Mixing plant sampling device

Abstract

The present invention relates to the field of concrete processing, and specifically discloses a sampling device for a mixing station, which includes a first conveying unit vertically connected in sequence and communicating with the mixing station and a second conveying unit capable of communicating with a tank truck, and further includes a connecting sampling unit connected between the first conveying unit and the second conveying unit. The connecting sampling unit includes a sampling cylinder and a feeding cylinder vertically connected to the first conveying unit and the second conveying unit. A feeding port is provided on the side wall of the feeding cylinder. The side wall of the sampling cylinder is rotatably installed at the feeding port of the feeding cylinder. A sampling port communicating with the upper end of the feeding cylinder is provided at the upper end of the sampling cylinder. A rotating unit for controlling the intermittent flipping of the sampling cylinder is provided between the sampling cylinder and the feeding cylinder. This solution can complete the detection of concrete before it is filled into the tank truck, ensuring that the tank truck can be used immediately after transporting the concrete to the construction site, making the use of concrete more convenient; at the same time, it also reduces the difficulty of sampling concrete.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete processing, and particularly to a sampling device for a mixing station. Background Art

[0002] After the concrete is mixed in the mixing station, it is necessary to connect the discharge port of the mixing station with the concrete tanker. After the feeding is completed, it is transferred to the construction site for continuous mixing and use. Before that, it is necessary to sample and detect the concrete in the concrete tanker to detect the slump, workability and density of the concrete. When sampling, generally, the concrete is unloaded and sampled from the middle and rear of the tanker. The workability and representativeness of the concrete sampled from the tail are not strong, which affects the strength test results after the concrete is formed.

[0003] At the same time, after the sampling is completed, when the detection is unqualified, it is difficult to add the components required for concrete manufacturing to the tanker to meet the slump, workability and density of the concrete, which easily leads to uneven mixing of the concrete. At the same time, it is necessary to sample and detect multiple times, and the sampled concrete after detection is also easy to cause waste and is not environmentally friendly. Therefore, now before the concrete is filled into the tanker, the concrete in the mixing station is sampled and detected to ensure that the concrete at the time of filling is qualified in performance.

[0004] However, the amount of concrete in the mixing station is large, and the mixing station also has a very large capacity for concrete. It is difficult to directly sample the concrete in the mixing station, and the sampling efficiency is low. At the same time, in the existing mixing stations, the volume and structure are all huge. If a manual sampling mechanism is used to control the sampling, it is difficult to sample the concrete sequentially in stages, and the sampling efficiency is low. Summary of the Invention

[0005] Aiming at the deficiencies in the prior art, the present invention provides a sampling device for a mixing station to solve the problems of low concrete sampling efficiency and difficulty in sampling sequentially in stages when sampling concrete on the mixing station.

[0006] To achieve the above object, the basic scheme of the present invention is as follows: A sampling device for a mixing station includes a first conveying unit vertically connected in sequence and communicating with the mixing station and a second conveying unit capable of communicating with the tanker, and further includes a communicating sampling unit connected between the first conveying unit and the second conveying unit. The communicating sampling unit includes a sampling cylinder and a guiding cylinder vertically communicating with the first conveying unit and the second conveying unit. An inlet is provided on the side wall of the guiding cylinder. The side wall of the sampling cylinder is rotatably installed at the inlet of the guiding cylinder. A sampling port communicating with the upper end of the guiding cylinder is provided at the upper end of the sampling cylinder. A rotating unit for controlling the intermittent flipping of the sampling cylinder is provided between the sampling cylinder and the guiding cylinder.

[0007] The technical principle of the present invention is as follows: When sampling concrete, the first conveying unit is started, so that the concrete in the mixing station enters the guide cylinder and the second conveying unit. At this time, the sampling port at the upper end of the sampling cylinder is located inside the feed port of the guide cylinder, and part of the concrete enters the sampling cylinder through the sampling port at the upper end of the sampling cylinder. When the sampling cylinder is filled with concrete, the excess concrete will overflow from the sampling cylinder and be continuously conveyed by the guide cylinder and the connecting hopper to the second hopper; when the sampling cylinder is filled, the rotating unit is started to flip the sampling cylinder, so that the sampling port at the upper end of the sampling cylinder moves out of the feed port, and then the concrete is taken out from the sampling port for detection. It can quickly realize the rapid sampling of concrete during the process of conveying concrete, and the sampling efficiency is high.

