driving the rotating sleeve to rotate, and two groups of cylinder assemblies fixedly connected to opposite sides of the rotating sleeve, wherein the air intake duct and the exhaust duct are parallel to each other and are respectively arranged on opposite sides of the fixed disk; The cylinder assembly includes a cylinder body, a piston plate located in the cylinder body and spaced apart from the outer wall of the cylinder body, and a piston member for driving the piston plate to move. The two cylinder bodies correspond to an intake pipe and an exhaust pipe respectively. A plurality of first spoiler blades extending spirally are provided on the inner wall of the cylinder body. A plurality of second spoiler blades cooperating with the plurality of first spoiler blades are provided at the outer edge of the piston plate. The second spoiler blades are inserted between the first spoiler blades. The inner edge of the first spoiler blade is attached to the outer wall of the piston plate, and the outer edge of the second spoiler blade is attached to the inner wall of the cylinder body.

[0006] The present invention is further configured as follows: a spoiler impeller is fixedly connected to the end surface of the piston plate close to the fixed disk, and the rotation direction of the blades of the spoiler impeller is opposite to the rotation direction of the second spoiler blades.

[0007] The present invention is further configured as follows: a rotating ring groove extending circumferentially therein is provided inside the side wall of the cylinder body, a first sliding groove extending axially therein and connected to the inside thereof is provided on the side wall of the cylinder body, a sealing ring is rotatably connected inside the rotating ring groove, a second sliding groove extending spirally therein is provided on the sealing ring, the length of the second sliding groove in the circumferential direction of the sealing ring does not exceed one circle, a sliding seal is provided in the first sliding groove, and the sliding seal includes two first sliding blocks slidably connected to the first sliding groove and respectively located on the inner and outer sides of the sealing ring, a second sliding block slidably connected to the second sliding groove and respectively fixedly connected to the first sliding blocks on both sides, a support rod extending into the cylinder body is fixedly connected to the first sliding block located on the inner side, and a support shaft rotatably connected to the support rod is fixedly connected to the end face of the piston plate away from the fixed disk.

[0008] The present invention is further configured as follows: the piston member includes a driving rod fixedly connected to the outer wall of the sliding seal, a driving groove opened in the driving rod and extending along the length direction of the driving rod, an arc rod with an arc greater than 90° and less than 100° is provided in the rotating sleeve, driving columns are fixedly connected to both ends of the arc rod respectively, and the driving columns at both ends are respectively slidably connected to the driving grooves of the driving rod on both sides, and a counterweight block is fixedly connected to the middle part of the arc rod. When the rotating sleeve drives the two groups of the cylinder assemblies to rotate to the upper and lower sides, the counterweight block drives the sliding seal on the cylinder assembly on the lower side to move in a direction away from the fixed disk, and drives the sliding seal on the cylinder assembly on the upper side to move in a direction close to the fixed disk.

[0009] The present invention is further configured as follows: a U-shaped tube is also provided in the rotating sleeve, and the U-shaped tube includes two straight cylindrical parts and a U-shaped part, the two straight cylindrical parts are respectively located on two opposite sides of the rotating sleeve and are alternately arranged between the two cylinder bodies, the U-shaped part is arranged on a side of the rotating sleeve away from the fixed disk and the two ends are respectively connected to the two straight cylindrical parts, and when the rotating sleeve rotates, the two cylinder bodies or the two straight cylindrical parts correspond to the intake pipe and the exhaust pipe.

[0010] The present invention is further configured as follows: a rotating disk is rotatably connected to a position in the rotating sleeve close to the fixed disk, a locking piece is provided between the rotating disk and the rotating sleeve, the rotating disk is located between the cylinder body and the intake pipe, and the end face of the cylinder body is attached to one side face of the rotating disk, the end faces of the intake pipe and the exhaust pipe are attached to the other side face of the rotating disk, and two air vents are provided on the rotating disk, and the two air vents rotate correspondingly to the intake pipe and the exhaust pipe.

[0011] The present invention is further configured as follows: the locking member includes a movable groove opened on the peripheral wall of the rotating sleeve, an adjusting screw fixedly connected to the peripheral wall of the rotating disk and slidably connected in the movable groove, and a locking bolt threadedly connected to the adjusting screw, and the arc of the movable groove is 90°.

