Flying dust detection device for building construction

Abstract

The invention discloses a flying dust detection device for building construction, and relates to the technical field of air detection devices, the flying dust detection device comprises an installation support, a display screen and a machine body are installed on the installation support, a wind indicator is installed on the machine body, a wind direction sensor is installed on the wind indicator, the flying dust detection device further comprises a sampling head, and the sampling head is installed at the top of the machine body; the output end of the circulation assembly is connected with the input end of the sampling head, and the input end of the circulation assembly is communicated with a mounting shell with an opening in the bottom; and a screening assembly. By arranging the screening assembly, a supporting component works to expose a pressure sensor, when the screening plate blocking degree exceeds a threshold value, the pressure sensor sends out a piezoelectric signal, a stretching component pulls up and loosens the screening plate, meanwhile, the supporting component continuously pushes an arc-shaped block upwards, and therefore under the self-weight effect of a spring and the screening plate, the screening plate is separated from the arc-shaped block. The sieve plate is collided and impacted with the arc-shaped blocks for multiple times, so that the sieve plate is quickly cleaned.

Description

Technical Field

[0001] The invention relates to the technical field of air detection devices, and in particular to a dust detection device for building construction. Background Art

[0002] The dust detection device is mainly used to detect the concentration of PM2.5 and PM10 at the construction site. It usually inhales external air through a sampling head, separates the particles in the air through the sampling head, and sends the particles that meet the requirements into the detection structure for detection. The dust detection device used in construction is used because the environment at the construction site is relatively complex. Large particles such as sand are easily generated during earthwork and mechanical operations. In windy weather, these large particles will move with the dust. If these large particles enter the sampling head or the detection structure, it will not only easily block the sampling head, but also easily wear the internal structure of the device, causing the device to be unable to be used normally.

[0003] In the prior art, a filter structure composed of a coarse filter and a fine filter is used to filter tiny particles in the air, effectively preventing the particles from damaging the vacuum pump. In this method, large particles in the sampled air are not filtered, which can easily clog the detection structure for large particles to damage it. A cloth bag is used to filter the air, and after filtering, the drawstring at the bottom of the bag is untied to quickly dump out the dust. In this method, the dust is easy to adhere to the inner wall of the bag, affecting the dust removal effect of the bag and the dumping and cleaning effect. A pressure sensor is used to display the weight of the filter in real time. When the change exceeds the set value, the controller controls the vibration device to vibrate, so that the solid particles blocked in the filter fall off. In this method, an additional vibration device needs to be set to vibrate the filter, and when the filter vibrates, it is easy to continuously impact the pressure sensor, damaging the pressure sensor and affecting its operation. Summary of the invention

[0004] The purpose of the present invention is to solve the problem in the prior art that an additional vibration device is required to vibrate the filter screen, and the vibration of the filter screen is prone to continuously impact the pressure sensor, damaging the pressure sensor and affecting its operation, and to propose a dust detection device for construction.

[0005] In order to achieve the above object, the present invention adopts the following technical scheme: a dust detection device for construction, comprising a mounting bracket, a display screen and a body are mounted on the mounting bracket, a wind vane is mounted on the body, a wind direction sensor is mounted on the wind vane, and further comprising:

[0006] A sampling head, which is mounted on the top of the machine body;

[0007] A circulation component, wherein the output end of the circulation component is connected to the input end of the sampling head, and the input end is connected to a mounting shell having a bottom opening;

[0008] The screening assembly comprises a sieve plate, the sieve plate being slidably connected in the mounting shell, the top of the sieve plate being fixedly connected with two elastic components, the top of the elastic component being fixedly connected to the inner wall of the mounting shell, the top of the mounting shell being connected with a stretching component, the output end of the stretching component being connected to the sieve plate, the stretching component being used to pull the sieve plate to move upward, the bottom of the mounting shell being connected with two supporting components, the two supporting components corresponding to the two elastic components one by one, the supporting components comprising a mounting block and a supporting block fixedly connected to the inner wall of the mounting shell, a pressure sensor being installed on the top of the mounting block, a second electric telescopic rod being installed on the support block, the output end of the second electric telescopic rod being fixedly connected with a mounting disk, two arc blocks being fixedly connected to the top of the mounting disk, the tops of the two arc blocks passing through the mounting block and resting against the bottom of the sieve plate, the stretching component, the pressure sensor and the second electric telescopic rod are all electrically connected with a controller, and the controller is installed on the machine body.