[0008] When intermittent sampling is required, the rotating unit is started to move the sampling port at the upper end of the sampling cylinder back into the feed port of the guide cylinder again, and sampling can be carried out here. Multiple sampling operations can be performed according to requirements to ensure the detection accuracy of concrete and the mixing and processing accuracy; after detection, the qualified concrete is poured back into the guide cylinder and the second conveying unit through the feed port to realize the recycling of concrete.

[0009] In the above process, the detection of concrete can be completed before the concrete is filled into the tanker, ensuring that the concrete can be used immediately when the tanker transports the concrete to the construction site, making the use of concrete more convenient; at the same time, it also reduces the difficulty of sampling concrete.

[0010] Furthermore, the rotating unit includes a telescopic cylinder with intermittent expansion and contraction and a handle. The handle passes through the guide cylinder and is fixedly connected to the side wall of the sampling cylinder. The handle is rotatably connected to the guide cylinder. One end of the telescopic cylinder is rotatably connected to the handle, and the other end of the telescopic cylinder is rotatably connected to the outer wall of the guide cylinder. The rotation axes between the telescopic cylinder and the guide cylinder, between the telescopic cylinder and the handle, and between the guide cylinder and the sampling cylinder are all parallel.

[0011] Through the above settings, when intermittently sampling concrete, controlling the telescopic cylinder to extend or contract can drive the handle to rotate relative to the side wall of the guide cylinder, and then synchronously drive the sampling cylinder to rotate relative to the feed port of the guide cylinder, facilitating the control of the connection between the sampling port and the feed port on the sampling cylinder, facilitating the control of the sampling timing, and also facilitating multiple samplings.

[0012] Furthermore, it further includes a material receiving and detecting unit. The material receiving and detecting unit includes a slide rail, a material receiving box, and a slider for driving the material receiving box to slide horizontally on the slide rail; the slide rail is horizontally arranged and opposite to the sampling cylinder. The axis of the slide rail is parallel to the side wall of the guide cylinder close to the sampling cylinder. A switch port is provided at the lower end of the sampling cylinder, and the upper end of the material receiving box is an open port that can be opposite to the switch port.

[0013] Through the above arrangement, when the sampling tube completes sampling, the switch port at the lower end of the sampling tube is opposite to the open port of the receiving box. At this time, the switch port is controlled to open, so that the concrete in the sampling tube can enter the receiving box, which is convenient for taking concrete from the receiving box for testing; at the same time, when sampling is performed multiple times, the receiving box on the sliding rail is slid so that the next receiving box is opposite to the switch port of the sampling tube, which is convenient for receiving and testing another concrete sample, and can adapt to multiple concrete sampling.

[0014] Furthermore, the first conveying unit includes a first hopper and a first switch valve for controlling the connection or closing of the lower end of the first hopper with the material guide cylinder. The first switch valve is fixedly installed between the first hopper and the upper end of the material guide cylinder. The upper end of the first hopper is connected to the mixing station.

[0015] Through the above arrangement, the first switch valve can be used to quickly control the concrete from the mixing station to enter the first hopper, the material guide cylinder and the second conveying unit, so that sampling operations can be performed from the material guide cylinder.

[0016] Furthermore, the second conveying unit includes a second hopper and a connecting hopper located between the upper end of the second hopper and the lower end of the material guide cylinder. The connecting hopper is coaxially fixed on the lower end of the material guide cylinder. The connecting hopper is located in the second hopper, and the cross-sectional diameter of the connecting hopper decreases from top to bottom. A second switch valve for controlling the opening or closing of the second hopper is provided at the lower end of the second hopper.

[0017] Through the above arrangement, the timing of concrete entering the tank truck can be controlled through the second switch valve, which is convenient for concrete filling; at the same time, the setting of connecting the hopper can allow the concrete in the guide barrel to enter the second hopper and the tank truck more stably.

[0018] Furthermore, it also includes a return rail located at the lower side of the material receiving box, which is fixedly installed on the side of the material guide barrel or the second hopper close to the sampling barrel. The return rail is provided with a return groove that can be connected to the material guide barrel or the second hopper. The bottom surface of the return groove is an inclined surface, and the lowest point of the bottom surface of the return groove is close to the material guide barrel or the second hopper.