[0012] The present invention is further configured as follows: the driving mechanism comprises a rotating shaft coaxially fixedly connected to the rotating disk and passing through the fixed disk, an incomplete gear fixedly connected to the end of the rotating shaft, a semicircular plate fixedly connected to the end face of the incomplete gear, a driving gear rotatably connected to the fixed disk and meshing with the incomplete gear, a limiting plate coaxially fixedly connected to the end face of the driving gear and interlocked with the semicircular plate, a worm coaxially fixedly connected to the driving gear, a worm rotatably supported on the fixed disk through a shaft seat and meshing with the worm wheel, and a driving motor connected to one end of the worm; The incomplete gear is a quarter incomplete gear, the arc of the semicircular plate is 270° and is staggered with the teeth of the incomplete gear, four limit plates are provided and are evenly distributed around the axis of the driving gear, and the end of the limit plate away from the center of the driving gear is arranged in a groove shape that matches the outer edge of the semicircular plate.

[0013] The beneficial effects of the present invention are: 1. By respectively arranging relative intake ducts and exhaust ducts on the fixed disk, and arranging a rotating sleeve to drive the two groups of cylinder assemblies to rotate, the two groups of cylinder assemblies can correspond to the intake duct and the exhaust duct respectively during the rotation process, and with the cooperation of the piston member, when the cylinder assembly rotates to the upper side, driven by the arc rod and the counterweight block, the top end of the arc rod swings in a direction away from the fixed disk, so that the gas sample in the intake duct is sucked into the cylinder body by the piston plate, and in the process of the gas entering the cylinder body, it rotates through the first spoiler blade, so that the dust particles in the air collide violently, and the charge of the dust is increased. When the cylinder assembly rotates to the lower side, under the action of the arc rod and the counterweight block, the bottom end of the arc rod pushes the sliding seal to move in a direction close to the fixed disk, and the gas in the cylinder body is pushed into the exhaust duct through the piston plate, and collides again when passing through the first spoiler blade, so that the measuring electrode in the exhaust duct can accurately measure the dust content in the gas; 2. By further arranging a spoiler impeller on the piston plate, when the airflow enters the cylinder body under the action of the piston plate, the airflow passing through the cylinder body rotates under the action of the first spoiler blade, and the airflow at the center of the cylinder body rotates in the opposite direction toward the outside under the action of the spoiler impeller, so that the relative speed between the inner and outer laminar flows is higher, thereby increasing the degree of dust collision and achieving better effects; 3. By setting a U-shaped tube in the rotating sleeve, when the dust concentration is high, the rotating sleeve is rotated 90 degrees so that the two straight parts of the U-shaped tube correspond to the intake duct and the exhaust duct respectively, so that the intake duct and the exhaust duct are directly connected, and the measuring electrode can directly measure; 4. By arranging a rotating disk between the rotating sleeve and the air intake pipe, when it is necessary to enhance the collision of the airflow, the rotating disk is rotated so that the two vents correspond to the open ends of the two cylinders respectively, thereby closing the U-shaped tube and reducing the air leakage of the rotating sleeve during the rotation process. When it is not necessary to enhance the collision of the airflow, the rotating disk is rotated so that the two vents correspond to the two straight parts of the U-shaped tube respectively, thereby closing the two cylinder assemblies and reducing the airflow entering the cylinder when the rotating sleeve rotates; 5. An intermittent mechanism is provided on the fixed disk to drive the rotating disk to drive the rotating sleeve to rotate, so that the vent holes on the rotating disk can be more accurately aligned with the intake pipe and the exhaust pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0015] Figure 2 It is an overall cross-sectional view of the present invention.

[0016] Figure 3 yes Figure 2A partial enlarged view of part A.

[0017] Figure 4 It is a structural schematic diagram of the piston plate part in the present invention.

[0018] Figure 5 It is a structural schematic diagram of the cylinder part in the present invention.

[0019] Figure 6 yes Figure 5 A partial enlarged view of part B.

[0020] Figure 7 yes Figure 1 A partial enlarged view of part C.

[0021] Figure 8 It is a schematic diagram of the overall structure of the present invention.

[0022] Fig. 9 yes Figure 8 A partial enlarged view of part D.