[0009] In the above-mentioned dust detection device for construction, a plurality of connecting rods are fixedly connected to the bottom of the mounting shell, a same protrusion is fixedly connected to the bottom ends of the plurality of connecting rods, the protrusion is fixedly connected to the top of the body, and the top of the protrusion is arc-shaped.

[0010] In the above-mentioned dust detection device for construction, the circulation component includes a containing shell, the sampling head input end is connected to the inside of the containing shell, the bottom of the containing shell is connected to an air outlet pipe, and the top is connected to a first elbow, a fan is installed at one end of the first elbow away from the containing shell, the fan input end is connected to a second elbow, and the second elbow is connected to the top of the installation shell at one end away from the fan.

[0011] In the above-mentioned dust detection device for construction, the outlet pipe is connected to a guide shell at one end away from the accommodating shell, and a first cavity and a second cavity are arranged in the guide shell. The air inlet end of the first cavity is connected to the outlet pipe, and the air outlet end is connected to a plurality of flow holes, and the plurality of flow holes are connected to the second cavity at one end away from the first cavity. The cross-sectional size of the second cavity gradually increases from the air inlet end to the air outlet end, and the output direction of the air outlet end of the second cavity points to the protrusion.

[0012] In the above-mentioned dust detection device for construction, a blow-off assembly is connected to the installation shell, and the blow-off assembly includes an annular tube, which is fixedly connected to the installation shell, and two groups of air outlet holes are opened on the annular tube. The input ends of the two groups of air outlet holes are connected to the inside of the annular tube, and the output ends point to the tops of the two installation blocks one by one. A connecting pipe is connected to one side of the annular tube, and the connecting pipe is sealed at one end away from the annular tube and passes through the installation shell and the first bend pipe, and is connected to an air intake shell, and the air intake shell is open at one end away from the first bend pipe, and the opening direction points to the output end of the fan.

[0013] In the above-mentioned dust detection device for construction, the elastic component includes a fixing plate, which is fixedly connected to the inner wall of the mounting shell, a spring is fixedly connected to the bottom of the fixing plate, a connecting plate is fixedly connected to the bottom end of the spring, and the bottom of the connecting plate is fixedly connected to the top edge of the screen plate.

[0014] In the above-mentioned dust detection device for construction, the top end of the arc block is initially located at the bottom of the sieve plate in a naturally stretched state of the spring.

[0015] In the above-mentioned dust detection device for construction, the stretching component includes a fixed frame, which is fixedly connected to the top of the installation shell, and a first electric telescopic rod is installed on the fixed frame. An electromagnet is installed at the output end of the first electric telescopic rod. An iron block is fixedly connected to the sieve plate, and the bottom of the electromagnet is arranged opposite to the iron block. When the electromagnet is energized, it magnetically attracts the iron block.

[0016] In the above-mentioned dust detection device for construction, a protective shell is fixedly connected to the support block, and the protective shell is sleeved on the outer surface of the second electric telescopic rod.

[0017] In the above-mentioned dust detection device for construction, when the controller is working, it controls the output end of the second electric telescopic rod to contract so that the top of the arc block moves below the pressure sensor, and receives the piezoelectric signal of the pressure sensor to control the working state of the first electric telescopic rod and the electromagnet.

[0018] Compared with the prior art, the advantages of the present invention are:

[0019] 1. The present invention sets a screening component, and the supporting component exposes the pressure sensor when it is in operation. When the blockage degree of the sieve plate exceeds a threshold value, the pressure sensor sends a piezoelectric signal, and the stretching component pulls up and releases the sieve plate. At the same time, the supporting component continuously pushes the arc block upward, so that under the action of the spring and the deadweight of the sieve plate, the sieve plate collides with the arc block for many times, thereby quickly cleaning the sieve plate and protecting the piezoelectric sensor to avoid damage caused by collision with the sieve plate. Therefore, the sieve plate can be cleaned in time when the blockage degree of the sieve plate exceeds a threshold value. The sieve plate does not need to adopt a timed cleaning structure, thereby avoiding the disadvantage that the timed cleaning structure cannot respond in time.

