Intermittent conveying system

Abstract

The invention relates to the technical field of sediment conveying, in particular to an intermittent conveying system which comprises a conveying mechanism, a sediment receiving mechanism and a control circuit, the conveying mechanism is composed of a conveying belt, conveying wheels, a motor, a belt wheel and a belt, and the sediment receiving mechanism comprises a plurality of sediment receiving frames arranged on the conveying belt in a matrix mode. The control circuit comprises a power supply and a wheel disc conductive mechanism. The wheel disc conductive mechanism is composed of a mounting plate, a conductive rod, a driving motor and a plurality of conductive sheets. In addition, the adjacent sand receiving frames are communicated through pipelines, filter screens are arranged in the sand receiving frames, the control circuit may be provided with slide rheostats, the conveying wheels may be gears, the conveying belt may be an inner toothed belt, and the system may further comprise a conveying table. The technical effects that intermittent conveying of materials is achieved, sand is filtered, and the conveying speed is convenient to adjust are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of sediment transportation, and in particular to an intermittent transportation system. Background Art

[0002] Flume tests are an important means of studying the laws of river sediment movement, and the bed load transport rate is the core parameter that characterizes the intensity of bed load movement and reveals the mechanism of riverbed evolution.

[0003] At present, in experiments related to bed load movement, the main measurement is still the bed load transport rate of the entire section, and it is generally carried out by using a sand receiving basket connected to a hanging scale to continuously collect sand at the end of the water trough and weigh it regularly.

[0004] Traditional test methods have many limitations: First, the method of using a sand collecting basket connected to a hanging scale to continuously collect sand at the end of the flume requires frequent manual operation and data recording, resulting in low measurement efficiency and easy introduction of human errors; second, the existing device cannot realize automated intermittent measurement, and it is difficult to accurately capture the dynamic changes in sediment transport; third, the fixed sand collecting device can only measure the bed load sediment transport rate of the entire section, and cannot reflect the lateral distribution characteristics of the sediment transport rate, which creates an obstacle to in-depth research on the local laws of sediment movement. In addition, the traditional sand collecting device lacks effective filtering and diversion structures. Sediment is easily lost or unevenly distributed during the measurement process, further affecting the measurement accuracy. These technical defects seriously restrict the accuracy and scientific nature of river sediment movement research. Summary of the Invention

[0005] In view of the defects existing in the prior art, the purpose of the present invention is to provide an intermittent transmission system, which has the advantages of improving measurement efficiency, reducing human errors, realizing automated intermittent measurement and capturing the dynamic changes in sediment transport process.

[0006] In order to achieve the above purpose, the technical solution adopted by the present invention is:

[0007] An intermittent conveying system includes a conveying mechanism, a sand receiving mechanism and a control circuit, wherein

[0008] The transmission mechanism includes a conveyor belt, two transmission wheels, a motor, two pulleys and a belt; the two transmission wheels are arranged side by side with their axes parallel to each other, and the conveyor belt is wound around the two transmission wheels;

[0009] The motor is fixed, one pulley is mounted on the motor's shaft, the other pulley is coaxially mounted on the end of a transmission wheel, and the belt is wound around the two pulleys;

[0010] The sand receiving mechanism includes a plurality of sand receiving frames, which are arranged in a matrix on the conveyor belt;

[0011] The control circuit includes a power supply and a wheel conductive mechanism. The wheel conductive mechanism includes a mounting plate, a conductive rod, a drive motor and multiple conductive sheets. The mounting plate and the drive motor are fixedly arranged, the drive motor is electrically connected to the power supply, one end of the conductive rod is insulated and connected to the rotating shaft of the drive motor, and multiple conductive sheets are installed on the mounting plate in a ring-shaped manner around the rotating shaft of the motor at equal intervals; the conductive rod can slide on the plate surface of the mounting plate, and the other end of the conductive rod can be operatively contacted with the multiple conductive sheets; each conductive sheet is electrically connected to an electrode of the power supply, and one end of the conductive rod is connected in series with the motor and then electrically connected to the other electrode of the power supply.

[0012] Optionally, every two adjacent sand receiving frames are connected through a pipe.

[0013] Optionally, a filter is provided inside each sand receiving frame.

[0014] Optionally, the filter is located above the connecting port between the sand receiving frame and the pipeline.

