An automatic monitoring device for moisture content of sand and gravel produced online

Abstract

The present application discloses an automatic monitoring device for the moisture content of sand and gravel produced online, which relates to the technical field of detection technology. The device is arranged on an aggregate bucket machine, and includes an online infrared moisture meter. The online infrared moisture meter includes a detection part, a rotating rod is rotatably connected in the aggregate bucket, a sampling area is arranged on the rotating rod, and a plurality of mounting rods are arranged on the sampling area. Each mounting rod is located on a horizontal plane at a different height, a material receiving plate is fixed at one end of the mounting rod, a guide ring is fixedly connected to the inner wall of the aggregate bucket, an adjustment mechanism is arranged on the rotating rod, and a first driving source is arranged in the aggregate bucket; the detection part is located at the lower side of the guide ring, a discharge seat is rotatably connected to the inner wall of the aggregate bucket, and a plurality of material placing plates are arranged in the vertical direction of the discharge seat, a blocking structure is arranged on the discharge seat, and all the material placing plates are located within the detection range of the detection part, and a second driving source is arranged on the aggregate bucket. The present application enables part of the aggregate to be decelerated for the detection effect of the online infrared moisture meter.

Description

Technical Field

[0001] The present application relates to the technical field of detection technology, and in particular to an automatic monitoring device for the moisture content of sand and gravel produced online. Background Art

[0002] At present, in the process of house construction, concrete is needed for pouring. Concrete is usually produced in a special concrete mixing station. The necessary materials are conveyed and mixed through various conveying devices. For example, the conveying of some aggregates such as sand and stone. Since the moisture content of different aggregates is different, when the moisture content of aggregates is too high, the final concrete will be too thin. Therefore, technicians need to understand the moisture content of aggregates in real time to facilitate the configuration of concrete. Usually, an automatic moisture content monitoring device is set on the conveyor line.

[0003] In the related art, a patent document with an authorization announcement number of CN207832667U discloses an automatic monitoring device for moisture content of aggregates, which is arranged on an aggregate bucket machine. The aggregate bucket machine includes a transmission frame, a conveyor belt driven on the transmission frame by a motor, and a fixed frame arranged outside one end of the conveyor belt, and an aggregate hopper installed on the fixed frame and located above the conveyor belt. After the aggregate falls from the inside of the aggregate hopper, it can fall onto the conveyor belt to continue to be transported; an online infrared moisture meter is arranged on the aggregate hopper for detecting the moisture content of the aggregate passing through the aggregate hopper, and two light-emitting alarm lights and an alarm are arranged on the transmission frame. When it is detected that the moisture content of the aggregate in the aggregate hopper does not meet the requirements, an alarm can be issued.

[0004] In the process of implementing this application, the inventors found that there are at least the following problems in this technology: when there is less material entering the aggregate hopper or the material transferred through the aggregate hopper moves at a faster speed, the aggregate moves too fast relative to the online infrared moisture meter, which may cause the online infrared moisture meter to fail to analyze the aggregate in time, and this part of the aggregate is out of the detection range of the online infrared moisture meter, which may easily cause measurement errors. Summary of the invention

[0005] In order to slow down part of the aggregate so as to provide it for detection by an online infrared moisture meter, the present application provides an automatic monitoring device for the moisture content of sand and gravel produced online.

[0006] The present application provides an online production sand and gravel moisture content automatic monitoring device, which adopts the following technical solution:

[0007] An automatic monitoring device for the moisture content of sand and gravel produced online is arranged on an aggregate bucket machine, comprising an online infrared moisture meter arranged on the aggregate hopper, the online infrared moisture meter comprising a detection part located in the aggregate hopper, a vertical rotating rod rotatably connected in the aggregate hopper, a sampling area is arranged on the rotating rod, a plurality of horizontal mounting rods are arranged on the sampling area, the mounting rods face different directions of the rotating rod, and each mounting rod is located on a horizontal plane at a different height, a receiving plate for accommodating aggregates is fixedly connected to one end of the mounting rod away from the rotating rod, a guide ring is fixedly connected to the inner wall of the aggregate hopper, an adjusting mechanism for driving the receiving plate to enter or leave the bottom of the guide ring is arranged on the rotating rod, a first driving source for driving the rotating rod to rotate is arranged in the aggregate hopper, and the first driving source for driving the rotating rod to rotate is used to drive the mounting rod to rotate when the rotating rod rotates;