[0020] 2. The present invention provides a circulation component and a screening component. The circulation component draws in external air, and the screening component screens out large particles in the air. Thus, when the sampling head samples the air drawn in by the circulation component, large particles in the air can be screened out, and large particles stuck on the sieve plate can be cleaned to avoid clogging of the sieve plate and affecting the sampling of the sampling head, thereby extending the service life of the dust detection device.

[0021] 3. The present invention is provided with a circulation component. When the circulation component draws in and discharges the outside air, the discharged air is blown toward the protrusion. The blown air can blow the sand and other impurities accumulated under the protrusion off from the top of the machine body, thereby preventing the accumulated sand from being sucked into the installation shell.

[0022] 4. The present invention provides a blow-off component, which intercepts part of the air delivered by the fan, so as to blow off the large particles accumulated above the mounting block and the pressure sensor, thereby preventing the large particles from affecting the subsequent detection of the pressure sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the overall structure of a dust detection device for construction proposed by the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of a sampling head, a circulation component, a screening component and a blowing component of a dust detection device for construction proposed by the present invention;

[0025] Figure 3 This is a cross-sectional view of the structure of a sampling head, a circulation component, a screening component and a blowing component of a dust detection device for construction proposed by the present invention;

[0026] Figure 4 This is a schematic diagram of the disassembly of the sampling head and circulation component structure of a dust detection device for construction proposed by the present invention;

[0027] Figure 5 A cross-sectional view of the structure of a flow assembly of a dust detection device for construction proposed by the present invention;

[0028] Figure 6 A schematic diagram of the structure of a blow-off component of a dust detection device for construction proposed by the present invention;

[0029] Figure 7 This is a schematic diagram of the structure of a screening component of a dust detection device for construction proposed by the present invention;

[0030] Figure 8 This is a schematic diagram of the structure of the supporting components of a dust detection device for construction proposed by the present invention;

[0031] Fig. 9 This is a cross-sectional view of the structure of the supporting components of a dust detection device for construction proposed by the present invention.

[0032] In the figure: 1. mounting bracket; 2. display screen; 3. machine body; 4. wind vane; 5. wind direction sensor; 6. sampling head; 7. containing shell; 8. air outlet pipe; 9. first elbow pipe; 10. fan; 11. second elbow pipe; 12. mounting shell; 13. connecting rod; 14. bump; 15. guide shell; 16. first cavity; 17. second cavity; 18. flow hole; 19. annular tube; 20. connecting pipe; 21. air inlet shell; 22. air outlet hole; 23. fixing frame; 24. first electric telescopic rod; 25. electromagnet; 26. fixing plate; 27. spring; 28. connecting plate; 29. ​​sieve plate; 30. iron block; 31. mounting block; 32. pressure sensor; 33. support block; 34. protective shell; 35. mounting plate; 36. arc block; 37. second electric telescopic rod. DETAILED DESCRIPTION

[0033] The following examples are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0034] Reference Figure 1 A dust detection device for construction includes a mounting bracket 1, a display screen 2 and a body 3 are mounted on the mounting bracket 1, a wind vane 4 is mounted on the body 3, a wind direction sensor 5 is mounted on the wind vane 4, and also includes: a sampling head 6, the sampling head 6 is mounted on the top of the body 3.

[0035] The display screen 2 is used to display the detection result of the body 3, and the body 3 adopts the existing technology to detect the dust in the air.

[0036] The wind vane 4 and the wind direction sensor 5 adopt the existing technology group. The wind vane 4 is used to indicate the wind direction in real time, and the wind direction sensor 5 is used to accurately measure the wind direction data.