[0015] Optionally, the control circuit further includes a sliding rheostat, which is connected in series between the motor and the other electrode of the power supply.

[0016] Optionally, the conveying wheel is a gear, the conveying belt is an internally toothed belt, and the inner surface of the conveying belt is meshed with the gear.

[0017] Optionally, the intermittent conveying system further includes a conveying platform, which includes a support frame and a roller group, wherein the roller group is mounted on the upper end of the support frame, and the upper end of the roller group is flush with the upper end of the conveyor belt.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The intermittent operation of the conveyor belt is controlled by the conductive mechanism of the wheel, and the matrix-type sand receiving frame is used to realize automatic intermittent measurement. This solves the problems of low efficiency, large errors and inability to dynamically capture sediment transport in traditional methods, and has the advantages of improving measurement accuracy and scientificity.

[0020] 2. Multiple sand receiving frames are arranged in a matrix on the conveyor belt, which can reflect the lateral distribution characteristics of the sediment transport rate and facilitate in-depth research on the local laws of sediment movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0022] Figure 1 It is a structural schematic diagram of the intermittent conveying system of the present invention;

[0023] Figure 2 Schematic diagram of the structure of the control circuit of the present invention;

[0024] Figure 3 It is a top view of the sand receiving mechanism of the present invention.

[0025] In the figure: 1. Conveyor belt; 2. Conveyor wheel; 3. Motor; 4. Pulley; 5. Belt; 6. Sand connecting frame; 7. Power supply; 8. Mounting plate; 9. Conductive rod; 10. Conductive sheet; 11. Pipeline; 12. Filter; 13. Sliding rheostat; 14. Support frame; 15. Roller assembly. DETAILED DESCRIPTION

[0026] The technical solutions in this application will be clearly and completely described below in conjunction with the drawings in this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all of the embodiments. The components of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application for which protection is claimed, but merely represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of this application.

[0027] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and should not be understood as indicating or implying relative importance.

[0028] In existing flume tests, bedload transport rate measurements rely primarily on manually operated continuous sand collection baskets. This method requires frequent weighing with a hanging scale, resulting in high labor consumption and low measurement efficiency. Because the baskets only collect bedload across the entire cross-section, they are unable to distinguish sediment transport characteristics across different regions. Consequently, the test data fail to reflect lateral distribution patterns, hindering in-depth research into riverbed evolution mechanisms.

[0029] To address these issues, researchers discovered that the traditional continuous sand collection method struggles to achieve regional measurement, while manual intervention can easily introduce weighing errors. Analysis revealed the need for a device that automatically controls the sand collection position and achieves intermittent motion. Based on this, they proposed a method that combines mechanical transmission with circuit control, incorporating periodic sand collection containers within the conveyor system. This, combined with a timed start-stop drive mechanism, allows for regional sand collection and automated measurement.

[0030] Combine Figures 1 to 3 As shown, an embodiment of the present invention discloses an intermittent conveying system comprising a conveying mechanism, a sand receiving mechanism, and a control circuit. The conveying mechanism is used to drive the sand receiving mechanism, and the control circuit is used to control the conveying mechanism's intermittent operation. This achieves automated intermittent measurement, accurately capturing the dynamic changes in sediment transport and improving measurement efficiency and accuracy. The conveying mechanism can drive the sand receiving mechanism to move cyclically, allowing the sand receiving mechanism to sequentially receive sediment. The control circuit enables the conveying mechanism's intermittent operation to simulate the dynamic process of sediment transport.

[0031] Specifically, the transmission mechanism includes a conveyor belt 1, two transmission wheels 2, a motor 3, two pulleys 4 and a belt 5. The two transmission wheels 2 are arranged side by side with parallel axes. This arrangement allows the conveyor belt 1 to be smoothly wound on them. The conveyor belt 1 is usually made of rubber, which has a certain degree of flexibility and wear resistance. Of course, it can also be replaced by a high-strength plastic material. The motor 3 is fixed, one pulley 4 is installed on the rotating shaft of the motor 3, and the other pulley 4 is coaxially installed at the end of one transmission wheel 2. The belt 5 is wrapped around the two pulleys 4. In this way, when the motor 3 rotates, the transmission wheel 2 is driven to rotate through the belt 5, thereby moving the conveyor belt 1. The motor 3 can be an AC motor 3 or a DC motor 3, and the appropriate power can be selected according to actual needs. The pulley 4 is usually made of cast iron, and an aluminum alloy can also be used to reduce weight.