[0008] The detection part is located at the lower side of the guide ring, the inner wall of the aggregate hopper is rotatably connected to a discharge seat mounted on the outside of the detection part, the height of the discharge seat is consistent with the height of the sampling area, the discharge seat is provided with a plurality of placing plates in the vertical direction, there is a gap between adjacent placing plates for the passage of receiving plates, and the discharge seat is provided with a blocking structure that allows the aggregate on the receiving plate to stay on the placing plates, all the placing plates are located within the detection range of the detection part, and the aggregate hopper is provided with a second driving source that drives the discharge seat to rotate intermittently.

[0009] By adopting the above technical scheme, aggregates fall downward from the inner cavity of the aggregate hopper. When there are more aggregates in the aggregate hopper, the rotating rod can be rotated to achieve a stirring effect; the aggregates fall and are guided by the guide ring and can move toward the middle of the aggregate hopper. Aggregates falling from different positions can be collected on the receiving plate, and the multiple mounting rods are driven to move by the adjustment mechanism so that the receiving plate enters the bottom of the guide ring; during the rotation of the mounting rod, each receiving plate can pass through the interval between the placing plates and retain the aggregates on the placing plates through the blocking structure. Since all the placing plates are within the detection range of the online infrared moisture meter, the online infrared moisture meter can detect the aggregates staying on the placing plates. After the aggregates on each receiving plate move to the placing plate, the receiving plate can be separated from the guide ring by the adjustment mechanism, so that the receiving plate is not easy to interfere with the discharge seat, and the receiving plate can be used for a new round of receiving. After the detection is completed, the discharge seat is driven to rotate one circle by the second driving source, so that the aggregates on the placing plate can be poured downward, and the discharge seat can be used for the next detection.

[0010] Optionally, a plurality of sliding seats for sliding different mounting rods are fixed on the outer wall of the rotating rod, the rotating rod is a hollow tube, and the end of the mounting rod away from the receiving plate is located inside the rotating rod, the adjusting mechanism includes a frustum block which moves inside the rotating rod in the vertical direction, the axial diameter of the frustum block gradually shortens upward in the vertical direction, the end of the rotating rod abuts against the outer wall of the frustum block, and a third driving source for driving the rotating rod to move up and down in the vertical direction is provided in the aggregate hopper.

[0011] By adopting the above technical solution, the third driving source drives the truncated pedestal to rise, and the truncated pedestal is used to push a plurality of mounting rods to move simultaneously, so that the receiving plate can move to the bottom of the guide ring.

[0012] Optionally, the sliding seat includes a sliding cavity in the middle, and the inner walls facing each other in the sliding cavity are provided with through holes for the mounting rod to move. An abutment edge located in the sliding cavity is fixedly connected to the outer wall of the mounting rod, and a spring is provided between the abutment edge and the inner wall of the sliding cavity close to the rotating rod and is sleeved outside the mounting rod for resetting the mounting rod.

[0013] By adopting the above technical solution, when the truncated cone block pushes the mounting rod to move, the abutment plate can compress the spring. When the truncated cone block drops, the mounting rod can slide back to its original position through the elastic force of the spring, so that the receiving plate is separated from the bottom of the guide ring.

[0014] Optionally, the unloading seat includes a rotating sleeve rotatably connected to the inner wall of the aggregate hopper, the rotating sleeve is arranged outside the detection part, a ring tooth portion is arranged on the outer wall of the rotating sleeve, a gear meshing with the ring tooth portion is rotatably arranged inside the aggregate hopper, and the second driving source drives the gear to rotate intermittently.

[0015] By adopting the above technical solution, the second driving source intermittently drives the gear to rotate, and due to the meshing of the gear and the ring gear portion, the unloading seat is driven to rotate intermittently.