[0023] In the figure: 1, fixed plate; 2, intake pipe; 3, exhaust pipe; 4, measuring electrode; 5, fixed ring; 6, rotating sleeve; 7, cylinder assembly; 8, cylinder body; 9, piston plate; 10, piston member; 11, first spoiler blade; 12, second spoiler blade; 13, spoiler impeller; 14, rotating ring groove; 15, first sliding groove; 16, sealing ring; 17, second sliding groove; 18, sliding seal; 19, first sliding block; 20, second sliding block; 21, support rod; 22, support shaft; 23. Driving rod; 24. Driving groove; 25. Arc rod; 26. Driving column; 27. Counterweight; 28. U-shaped tube; 29. ​​Straight tube; 30. U-shaped part; 31. Rotating disk; 32. Vent; 33. Locking piece; 34. Moving groove; 35. Adjusting screw; 36. Locking bolt; 37. Driving mechanism; 38. Rotating shaft; 39. Incomplete gear; 40. Semicircular plate; 41. Driving gear; 42. Limiting plate; 43. Worm wheel; 44. Worm; 45. Driving motor. DETAILED DESCRIPTION

[0024] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention is further described below with reference to specific illustrations.

[0025] like Figure 1-Figure 9 As shown, the online measuring instrument for the inhalable dust content in the atmosphere comprises a fixed disk 1, an air intake duct 2 and an exhaust duct 3 penetrating the fixed disk 1, and a measuring electrode 4 arranged in the exhaust duct 3, wherein the air intake duct 2 and the exhaust duct 3 are parallel to each other and are respectively arranged on two opposite sides of the fixed disk 1, a fixed ring 5 is fixedly connected to the outer edge of the fixed disk 1, and a rotating sleeve 6 is rotatably connected to the inner side of the fixed ring 5.

[0026] Two groups of cylinder assemblies 7 are fixedly connected on opposite sides of the rotating sleeve 6. The cylinder assembly 7 includes a cylinder body 8, a piston plate 9 located in the cylinder body 8 and spaced apart from the outer wall of the cylinder body 8, and a piston member 10 for driving the piston plate 9 to move. The two cylinder bodies 8 correspond to the intake pipe 2 and the exhaust pipe 3 respectively. The inner wall of the cylinder body 8 is provided with a plurality of spirally extending first spoiler blades 11, and the outer edge of the piston plate 9 is provided with a plurality of second spoiler blades 12 matched with the plurality of first spoiler blades 11. The second spoiler blades 12 are inserted between the first spoiler blades 11, and the inner edge of the first spoiler blade 11 is attached to the outer wall of the piston plate 9, and the outer edge of the second spoiler blade 12 is attached to the inner wall of the cylinder body 8. A sealed piston structure is formed between the first spoiler blade 11 and the second spoiler blade 12, and the second spoiler blade 12 can be driven to rotate under the action of the spiral of the first spoiler blade 11.

[0027] In order to further improve the collision effect and efficiency of dust in the airflow, a spoiler impeller 13 is fixedly connected to the end surface of the piston plate 9 close to the fixed plate 1, and the rotation direction of the blades of the spoiler impeller 13 is opposite to the rotation direction of the second spoiler blade 12. By further arranging the spoiler impeller 13 on the piston plate 9, when the airflow enters the cylinder body 8 under the action of the piston plate 9, the airflow passing through the cylinder body 8 rotates under the action of the first spoiler blade 11, and the airflow at the center of the cylinder body 8 rotates in the opposite direction toward the outside under the action of the spoiler impeller 13, so that the relative speed between the inner and outer laminar flows is higher, so that the dust collision degree is higher and the effect is better.

[0028] To ensure the sealing of the cylinder body 8, a rotating annular groove 14 extending circumferentially is provided inside the side wall of the cylinder body 8, and a first sliding groove 15 extending axially and connected to the inside of the cylinder body 8 is provided on the side wall of the cylinder body 8. A sealing ring 16 is rotatably connected in the rotating annular groove 14, and a second sliding groove 17 extending spirally around the sealing ring 16 is provided on the sealing ring 16. The length of the second sliding groove 17 in the circumferential direction of the sealing ring 16 does not exceed one circle. A sliding seal 18 is provided in the first sliding groove 15, and the sliding seal 18 includes two first sliding blocks 19 slidably connected to the first sliding groove 15 and respectively located at the inner and outer sides of the sealing ring 16, and a second sliding block 20 slidably connected to the second sliding groove 17 and respectively fixedly connected to the first sliding blocks 19 on both sides; a support rod 21 extending into the cylinder body 8 is fixedly connected to the first sliding block 19 located on the inner side, and a support shaft 22 rotatably connected to the support rod 21 is fixedly connected to the end surface of the piston plate 9 away from the fixed disk 1