[0032] It's worth noting that in this embodiment, the parallel axes of the transmission wheels 2 refer to maintaining horizontal alignment between the two cylindrical wheels. The transmission wheels 2 can be made of metal or engineering plastic to ensure stable operation of the conveyor belt 1. The conveyor belt 1 is wound around the two transmission wheels 2 to form a closed loop, and the surface may be provided with anti-slip grooves. The coaxial installation of the pulleys 4 means that one pulley 4 shares a common rotation axis with the transmission wheel 2, enabling power transmission via a keyway or flange structure.

[0033] The sand receiving mechanism of this embodiment consists of sand receiving frames 6 arranged in a matrix on the conveyor belt 1. The matrix arrangement of the sand receiving frames 6 refers to the arrangement of multiple containers in rows and columns. They can be welded or bolted to the surface of the conveyor belt 1. The sand receiving frames 6 are generally made of stainless steel, which is corrosion-resistant and durable. They can also be made of engineering plastic to reduce weight. The sand receiving frames 6 are square in shape, and their size is determined according to actual needs. A certain distance is maintained between adjacent sand receiving frames 6 to facilitate installation and maintenance. The volume of each frame can be set to 1-5 liters.

[0034] The control circuit includes a power supply 7 and a wheel conductive mechanism. The wheel conductive mechanism includes a mounting plate 8, a conductive rod 9, a drive motor and a plurality of conductive sheets 10. The mounting plate 8 and the drive motor are fixedly arranged. One end of the conductive rod 9 is insulated and connected to the rotating shaft of the drive motor. The plurality of conductive sheets 10 are installed on the mounting plate 8 in a ring-shaped and evenly spaced manner around the rotating shaft of the motor; the conductive rod 9 can slide on the plate surface of the mounting plate 8, and the other end of the conductive rod 9 can be operatively contacted with the plurality of conductive sheets 10; each conductive sheet 10 is electrically connected to an electrode of the power supply 7, and one end of the conductive rod 9 is electrically connected to the other electrode of the power supply 7 after being connected in series with the motor 3.

[0035] The mounting plate 8 is typically made of an insulating material, such as an epoxy resin plate, to prevent electrical leakage. The conductive rod 9 is typically made of metal, with a surface coating of a material having good electrical conductivity, such as silver or copper. The conductive sheet 10 is also made of metal to ensure good electrical conductivity. The drive motor can be a stepper motor, which can precisely control the rotation angle of the conductive rod 9. The circular, evenly spaced distribution of the conductive sheets 10 in the wheel's conductive mechanism means that the metal conductors are evenly arranged along the circumference, and the spacing angle can be set to 30-60 degrees. When the conductive rod 9 slides in contact, an intermittent circuit is formed.

[0036] Specifically, when the conductive rod 9 contacts a conductive sheet 10, the circuit is connected, activating the motor 3. This, in turn, drives the conveyor wheel 2 via the belt 5, driving the conveyor belt 1 in a step-by-step motion, which in turn moves the sand receiving frame 6 to a designated area. When the conductive rod 9 detaches from the conductive sheet 10, the circuit is disconnected, the conveyor belt 1 stops, and the sand receiving frame 6 stops to collect the bedload in that area. After a preset time, the conductive rod 9 contacts the next conductive sheet 10, and the system restarts and enters the next operating cycle.

[0037] Compared to existing methods, which require manual handling of sand collection baskets and recording of data for each area, this solution utilizes automated mechanical processing to achieve zone-by-zone sand collection, eliminating human error. While the existing method of continuous sand collection results in sample mixing from different areas, this solution uses intermittent motion to ensure that each sand collection frame 6 independently collects bedload from a specific area. While traditional crane scales require interrupting the test process for weighing, this solution allows for online weighing measurements while the conveyor belt 1 is stationary.

