Real-time detection system for water content and specification of concrete raw material gravel

Abstract

The invention provides a concrete raw material gravel moisture content and specification real-time detection system which is characterized in that a slope frame is provided with a conveying belt, a driving mechanism drives the conveying belt to rotate around the inclined plane of the slope frame and drives gravel to climb, and a detection device is arranged on the slope frame in a striding mode. The detection device comprises a sliding shoe, a return mechanism, a moisture content sensor and a displacement sensor, the sliding shoe abuts against the inclined face of the conveying belt, the moisture content sensor faces gravel on the surface of the conveying belt and is used for detecting the moisture content of the gravel, and the displacement sensor faces the return mechanism and is used for detecting the displacement change of the sliding shoe. The problems that a concrete raw material gravel water content measurement error is large, a sensor is prone to being damaged, and the gravel specification cannot be measured at the same time are solved.

Description

Technical Field

[0001] The invention relates to the field of detection of construction concrete raw materials, and in particular to a real-time detection system for moisture content and specifications of concrete raw material sand and gravel. Background Art

[0002] In the production of concrete, sand and gravel are one of the raw materials of concrete, and they are mixed and produced through a set mix ratio. The moisture content of sand and gravel is a key parameter. The fluctuation of moisture content will affect the slump, strength and impermeability of concrete. When sand and gravel are stored, they are often piled in storage bins. Under the influence of gravity, the water content in the upper sand and gravel will drip to the bottom of the storage bin, resulting in inconsistent moisture content of sand and gravel in different parts of the storage bin. The moisture content of the top sand and gravel is lower than that of the bottom sand and gravel. The timely detection of moisture content and the accuracy of data are of great significance to improving the quality of concrete. At present, the timely detection of moisture content in some concrete mixing plants is mainly contact and non-contact.

[0003] Among them, the contact method uses microwave sensors to insert into sand and small-sized aggregates to achieve the purpose of online detection of sand and gravel moisture content. Some detection methods use sensors to insert into the sand and gravel being transported on the conveyor belt to collect data for detection. During high-speed transportation, the sand and gravel have a large impact on the sensor, which is easy to damage the sensor. For aggregates with larger particle sizes, the sensor cannot be inserted into them, resulting in inability to detect; some detection methods install moisture content sensors on the wall of the aggregate silo, but this method can only detect the moisture content of the sand and gravel in the hopper layer and above. The moisture content of sand and gravel below the sensor cannot be detected, resulting in measurement errors. The non-contact method uses an infrared moisture meter in combination with other technologies to collect data, mainly detecting the moisture content of the sand and gravel surface. Generally, the concrete mixing barrel is far away from the raw material area. During the transmission process, the moisture on the sand and gravel surface evaporates, and the moisture content detection data also has errors.

[0004] At the same time, these testing methods cannot test the specification parameters of sand and gravel at the same time, which makes the sand and gravel quality testing process complicated and reduces construction efficiency. Summary of the invention

[0005] The main purpose of the present invention is to provide a real-time detection system for the moisture content and specifications of concrete raw materials sand and gravel, so as to solve the problems that the measurement error of the moisture content of concrete raw materials sand and gravel is large, which easily causes damage to the sensor and cannot measure the sand and gravel specifications at the same time.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a real-time detection system for the moisture content and specifications of sand and gravel as concrete raw materials, a conveyor belt is provided on the slope frame, a driving mechanism drives the conveyor belt to rotate around the inclined surface of the slope frame, and drives the sand and gravel to climb, and a detection device is straddled on the slope frame. The detection device includes a sliding shoe, a return mechanism, a moisture content sensor and a displacement sensor. The sliding shoe rests on the inclined surface of the conveyor belt, and the moisture content sensor faces the sand and gravel on the surface of the conveyor belt to detect the moisture content of the sand and gravel. The displacement sensor faces the return mechanism to detect the displacement change of the sliding shoe.

[0007] In the preferred embodiment, the driving mechanism includes a belt roller, a rotating bearing and a driving motor. The belt roller is rotatably connected to both ends of the ramp frame. Rotating bearings are provided on both sides of the upper belt roller. The output shaft of the driving motor is connected to one side of the upper belt roller to drive the belt roller to rotate and drive the transport belt to climb. The upper end point of the outer contour of the belt roller is flush with the inclined surface of the ramp frame.