[0016] Optionally, the rotating sleeve includes a connecting plate away from the inner wall of the aggregate hopper, a detection port for detection by the detection unit is opened in the middle of the connecting plate, one end of the placing plate is fixedly connected to a side of the connecting plate away from the inner wall of the aggregate hopper, and both ends of the placing plate are respectively located on different sides of the detection port.

[0017] By adopting the above technical solution, the material placing plate is supported by the connecting plate, and a part of the material placing plate is exposed in the detection port, so that the online infrared moisture meter can detect the aggregate on the material placing plate.

[0018] Optionally, the blocking structure includes a pushing bar fixedly connected to the bottom surface of the material placement plate, and when the material receiving plate passes through the unloading seat, the pushing bar is used to push the aggregate on the material receiving plate onto the material placement plate.

[0019] By adopting the above technical solution, when the receiving plate passes through the unloading seat, the pushing bar is used to push the aggregate on the receiving plate to the placing plate, and the receiving plate can pass through the gap of the placing plate.

[0020] Optionally, two parallel limiting strips are fixedly connected to the surface of the receiving plate, and the limiting strips are respectively located at one end of the receiving plate close to and away from the rotating rod.

[0021] By adopting the above technical solution, the limiting strip is set to reduce the chance of aggregate on the receiving plate detaching from the receiving plate during rotation, so that the receiving plate can better retain aggregates at different positions and play a role in multi-point sampling.

[0022] Optionally, the material guiding ring includes a material guiding surface at the top, and the material guiding surface is inclined downward toward the direction approaching the rotating rod.

[0023] By adopting the above technical solution, the aggregate can be better moved toward the middle of the aggregate hopper through the guide surface during the falling process, and the aggregate is not easy to fall from the lower part of the guide ring.

[0024] In summary, the present application includes at least one of the following beneficial effects:

[0025] 1. After the aggregate falls and is guided by the guide ring, it can move toward the middle of the aggregate hopper. Aggregates falling from different positions can be collected on the receiving plate. The multiple mounting rods are driven to move by the adjustment mechanism so that the receiving plate enters the bottom of the guide ring. During the rotation of the mounting rods, each receiving plate can pass through the interval between the placing plates and retain the aggregate on the placing plates through the blocking structure. Since all the placing plates are within the detection range of the online infrared moisture meter, the online infrared moisture meter can detect the aggregates remaining on the placing plates. After the aggregates on each receiving plate move to the placing plate, the receiving plate can be separated from the guide ring by the adjustment mechanism, so that the receiving plate is not easy to interfere with the discharge seat, and the receiving plate can be used for a new round of receiving. After the detection is completed, the discharge seat is driven to rotate one circle by the second driving source, so that the aggregates on the placing plates can be poured downward, and the discharge seat can be used for the next detection.

[0026] 2. When there are a lot of aggregates in the aggregate hopper, the rotating rod can be used to stir them;

[0027] 3. By setting the limit strip, the aggregate on the receiving plate can be reduced from detaching from the receiving plate during rotation, so that the receiving plate can better retain aggregates at different positions and play the role of multi-point sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of this embodiment of the present application;

[0029] Figure 2 It is a schematic diagram of a partial cross-sectional structure of this embodiment of the present application;

[0030] Figure 3 It is a partial schematic diagram showing the structure of the accommodation cavity in this embodiment of the present application;

[0031] Figure 4 yes Figure 2 The enlarged schematic diagram of point A in the middle;

[0032] Figure 5 It is a partial schematic diagram showing the structure of the discharge seat in this embodiment of the present application;

[0033] Figure 6 yes Figure 2 A magnified schematic diagram of point B in the middle.

[0034] Explanation of reference numerals: 1, aggregate bucket machine; 2, aggregate bucket; 21, online infrared moisture meter; 211, detection unit; 22, rotating rod; 221, long groove; 222, sliding seat; 2221, sliding cavity; 2222, spring; 2223, perforation; 223, sampling area; 23, upper support frame; 231, first motor; 232, upper fixing bar; 24, lower support frame; 241, electric push rod; 242, lower fixing bar; 243, round table block ; 25. Accommodating chamber; 251. Rotating shaft; 252. Gear; 253. Second motor; 26. Mounting rod; 261. Abutting edge; 262. Receiving plate; 263. Limiting strip; 27. Discharging seat; 271. Rotating sleeve; 272. Connecting plate; 273. Detection port; 274. Placing plate; 2741. Pushing strip; 275. Ring gear portion; 28. Material guide ring edge; 281. Material guide surface; 3. Transmission frame; 31. Conveyor belt; 32. Fixed frame. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1-6 This application is described in further detail.

