Real-time detection system for water content and size of concrete raw material sandstone

Abstract

The application provides a real-time detection system for water content and specification of concrete raw material sandstone, which is characterized by the following: a transport belt is arranged on a slope frame; a driving mechanism drives the transport belt to rotate around the inclined surface of the slope frame, thereby driving the sandstone to climb; a detection device is arranged on the slope frame; the detection device comprises a sliding shoe, a return mechanism, a water content sensor and a displacement sensor; the sliding shoe is arranged on the inclined surface of the transport belt; the water content sensor is arranged towards the sandstone on the surface of the transport belt, and is used for detecting the water content of the sandstone; and the displacement sensor is arranged towards the return mechanism, and is used for detecting the displacement change of the sliding shoe. The application solves the problems of large measurement error of the water content of the concrete raw material sandstone, damage to the sensor, and the inability to simultaneously measure the specification of the sandstone.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of construction concrete raw material detection, and particularly relates to a real-time detection system for water content and specification of concrete raw material sand and stone. BACKGROUND

[0002] In the production of concrete, sand and stone are one of the raw materials of concrete, and are produced by stirring according to a set mixing ratio. The water content of sand and stone is a key parameter, and the fluctuation of the water content will affect the slump, strength and impermeability of the concrete. When sand and stone are stored, they are often stacked in a storage bin and are affected by gravity. The water content in the upper layer of sand and stone will drop to the bottom of the storage bin, resulting in inconsistent water content of sand and stone in different parts of the storage bin. The water content of the top sand and stone is less than that of the bottom sand and stone. Therefore, timely detection of the water content and the accuracy of the data are of great significance to improving the quality of concrete. At present, the timely detection of the water content of some concrete mixing stations mainly adopts a contact method and a non-contact method.

[0003] The contact method is to insert a microwave sensor into sand and small-diameter aggregates to achieve online detection of the water content of sand and stone. Some detection methods are to insert a sensor into sand and stone on a conveying belt to collect data. The impact of sand and stone on the sensor is large during high-speed conveying, which can easily damage the sensor. For large-diameter aggregates, the sensor cannot be inserted into the aggregates, which causes the detection to be impossible. Some detection methods are to install a water content sensor on the wall of an aggregate bin. However, this method can only detect the water content of sand and stone in the layer and above the layer of the hopper, and cannot detect the water content of sand and stone below the sensor, which causes measurement errors. The non-contact method is to use an infrared moisture meter to collect data in cooperation with other technologies. This method mainly detects the water content on the surface of sand and stone. Generally, the concrete mixing barrel is far away from the raw material area. During the conveying process, the water on the surface of sand and stone evaporates, and the detection data of the water content also has errors.

[0004] At the same time, these detection methods cannot simultaneously detect the specification parameters of sand and stone, which makes the sand and stone quality detection process complicated and reduces the construction efficiency. SUMMARY

[0005] The main purpose of the present application is to provide a real-time detection system for the water content and specification of concrete raw material sand and stone, which solves the problems of large measurement error of the water content of concrete raw material sand and stone, easy damage to the sensor, and inability to simultaneously measure the specification of sand and stone.

[0006] To solve the above technical problems, the technical scheme adopted by the present application is: a real-time detection system for water content and specifications of concrete raw material sand and stone, a transport belt is arranged on the slope frame, a driving mechanism drives the transport belt to rotate around the inclined surface of the slope frame, driving the sand and stone to climb, a detection device is arranged on the slope frame, the detection device comprises a sliding shoe, a return mechanism, a water content sensor and a displacement sensor, the sliding shoe abuts against the inclined surface of the transport belt, the water content sensor faces the sand and stone on the surface of the transport belt and is used for detecting the water content of the sand and stone, and the displacement sensor faces the return mechanism and is used for detecting the displacement change of the sliding shoe.

[0007] In the preferred scheme, the driving mechanism comprises a belt roller, a rotating bearing and a driving motor, the belt roller is rotatably connected to the two ends of the slope frame, rotating bearings are arranged on the two sides of the upper end of the belt roller, the output shaft of the driving motor is connected to one side of the upper end of the belt roller, and the driving motor drives the belt roller to rotate, thereby driving the transport belt to climb;

[0008] The outer contour of the upper end of the belt roller is flush with the inclined surface of the slope frame.