[0008] In the preferred embodiment, the detection device is arranged on the upper end of the slope frame through a bracket, at a position one-third of the length of the conveyor belt from the discharge port, and a bottom plate is arranged in the middle of the bracket, one end of the slide rod is connected to the middle of the slide shoe, and the other end passes through the cylinder in the middle of the bottom plate, so as to make the slide rod shuttle along the normal direction of the inclined surface of the slope frame; The slide rod is sleeved in the first spring, one end of the first spring is connected to the lower surface of the base plate, and the other end is connected to the upper surface of the slide shoe, forming a return mechanism for making the slide shoe abut against the surface of the conveyor belt.

[0009] In a preferred embodiment, the detection device is further provided with a rotation limit mechanism, wherein a rotation limit rod is arranged on one side of the slide rod, one end of which is connected to the upper surface of the slide shoe, and the other end of which passes through a limit hole on one side of the bottom plate, wherein the limit hole is adapted to the diameter of the rotation limit rod and its rotation radius; Alternatively, a rotation limit rod is arranged on both sides of the sliding rod, one end of each rotation limit rod is connected to the upper surface of the sliding shoe, and the other end passes through the limiting hole on one side of the base plate, and a shuttle ring is also provided on the rotation limit rod below the base plate, and a second spring sleeve is arranged on the rotation limit rod, one end of which is connected to the upper surface of the sliding shoe, and the other end is connected to the lower surface of the shuttle ring, and the second spring drives the shuttle ring to rest against the lower surface of the base plate.

[0010] In the preferred embodiment, the two ends of the sliding shoe in the length direction are tilted upward relative to the main body of the steel plate, and the tilting angle is adapted to the size of the sandstone; The lower surface of the slipper is also provided with outer ribs and inner ribs, and the outer ribs are symmetrically arranged along the center line of the length direction of the slipper. The two outer ribs have a first width at the feeding end of the slipper, and gradually decrease along the length direction of the slipper to the middle of the slipper to form a second width. The second width of the outer ribs remains unchanged and extends to the other end of the slipper.

[0011] In the preferred embodiment, the inner rib is in a V-shaped structure, arranged in the middle of the bottom surface of the sliding shoe and inside the two outer ribs, with the V-shaped tip facing the feeding end of the sliding shoe; The height of the inner layer ribs is smaller than the height of the outer layer ribs.

[0012] In the preferred embodiment, the moisture content sensor is arranged at the rear side of the opening of the V-shaped structure of the inner rib, and its lower end passes through the lower surface of the sliding shoe and extends to a distance equal to the height of the inner rib; The moisture content sensor is a combination of one or more types of resistive sensors, capacitive sensors, microwave sensors or infrared sensors.

[0013] In a preferred embodiment, the displacement sensor is a combination of one or more of a laser displacement sensor and an ultrasonic sensor, and is disposed above the slide bar through a housing, with its sensing probe facing the upper end of the slide bar; Alternatively, the displacement sensor is a combination of one or more of a Hall effect sensor, a magnetostrictive displacement sensor, and a linear displacement sensor, wherein the sensing element is arranged in the sliding rod, and the receiving end is correspondingly arranged on the cylinder.

[0014] In the preferred embodiment, a distance limiting nut is further provided at the upper end of the slide rod, and a proximity switch is provided on one side of the slide rod on the inner wall of the housing. The height of the proximity switch is adapted to the starting height of the slide shoe, and is used to determine when the sandstone begins to pass through the slide shoe; Alternatively, a distance limiting nut is further provided at the upper end of the slide rod, and a proximity switch is provided at the upper end of the cylinder, which is used to start the detection system when the proximity switch is no longer in contact with the distance limiting nut.

[0015] In a preferred embodiment, the detection device is further provided with a microcomputer, and the moisture content sensor, the displacement sensor, and the proximity switch are electrically connected to the microcomputer.