[0029] The piston member 10 includes a driving rod 23 fixedly connected to the outer wall of the sliding seal 18, a driving groove 24 opened in the driving rod 23 and extending along the length direction thereof, an arc rod 25 with an arc greater than 90° and less than 100° is provided in the rotating sleeve 6, driving columns 26 are fixedly connected at both ends of the arc rod 25, and the driving columns 26 at both ends are respectively slidably connected to the driving grooves 24 of the driving rods 23 on both sides, and a counterweight block 27 is fixedly connected to the middle part of the arc rod 25. When the rotating sleeve 6 drives the two groups of cylinder assemblies 7 to rotate to the upper and lower sides, the counterweight block 27 drives the sliding seal 18 on the cylinder assembly 7 on the lower side to move in a direction away from the fixed disk 1, and drives the sliding seal 18 on the cylinder assembly 7 on the upper side to move in a direction close to the fixed disk 1.

[0030] In order to improve the application scope of the device, a U-shaped tube 28 is further provided in the rotating sleeve 6. The U-shaped tube 28 includes two straight tube parts 29 and a U-shaped part 30. The two straight tube parts 29 are respectively located on opposite sides of the rotating sleeve 6 and are alternately arranged between the two cylinder bodies 8. The U-shaped part 30 is arranged on the side of the rotating sleeve 6 away from the fixed plate 1 and the two ends are respectively connected to the two straight tube parts 29. When the rotating sleeve 6 rotates, the two cylinder bodies 8 or the two straight tube parts 29 correspond to the intake pipe 2 and the exhaust pipe 3. By arranging the U-shaped tube 28 in the rotating sleeve 6, when the dust concentration is high, the rotating sleeve 6 is rotated 90 degrees, so that the two straight tube parts 29 of the U-shaped tube 28 correspond to the intake pipe 2 and the exhaust pipe 3 respectively, so that the intake pipe 2 and the exhaust pipe 3 are directly connected, and the measuring electrode 4 can directly measure.

[0031] A rotating disk 31 is rotatably connected to the position of the rotating sleeve 6 near the fixed disk 1. The rotating disk 31 is located between the cylinder body 8 and the intake pipe 2, and the end face of the cylinder body 8 is attached to one side of the rotating disk 31, and the end faces of the intake pipe 2 and the exhaust pipe 3 are attached to the other side of the rotating disk 31. Two vents 32 are provided on the rotating disk 31, and the two vents 32 rotate to correspond to the intake pipe 2 and the exhaust pipe 3. A locking member 33 is provided between the rotating disk 31 and the rotating sleeve 6, and the locking member 33 includes a moving groove 34 provided on the peripheral wall of the rotating sleeve 6, an adjusting screw 35 fixedly connected to the peripheral wall of the rotating disk 31 and slidably connected to the moving groove 34, and a locking bolt 36 threadedly connected to the adjusting screw 35, and the arc of the moving groove 34 is 90°.

[0032] By setting a rotating disk 31 between the rotating sleeve 6 and the air intake pipe 2, when it is necessary to enhance the collision of the airflow, by rotating the rotating disk 31, the two air holes 32 correspond to the open ends of the two cylinder bodies 8 respectively, thereby closing the U-shaped tube 28 and reducing the leakage of the rotating sleeve 6 during the rotation process. When it is not necessary to enhance the collision of the airflow, by rotating the rotating disk 31, the two air holes 32 correspond to the two straight tube parts 29 of the U-shaped tube 28 respectively, thereby closing the two cylinder assemblies 7, so that when the rotating sleeve 6 rotates, the airflow entering the cylinder body 8 is reduced.

[0033] A driving mechanism 37 for driving the rotating sleeve 6 to rotate is provided on the fixed disk 1. The driving mechanism 37 includes a rotating shaft 38 coaxially fixedly connected to the rotating disk 31 and passing through the fixed disk 1, an incomplete gear 39 fixedly connected to the end of the rotating shaft 38, a semicircular plate 40 fixedly connected to the end face of the incomplete gear 39, a driving gear 41 rotatably connected to the fixed disk 1 and meshing with the incomplete gear 39, a limiting plate 42 coaxially fixedly connected to the end face of the driving gear 41 and the semicircular plate 40, a worm gear 43 coaxially fixedly connected to the driving gear 41, a worm 44 rotatably supported on the fixed disk 1 through an axle seat and meshing with the worm gear 43, and a driving motor 45 connected to one end of the worm gear 44.