[0038] Through the above-mentioned technical solution, this application achieves automated, regionalized measurement of bedload sediment transport rates, accurately capturing sediment transport characteristics at different locations. The system programmatically controls the dwell time of the sand receiving frame 6, ensuring consistent sample collection duration in each area. The wheel-type conductive mechanism provides reliable on / off control, achieving millimeter-level displacement accuracy for the conveyor belt 1. The matrix-arranged sand receiving frames 6 enable simultaneous collection of multiple cross-sectional samples, significantly improving test efficiency and data integrity.

[0039] The present application further proposes that every two adjacent sand receiving frames 6 are connected by a pipe 11. The pipe 11 refers to a flow guide component connecting adjacent sand receiving frames 6, and can be implemented by a flexible rubber tube or a hard PVC tube. The pipe diameter can be set to, for example, 10-20 mm to match the sand discharge rate of the sand receiving frames 6.

[0040] The present application further proposes that a filter screen 12 is provided inside each sand receiving frame 6. The filter screen 12 refers to a mesh structure for filtering solid particles, which can be specifically realized by stainless steel mesh or nylon mesh material, and the mesh size can be adjusted according to the test requirements. The filter screen 12 is arranged horizontally inside the sand receiving frame 6, and is used to intercept bedload sediment during the sand receiving process and allow water to pass through, thereby avoiding water mixing into the weighing process and causing measurement errors. A filter screen 12 is provided above the connection between the sand receiving frame 6 and the pipeline 11, which can achieve solid-liquid separation when the water flow carries sediment into the sand receiving frame 6, so that the sediment is deposited above the filter screen 12 and the water flows through the filter screen 12 and is discharged.

[0041] Specifically, when water carrying bedload sediment enters the sand receiving frame 6, the filter screen 12 traps the sediment within the frame, while the water flows through the holes in the filter screen 12 and is discharged to an adjacent sand receiving frame 6 or an external collection device. The sediment continues to accumulate above the filter screen 12 until the sand receiving frame 6 moves to the weighing position, at which point only the dry sediment needs to be weighed to obtain accurate sediment transport rate data. The relative positioning of the filter screen 12 and the connection port of the pipeline 11 separates the water discharge path from the sediment deposition area, preventing secondary loss of deposited sediment due to water scouring.

[0042] Compared to existing technologies, traditional sand collection baskets directly collect water-sand mixtures, requiring manual airing or drying before weighing. This is not only time-consuming but also prone to data deviation due to residual moisture. This solution uses a filter 12 to achieve real-time solid-liquid separation during the sand collection process, eliminating the impact of moisture on measurement results. This solution also reduces manual intervention and allows weighing operations to be performed simultaneously with the sand collection process.

[0043] Through the above-mentioned technical solution, this application solves the problem of weighing errors caused by moisture interference in traditional bedload transport rate measurements, improving the accuracy and continuity of data collection. The filter 12 structure enables the sand receiving frame 6 to process a larger flow rate of sediment samples per unit time, providing high-precision basic data support for analyzing the lateral distribution characteristics of bedload transport rate.

[0044] The present application further proposes that the filter screen 12 is located above the connecting port between the sand receiving frame 6 and the pipeline 11. Specifically, when the sand receiving frame 6 moves with the conveyor belt 1 to the connecting area of the pipeline 11, after the silt carried by the water flow enters the sand receiving frame 6, the larger particles are trapped inside the frame by the filter screen 12, and the filtered water flows into the adjacent sand receiving frame 6 through the connecting port. Since the filter screen 12 is arranged directly above the connecting port, the silt deposition process can avoid clogging the entrance of the pipeline 11, and at the same time, the water level balance in each sand receiving frame 6 can be maintained. For example, when the sand receiving frame 6 carries mixed silt containing gravel, the gravel is blocked by the filter screen 12 and accumulated in the frame, while the fine sand passes through the filter screen 12 with the water flow and enters the pipeline 11, thereby realizing the automatic separation and continuous transmission of silt of different particle sizes.

[0045] Compared to existing technologies, traditional sand receiving devices lack a layered filtration structure, allowing sediment to enter pipe 11 directly, easily causing blockage and failing to distinguish particle gradations. This solution, by positioning the filter screen 12 in a spatial relationship with the connection port, maintains hydraulic connectivity between the sand receiving frame 6 and achieves real-time interception of coarse particles.