[0016] The present invention provides a real-time detection system for the moisture content and specifications of concrete raw materials, wherein a conveying belt is provided on the slope frame, and a driving mechanism drives the conveying belt to rotate around the inclined surface of the slope frame, driving the sand and gravel to climb, and a detection device is arranged across the slope frame. When the sand and gravel are conveyed through the detection device 4, they will be flattened by the ribs at the bottom of the sliding shoe 5, and then the surface sand and gravel will be scraped off, and then pass through the sand and gravel moisture content sensor, and at the same time, the sand and gravel will raise the sliding shoe 5, triggering the system to collect the relative height of the sliding shoe 5 and the moisture content of the sand and gravel data in real time, and calculate the specifications and moisture content of the sand and gravel in time through the fluctuation range of the relative height of the sliding shoe and the effective detection data algorithm of the moisture content of the sand and gravel, and push it to the upper system. The structure is simple and easy to install, and it can be used by simply installing and setting on the conveyor belt frame, without changing the original sand and gravel conveying system, greatly reducing the number of sensors set in multiple raw material bins of traditional mixing stations, and reducing the use cost. The device uses its own structural characteristics to adapt to the raw material type and particle size and preliminarily select the effective area for sand and gravel detection. The friction between sand and gravel and the sensor solves the problem of residual soil on the sensor surface in other detection methods. The validity of the moisture content data is determined by the distance data interval, and the specifications of the sand and gravel aggregates are determined by the distance data fluctuation. The original moisture content data is processed by the mean algorithm, which greatly improves the accuracy of the data and solves the problems of large error in measuring the moisture content of sand and gravel, the easy damage to the sensor, and the inability to measure the specifications of sand and gravel at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Figure 1 This is an axonometric structural diagram of the overall appearance of the present invention; Figure 2 It is a side view of the overall appearance of the present invention; Figure 3 It is a structural diagram of the driving mechanism of the present invention; Figure 4 is a side structural diagram of a detection device according to embodiment 1 of the present invention; Figure 5 is a cross-sectional structural diagram of the housing of the detection device of Example 1 of the present invention; Figure 6 This is a structural diagram of the bottom of the sliding shoe of the present invention; Figure 7 is a side view of the structure of the sliding shoe of the present invention; Figure 8 This is a main structural diagram of a detection device according to Embodiment 2 of the present invention; Fig. 9 is a top view of the structure of the detection device of Example 2 of the present invention; Fig.10 This is a main structural diagram of a detection device according to Embodiment 3 of the present invention; Fig.11It is a flow chart of the operation of the system of the present invention.

[0018] In the figure: ramp frame 1; transport belt 2; driving mechanism 3; belt roller 301; rotating bearing 302; driving motor 303; detection device 4; bracket 401; sliding shoe 5; outer rib 501; inner rib 502; moisture content sensor 6; displacement sensor 7; sensing element 701; receiving end 702; bottom plate 8; cylinder 801; limiting hole 802; sliding rod 9; first spring 10; rotating limiting rod 11; shuttle ring 1101; second spring 1102; housing 12; distance limiting nut 13; proximity switch 14; microcomputer 15. DETAILED DESCRIPTION

[0019] Example 1 like Figures 1 to 7 As shown in Figure 11, a real-time detection system for the moisture content and specifications of sand and gravel as concrete raw materials is provided. A conveyor belt 2 is provided on the slope frame 1. A driving mechanism 3 drives the conveyor belt 2 to rotate around the inclined surface of the slope frame 1 to drive the sand and gravel to climb. A detection device 4 is straddled on the slope frame 1. The detection device 4 includes a sliding shoe 5, a return mechanism, a moisture content sensor 6 and a displacement sensor 7. The sliding shoe 5 is against the inclined surface of the conveyor belt 2. The moisture content sensor 6 faces the sand and gravel on the surface of the conveyor belt 2 to detect the moisture content of the sand and gravel. The displacement sensor 7 faces the return mechanism to detect the displacement change of the sliding shoe 5.

[0020] The detection device 4 proposed in the present invention is fixed on the conveyor belt 3 of the concrete mixing station, near the discharge port of the conveyor belt 3 of the mixing station. When the sand and gravel are conveyed through the detection device 4, the sand and gravel will be flattened by the outer ribs 501 at the bottom of the sliding shoe 5 and the surface sand and gravel will be scraped off by the inner ribs 502, and then pass through the sand and gravel moisture sensor 6; the sand and gravel will raise the sliding shoe 5, triggering the system to collect the relative height of the sliding shoe 5 and the sand and gravel moisture content data in real time, and calculate the specifications and moisture content of the sand and gravel through the fluctuation range of the relative height of the sliding shoe and the effective detection data algorithm of the sand and gravel moisture content, and push it to the upper system.