[0009] In the preferred scheme, the detection device is arranged on the upper end of the slope frame through a support, at a position one third of the length of the transport belt away from the discharge port, a bottom plate is arranged in the middle of the support, one end of a sliding rod is connected to the middle of the sliding shoe, and the other end of the sliding rod passes through the middle cylinder of the bottom plate, so as to make the sliding rod shuttle along the normal direction of the inclined surface of the slope frame;

[0010] The sliding rod is sleeved in a first spring, one end of the first spring is connected to the lower surface of the bottom plate, and the other end of the first spring is connected to the upper surface of the sliding shoe, thereby constituting a return mechanism for making the sliding shoe abut against the surface of the transport belt.

[0011] In the preferred scheme, the detection device further comprises a rotary limiting mechanism, a rotary limiting rod is arranged on one side of the sliding rod, one end of the rotary limiting rod is connected to the upper surface of the sliding shoe, and the other end of the rotary limiting rod passes through a limiting hole on one side of the bottom plate, the diameter of the limiting hole and the rotary limiting rod and the rotary radius thereof are matched;

[0012] Alternatively, rotary limiting rods are arranged on the two sides of the sliding rod, one end of each rotary limiting rod is connected to the upper surface of the sliding shoe, and the other end of each rotary limiting rod passes through a limiting hole on one side of the bottom plate, a shuttle ring is further arranged on the rotary limiting rod below the bottom plate, a second spring is sleeved on the rotary limiting rod, one end of the second spring is connected to the upper surface of the sliding shoe, and the other end of the second spring is connected to the lower surface of the shuttle ring, so as to make the second spring drive the shuttle ring to abut against the lower surface of the bottom plate.

[0013] In the preferred scheme, the two ends of the sliding shoe in the length direction thereof are upwardly tilted relative to the main body of the steel plate, and the tilting angle thereof is matched with the size of the sand and stone.

[0014] The lower surface of the shoe is also provided with outer ribs and inner ribs, the outer ribs are symmetrically arranged along the center line of the shoe length direction, the two outer ribs have a first width at the material inlet end of the shoe, gradually decrease along the length direction of the shoe to form a second width at the middle part of the shoe, and the second width of the outer ribs remains unchanged and extends to the other end of the shoe.

[0015] In the preferred embodiment, the inner ribs are in V-shaped structure, arranged at the middle part of the bottom surface of the shoe inside the two outer ribs, and the V-shaped tip points to the material inlet end of the shoe.

[0016] The height of the inner ribs is less than that of the outer ribs.

[0017] In the preferred embodiment, the moisture content sensor is arranged at the back side of the opening of the V-shaped structure of the inner ribs, and the lower end thereof protrudes through the lower surface of the shoe by a distance equal to the height of the inner ribs.

[0018] The moisture content sensor is one or a combination of resistance sensor, capacitive sensor, microwave sensor or infrared sensor.

[0019] In the preferred embodiment, the displacement sensor is one or a combination of laser displacement sensor and ultrasonic sensor, and is arranged above the slide rod through the shell, with the sensing probe pointing to the upper end of the slide rod.

[0020] Alternatively, the displacement sensor is one or a combination of Hall effect sensor, magnetostrictive displacement sensor and linear displacement sensor, and the sensing element is arranged in the slide rod, with the receiving end correspondingly arranged on the cylinder.

[0021] In the preferred embodiment, the upper end of the slide rod is also provided with a distance limiting nut, and the inner wall of the shell on one side of the slide rod is provided with a proximity switch, the height of the proximity switch is matched with the starting height of the shoe, and the proximity switch is used to determine the start of the sand and gravel passing through the shoe.

[0022] Alternatively, the upper end of the slide rod is also provided with a distance limiting nut, and the upper end of the cylinder is provided with a proximity switch, which is used to start the detection system when the proximity switch is no longer in contact with the distance limiting nut.

[0023] In the preferred embodiment, the detection device is also provided with a microcomputer, and the moisture content sensor, displacement sensor and proximity switch are electrically connected with the microcomputer.