[0037] Reference Figure 2-Figure 4 , a flow component, an output end of the flow component is connected to an input end of the sampling head 6, and the input end is connected to a mounting shell 12 with a bottom opening.

[0038] A plurality of connecting rods 13 are fixedly connected to the bottom of the mounting shell 12, and a same convex block 14 is fixedly connected to the bottom ends of the plurality of connecting rods 13. The convex block 14 is fixedly connected to the top of the body 3, and the top of the convex block 14 is arc-shaped.

[0039] The circulation component includes a containing shell 7, the input end of the sampling head 6 is connected to the inside of the containing shell 7, the bottom of the containing shell 7 is connected to an air outlet pipe 8, and the top is connected to a first elbow 9, a fan 10 is installed at one end of the first elbow 9 away from the containing shell 7, the input end of the fan 10 is connected to a second elbow 11, and the end of the second elbow 11 away from the fan 10 is connected to the top of the installation shell 12.

[0040] Reference Figure 5 The end of the air outlet pipe 8 away from the accommodating shell 7 is connected to a guide shell 15, and a first cavity 16 and a second cavity 17 are arranged in the guide shell 15. The air inlet end of the first cavity 16 is connected to the air outlet pipe 8, and the air outlet end is connected to a plurality of flow holes 18. The ends of the plurality of flow holes 18 away from the first cavity 16 are all connected to the second cavity 17. The cross-sectional size of the second cavity 17 gradually increases from the air inlet end to the air outlet end, and the output direction of the air outlet end of the second cavity 17 points to the protrusion 14.

[0041] Reference Figure 7 , a screening assembly, the screening assembly includes a screen plate 29, and the screen plate 29 is slidably connected in the mounting shell 12.

[0042] Two elastic components are fixedly connected to the top of the sieve plate 29, and the top of the elastic component is fixedly connected to the inner wall of the mounting shell 12. The elastic component includes a fixing plate 26, and the fixing plate 26 is fixedly connected to the inner wall of the mounting shell 12. The bottom of the fixing plate 26 is fixedly connected to a spring 27, and the bottom end of the spring 27 is fixedly connected to a connecting plate 28, and the bottom of the connecting plate 28 is fixedly connected to the top edge of the sieve plate 29.

[0043] A stretching component is connected to the top of the installation shell 12, and the output end of the stretching component is connected to the sieve plate 29. The stretching component is used to pull the sieve plate 29 to move upward.

[0044] The stretching component includes a fixed frame 23, which is fixedly connected to the top of the mounting shell 12. A first electric telescopic rod 24 is installed on the fixed frame 23. An electromagnet 25 is installed at the output end of the first electric telescopic rod 24. An iron block 30 is fixedly connected to the sieve plate 29. The bottom of the electromagnet 25 is arranged opposite to the iron block 30. When the electromagnet 25 is energized, it magnetically attracts the iron block 30.

[0045] Reference Figure 8 and Fig. 9Two supporting components are connected to the bottom of the mounting shell 12, and the two supporting components correspond to the two elastic components one by one. The supporting components include a mounting block 31 and a supporting block 33 fixedly connected to the inner wall of the mounting shell 12, a pressure sensor 32 is installed on the top of the mounting block 31, and a second electric telescopic rod 37 is installed on the supporting block 33. The output end of the second electric telescopic rod 37 is fixedly connected to a mounting plate 35, and two arc blocks 36 are fixedly connected to the top of the mounting plate 35. The top ends of the two arc blocks 36 pass through the mounting block 31 and abut against the bottom of the sieve plate 29. The tensile component, the pressure sensor 32 and the second electric telescopic rod 37 are all electrically connected to a controller, and the controller is installed on the body 3.

[0046] A protective shell 34 is fixedly connected to the support block 33 , and the protective shell 34 is sleeved on the outer surface of the second electric telescopic rod 37 .

[0047] The top of the arc block 36 is initially located at the bottom of the screen plate 29 in the naturally stretched state of the spring 27 .