[0021] In the preferred embodiment, the driving mechanism 3 includes a belt roller 301, a rotating bearing 302 and a driving motor 303. The belt roller 301 is rotatably connected to both ends of the ramp frame 1. Rotating bearings 302 are provided on both sides of the upper belt roller 301. The output shaft of the driving motor 303 is connected to one side of the upper belt roller 301. The belt roller 301 is driven to rotate, driving the transport belt 2 to climb. The upper end point of the outer contour of the belt roller 301 is flush with the inclined surface of the ramp frame 1 .

[0022] The crawling surface of the conveyor belt 2 is aligned with the inclined surface of the ramp frame 1 so that the sliding shoe 5 can be tightly pressed against the surface to be tested during the climbing process of the gravel, and no fluctuation error is generated due to the pulling up of the two ends of the conveyor belt 2.

[0023] In the preferred embodiment, the detection device 4 is straddled on the upper end of the slope frame 1 through a bracket 401, at a position one-third of the length of the conveying belt 2 from the discharge port, and a bottom plate 8 is provided in the middle of the bracket 401. One end of the slide rod 9 is connected to the middle of the slide shoe 5, and the other end passes through the cylinder 801 in the middle of the bottom plate 8, so as to make the slide rod 9 shuttle along the normal direction of the inclined surface of the slope frame 1; The slide rod 9 is sleeved in the first spring 10 , one end of the first spring 10 is connected to the lower surface of the base plate 8 , and the other end is connected to the upper surface of the slide shoe 5 , forming a return mechanism for making the slide shoe 5 rest against the surface of the conveyor belt 2 .

[0024] Generally, when the raw materials reach the entrance of the mixing barrel, they will be mixed with a drop for many times, and their moisture content is relatively uniform. The thickness distribution of the raw materials at the head and tail parts on the conveyor belt is poor, while the distribution in the middle part is better. Therefore, the detection device 4 is set at a position close to the discharge end.

[0025] In the preferred embodiment, the detection device 4 is also provided with a rotation limiting mechanism, and the rotation limiting rod 11 is arranged on one side of the sliding rod 9, one end of which is connected to the upper surface of the sliding shoe 5, and the other end passes through the limiting hole 802 on one side of the base plate 8, and the limiting hole 801 is adapted to the diameter of the rotation limiting rod 11 and its rotation radius.

[0026] The return mechanism and the rotation limit mechanism can enable the sliding shoe 5 to move up and down and rotate at a certain angle, so as to adapt to the gravel materials of different paving lengths and thicknesses on the conveying belt 3. The first spring 10 can increase the downward pressure of the sliding shoe 5 on the gravel to adapt to the gravel materials of different thicknesses, and at the same time restore the initial relative distance and angle between the sliding shoe 5 and the bottom plate 8 during non-working period; the rotation limit rod 11 passes through the arc through hole reserved on the bottom plate, and the sliding shoe 5 can rotate along the axis of the sliding rod 9, and the rotation angle is limited by the limit hole 802 on the bottom plate 8, which reduces the installation accuracy requirements of the detection device 4 and the impact of gravel on the mechanism, and adapts to the situation of asymmetric gravel stacking, the outer rib 501 is subjected to uneven force to turn the sliding shoe to the thicker gravel stacking.

[0027] In the preferred embodiment, the two ends of the sliding shoe 5 in the length direction are tilted upward relative to the main body of the steel plate, and the tilting angle is adapted to the size of the sandstone; The lower surface of the slipper 5 is also provided with an outer rib 501 and an inner rib 502. The outer rib 501 is symmetrically arranged along the center line of the length direction of the slipper 5. The two outer ribs 501 have a first width at the feeding end of the slipper 5, and gradually decrease along the length direction of the slipper 5 to form a second width in the middle of the slipper 5. The second width of the outer rib 501 remains unchanged and extends to the other end of the slipper 5.

[0028] In the preferred embodiment, the inner rib 502 is in a V-shaped structure, and is disposed in the middle of the bottom surface of the sliding shoe 5 and inside the two outer ribs 501, with the V-shaped tip facing the feeding end of the sliding shoe 5; The height of the inner ribs 502 is smaller than the height of the outer ribs 501 .