[0036] Reference Figure 1 An aggregate bucket machine 1 is provided on the concrete configuration production line. The aggregate bucket machine 1 includes a transmission frame 3. The transmission frame 3 includes a fixed frame 32 on one side, a conveyor belt 31 driven on the transmission frame 3 by a motor, and an aggregate hopper 2 fixedly connected to the fixed frame 32 and located above the conveyor belt 31. The aggregate hopper 2 includes a accommodating chamber 25 that passes through the middle part from top to bottom. After the aggregate falls from the accommodating chamber 25, it can fall onto the conveyor belt 31 to continue to be transported.

[0037] The embodiment of the present application discloses an automatic monitoring device for the moisture content of sand and gravel produced online, referring to Figure 1 and Figure 2 An online automatic monitoring device for the moisture content of sand and gravel production includes an online infrared moisture meter 21 arranged on an aggregate hopper 2. The online infrared moisture meter 21 includes a detection part 211 located on the inner wall of the accommodating cavity 25. The detection part 211 can detect the moisture content of the aggregate within the irradiation range.

[0038] Reference Figure 2 and Figure 3 The accommodating chamber 25 is a cylindrical section including an upper part and a conical section at the lower part. The detection part 211 is arranged on the cylindrical section. A rotating rod 22 is arranged to rotate at the axial position of the accommodating chamber 25. A first driving source for driving the rotating rod 22 to rotate is arranged in the aggregate hopper 2. Four horizontal mounting rods 26 are arranged on the rotating rod 22 at intervals of ninety degrees around its axis. A receiving plate 262 for receiving materials is fixedly connected to one end of the mounting rod 26 away from the rotating rod 22. Aggregates dropped from the accommodating chamber 25 can be received through the receiving plate 262 and transferred to the detection part 211 for detection. In other embodiments of the present application, the mounting rods 26 can be set to other values ​​according to needs, and the interval angles can also be consistent or inconsistent, so as to play a role of multi-point sampling.

[0039] Reference Figure 2 and Figure 3 , a sampling area 223 is provided on the rotating rod 22, and four mounting rods 26 are slidably provided on the sampling area 223, and the sliding direction is perpendicular to the rotating rod 22. The height of the sampling area 223 is consistent with the height of the detection part 211, and a discharge seat 27 for collecting the aggregate to be detected is provided on the inner wall of the accommodating cavity 25, and a blocking structure is provided on the discharge seat 27. When the receiving plate 262 passes through the discharge seat 27, the aggregate on the receiving plate 262 can be retained on the discharge seat 27 through the blocking structure. The discharge seat 27 is within the irradiation range of the detection part 211, so that the detection part 211 can detect the aggregate on the discharge seat 27.

[0040] Reference Figure 3 and Figure 4A guide ring 28 is arranged inside the accommodating chamber 25, and the upper surface of the guide ring 28 is inclined downward toward the axis direction of the accommodating chamber 25. When the material falls from the top of the accommodating chamber 25, the aggregate at the edge of the accommodating chamber 25 can be guided to the middle of the accommodating chamber 25, so that the material is not easy to fall or accumulate at the bottom of the guide ring 28. The rotating rod 22 is provided with an adjustment mechanism for driving the receiving plate 262 to enter or leave the bottom of the guide ring 28. The discharge seat 27 is located at the bottom of the guide ring 28, and the material is not easy to accumulate. When the receiving plate 262 leaves the bottom of the guide ring 28 through the adjustment mechanism, the receiving plate 262 is used to receive the material and is not easy to interfere with the discharge seat 27 during the rotation process; when the receiving plate 262 is located at the bottom of the guide ring 28 through the adjustment mechanism, the receiving plate 262 is not easy to collect aggregates. When the receiving plate 262 passes the discharge seat 27, the aggregate on the receiving plate 262 can be retained by the blocking structure.