[0046] Through the above technical solution, the present application can effectively prevent the pipeline 11 from being blocked and simultaneously complete the sediment particle size classification, while maintaining the continuous operation of the sand receiving frame 6 and improving the refinement of the test data, thereby solving the measurement distortion problem caused by mixed collection of traditional sand receiving devices.

[0047] The present application further proposes that the control circuit further includes a sliding rheostat 13, which is connected in series between the motor 3 and the other electrode of the power supply 7. The sliding rheostat 13 is used to change the current flowing through the motor 3 by adjusting the resistance value, thereby controlling the speed of the motor 3.

[0048] Specifically, when the conductive rod 9 contacts a conductive sheet 10, the circuit closes, energizing the motor 3. At this point, the resistance of the sliding rheostat 13 is pre-adjusted to the target range, for example, by adjusting the contact position manually or through an electric drive mechanism. This change in resistance directly affects the input voltage to the motor 3, thereby altering the speed of the conveyor belt 1. For example, to shorten the rest period of the conveyor belt 1, the resistance can be reduced to increase the current, speeding up the motor 3. Conversely, increasing the resistance can reduce the speed, extending the rest period.

[0049] Compared to existing technologies, motor 3 is directly connected to power source 7, resulting in a fixed and unadjustable speed. This results in a single pause time for conveyor belt 1 and large errors in the position of sand receiving frame 6. However, this solution introduces a sliding rheostat 13, which dynamically adjusts the speed of conveyor belt 1 according to experimental requirements. This allows for more precise dwell time and position of sand receiving frame 6, thereby reducing measurement errors caused by speed mismatch.

[0050] Through the above technical solution, the present application can flexibly control the intermittent movement rhythm of the conveyor belt 1, so that the time that the sand receiving frame 6 stays at the predetermined position matches the experimental conditions, avoiding the deviation of the sand receiving amount caused by the fixed conveying speed, and at the same time reducing the frequency of manual intervention to adjust the equipment operating parameters, thereby improving the degree of measurement automation.

[0051] The present application further proposes that the transmission wheel 2 is a gear, the conveyor belt 1 is an internal toothed belt, and the inner surface of the conveyor belt 1 is meshed with the gear. The internal toothed belt refers to a flexible transmission belt with a toothed structure on the inner surface. Specifically, it can be made of a rubber base material and a reinforced fiber composite. The toothed structure and the gear teeth are meshed with each other to form a meshing connection relationship. Specifically, the gear is a component of the transmission wheel 2, and its teeth are meshed with the toothed structure on the inner side of the internal toothed belt. When the motor 3 drives the pulley 4 to rotate, the power is transmitted to the conveyor belt 1 through the meshing of the gear and the internal toothed belt, causing the conveyor belt 1 to intermittently move along a predetermined trajectory. Due to the existence of the meshing connection, there will be no slippage between the conveyor belt 1 and the gear, and the lateral position error of the sand receiving frame 6 on the conveyor belt 1 is effectively controlled, thereby ensuring the precise positioning of the sand receiving frame 6 during the stop stage.

[0052] Compared to existing technologies, traditional transmission systems typically use smooth pulleys and flat belts 5, which are prone to slippage due to inertia during start-up and stop phases, leading to positioning errors in the sand receiving frame 6. The meshing transmission of gears and internally toothed belts, however, constrains relative motion through tooth interlocking, eliminating slippage and significantly improving the position control accuracy of the conveyor belt 1.

[0053] Through the above technical solution, the present application solves the problem of distortion in the measurement of the lateral distribution characteristics of the sand transport rate caused by inaccurate lateral positioning of the sand receiving frame 6. The synchronization and repeatability of the intermittent motion of the conveyor belt 1 are ensured through rigid meshing transmission, providing basic conditions for the accurate analysis of the lateral differences in the bed load sand transport rate in the flume test.

[0054] The present application further proposes to include a conveyor platform, which includes a support frame 14 and a roller group 15. The support frame 14 refers to a frame structure that supports the roller group 15, which can be formed by welding metal profiles to provide a stable installation base. The roller group 15 refers to a transmission component composed of a plurality of rotatable cylinders, which can be implemented by an array of steel rollers with a rubber layer on the surface, and the axis spacing can be adjusted according to the width of the conveyor belt 1. The upper end of the roller group 15 is flush with the upper end of the conveyor belt 1, which means that the working surfaces of the two are at the same horizontal height. This can be achieved by adjusting the height of the support frame 14 or selecting rollers of appropriate diameter to ensure that the sand receiving frame 6 smoothly transitions between the conveyor belt 1 and the roller group 15.