[0034] Among them, the incomplete gear 39 is a quarter of the incomplete gear 39, the arc of the semicircular plate 40 is 270° and is staggered with the teeth of the incomplete gear 39, four limit plates 42 are provided and are evenly distributed around the axis of the driving gear 41, and one end of the limit plate 42 away from the center of the driving gear 41 is set in a groove shape that matches the outer edge of the semicircular plate 40. An intermittent mechanism is set on the fixed plate 1 to drive the rotating plate 31 to drive the rotating sleeve 6 to rotate, so that the vent holes 32 on the rotating plate 31 are more accurately aligned with the intake pipe 2 and the exhaust pipe 3.

[0035] The implementation principle of the present invention is: By respectively arranging the air intake pipe 2 and the exhaust pipe 3 opposite to each other on the fixed plate 1, and arranging the rotating sleeve 6 to drive the two groups of cylinder assemblies 7 to rotate, the two groups of cylinder assemblies 7 can respectively correspond to the air intake pipe 2 and the exhaust pipe 3 during the rotation process, and with the cooperation of the piston member 10, when the cylinder assembly 7 rotates to the upper side, driven by the arc rod 25 and the counterweight block 27, the top end of the arc rod 25 swings in the direction away from the fixed plate 1, so that the gas sample in the air intake pipe 2 is sucked into the cylinder body 8 by the piston plate 9, and when the gas enters the cylinder body 8 During the internal process, the first spoiler blade 11 rotates, causing the dust particles inside the air to collide violently, increasing the charge of the dust. When the cylinder assembly 7 rotates to the bottom, under the action of the arc rod 25 and the counterweight block 27, the bottom end of the arc rod 25 pushes the sliding seal 18 to move toward the fixed disk 1, and pushes the gas in the cylinder body 8 into the exhaust pipe 3 through the piston plate 9, and collides again when passing through the first spoiler blade 11, so that the measuring electrode 4 in the exhaust pipe 3 can accurately measure the dust content in the gas.

[0036] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. Online measuring instrument for inhalable dust content in the atmosphere, characterized by: It comprises a fixed disk (1), an air intake duct (2) and an air exhaust duct (3) passing through the fixed disk (1), a measuring electrode (4) arranged on the air exhaust duct (3), a fixed ring (5) fixedly connected to the outer edge of the fixed disk (1), a rotating sleeve (6) rotatably connected to the inner side of the fixed ring (5), a driving mechanism (37) for driving the rotating sleeve (6) to rotate, and two groups of cylinder assemblies (7) fixedly connected to opposite sides of the rotating sleeve (6), wherein the air intake duct (2) and the air exhaust duct (3) are parallel to each other and are respectively arranged on opposite sides of the fixed disk (1); The cylinder assembly (7) comprises a cylinder body (8), a piston plate (9) located in the cylinder body (8) and spaced apart from the outer wall of the cylinder body (8), and a piston member (10) for driving the piston plate (9) to move. The two cylinder bodies (8) correspond to the intake pipe (2) and the exhaust pipe (3) respectively. The inner wall of the cylinder body (8) is provided with a plurality of first spoiler blades (11) extending spirally. The outer edge of the piston plate (9) is provided with a plurality of second spoiler blades (12) matched with the plurality of first spoiler blades (11). The second spoiler blades (12) are inserted between the first spoiler blades (11). The inner edge of the first spoiler blade (11) is in contact with the outer wall of the piston plate (9), and the outer edge of the second spoiler blade (12) is in contact with the inner wall of the cylinder body (8).

2. The on-line measuring instrument for inhalable dust content in the atmosphere according to claim 1, characterized in that: A spoiler impeller (13) is fixedly connected to the end surface of the piston plate (9) close to the fixed disk (1), and the rotation direction of the blades of the spoiler impeller (13) is opposite to the rotation direction of the second spoiler blades (12).

3. The on-line measuring instrument for inhalable dust content in the atmosphere according to claim 2, characterized in that: The cylinder body (8) has a rotating annular groove (14) extending in a circumferential direction therein, and the cylinder body (8) has a first sliding groove (15) extending in an axial direction therein and communicating with the inside thereof. A sealing ring (16) is rotatably connected in the rotating annular groove (14). The sealing ring (16) has a second sliding groove (17) extending in a spiral direction therein. The length of the second sliding groove (17) in the circumferential direction of the sealing ring (16) does not exceed one circle. A sliding seal (18) is provided in the first sliding groove (15). The sliding seal (18) is provided in the first sliding groove (15). 8) comprises two first sliding blocks (19) slidably connected to the first sliding groove (15) and respectively located on the inner and outer sides of the sealing ring (16), and a second sliding block (20) slidably connected to the second sliding groove (17) and respectively fixedly connected to the first sliding blocks (19) on both sides, the first sliding block (19) located on the inner side is fixedly connected to a support rod (21) extending into the cylinder body (8), and the end surface of the piston plate (9) away from the fixed disk (1) is fixedly connected to a support shaft (22) rotatably connected to the support rod (21).