[0048] Reference Figure 6 A blow-off assembly is connected to the mounting shell 12, and the blow-off assembly includes an annular tube 19, which is fixedly connected to the mounting shell 12. Two groups of air outlet holes 22 are opened on the annular tube 19. The input ends of the two groups of air outlet holes 22 are connected to the inside of the annular tube 19, and the output ends point to the tops of the two mounting blocks 31 one by one. A connecting tube 20 is connected to one side of the annular tube 19. The connecting tube 20 seals and penetrates the mounting shell 12 and the first elbow 9 at one end away from the annular tube 19, and is connected to an air intake shell 21. The air intake shell 21 is open at one end away from the first elbow 9, and the opening direction points to the output end of the fan 10.

[0049] When the controller is working, it controls the output end of the second electric telescopic rod 37 to contract so that the top of the arc block 36 moves to below the pressure sensor 32, and receives the piezoelectric signal of the pressure sensor 32 to control the working state of the first electric telescopic rod 24 and the electromagnet 25.

[0050] In the present invention, the mounting bracket 1 is used to support the display screen 2 and the machine body 3. When the fan 10 is working, the external air can be sucked into the mounting shell 12. The air flows along the track of the mounting shell 12, the second elbow 11, the fan 10, the first elbow 9, the air outlet pipe 8 and the guide shell 15. The air inside the housing 7 can be sucked into the machine body 3 through the sampling head 6 for dust detection. The detection result is displayed on the display screen 2.

[0051] When in use, the outside air is sent into the accommodating shell 7 through the fan 10. When the air passes through the sieve plate 29, the large particles mixed in the air are screened out by the sieve plate 29. At the same time, when the air passes through the sieve plate 29, the sieve plate 29 will be pushed upward. Under the elastic force of the spring 27, the sieve plate 29 can swing up and down, thereby reducing the possibility of large particles blocking the sieve holes of the sieve plate 29. At this time, the height of the upper end of the arc block 36 is higher than the height of the upper end of the pressure sensor 32, thereby preventing the sieve plate 29 from hitting the pressure sensor 32 and damaging it when it swings up and down.

[0052] A portion of the air blown into the first curved pipe 9 by the fan 10 can enter the annular pipe 19 along the air inlet housing 21 and the connecting pipe 20. Since the two groups of air outlet holes 22 are respectively opened above the two groups of mounting blocks 31, the air blown out through the air outlet holes 22 can blow off the large particles accumulated above the mounting blocks 31 and the pressure sensor 32, thereby preventing the large particles from affecting the subsequent detection of the pressure sensor 32.

[0053] Since the upper end of the protrusion 14 is set as a convex arc surface, the large particles screened by the screen plate 29 can slide along the surface of the protrusion 14 and accumulate on the body 3, which can achieve the screening of large particles of dust in the air and reduce the possibility of damage to the sampling head 6;

[0054] The gas inside the accommodating shell 7 can be discharged through the air outlet pipe 8 and the guide shell 15. The cross-sectional size of the second cavity 17 gradually increases from the air inlet end to the air outlet end. When the air in the air outlet pipe 8 passes through the first cavity 16, the second cavity 17 and the flow hole 18 in sequence, the air flow will be diverted by the multiple groups of flow holes 18, thereby expanding the blowing range. The blown air can blow the impurities such as sand accumulated under the protrusion 14 off from the top of the body 3, preventing the accumulated sand from being sucked into the installation shell 12.

[0055] After the fan 10 is turned on for a certain period of time, the air inside the housing 7 is completely replaced, and then the air inside the housing 7 is sampled through the sampling head 6, which can prevent the residual air inside the housing 7 from affecting the sampling structure, thereby improving the sampling accuracy;

[0056] Since the arc block 36 is fixedly arranged on the upper end of the mounting plate 35, and the mounting plate 35 is fixedly connected to the upper end of the second electric telescopic rod 37, the height of the two groups of arc blocks 36 can be adjusted by extending and retracting the second electric telescopic rod 37, and the protective housing 34 is sleeved on the outer surface of the second electric telescopic rod 37, which can reduce the wear of the second electric telescopic rod 37 by large particles entering the interior of the mounting housing 12;