[0041] Reference Figure 4 and Figure 5 , adjacent mounting rods 26 are on different horizontal planes, the unloading seat 27 includes a rotating sleeve 271 which is sleeved on the outside of the detection part 211 and rotatably connected to the inside of the accommodating chamber 25, the rotating sleeve 271 can be rotatably connected to the aggregate hopper 2 by means of, for example, a bearing or a limiting ring groove, the rotating sleeve 271 includes a connecting plate 272 away from the inner wall of the accommodating chamber 25, a detection port 273 for detection by the detection part 211 is opened in the middle of the connecting plate 272, a plurality of parallel placing plates 274 are fixedly connected to the surface of the connecting plate 272 away from the inside of the accommodating chamber 25, all the placing plates 274 are located within the height position of the detection port 273, and the two ends are fixedly connected to the two sides of the detection port 273. There are gaps between adjacent material placing plates 274 for different material receiving plates 262 to pass through. The blocking structure includes a pushing bar 2741 fixedly connected to one end of the bottom of the material placing plate 274. The pushing bar 2741 is located on the side where the material receiving plate 262 is separated from the unloading seat 27. When the material receiving plate 262 passes through the gap between adjacent material placing plates 274, the pushing bar 2741 pushes the material on the material receiving plate 262 to fall onto the material placing plate 274 for detection by the detection unit 211.

[0042] The outer wall of the rotating sleeve 271 is provided with an annular tooth portion 275, and the interior of the accommodating chamber 25 is rotatably connected with a rotating shaft 251 through a bearing, and a gear 252 located in the accommodating chamber 25 and meshing with the annular tooth portion 275 is fixedly connected to the rotating shaft 251. The end of the rotating shaft 251 away from the gear 252 is located outside the aggregate hopper 2 and is connected to a second driving source, which is specifically a second motor 253 connected to the outer wall of the aggregate hopper 2 by bolts. The second motor 253 is a servo motor that can intermittently drive the rotating shaft 251 to rotate. The gear 252 is driven to rotate by the second driving source, and the gear 252 and the annular tooth portion 275 are meshed to drive the rotating sleeve 271 to rotate, so that after the material detection on the material placement plate 274 is completed, the unloading seat 27 can be driven to rotate, so that the aggregate on the material placement plate 274 falls from the side of the material placement plate 274 away from the push bar 2741, and stops after the unloading seat 27 rotates one circle, which is convenient for the next detection.

[0043] Reference Figure 1 and Figure 3 The top of the accommodating chamber 25 is fixedly connected with an upper support frame 23, and the upper support frame 23 includes a plurality of upper fixing bars 232 fixed to the side wall or the top of the accommodating chamber 25. The first driving source is specifically a first motor 231 connected to the upper support frame 23 by bolts. The first motor 231 is a servo motor, and the rotating shaft 251 is connected to the output shaft of the first motor 231. The first motor 231 can drive the rotating rod 22 to rotate. When there are a lot of materials in the aggregate hopper 2, the mounting rod 26 can be used as a stirring rod when it rotates, which plays a role in breaking up the materials and reducing blockage.

[0044] Reference Figure 2 and Figure 6 , four sliding seats 222 for sliding different mounting rods 26 are fixedly connected to the sampling area 223, the sliding seat 222 includes a sliding cavity 2221 in the middle and a cover plate for closing the sliding cavity 2221 by bolts or welding, the cover plate is located on the side of the sliding seat 222 away from the rotating rod 22, and the inner wall of the cover plate and the sliding seat 222 is provided with a through hole 2223 for sliding the mounting rod 26. The rotating rod 22 includes a long groove 221 in the middle communicating with the through hole 2223, the adjustment mechanism includes a truncated cone block 243 vertically sliding in the long groove 221 and with a vertical axis, the truncated cone block 243 is in a shape of tapering in diameter vertically upward, and the outer wall of the mounting rod 26 abuts against the outer wall of the truncated cone block 243, and a third driving source for driving the truncated cone block 243 to rise or fall is provided in the accommodating cavity 25, and the receiving plate 262 can be indirectly driven to enter the bottom of the guide ring 28 by the third driving source.