[0019] Through the above arrangement, after the concrete inspection is completed, the qualified concrete samples are placed in the reflux groove of the reflux rail, and the reflux groove guides the concrete to the guide barrel and the second hopper to realize the filling of the concrete samples and avoid the waste of concrete.

[0020] Furthermore, a hydrophobic layer is fixedly laid on the bottom surface of the material receiving box, and installation grooves are horizontally arranged on the opposite side walls of the material receiving box. Moving blocks are horizontally slidably installed in the installation grooves, and a scraper is connected between the two moving blocks. The scraper is against the upper surface of the hydrophobic layer, and the moving path of the moving block is perpendicular to the side wall of the material guide barrel.

[0021] With the above settings, after the concrete test is completed, the qualified concrete samples are put back into the material receiving box. Then, hold the side of the material receiving box away from the return rail, with the other side of the material receiving box close to the return groove of the return rail, so that the concrete in the material receiving box slides down through the hydrophobic layer into the return groove of the return rail. The hydrophobic layer can enhance the return speed of the concrete. At the same time, move the scraping blade along the installation groove. The scraping blade drives the moving block to move in the installation groove, and the concrete remaining on the hydrophobic layer of the scraping blade part is transferred into the return groove, realizing the full recovery of the concrete and reducing the residual amount of concrete in the material receiving box.

[0022] Furthermore, a chute is provided in the slide rail. A convex strip is fixedly provided at the bottom of the chute of the slide rail. The longitudinal section of the slider is in an inverted "concave" shape, and the convex strip is embedded into the slider. The outer wall of the lower end of the slider and the outer wall of the upper end of the slide rail are both in an arc shape.

[0023] With the above settings, when the material receiving box is flipped so that the side wall of the material receiving box is close to the return groove, the "concave" structure of the convex strip and the slider can cooperate, and the outer wall of the lower end of the slider and the outer wall of the upper end of the slide rail cooperate, so that the material receiving box on the slide rail can be smoothly flipped close to the return groove.

[0024] Furthermore, a discharge port communicating with the material receiving box is provided on one side of the material receiving box close to the guide cylinder. A baffle for closing the discharge port is hinged on the upper side of the discharge port of the material receiving box, and the discharge port can be opposite to the return groove.

[0025] With the above settings, when the material receiving box on the slide rail is flipped close to the return groove, the baffle remains in a vertical state under the action of its own gravity. Then, the baffle rotates relative to the upper side of the discharge port of the material receiving box to achieve separation, and the discharge port is opposite to the return groove, facilitating the concrete in the material receiving box to quickly slide down through the discharge port into the return groove of the return rail, and the recovery is faster.

[0026] Furthermore, a ring-shaped scale line is shown on the hydrophobic layer, and the ring-shaped scale line is coaxially arranged with the bottom surface of the material receiving box.

[0027] With the above settings, the hydrophobic layer can accelerate the recovery of qualified concrete. At the same time, when the concrete in the sampling cylinder drops onto the hydrophobic layer, the slump condition of the concrete can be roughly checked through the ring-shaped scale line. If it is basically qualified, subsequent tests can be carried out to improve the test efficiency. Description of the Drawings

[0028] Figure 1 It is a partial cross-sectional view in the main viewing direction of the sampling device in the mixing station in the embodiment of the present invention.

[0029] Figure 2 It is Figure 1 an enlarged view of the material receiving and detecting unit and the return rail in

[0030] In the above-mentioned drawings: the first hopper 10, the second hopper 20, the material guiding cylinder 30, the connecting hopper 301, the feeding port 302, the material taking cylinder 40, the sampling port 401, the switch port 402, the handle 403, the telescopic cylinder 404, the return rail 50, the return groove 501, the slide rail 60, the material receiving box 601, the hydrophobic layer 602, the discharge port 603, the installation groove 604, the moving block 605, the scraping blade 606, the slider 607, the rib 608, the baffle 609, the counterweight 610. Detailed implementation manners

[0031] The technical solutions in the present invention will be further described below in conjunction with the drawings and embodiments.