[0024] The application provides a real-time detection system for water content and specification of concrete raw material sandstone, a transport belt is arranged on a slope frame, a driving mechanism drives the transport belt to rotate around the inclined surface of the slope frame, and the sandstone is driven to climb, a detection device is arranged on the slope frame, when the sandstone passes through the detection device 4 through conveying, the sandstone is gathered and flattened by the ribs at the bottom of the sliding shoe 5, and then the surface sandstone is scraped, and then the sandstone passes through a sandstone water content sensor, meanwhile, the sliding shoe 5 is raised by the sandstone, the relative height of the sliding shoe 5 and the water content data of the sandstone are collected in real time, the specification and water content data of the sandstone are calculated through the fluctuation range of the relative height of the sliding shoe and the effective detection data algorithm of the water content of the sandstone, and the upper system is pushed. The structure is simple and convenient to install, can be used by being simply installed on the frame of the conveying belt, the original sandstone conveying system does not need to be changed, a plurality of sensors arranged in a plurality of raw material bins in the traditional mixing station are greatly reduced, and the use cost is reduced. The device completes self-adaptation of the raw material variety and the particle size and the initial selection of the effective area of the sandstone detection through the structural characteristics, the problem of residual soil on the surface of the sensor in other detection methods is solved through the friction between the sandstone and the sensor, the effectiveness of the water content data is determined through the distance data interval, the specification of the sandstone aggregate is determined through the distance data fluctuation, the original water content data is processed through the mean value algorithm, the accuracy of the data is greatly improved, the problem that the water content measurement error of the concrete raw material sandstone is large, the sensor is easily damaged and the specification of the sandstone cannot be measured at the same time is solved. BRIEF DESCRIPTION OF DRAWINGS

[0025] The application will be further described below in combination with the drawings and examples:

[0026] Figure 1 is the overall appearance of the application. Axonometric structure diagram;

[0027] Figure 2 is the overall appearance of the application. Side view structure diagram;

[0028] Figure 3 is the driving mechanism structure diagram of the application;

[0029] Figure 4 is the side view structure diagram of the detection device of example 1 of the application;

[0030] Figure 5 is the shell cross-sectional structure diagram of the detection device of example 1 of the application;

[0031] Figure 6 is the bottom structure diagram of the sliding shoe of the application;

[0032] Figure 7 is the side view structure diagram of the sliding shoe of the application;

[0033] Figure 8 is the front view structure diagram of the detection device of example 2 of the application;

[0034] Figure 9 is the top view structural diagram of the detection device of embodiment 2 of the present application;

[0035] Figure 10 is the front view structural diagram of the detection device of embodiment 3 of the present application;

[0036] Figure 11 is the system running flow chart of the present application.

[0037] In the figure: slope frame 1; transport belt 2; driving mechanism 3; belt roller 301; rotating bearing 302; driving motor 303; detection device 4; support 401; sliding shoe 5; outer layer rib 501; inner layer rib 502; water 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; rotary limiting rod 11; shuttle ring 1101; second spring 1102; shell 12; distance limiting nut 13; proximity switch 14; microcomputer 15. DETAILED DESCRIPTION

[0038] Embodiment 1

[0039] As shown in Figures 1-7 , 11, a real-time detection system for water content and specification of concrete raw material sand and stone, a slope frame 1 is provided with a transport belt 2, a driving mechanism 3 drives the transport belt 2 to rotate around the inclined surface of the slope frame 1, and drives the sand and stone to climb, a detection device 4 is arranged across the slope frame 1, the detection device 4 comprises a sliding shoe 5, a return mechanism, a water content sensor 6 and a displacement sensor 7, the sliding shoe 5 abuts against the inclined surface of the transport belt 2, the water content sensor 6 faces the surface sand and stone of the transport belt 2 and is used for detecting the water content of the sand and stone, and the displacement sensor 7 faces the return mechanism and is used for detecting the displacement change of the sliding shoe 5.

[0040] The detection device 4 of the present application is fixed on the transport belt 2 of a concrete mixing station and is located close to the discharge port of the transport belt 2 of the mixing station. When the sand and stone passes through the detection device 4, the sand and stone is gathered by the outer layer rib 501 at the bottom of the sliding shoe 5, is flattened, and the surface sand and stone is scraped by the inner layer rib 502, and then passes through the water content sensor 6 of the sand and stone. The sand and stone raises the sliding shoe 5, triggers the system to collect the relative height of the sliding shoe 5 and the water content data of the sand and stone in real time, calculates the specification and water content data of the sand and stone in real time through the fluctuation range of the relative height of the sliding shoe and the effective detection data algorithm of the water content of the sand and stone, and pushes the data to the upper system.