[0055] Specifically, when the conveyor belt 1, carrying the sand receiving frame 6, reaches its end, the roller assembly 15 rotates to receive the sand receiving frame 6. Because the upper end of the roller assembly 15 remains flush with the conveyor belt 1, the sand receiving frame 6 does not experience vibration or tilting due to height differences during transfer. The support frame 14 provides stable support for the roller assembly 15, preventing structural deformation due to load fluctuations. During the test, the sand receiving frame 6 can continue to move along the roller assembly 15 to the designated collection area, achieving automated transfer.

[0056] In some embodiments, the roller assembly 15 can be constructed using two sets of parallel rollers forming a transmission track, with the spacing between the rollers set to be less than the length of the bottom edge of the sand receiving frame 6. A height adjustment bolt can be added to the bottom of the support frame 14 to fine-tune the alignment accuracy between the roller assembly 15 and the conveyor belt 1. Alternatively, the roller assembly 15 can have an annular groove formed on its surface to mate with a guide protrusion on the edge of the conveyor belt 1 to prevent the sand receiving frame 6 from shifting.

[0057] Compared to existing technologies, existing testing devices typically require manual handling of the sand receiving frame 6 or use fixed slides, which pose a risk of the sand receiving frame 6 tipping over and are unable to accommodate sand receiving frames of varying sizes. This solution utilizes an adjustable roller assembly 15 in conjunction with the conveyor belt 1 to achieve unpowered, autonomous transport of the sand receiving frame 6, while also avoiding measurement errors caused by manual intervention.

[0058] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of this application, it should be understood that if the terms "upper", "lower", "left", "right", etc. indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. This is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0059] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. An intermittent conveying system, characterized in that: It includes a transmission mechanism, a sand receiving mechanism and a control circuit, wherein The transmission mechanism includes a transmission belt, two transmission wheels, a motor, two pulleys and a belt; the two transmission wheels are arranged side by side with their axes parallel to each other, and the transmission belt is wound around the two transmission wheels; The motor is fixed, one pulley is mounted on the rotating shaft of the motor, the other pulley is coaxially mounted on the end of one of the transmission wheels, and the belt is wound around the two pulleys; The sand receiving mechanism includes a plurality of sand receiving frames, and the plurality of sand receiving frames are arranged in a matrix on the conveyor belt; The control circuit includes a power supply and a wheel conductive mechanism, and the wheel conductive mechanism includes a mounting plate, a conductive rod, a drive motor and a plurality of conductive sheets. The mounting plate and the drive motor are fixedly arranged, and the drive motor is electrically connected to the power supply. One end of the conductive rod is insulated and connected to the rotating shaft of the drive motor, and a plurality of conductive sheets are installed on the mounting plate in a ring-shaped manner and at equal intervals around the rotating shaft of the motor; the conductive rod can slide on the plate surface of the mounting plate, and the other end of the conductive rod can be operatively contacted with the plurality of conductive sheets; each of the conductive sheets is electrically connected to an electrode of the power supply, and one end of the conductive rod is connected in series with the motor and then electrically connected to the other electrode of the power supply.

2. The intermittent conveying system according to claim 1, wherein: Every two adjacent sand connection frames are connected through a pipeline.

3. The intermittent conveying system according to claim 2, wherein: A filter is provided inside each of the sand receiving frames.

4. The intermittent conveying system according to claim 3, wherein: The filter screen is located above the communication port between the sand receiving frame and the pipeline.

5. The intermittent conveying system according to any one of claims 1 to 4, characterized in that: The control circuit further includes a sliding resistor connected in series between the motor and the other electrode of the power supply.

6. The intermittent conveying system according to any one of claims 1 to 4, characterized in that: The transmission wheel is a gear, the transmission belt is an inner toothed belt, and the inner surface of the transmission belt is meshed and connected with the gear.

7. The intermittent conveying system according to any one of claims 1 to 4, characterized in that: It also includes a conveying platform, which includes a support frame and a roller group. The roller group is installed on the upper end of the support frame, and the upper end of the roller group is flush with the upper end of the conveyor belt.

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