[0029] In the preferred embodiment, the moisture content sensor 6 is arranged at the rear side of the opening of the V-shaped structure of the inner rib 502, and its lower end passes through the lower surface of the sliding shoe 5 and extends to a distance equal to the height of the inner rib 502; The moisture content sensor 6 is a combination of one or more types of sensors, such as a resistive sensor, a capacitive sensor, a microwave sensor or an infrared sensor.

[0030] When the sand and gravel pass through the outer ribs 501, they will be gathered by the outer ribs 501 and flattened by the lower surface of the sliding shoe 5. The inner ribs 502 are in a V-shaped structure, which scrapes the surface of the gathered and flattened sand and gravel and guides them to both sides, so that the surface of the sand and gravel moisture content sensor contacts the inner sand and gravel, reducing the detection error caused by the evaporation of water on the sand and gravel surface during the transmission process. The moisture content sensor 6 is arranged behind the inner ribs 502 and at the same height as it, so as to prevent the sand and gravel from impacting the moisture content sensor 6 and causing damage to the instrument.

[0031] In a preferred embodiment, the displacement sensor 7 is a combination of one or more types of laser displacement sensors and ultrasonic sensors, and is disposed above the slide bar 9 through a housing 12 , with its sensing probe facing the upper end of the slide bar 9 .

[0032] In the preferred embodiment, a distance limiting nut 13 is further provided at the upper end of the slide rod 9, and a proximity switch 14 is provided on one side of the slide rod 9 on the inner wall of the shell 12. The height of the proximity switch 14 is adapted to the starting height of the slide shoe 5, and is used to determine whether the sand and gravel begin to pass through the slide shoe 5.

[0033] In a preferred embodiment, the detection device 4 is further provided with a microcomputer 15 , and the moisture content sensor 6 , the displacement sensor 7 , and the proximity switch 14 are electrically connected to the microcomputer 15 .

[0034] When the concrete mixing station equipment is started, the detection device 4 is powered on to automatically start the microcomputer 15, and detects the state of the proximity switch 14 in a timely manner. When the sand and gravel pass through the sliding shoe 5, the sliding shoe 5 is lifted by the sand and gravel and rises with the sliding rod 9, and the distance limit nut 13 is out of the sensing range of the proximity switch 14, triggering the falling edge signal, and the microcomputer 15 starts to collect data from the displacement sensor 7 and the moisture content sensor 6 at the same time; when all the sand and gravel have passed, the sliding shoe 5 returns to the initial position, and the distance limit nut 13 is in the sensing range of the proximity switch 14 again, and the microcomputer 15 ends data collection and calculates the sand and gravel specifications and moisture content data.

[0035] The method for determining the valid data interval of the detection device 4 is as follows: when the proximity switch 14 leaves the sensing interval, the distance data L and the sand and gravel moisture content data P recorded by the displacement sensor 7 are started to be recorded synchronously according to time; when the proximity switch 14 returns to the sensing interval, the data recording is stopped and data processing is started.

[0036] The collected distance data L is averaged every 0.1 seconds. Calculate, when K is less than 0.05 and greater than 0 three times in a row, record the time , when K is less than -0.05 for three consecutive times, record the time . In time +0.5 seconds and -Sand and gravel moisture content data within 0.5 seconds and distance data as a valid interval.

[0037] The method for determining the specifications and varieties of sand and gravel aggregate is as follows: Find the total average value, that is, the distance data Divide the data into sections every 0.1 meters and calculate the average value of the sections: ; Find the variance of the data in these valid intervals:

[0038] According to the above method, the variance data interval of various specifications of particle sizes is calibrated on the conveyor belt 2, and then the data calculated in time are adapted to the calibration data to feedback the aggregate particle size data currently conveyed by the conveyor belt 2.

[0039] Among them, the method for dealing with outliers is: assuming that the data follows a normal distribution , first calculate the mean of the data and standard deviation .