[0032] This embodiment is basically as Figure 1 and Figure 2 shown. An embodiment of the present invention provides a sampling device for a mixing plant, which includes a first conveying unit connected to the mixing plant and a second conveying unit capable of being connected to a tank truck, which are vertically connected in sequence. A sampling unit is fixedly connected between the first conveying unit and the second conveying unit by bolts. The connected sampling unit includes a sampling cylinder and a material guiding cylinder 30 vertically connected to the first conveying unit and the second conveying unit; the first conveying unit includes a first hopper 10 and a first switch valve (not shown) for controlling the connection or closing of the lower end of the first hopper 10 and the material guiding cylinder 30. The first switch valve is fixedly installed between the upper end of the first hopper 10 and the upper end of the material guiding cylinder 30 by bolts, and the upper end of the first hopper 10 is connected to the mixing plant (not shown); the second conveying unit includes a second hopper 20 and a connecting hopper 301 located between the upper end of the second hopper 20 and the lower end of the material guiding cylinder 30. The connecting hopper 301 is coaxially fixedly installed at the lower end of the material guiding cylinder 30 by bolts. The connecting hopper 301 is located inside the second hopper 20, and the cross-sectional diameter of the connecting hopper 301 decreases sequentially from top to bottom; a second switch valve (not shown) for controlling the opening or closing of the second hopper 20 is provided at the lower end of the second hopper 20.

[0033] As Figure 1As shown, a feed inlet 302 is provided on the side wall of the material guiding cylinder 30, and the side wall of the sampling cylinder is rotatably installed at the feed inlet 302 of the material guiding cylinder 30; a rotating unit for controlling the intermittent flipping of the sampling cylinder is provided between the sampling cylinder and the material guiding cylinder 30. The rotating unit includes a telescopic cylinder 404 with intermittent expansion and contraction and a handle 403. The two ends of the handle 403 respectively pass through the front side and the rear side of the material guiding cylinder 30, and the two ends of the handle 403 are respectively welded to the middle parts of the front side wall and the rear side wall of the sampling cylinder. A sampling port 401 communicating with the upper end of the material guiding cylinder 30 is provided at the upper end of the sampling cylinder; at the same time, the handle 403 is rotatably connected to the material guiding cylinder 30, the upper end of the telescopic cylinder 404 is rotatably connected to the handle 403, the lower end of the telescopic cylinder 404 is rotatably connected to the outer wall of the material guiding cylinder 30, and the rotation axes between the telescopic cylinder 404 and the material guiding cylinder 30, between the telescopic cylinder 404 and the handle 403, and between the material guiding cylinder 30 and the sampling cylinder are all parallel.

[0034] As Figure 1 and Figure 2 It further includes a material receiving and detecting unit. The material receiving and detecting unit includes a slide rail 60, a material receiving box 601, a return rail 50 located below the material receiving box 601, and a slider 607 for driving the material receiving box 601 to slide horizontally on the slide rail 60; the slide rail 60 is horizontally arranged on the right side of the material guiding cylinder 30 and opposite to the sampling cylinder. The axis of the slide rail 60 is parallel to the right side wall of the material guiding cylinder 30. A switch port 402 is obliquely arranged at the lower end of the sampling cylinder, and a third switch valve (not shown) is provided on the switch port 402.

[0035] As Figure 1 and Figure 2 As shown, the upper end of the material receiving box 601 is an open mouth that can be opposite to the switch port 402. A hydrophobic layer 602 is fixedly laid on the bottom surface of the material receiving box 601, and a ring-shaped scale line is shown on the hydrophobic layer 602. The ring-shaped scale line is coaxially arranged with the bottom surface of the material receiving box 601; the return rail 50 is fixed to the upper right side of the second hopper 20 by bolts. A return groove 501 communicating with the second hopper 20 is provided on the return rail 50. The bottom surface of the return groove 501 is inclined, and the lowest point of the bottom surface of the return groove 501 is close to the second hopper 20.