4. The on-line measuring instrument for inhalable dust content in the atmosphere according to claim 3 is characterized in that: The piston member (10) comprises a driving rod (23) fixedly connected to the outer wall of the sliding seal (18), and a driving groove (24) provided in the driving rod (23) and extending along the length direction thereof. An arc rod (25) having an arc angle greater than 90° and less than 100° is arranged in the rotating sleeve (6). Driving columns (26) are fixedly connected to both ends of the arc rod (25). The driving columns (26) at both ends are respectively slidably connected to the driving grooves (24) of the driving rod (23) at both sides. A counterweight (27) is fixedly connected to the middle of the arc rod (25). When the rotating sleeve (6) drives the two groups of the cylinder assemblies (7) to rotate to the upper and lower sides, the counterweight (27) drives the sliding seal (18) on the cylinder assembly (7) on the lower side to move in a direction away from the fixed disk (1), and drives the sliding seal (18) on the cylinder assembly (7) on the upper side to move in a direction close to the fixed disk (1).

5. The on-line measuring instrument for inhalable dust content in the atmosphere according to claim 4, characterized in that: A U-shaped tube (28) is also provided in the rotating sleeve (6), and the U-shaped tube (28) includes two straight tube portions (29) and a U-shaped portion (30). The two straight tube portions (29) are respectively located on two opposite sides of the rotating sleeve (6) and are alternately arranged between the two cylinder bodies (8). The U-shaped portion (30) is arranged on a side of the rotating sleeve (6) away from the fixed plate (1) and has two ends respectively connected to the two straight tube portions (29). When the rotating sleeve (6) rotates, the two cylinder bodies (8) or the two straight tube portions (29) correspond to the intake pipe (2) and the exhaust pipe (3).

6. The on-line measuring instrument for inhalable dust content in the atmosphere according to claim 5, characterized in that: A rotating disk (31) is rotatably connected to a position of the rotating sleeve (6) near the fixed disk (1), a locking member (33) is provided between the rotating disk (31) and the rotating sleeve (6), the rotating disk (31) is located between the cylinder body (8) and the intake pipe (2), and the end face of the cylinder body (8) is attached to one side of the rotating disk (31), and the end faces of the intake pipe (2) and the exhaust pipe (3) are attached to the other side of the rotating disk (31), and two ventilation holes (32) are provided on the rotating disk (31), and the two ventilation holes (32) rotate corresponding to the intake pipe (2) and the exhaust pipe (3).

7. The on-line measuring instrument for inhalable dust content in the atmosphere according to claim 6, characterized in that: The locking member (33) comprises a movable groove (34) formed on the peripheral wall of the rotating sleeve (6), an adjusting screw (35) fixedly connected to the peripheral wall of the rotating disk (31) and slidably connected to the movable groove (34), and a locking bolt (36) threadedly connected to the adjusting screw (35); the arc of the movable groove (34) is 90°.

8. The on-line measuring instrument for inhalable dust content in the atmosphere according to claim 6, characterized in that: The driving mechanism (37) comprises a rotating shaft (38) coaxially fixedly connected to the rotating disk (31) and passing through the fixed disk (1), an incomplete gear (39) fixedly connected to the end of the rotating shaft (38), a semicircular plate (40) fixedly connected to the end surface of the incomplete gear (39), a driving gear (41) rotatably connected to the fixed disk (1) and meshing with the incomplete gear (39), a limiting plate (42) coaxially fixedly connected to the end surface of the driving gear (41) and interlocked with the semicircular plate (40), a worm gear (43) coaxially fixedly connected to the driving gear (41), a worm (44) rotatably supported on the fixed disk (1) through a shaft seat and meshing with the worm gear (43), and a driving motor (45) connected to one end of the worm gear (44); The incomplete gear (39) is a quarter of the incomplete gear (39); the arc of the semicircular plate (40) is 270° and is arranged in a staggered manner with the teeth of the incomplete gear (39); four limit plates (42) are provided and are evenly distributed around the axis of the driving gear (41); one end of the limit plate (42) away from the center of the driving gear (41) is arranged in a groove shape that matches the outer edge of the semicircular plate (40).

Images