[0045] Reference Figure 2 and Figure 3A lower support frame 24 is connected to the bottom of the accommodating chamber 25, and the lower support frame 24 includes a plurality of lower fixing bars 242 fixedly connected to the side walls or the bottom wall of the accommodating chamber 25. The third driving source is specifically an electric push rod 241 fixedly connected to the lower support frame 24, and the piston rod end of the electric push rod 241 is fixedly connected to the truncated cone block 243, so that the truncated cone block 243 can be driven to move during the movement of the piston rod of the electric push rod 241.

[0046] Reference Figure 6 The mounting plate includes an abutment edge 261 located in the sliding cavity 2221, and a spring 2222 sleeved on the outside of the sliding rod is abutted between the abutment edge 261 and the inner wall of the sliding cavity 2221 away from the rotating rod 22. When the truncated cone block 243 slides to the lowest position and the material receiving plate 262 leaves the bottom of the material guide ring edge 28, the spring 2222 is in a compressed state. When the truncated cone block 243 rises and pushes the mounting rod 26 to move, the spring 2222 continues to be compressed; when the truncated cone block 243 descends, under the elastic force of the spring 2222, the mounting rod 26 is reset so that the material receiving plate 262 can move away from the bottom of the material guide ring edge 28.

[0047] The implementation principle of an automatic monitoring device for the moisture content of sand and gravel produced online in the embodiment of the present application is as follows: when conveying aggregates, when the aggregates enter the accommodating chamber 25 from the top of the aggregate hopper 2, the first motor 231 drives the rotating rod 22 to rotate, and the materials falling near the edge of the aggregate hopper 2 can be guided to the middle of the accommodating chamber 25 by the guide ring 28; when the rotating rod 22 rotates, it drives the four mounting rods 26 to rotate slowly together, and the receiving plate 262 can receive the falling aggregates. When the four receiving plates 262 are all filled with aggregates, the electric push rod 241 pushes the truncated cone block 243 to move upward, and the truncated cone block 243 can push the four mounting rods 26, the spring 2222 is compressed, and the receiving plate 262 enters the bottom of the guide ring 28; the mounting rod 26 continues to rotate, and the receiving plate 262 passes through different intervals between the placing plates 274 in turn and passes through The pushing bar 2741 pushes the material on the receiving plate 262 onto the placing plate 274. At this time, the online infrared moisture meter 21 can detect the materials on multiple placing plates 274. After the four receiving plates 262 pass through the unloading seat 27 once, the truncated cone block 243 is pushed down by the electric push rod 241, and the spring 2222 releases the elastic force to move the mounting rod 26. The receiving plate 262 can leave the range where the guide ring edge 28 is located. At this time, the receiving plate 262 is not easy to interfere with the unloading seat 27. After the material detection on the unloading plate is completed, by driving the second motor 253, the second motor 253 drives the gear 252 to rotate, and the gear 252 and the ring tooth portion 275 are engaged to drive the unloading seat 27 to rotate one circle. During the rotation of the unloading seat 27, the aggregate can be dumped from the end of the placing plate 274 away from the pushing bar 2741, which is convenient for the next detection.

[0048] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An online production sand and gravel moisture content automatic monitoring device, arranged on an aggregate hopper (1), comprising an online infrared moisture meter (21) arranged on an aggregate hopper (2), the online infrared moisture meter (21) comprising a detection unit (211) located in the aggregate hopper (2), characterized in that: A vertical rotating rod (22) is rotatably connected in the aggregate hopper (2), a sampling area (223) is provided on the rotating rod (22), a plurality of horizontal mounting rods (26) are provided on the sampling area (223), the mounting rods (26) face different directions of the rotating rod (22), and each mounting rod (26) is located on a horizontal plane at a different height, a receiving plate (262) for accommodating aggregate is fixedly connected to one end of the mounting rod (26) away from the rotating rod (22), a guide ring edge (28) is fixedly connected to the inner wall of the aggregate hopper (2), an adjusting mechanism for driving the receiving plate (262) to enter or leave the bottom of the guide ring edge (28) is provided on the rotating rod (22), and a first driving source for driving the rotating rod (22) to rotate is provided in the aggregate hopper (2), and when the rotating rod (22) rotates, the first driving source is used to drive the mounting rod (26) to rotate; The detection portion (211) is located at the lower side of the guide ring (28); the inner wall of the aggregate hopper (2) is rotatably connected to a discharge seat (27) sleeved on the outside of the detection portion (211); the height of the discharge seat (27) is consistent with the height of the sampling area (223); the discharge seat (27) is provided with a plurality of material placement plates (274) in the vertical direction; there is a gap between adjacent material placement plates (274) for a receiving plate (262) to pass through; and the discharge seat (27) is provided with a blocking structure that allows aggregate on the receiving plate (262) to stay on the material placement plates (274); all the material placement plates (274) are located within the detection range of the detection portion (211); and the aggregate hopper (2) is provided with a second driving source that drives the discharge seat (27) to rotate intermittently.