[0036] As Figure 2As shown in the figure, mounting grooves 604 are horizontally arranged on the opposite side walls of the material receiving box 601. The length of the mounting groove 604 is equal to 0.98 times the width of the front side wall of the material receiving box 601. Moving blocks 605 are horizontally and slidably mounted in the mounting grooves 604. A scraping blade 606 is connected between the two moving blocks 605. The scraping blade 606 abuts against the upper surface of the hydrophobic layer 602. The moving path of the moving block 605 is perpendicular to the side wall of the material guiding cylinder 30. At the same time, a chute is provided in the slide rail 60. A convex strip 608 is integrally formed at the bottom of the chute of the slide rail 60. The longitudinal section of the slider 607 is in an inverted "concave" shape, and the convex strip 608 is embedded in the slider 607. The outer wall of the lower end of the slider 607 and the outer wall of the upper end of the slide rail 60 are both in an arc shape. An outlet 603 communicating with the material receiving box 601 is provided on the left side of the material receiving box 601. The width of the outlet 603 is the same as the width of the left side of the material receiving box 601. The lower side surface of the outlet 603 is coplanar with the bottom surface of the material receiving box 601. A baffle 609 that can close the outlet 603 is hinged to the upper side of the outlet 603 of the material receiving box 601. The outlet 603 can be opposite to the reflux groove 501. A counterweight 610 is fixedly installed on the left side of the baffle 609.

[0037] In addition, it further includes a processor, a first controller for controlling the opening or closing of the first switching valve, a second controller for controlling the opening or closing of the second switching valve, a third controller for controlling the opening or closing of the third switching valve, and a control signal input terminal. The first switching valve, the second switching valve, and the third switching valve are all electromagnetic switching valves. The first switching valve, the second switching valve, the third switching valve, the first controller, the second controller, the third controller, and the control signal input terminal are all electrically connected to the processor.

[0038] When the sampling device of the mixing station in this embodiment is used, the tank truck is first driven to the second hopper 20, and the filling port of the tank truck is opposite to or connected to the second hopper 20, and then a control signal is input into the processor through the control signal input end. At this time, the first switch valve is first controlled by the processor and the first controller to make the first hopper 10, the material guide cylinder 30, the connecting hopper 301 and the second hopper 20 connected in sequence, and the concrete enters the second hopper 20 through the first hopper 10, the material guide cylinder 30 and the connecting hopper 301; in this process, part of the concrete enters the sampling cylinder through the sampling port 401 at the upper end of the sampling cylinder, and when the sampling cylinder is filled with concrete, the excess concrete is taken out. The concrete will overflow from the sampling tube and be further conveyed to the second hopper 20 by the guide tube 30 and the connecting hopper 301; when the sampling tube is full, the upper end of the telescopic cylinder 404 is controlled to shorten, and the telescopic cylinder 404 pulls the handle 403 downward, and the handle 403 drives the sampling tube to flip, so that the sampling tube moves to the outside of the feed port 302, and the sampling is completed; then, the third switch valve at the switch port 402 is controlled to open through the control signal input end, and the sampling tube is unloaded at this time, and the concrete enters the receiving box 601 through the sampling tube. At this time, the concrete falls onto the hydrophobic layer 602 of the receiving box 601, and the slump of the concrete on the hydrophobic layer 602 can be roughly observed through the scale line , part of the concrete can also be taken from the receiving box 601 for corresponding concrete testing. The concrete sample is convenient to take and can ensure that the sampling and testing of the concrete are completed before the concrete enters the tank truck. After the concrete testing is completed, the qualified concrete sample is put back into the receiving box 601, and at the same time, the second controller controls the first switch valve to open, so that the concrete enters the tank truck through the second hopper 20. At this time, the right side of the receiving box 601 is manually held to make the receiving box 601 flip over on the slide rail 60, and the baffle 609 at the outlet 603 on the left side of the receiving box 601 is kept in a vertical state under the action of the counterweight block 610. At this time, the baffle 6 09 The separation is achieved by rotating the upper side of the discharge port 603 relative to the receiving box 601. The discharge port 603 is opposite to the reflow groove 501. The concrete in the receiving box 601 quickly slides through the discharge port 603 into the reflow groove 501 of the reflow rail 50. The reflow groove 501 guides the concrete to the second hopper 20 to achieve the filling of the concrete sample. During this process, the scraper 606 is moved along the mounting groove 604. The scraper 606 drives the moving block 605 to move in the mounting groove 604, and the concrete remaining on the hydrophobic layer 602 of the scraper 606 is transferred to the reflow groove 501, so that the concrete is fully recovered and the residual amount of concrete in the receiving box 601 is reduced.