[0057] After the device has been used for a period of time, some large particles will inevitably be stuck inside the sieve holes of the sieve plate 29. When the sampling head 6 finishes sampling, the dust detection results are analyzed through the machine body 3. At this time, the fan 10 is turned off, so that the sieve plate 29 no longer shakes, and the controller starts to work, controlling the output end of the second electric telescopic rod 37 to contract, so that the two groups of arc blocks 36 move downward with the mounting plate 35, so that the upper ends of the two groups of arc blocks 36 are lower than the height of the upper end of the pressure sensor 32, and the sieve plate 29 is fixedly connected to the lower end of the spring 27 through the connecting plate 28, so that the more large particles are stuck on the sieve plate 29, the greater the downward pulling force on the spring 27, so that the position of the sieve plate 29 is lower;

[0058] When the weight of the large particles caught on the sieve plate 29 exceeds a preset value, the sieve plate 29 will contact the pressure sensor 32. After the pressure sensor 32 detects the contact of the sieve plate 29, the output end of the first electric telescopic rod 24 is extended to move the electromagnet 25 downward for a distance, so that the electromagnet 25 contacts the iron block 30. Then, the electromagnet 25 is energized to magnetically adsorb the iron block 30. Then, the output end of the first electric telescopic rod 24 is contracted to pull the electromagnet 25 upward, so that both the iron block 30 and the sieve plate 29 move upward.

[0059] When the sieve plate 29 moves upward, the two groups of springs 27 are compressed, and at the same time, the upper end of the arc block 36 is made higher than the upper end of the pressure sensor 32 through the second electric telescopic rod 37, and the arc block 36 moves upward slowly, and then the electromagnet 25 is turned off. Under the elastic force of the spring 27 and the gravity of the sieve plate 29, the sieve plate 29 moves downward quickly and collides with the arc block 36. As the arc block 36 continues to move upward, the sieve plate 29 collides with the arc block 36 multiple times under the elastic force of the spring 27, so that large particles stuck in the sieve holes of the sieve plate 29 can be shaken off;

[0060] After the vibration ends, the first electric telescopic rod 24 is controlled to return to its original position, and the second electric telescopic rod 37 is controlled to move the arc block 36 to under the pressure sensor 32 again. If the sieve plate 29 is still in contact with the pressure sensor 32, the controller will work again to vibrate the sieve plate 29 until the sieve plate 29 is no longer in contact with the pressure sensor 32, and then control the second electric telescopic rod 37 to return to its original position.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A dust detection device for construction, comprising a mounting bracket (1), a display screen (2) and a body (3) mounted on the mounting bracket (1), a wind vane (4) mounted on the body (3), a wind direction sensor (5) mounted on the wind vane (4), characterized in that: Also includes: A sampling head (6), wherein the sampling head (6) is mounted on the top of the machine body (3); A circulation component, wherein the output end of the circulation component is connected to the input end of the sampling head (6), and the input end is connected to a mounting shell (12) having a bottom opening; A screening assembly, the screening assembly comprising a screen plate (29), the screen plate (29) being slidably connected in a mounting shell (12), the top of the screen plate (29) being fixedly connected to two elastic components, the top of the elastic components being fixedly connected to the inner wall of the mounting shell (12), the top of the mounting shell (12) being connected to a stretching component, the output end of the stretching component being connected to the screen plate (29), the stretching component being used to pull the screen plate (29) to move upward, the bottom of the mounting shell (12) being connected to two supporting components, the two supporting components corresponding to the two elastic components one by one, the supporting component comprising a support fixedly connected to the mounting shell (1 2) a mounting block (31) and a support block (33) on the inner wall, a pressure sensor (32) being mounted on the top of the mounting block (31), a second electric telescopic rod (37) being mounted on the support block (33), a mounting plate (35) being fixedly connected to the output end of the second electric telescopic rod (37), two arc blocks (36) being fixedly connected to the top of the mounting plate (35), the top ends of the two arc blocks (36) passing through the mounting block (31) and resting against the bottom of the sieve plate (29), the stretching component, the pressure sensor (32) and the second electric telescopic rod (37) being electrically connected to a controller, and the controller being mounted on the machine body (3).