2. The automatic monitoring device for moisture content of sand and gravel produced online according to claim 1 is characterized in that: A plurality of sliding seats (222) are fixed on the outer wall of the rotating rod (22) for sliding different mounting rods (26). The rotating rod (22) is hollow and tubular, and one end of the mounting rod (26) away from the receiving plate (262) is located inside the rotating rod (22). The adjusting mechanism comprises a truncated cone block (243) that moves inside the rotating rod (22) in a vertical direction. The axial diameter of the truncated cone block (243) gradually shortens upward in the vertical direction. The end of the rotating rod (22) abuts against the outer wall of the truncated cone block (243). A third driving source is provided inside the aggregate hopper (2) for driving the rotating rod (22) to move up and down in the vertical direction.

3. The automatic monitoring device for moisture content of sand and gravel produced online according to claim 2 is characterized in that: The sliding seat (222) comprises a sliding cavity (2221) in the middle, and the inner walls of the sliding cavity (2221) facing each other are provided with through holes (2223) for the installation rod (26) to move. The outer wall of the installation rod (26) is fixedly connected with an abutment edge (261) located in the sliding cavity (2221), and a spring (2222) is provided between the abutment edge (261) and the inner wall of the sliding cavity (2221) close to the rotating rod (22) and is sleeved outside the installation rod (26) for resetting the installation rod (26).

4. The automatic monitoring device for moisture content of sand and gravel produced online according to claim 2 is characterized in that: The discharge seat (27) comprises a rotating sleeve (271) rotatably connected to the inner wall of the aggregate hopper (2); the rotating sleeve (271) is sleeved outside the detection portion (211); an annular tooth portion (275) is provided on the outer wall of the rotating sleeve (271); a gear (252) meshing with the annular tooth portion (275) is rotatably provided inside the aggregate hopper (2); and the second driving source drives the gear (252) to rotate intermittently.

5. The automatic monitoring device for moisture content of sand and gravel produced online according to claim 4 is characterized in that: The rotating sleeve (271) comprises a connecting plate (272) away from the inner wall of the aggregate hopper (2); a detection port (273) for detection by the detection unit (211) is provided in the middle of the connecting plate (272); one end of the material placement plate (274) is fixedly connected to a side of the connecting plate (272) away from the inner wall of the aggregate hopper (2); and two ends of the material placement plate (274) are respectively located on different sides of the detection port (273).

6. The automatic monitoring device for moisture content of sand and gravel produced online according to claim 5 is characterized by: The blocking structure comprises a pushing bar (2741) fixedly connected to the bottom surface of the material placement plate (274); when the material receiving plate (262) passes through the material discharge seat (27), the pushing bar (2741) is used to push the aggregate on the material receiving plate (262) onto the material placement plate (274).

7. The automatic monitoring device for moisture content of sand and gravel produced online according to claim 6 is characterized by: Two parallel limiting strips (263) are fixedly connected to the surface of the material receiving plate (262), and the two limiting strips (263) are respectively located at one end of the material receiving plate (262) close to and away from the rotating rod (22).

8. The automatic monitoring device for moisture content of sand and gravel produced online according to claim 1 is characterized by: The material guiding ring (28) comprises a material guiding surface (281) at the top, and the material guiding surface (281) is inclined downward in a direction close to the rotating rod (22).

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