[0041] In the preferred embodiment, 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 the two ends of the slope frame 1. The rotating bearing 302 is arranged on the two sides of the upper end of the belt roller 301. The output shaft of the driving motor 303 is connected to one side of the upper end of the belt roller 301. The driving motor 303 drives the belt roller 301 to rotate, thereby driving the transport belt 2 to climb.

[0042] The outer contour of the upper end of the belt roller 301 is flush with the inclined surface of the slope frame 1.

[0043] The climbing surface of the transport belt 2 is flush with the inclined surface of the slope frame 1, so that the sandstone can be closely abutted on the surface to be measured during the climbing process, and the fluctuation error caused by the two ends of the transport belt 2 being pulled up can be avoided.

[0044] In the preferred embodiment, the detection device 4 is arranged on the upper end of the slope frame 1 through a support 401, and is located at a position one third of the length of the transport belt 2 away from the discharge port. A bottom plate 8 is arranged in the middle of the support 401. One end of a sliding rod 9 is connected to the middle of the sliding shoe 5, and the other end of the sliding rod 9 penetrates through a cylinder 801 in the middle of the bottom plate 8, so as to enable the sliding rod 9 to move along the normal direction of the inclined surface of the slope frame 1.

[0045] The sliding rod 9 is sleeved in a first spring 10. One end of the first spring 10 is connected to the lower surface of the bottom plate 8, and the other end of the first spring 10 is connected to the upper surface of the sliding shoe 5, thereby constituting a return mechanism for enabling the sliding shoe 5 to abut on the surface of the transport belt 2.

[0046] Generally, the raw materials will pass through the mixing with a drop difference for multiple times when they reach the inlet of the stirring barrel, and the water content of the raw materials is relatively uniform. The thickness distribution of the raw materials on the conveying belt is poor at the head and tail portions, and is good at the middle portion. Therefore, the detection device 4 is arranged at a position close to the discharge end.

[0047] In the preferred embodiment, the detection device 4 further comprises a rotary limiting mechanism. A rotary limiting rod 11 is arranged on one side of the sliding rod 9. One end of the rotary limiting rod 11 is connected to the upper surface of the sliding shoe 5, and the other end of the rotary limiting rod 11 penetrates through a limiting hole 802 on one side of the bottom plate 8. The diameter of the rotary limiting rod 11 and the rotary radius thereof are matched with the limiting hole 802.

[0048] The return mechanism and the rotation limiting mechanism can make the sliding shoe 5 have the functions of moving up and down and rotating at a certain angle, so as to adapt to different paving lengths and thicknesses of the gravel on the conveying belt 2. The first spring 10 can increase the downward pressure of the sliding shoe 5 on the gravel, so as to adapt to different thicknesses of the gravel, and at the same time, the initial relative distance and angle of the sliding shoe 5 to the bottom plate 8 during non-working period are restored. The rotation limiting rod 11 passes through the arc-shaped through hole reserved on the bottom plate, the sliding shoe 5 can rotate along the axis of the sliding rod 9, and the rotation angle is limited by the limiting hole 802 on the bottom plate 8, which reduces the installation precision requirement of the detection device 4 and the impact of the gravel on the mechanism, and adapts to the case that the outer layer rib 501 is unbalancedly stressed to make the sliding shoe turn to the thicker gravel pile under the condition of the non-symmetrical thickness of the gravel pile.

[0049] In the preferred embodiment, the two ends of the sliding shoe 5 in the length direction are upwardly tilted relative to the main body part of the steel plate, and the tilting angle is adapted to the size of the gravel;

[0050] 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 is symmetrically arranged along the center line of the length direction of the sliding shoe 5. The two outer layer ribs 501 have a first width at the material inlet end of the sliding shoe 5, gradually decrease along the length direction of the sliding shoe 5 to form a second width at the middle part of the sliding shoe 5, and the second width of the outer layer rib 501 remains unchanged and extends to the other end of the sliding shoe 5.

[0051] In the preferred embodiment, the inner layer rib 502 has a V-shaped structure and is arranged inside the two outer layer ribs 501 at the middle part of the bottom surface of the sliding shoe 5. The V-shaped tip of the inner layer rib 502 faces the material inlet end of the sliding shoe 5.