[0040] If the data point satisfies , then x is judged to be an outlier. For outliers, interpolation methods can be used to replace them, such as linear interpolation: Let the outlier value be , whose previous data point is , the next data point is , the replacement value is:

[0041] The algorithm for calculating the moisture content of sand and gravel is as follows: First, the moisture content data of the effective interval Arrange the data from small to large to form a distribution matrix , one row represents the moisture content value A, and the other row represents the number of data N, and the maximum value is taken , and then obtain the interval in The moisture content data P between the two, the moisture content mean calculation method is:

[0042] Example 2 Further illustrate with reference to Example 1, Figures 8 and 9 In the structure shown, a rotation limit rod 11 is arranged on both sides of the sliding rod 9, one end of each rotation limit rod 11 is connected to the upper surface of the sliding shoe 5, and the other end passes through the limiting hole 802 on one side of the base plate 8, and a shuttle ring 1101 is also provided on the rotation limit rod 11 below the base plate 8, and a second spring 1102 is sleeved on the rotation limit rod 11, one end of which is connected to the upper surface of the sliding shoe 5, and the other end is connected to the lower surface of the shuttle ring 1101, and the second spring 1102 drives the shuttle ring 1101 to rest against the lower surface of the base plate 8.

[0043] The sliding shoe 5 is pressed down together by the symmetrical second spring 1102 and the first spring 10, which ensures the close fit of the sliding shoe 5. At the same time, when sand and gravel pass under the sliding shoe 5, the end portion will not be lifted up due to the supporting force only distributed in the middle, thereby causing height detection error. By setting the shuttle ring 1101, the second spring 1102 can be squeezed and moved accordingly when the sliding shoe 5 is raised, and the rotation freedom of the rotation limit rod 11 is not restricted.

[0044] Example 3 Further illustrate with reference to Example 1, Fig.10 In the structure shown, the displacement sensor 7 is a combination of one or more of a Hall effect sensor, a magnetostrictive displacement sensor, and a linear displacement sensor, and its sensing element 701 is arranged in the slide rod 9, and the receiving end 702 is correspondingly arranged on the cylinder 801.

[0045] A distance limiting nut 13 is also provided at the upper end of the slide rod 9 , and a proximity switch 14 is provided at the upper end of the cylinder 801 , which is used to start the detection system when the proximity switch 14 is no longer in contact with the distance limiting nut 13 .

[0046] This embodiment reduces the provision of the housing 12 and selects a displacement detection element that can move with the slide bar 9. It has a compact structure and does not affect the displacement detection accuracy. It is a replacement solution with good performance.

[0047] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A real-time detection system for the moisture content and specifications of concrete raw material sand and gravel, characterized by: A conveyor belt (2) is provided on the slope frame (1); a driving mechanism (3) drives the conveyor belt (2) to rotate around the inclined surface of the slope frame (1) to drive the sand and gravel to climb; a detection device (4) is straddled on the slope frame (1); the detection device (4) comprises a sliding shoe (5), a return mechanism, a moisture content sensor (6) and a displacement sensor (7); the sliding shoe (5) abuts against the inclined surface of the conveyor belt (2); the moisture content sensor (6) faces the sand and gravel on the surface of the conveyor belt (2) and is used to detect the moisture content of the sand and gravel; the displacement sensor (7) faces the return mechanism and is used to detect the displacement change of the sliding shoe (5).

2. According to claim 1, a real-time detection system for moisture content and specifications of concrete raw material sand and gravel is characterized by: The driving mechanism (3) comprises a belt roller (301), a rotating bearing (302) and a driving motor (303); the belt roller (301) is rotatably connected to both ends of the ramp frame (1); rotating bearings (302) are provided on both sides of the upper belt roller (301); the output shaft of the driving motor (303) is connected to one side of the upper belt roller (301), driving the belt roller (301) to rotate, thereby driving the transport belt (2) to climb; The upper end point of the outer contour of the belt roller (301) is flush with the inclined surface of the ramp frame (1).

3. According to claim 1, a real-time detection system for moisture content and specifications of concrete raw material sand and gravel is characterized by: The detection device (4) is arranged on the upper end of the slope frame (1) through a bracket (401), at a position one-third of the length of the conveying belt (2) from the discharge port, and a bottom plate (8) is provided in the middle of the bracket (401). One end of the sliding rod (9) is connected to the middle of the sliding shoe (5), and the other end passes through the cylinder (801) in the middle of the bottom plate (8), so as to make the sliding rod (9) shuttle along the normal direction of the inclined surface of the slope frame (1); The slide bar (9) is sleeved in the first spring (10), one end of the first spring (10) is connected to the lower surface of the base plate (8), and the other end is connected to the upper surface of the slide shoe (5), forming a return mechanism for making the slide shoe (5) abut against the surface of the transport belt (2).