[0039] During the above process, when it is necessary to intermittently sample the concrete in the material guiding cylinder 30, move the receiving box 601 on the sliding rail 60 so that different receiving boxes 601 face the sampling cylinder. This can achieve multiple samplings and multiple detections of the concrete, improve the detection accuracy of the concrete, and also determine the uniformity of the concrete, thereby improving the processing accuracy of the concrete.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. Sampling device for mixing plant, comprising a first conveying unit connected vertically in sequence and communicating with the mixing plant and a second conveying unit capable of communicating with a tank truck, characterized in that, It further includes a connecting sampling unit connected between the first conveying unit and the second conveying unit. The connecting sampling unit includes a sampling cylinder and a feeding cylinder vertically connected to the first conveying unit and the second conveying unit. A feeding port is provided on the side wall of the feeding cylinder. The side wall of the sampling cylinder is rotatably installed at the feeding port of the feeding cylinder. A sampling port communicating with the upper end of the feeding cylinder is provided at the upper end of the sampling cylinder. A rotating unit for controlling the intermittent flipping of the sampling cylinder is provided between the sampling cylinder and the feeding cylinder; The rotating unit includes a telescopic cylinder with intermittent expansion and contraction and a handle. The handle passes through the feeding cylinder and is fixedly connected to the side wall of the sampling cylinder. The handle is rotatably connected to the feeding cylinder. One end of the telescopic cylinder is rotatably connected to the handle, and the other end of the telescopic cylinder is rotatably connected to the outer wall of the feeding cylinder. The rotation axes between the telescopic cylinder and the feeding cylinder, between the telescopic cylinder and the handle, and between the feeding cylinder and the sampling cylinder are all parallel; It further includes a material receiving detection unit. The material receiving detection unit includes a slide rail, a material receiving box, a return rail located below the material receiving box, and a slider for driving the material receiving box to slide horizontally on the slide rail; The slide rail is horizontally arranged on the right side of the feeding cylinder and opposite to the sampling cylinder. The axis of the slide rail is parallel to the right side wall of the feeding cylinder. A switch port is inclinedly arranged at the lower end of the sampling cylinder; The first conveying unit includes a first hopper and a first switch valve for controlling the connection or closing of the lower end of the first hopper and the feeding cylinder. The first switch valve is fixedly installed between the upper end of the first hopper and the feeding cylinder. The upper end of the first hopper is connected to the mixing station; The second conveying unit includes a second hopper and a connecting hopper located between the upper end of the second hopper and the lower end of the feeding cylinder. The connecting hopper is coaxially and fixedly installed at the lower end of the feeding cylinder. The connecting hopper is located inside the second hopper. The cross-sectional diameter of the connecting hopper decreases sequentially from top to bottom; A second switch valve for controlling the opening or closing of the second hopper is provided at the lower end of the second hopper; The upper end of the material receiving box is an open mouth that can be opposite to the switch port. A hydrophobic layer is fixedly laid on the bottom surface of the material receiving box. A ring-shaped scale line is displayed on the hydrophobic layer. The ring-shaped scale line is coaxially arranged with the bottom surface of the material receiving box; The return rail is fixed to the upper right side of the second hopper by bolts. A return groove communicating with the second hopper is provided on the return rail. The bottom surface of the return groove is inclined, and the lowest point of the bottom surface of the return groove is close to the second hopper; Installation grooves are horizontally arranged on the opposite side walls of the material receiving box. The length of the installation groove is equal to 0.98 times the width of the front side wall of the material receiving box. Moving blocks are horizontally and slidably installed in the installation grooves. A scraping blade is connected between the two moving blocks. The scraping blade abuts against the upper surface of the hydrophobic layer. The moving path of the moving block is perpendicular to the side wall of the feeding cylinder; A chute is provided in the slide rail. A convex strip is integrally formed at the bottom of the chute of the slide rail. The longitudinal section of the slider is in an inverted "concave" shape. The convex strip is embedded in the slider; The outer walls of the lower end of the slider and the upper end of the slide rail are both in an arc shape; On the left side of the material receiving box, there is a discharge port communicating with the material receiving box. The width of the discharge port is the same as the width of the left side of the material receiving box. The lower side surface of the discharge port is coplanar with the bottom surface of the material receiving box. At the upper side of the discharge port of the material receiving box, there is a baffle hinged through a hinge to close the discharge port. The discharge port can be opposite to the reflux groove, and a counterweight is fixedly installed on the left side of the baffle.

2. The sampling device of the mixing plant according to claim 1, characterized in that, The hydrophobic layer is provided with a ring-shaped scale line, and the ring-shaped scale line is coaxially arranged with the bottom surface of the material receiving box.

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