[0052] The height of the inner layer rib 502 is less than the height of the outer layer rib 501.

[0053] 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 layer rib 502, and the lower end of the moisture content sensor 6 penetrates through the lower surface of the sliding shoe 5 and protrudes by a distance equal to the height of the inner layer rib 502.

[0054] The moisture content sensor 6 is one or a combination of a resistance sensor, a capacitive sensor, a microwave sensor or an infrared sensor.

[0055] When the gravel passes through the outer layer rib 501, the gravel is gathered by the outer layer rib 501 and flattened by the lower surface of the sliding shoe 5. The inner layer rib 502 has a V-shaped structure, which scrapes and guides the flattened gravel to both sides, so that the surface of the gravel contacts the inner layer gravel, reducing the detection error caused by the evaporation of water on the surface of the gravel during the conveying process. The moisture content sensor 6 is arranged behind the inner layer rib 502 and has the same height as the inner layer rib 502, so as to avoid the impact of the gravel on the moisture content sensor 6 and damage the instrument.

[0056] In the preferred embodiment, the displacement sensor 7 is a combination of one or more of a laser displacement sensor, an ultrasonic sensor, and is arranged above the slide rod 9 by the housing 12, with the sensing probe facing the upper end of the slide rod 9.

[0057] In the preferred embodiment, the upper end of the slide rod 9 is further provided with a distance limiting nut 13, and the inner wall of the housing 12 on one side of the slide rod 9 is provided with a proximity switch 14, the height of which is matched with the starting height of the slide shoe 5, for determining when the sand and gravel starts to pass through the slide shoe 5.

[0058] In the preferred embodiment, the detection device 4 is further provided with a microcomputer 15, and the water content sensor 6, the displacement sensor 7, and the proximity switch 14 are electrically connected to the microcomputer 15.

[0059] When the concrete mixing plant equipment is started, the microcomputer 15 of the detection device 4 is automatically started, and the state of the proximity switch 14 is detected in a timely manner. When the sand and gravel passes through the slide shoe 5, the slide shoe 5 is lifted by the sand and gravel and the slide rod 9 is raised, the distance limiting nut 13 is out of the sensing range of the proximity switch 14, a falling edge signal is triggered, and the microcomputer 15 starts to collect data of the displacement sensor 7 and the water content sensor 6 at the same time. When the sand and gravel passes through completely, the slide shoe 5 returns to the initial position, the distance limiting nut 13 is in the sensing range of the proximity switch 14 again, and the microcomputer 15 ends the data collection and calculates the size and water content data of the sand and gravel.

[0060] The data effective range determination method of the detection device 4 is as follows: when the proximity switch 14 is out of the sensing range, the distance data L recorded by the displacement sensor 7 and the water content data P of the sand and gravel are recorded synchronously according to time, and when the proximity switch 14 returns to the sensing range, the data recording is stopped and data processing is started.

[0061] The distance data L collected is segmented and averaged every 0.1 second, and the average value is calculated according to the formula: When K is less than 0.05 and greater than 0 for three consecutive times, the time is recorded. When K is less than -0.05 for three consecutive times, the time is recorded. The water content data and the distance data within the time +0.5 seconds and

[0062] -0.5 seconds are taken as the effective range. The size and variety determination method of the sand and gravel aggregate is as follows: the distance data L is segmented every 0.1 meter, and the segmented average value is calculated:

[0063] ;

[0064] Calculate the variance of the data for these valid intervals:

[0065]

[0066] According to the above method, the variance data range of various particle sizes is calibrated on the conveyor belt 2. Subsequently, the data calculated in time is matched with the calibration data to provide feedback on the current aggregate particle size data conveyed by the conveyor belt 2.

[0067] The method for handling outliers is as follows: assume that the data follows a normal distribution. First, calculate the mean of the data. and standard deviation .

[0068] If the data points satisfy If x is an outlier, then x is considered an outlier. Outliers can be replaced using interpolation methods, such as linear interpolation.