2. A dust detection device for construction according to claim 1, characterized in that: A plurality of connecting rods (13) are fixedly connected to the bottom of the mounting shell (12); the bottom ends of the plurality of connecting rods (13) are fixedly connected to the same protrusion (14); the protrusion (14) is fixedly connected to the top of the machine body (3); and the top of the protrusion (14) is arc-shaped.

3. A dust detection device for construction according to claim 2, characterized in that: The circulation component comprises a containing shell (7), the input end of the sampling head (6) is connected to the inside of the containing shell (7), the bottom of the containing shell (7) is connected to an air outlet pipe (8), and the top is connected to a first curved pipe (9), a fan (10) is installed at one end of the first curved pipe (9) away from the containing shell (7), the input end of the fan (10) is connected to a second curved pipe (11), and the end of the second curved pipe (11) away from the fan (10) is connected to the top of the mounting shell (12).

4. A dust detection device for construction according to claim 3, characterized in that: The outlet pipe (8) is connected to a flow guide shell (15) at one end away from the accommodating shell (7), and a first cavity (16) and a second cavity (17) are arranged in the flow guide shell (15). The air inlet end of the first cavity (16) is connected to the outlet pipe (8), and the air outlet end is connected to a plurality of flow holes (18). The ends of the plurality of flow holes (18) away from the first cavity (16) are all connected to the second cavity (17). The cross-sectional size of the second cavity (17) gradually increases from the air inlet end to the air outlet end, and the output direction of the air outlet end of the second cavity (17) points to the protrusion (14).

5. A dust detection device for construction according to claim 3, characterized in that: A blow-off assembly is connected to the installation shell (12), and the blow-off assembly comprises an annular tube (19). The annular tube (19) is fixedly connected to the installation shell (12). Two groups of air outlet holes (22) are provided on the annular tube (19). The input ends of the two groups of air outlet holes (22) are connected to the inside of the annular tube (19), and the output ends point to the tops of the two installation blocks (31) in a one-to-one correspondence. A connecting tube (20) is connected to one side of the annular tube (19). The end of the connecting tube (20) away from the annular tube (19) is sealed and penetrates the installation shell (12) and the first bent pipe (9), and is connected to an air intake shell (21). The end of the air intake shell (21) away from the first bent pipe (9) is open, and the opening direction points to the output end of the fan (10).

6. A dust detection device for construction according to claim 1, characterized in that: The elastic component comprises a fixing plate (26), wherein the fixing plate (26) is fixedly connected to the inner wall of the mounting shell (12), a spring (27) is fixedly connected to the bottom of the fixing plate (26), a connecting plate (28) is fixedly connected to the bottom end of the spring (27), and the bottom of the connecting plate (28) is fixedly connected to the top edge of the sieve plate (29).

7. A dust detection device for construction according to claim 6, characterized in that: The top end of the arc block (36) is initially located at the bottom of the screen plate (29) in a naturally stretched state of the spring (27).

8. A dust detection device for construction according to claim 1, characterized in that: The stretching component comprises a fixing frame (23), the fixing frame (23) is fixedly connected to the top of the mounting shell (12), a first electric telescopic rod (24) is mounted on the fixing frame (23), an electromagnet (25) is mounted on the output end of the first electric telescopic rod (24), an iron block (30) is fixedly connected to the sieve plate (29), the bottom of the electromagnet (25) is arranged opposite to the iron block (30), and the electromagnet (25) magnetically attracts the iron block (30) when energized.

9. A dust detection device for construction according to claim 1, characterized in that: A protective shell (34) is fixedly connected to the support block (33), and the protective shell (34) is sleeved on the outer surface of the second electric telescopic rod (37).

10. A dust detection device for construction according to claim 1, characterized in that: When the controller is working, it controls the output end of the second electric telescopic rod (37) to contract so that the top of the arc block (36) moves to below the pressure sensor (32), and receives the piezoelectric signal of the pressure sensor (32) to control the working state of the first electric telescopic rod (24) and the electromagnet (25).

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