4. According to claim 3, a real-time detection system for moisture content and specifications of concrete raw material sand and gravel is characterized by: The detection device (4) is further provided with a rotation limiting mechanism, wherein the rotation limiting rod (11) is arranged on one side of the sliding rod (9), one end of which is connected to the upper surface of the sliding shoe (5), and the other end of which passes through a limiting hole (802) on one side of the bottom plate (8), wherein the limiting hole (801) is adapted to the diameter of the rotation limiting rod (11) and its rotation radius; Alternatively, the rotation limit rods (11) are arranged on both sides of the slide bar (9), one end of each rotation limit rod (11) is connected to the upper surface of the slide shoe (5), and the other end passes through the limit hole (802) on one side of the bottom plate (8), and a shuttle ring (1101) is also provided on the rotation limit rod (11) below the bottom plate (8), and the second spring (1102) is sleeved on the rotation limit rod (11), one end of which is connected to the upper surface of the slide shoe (5), and the other end of which is connected to the lower surface of the shuttle ring (1101), and the second spring (1102) drives the shuttle ring (1101) to abut against the lower surface of the bottom plate (8).

5. According to claim 1, a real-time detection system for moisture content and specifications of concrete raw material sand and gravel is characterized by: Two ends of the sliding shoe (5) in the length direction are tilted upward relative to the main body of the steel plate, and the tilting angle is adapted to the size of the sandstone; The lower surface of the sliding shoe (5) is further provided with an outer layer rib (501) and an inner layer rib (502), the outer layer rib (501) being symmetrically arranged along the center line of the length direction of the sliding shoe (5), the two outer layer ribs (501) having a first width at the feeding end of the sliding shoe (5), gradually decreasing along the length direction of the sliding shoe (5) to form a second width in the middle of the sliding shoe (5), the second width of the outer layer rib (501) remaining unchanged and extending to the other end of the sliding shoe (5).

6. According to claim 5, a real-time detection system for moisture content and specifications of concrete raw material sand and gravel is characterized by: The inner rib (502) is in a V-shaped structure and is arranged in the middle of the bottom surface of the sliding shoe (5) and inside the two outer ribs (501), with the V-shaped tip facing the feeding end of the sliding shoe (5); The height of the inner layer ribs (502) is smaller than the height of the outer layer ribs (501).

7. According to claim 1, a real-time detection system for moisture content and specifications of concrete raw material sand and gravel is characterized by: The moisture content sensor (6) is arranged at the rear side of the opening of the V-shaped structure of the inner rib (502), and its lower end passes through the lower surface of the sliding shoe (5) and extends to a distance equal to the height of the inner rib (502); The moisture content sensor (6) is a combination of one or more of a resistive sensor, a capacitive sensor, a microwave sensor or an infrared sensor.

8. According to claim 1, a real-time detection system for moisture content and specifications of concrete raw material sand and gravel is characterized by: The displacement sensor (7) is a combination of one or more of a laser displacement sensor and an ultrasonic sensor, and is arranged above the slide bar (9) through a housing (12), with its sensing probe facing the upper end of the slide bar (9); Alternatively, the displacement sensor (7) is a combination of one or more of a Hall effect sensor, a magnetostrictive displacement sensor, and a linear displacement sensor, wherein the sensing element (701) is arranged inside the slide bar (9), and the receiving end (702) is correspondingly arranged on the cylinder (801).

9. According to claim 1, a real-time detection system for moisture content and specifications of concrete raw material sand and gravel is characterized by: A distance limiting nut (13) is also provided at the upper end of the slide rod (9), and a proximity switch (14) is provided on one side of the slide rod (9) on the inner wall of the housing (12). The height of the proximity switch (14) matches the starting height of the slide shoe (5) and is used to determine whether the sandstone begins to pass through the slide shoe (5); Alternatively, a distance limiting nut (13) is further provided at the upper end of the slide rod (9), and a proximity switch (14) is provided at the upper end of the cylinder (801), for activating the detection system when the proximity switch (14) is no longer in contact with the distance limiting nut (13).

10. The real-time detection system for moisture content and specifications of concrete raw material sand and gravel according to claim 1, characterized in that: The detection device (4) is further provided with a microcomputer (15), and the moisture content sensor (6), the displacement sensor (7), and the proximity switch (14) are electrically connected to the microcomputer (15).

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