[0069] Let the outlier value be The previous data point is The next data point is The replacement value is:

[0070]

[0071] The algorithm for calculating the moisture content of sand and gravel is as follows: First, the moisture content data of the effective range is... Arrange the data in ascending order and form a distribution matrix based on the number of data points. One row represents the moisture content value A, and the other row represents the number of data points N. The maximum number of data points is taken. Then obtain the interval in The moisture content data P between the two points, and the method for calculating the mean moisture content, are as follows:

[0072]

[0073] Example 2

[0074] Further explanation in conjunction with Example 1, such as Figures 8-9 As shown in the structure, the rotating limiting rods 11 are arranged on both sides of the slide rod 9. One end of each rotating limiting rod 11 is connected to the upper surface of the slide shoe 5, and the other end passes through the limiting hole 802 on one side of the base plate 8. A shuttle ring 1101 is also provided on the rotating limiting rod 11 below the base plate 8. The second spring 1102 is sleeved on the rotating limiting rod 11, with one end connected to the upper surface of the slide shoe 5 and the other end connected to the lower surface of the shuttle ring 1101. The second spring 1102 drives the shuttle ring 1101 to abut against the lower surface of the base plate 8.

[0075] The common pressing of the slide shoe 5 by the second springs 1102 symmetrically arranged on both sides and the first spring 10 ensures the close contact of the slide shoe 5, and when the sand and stones pass below the slide shoe 5, the end part is not lifted up due to the distribution of the abutting force only in the middle part, thereby causing the height detection error. The shuttle ring 1101 is arranged to enable the second spring 1102 to be pressed and moved when the slide shoe 5 is lifted up, and the rotation freedom of the rotation limiting rod 11 is not limited.

[0076] Embodiment 3

[0077] Further illustrated in combination with Embodiment 1, as shown in the structure, 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 the sensing element 701 thereof is arranged in the slide rod 9, and the receiving end 702 is correspondingly arranged on the cylinder 801. Figure 10

[0078] The upper end of the slide rod 9 is further provided with a distance limiting nut 13, and the upper end of the cylinder 801 is provided with a proximity switch 14, which is used to start the detection system when the proximity switch 14 is no longer in contact with the distance limiting nut 13.

[0079] This embodiment reduces the arrangement of the shell 12, selects the displacement detection element that can move with the slide rod 9, has a compact structure, does not affect the displacement detection precision, and is a good replacement scheme.

[0080] The above embodiments are only preferred technical solutions of the present application, and should not be regarded as a limitation of the present application. The protection scope of the present application should be the technical solutions recited in the claims, and the equivalent replacement solutions of the technical features recited in the claims are within the protection scope. That is, the equivalent replacement improvements within this range are also within the protection scope of the present application.​

Claims

1. A real-time detection system for the moisture content and specifications of concrete raw materials (sand and gravel), characterized in that: The slope frame (1) is provided with a conveying belt (2), a driving mechanism (3) drives the conveying belt (2) to rotate around the inclined surface of the slope frame (1), drives the sandstone to climb, and a detection device (4) is arranged 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) is abutted on the inclined surface of the conveying belt (2); the lower end of the moisture content sensor (6) penetrates through the lower surface of the sliding shoe (5) and is directed to the sandstone on the surface of the conveying belt (2), and is used for detecting the moisture content of the sandstone; The displacement sensor (7) is directed to the return mechanism, and is used for detecting the displacement change of the relative height of the sliding shoe (5); During detection, the sandstone lifts the sliding shoe (5), and the system collects the relative height of the sliding shoe (5) and the moisture content of the sandstone in real time.

2. The real-time detection system for the moisture content and size of raw concrete aggregate according to claim 1, characterized in that: 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 the two ends of the slope frame (1); the upper end of the belt roller (301) is provided with the rotating bearing (302) on the two sides; the output shaft of the driving motor (303) is connected to one side of the upper end of the belt roller (301); the driving motor (303) drives the belt roller (301) to rotate, and drives the conveying belt (2) to climb. The outer contour upper end point of the belt roller (301) is flush with the inclined surface of the slope frame (1).

3. The real-time detection system for water content and size of raw material sand and gravel of concrete according to claim 1, characterized in that: The detection device (4) is arranged on the upper end of the slope frame (1) through a support (401) at a position of one third of the length of the conveying belt (2) away from the discharge port; the middle part of the support (401) is provided with a bottom plate (8); one end of a sliding rod (9) is connected to the middle part of the sliding shoe (5), and the other end penetrates through a cylinder (801) in the middle part of the bottom plate (8), so that the sliding rod (9) moves along the normal direction of the inclined surface of the slope frame (1). The sliding rod (9) is sleeved in a first spring (10); one end of the first spring (10) is connected to the lower surface of the bottom plate (8), and the other end is connected to the upper surface of the sliding shoe (5), so as to form a return mechanism, and the sliding shoe (5) is abutted on the surface of the conveying belt (2).

4. The real-time detection system for water content and size of raw material sand and gravel of concrete according to claim 3, characterized in that: The detection device (4) is further provided with a rotary limiting mechanism; a rotary limiting rod (11) is arranged on one side of the sliding rod (9); one end of the rotary limiting rod (11) is connected to the upper surface of the sliding shoe (5), and the other end penetrates through a limiting hole (802) on one side of the bottom plate (8); the limiting hole (802) is matched with the diameter of the rotary limiting rod (11) and the rotating radius thereof. Alternatively, the rotary limiting rod (11) is arranged on the two sides of the sliding rod (9); one end of each rotary limiting rod (11) is connected to the upper surface of the sliding shoe (5), and the other end penetrates through the limiting hole (802) on one side of the bottom plate (8); a shuttle ring (1101) is further arranged on the rotary limiting rod (11) below the bottom plate (8); a second spring (1102) is sleeved on the rotary limiting rod (11); one end of the second spring (1102) 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); the second spring (1102) drives the shuttle ring (1101) to abut on the lower surface of the bottom plate (8).

5. The real-time detection system for water content and size of raw material sand and gravel of concrete according to claim 1, characterized in that: The two ends of the sliding shoe (5) in the length direction are upwardly tilted relative to the main body of the steel plate, and the tilting angle is matched with the size of the sandstone. The lower surface of the sliding shoe (5) is further provided with outer ribs (501) and inner ribs (502). The outer ribs (501) are symmetrically arranged along the center line of the length direction of the sliding shoe (5). The two outer ribs (501) have a first width at the material inlet end of the sliding shoe (5), gradually decrease along the length direction of the sliding shoe (5) to form a second width at the middle part of the sliding shoe (5), and the second width of the outer ribs (501) remains unchanged and extends to the other end of the sliding shoe (5).

6. The real-time detection system for water content and size of raw material sand and gravel of concrete according to claim 5, characterized in that: The inner ribs (502) are in V-shaped structure and are arranged at the middle part of the bottom surface of the sliding shoe (5) and the inner side of the two outer ribs (501), with the V-shaped tip pointing to the material inlet end of the sliding shoe (5). The height of the inner ribs (502) is less than that of the outer ribs (501).

7. The real-time detection system for water content and size of raw material sand and gravel of concrete according to claim 6, characterized in that: The moisture content sensor (6) is arranged at the rear side of the opening of the V-shaped structure of the inner ribs (502), with the lower end penetrating through the lower surface of the sliding shoe (5) and extending out by a distance equal to the height of the inner ribs (502). The moisture content sensor (6) is one or a combination of resistance sensor, capacitive sensor, microwave sensor or infrared sensor.

8. The real-time detection system for water content and size of raw material sand and gravel of concrete according to claim 3, characterized in that: The displacement sensor (7) is one or a combination of laser displacement sensor and ultrasonic sensor, and is arranged above the sliding rod (9) through the shell (12), with the sensing probe pointing to the upper end of the sliding rod (9). Alternatively, the displacement sensor (7) is one or a combination of Hall effect sensor, magnetostrictive displacement sensor and linear displacement sensor, with the sensing element (701) arranged in the sliding rod (9) and the receiving end (702) correspondingly arranged on the cylinder (801).

9. The real-time detection system for water content and size of raw material sand and gravel of concrete according to claim 8, characterized in that: The upper end of the sliding rod (9) is further provided with a distance limiting nut (13), and the inner wall of the shell (12) on one side of the sliding rod (9) is provided with a proximity switch (14), the height of which is matched with the starting height of the sliding shoe (5), for judging the start of the sand and stone passing through the sliding shoe (5). Alternatively, the upper end of the sliding rod (9) is further provided with a distance limiting nut (13), and the upper end of the cylinder (801) is provided with a proximity switch (14), for starting 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 water content and size of raw material sand and gravel of concrete according to claim 9, 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 with the microcomputer (15).

Images