Design method for buffering structure of material conveying chute

Abstract

The invention discloses a method for designing a buffering structure of a material conveying chute. The method comprises the steps that firstly, the boundary dimension and the internal structure of the chute are designed through the BIM technology according to actual working conditions; a discrete element simulation method is used for simulating the conveying process of the materials in the chute, the boundary dimension and construction measures of the chute are adjusted, and it is guaranteed that the materials can be normally conveyed, and impact energy borne by material receiving equipment at the tail end of the chute is smaller than a specified value; finally, according to load parameters output by discrete element analogue simulation, a finite element tool is used for guiding material selection and section design of chute parts. According to the invention, the dismounting and changing times of the chute in site construction and equipment debugging operation are reduced, the ineffective construction cost is reduced, the abrasion of materials to the chute wall plate and the flowing speed of the materials at the discharge port at the tail end of the chute are greatly reduced by utilizing the detachable buffer structure, the service lives of the chute wall plate and material receiving equipment at the rear end of the chute are prolonged, and the service life of the chute is prolonged. The defects of high cost, low efficiency, poor quality and poor reinforcing splicing impression in the traditional chute mounting and debugging process are overcome.

Description

Technical Field

[0001] The invention relates to the technical field of material transmission chute design, and in particular to a material transmission chute buffer structure design method. Background Art

[0002] A chute is a trough usually on the ground that transports materials from high places to low places. The inner surface is smooth and materials can slide down automatically. It is mainly used in construction sites such as buildings and mines. Chutes play an irreplaceable role in transportation operations.

[0003] At present, during the design process of material transfer chutes, the movement path of materials in the chute is rarely simulated, the load distribution of each component of the chute and the material flow rate at the rear end of the chute are not solved in detail, the thickness of the chute wall is not economical, the material utilization rate of non-wear parts is low, and there are no reinforcement measures for wear-prone parts; the impact energy received by the material receiving equipment at the rear end of the chute exceeds the limit, and the components cannot reach the normal service life limit. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a material transfer chute buffer structure design method, which uses BIM technology for preliminary design, and then simulates the transmission process to determine the final chute structure and size, thereby reducing the number of dismantling and modification during on-site construction and equipment commissioning and operation, and reducing invalid construction costs.

[0005] To achieve this technical purpose, the present invention adopts the following scheme: A material transfer chute buffer structure design method comprises the following steps: Step 1: Preliminary design of chute: According to the structural drawings and equipment drawings, use BIM software to establish the equipment, non-standard components and supporting floor models required for simulation from the front end to the rear end of each chute, determine the front and rear end positions and cross-sectional sizes of the chute, and draw the four-sided shell model of the chute; Step 2: Material movement simulation: Use discrete element tools to simulate the material transfer process in the chute; Step 3: Structural measures adjustment: When the impact energy on the material receiving equipment at the rear end of the chute is greater than the limit value, a buffer device is installed at the end point of the material curtain flow line and the chute side wall. The buffer device is adjusted with the dual control indicators of no material blockage in the chute and no impact energy on the rear end equipment greater than the limit value. Step 4: Deepening design of chute: According to the load distribution of each component of the chute output by the discrete element tool, appropriate materials and cross-sectional dimensions are selected, and the strength and stiffness of the design results are verified using the finite element tool. Reinforcement measures are set and further verified until the requirements of the design brief are met.

[0006] Compared with the prior art, the present invention has the following beneficial effects: The present invention reduces the number of times the chute is dismantled and modified during on-site construction and equipment commissioning and operation, reduces ineffective construction costs, reduces the cross-sectional size of the chute at the location not impacted by materials, and utilizes a detachable buffer structure to greatly reduce the wear of materials on the chute wall panels and the flow rate of materials at the discharge port at the end of the chute, thereby extending the service life of the chute wall panels and the material receiving equipment at the rear end of the chute, overcoming the shortcomings of high cost, low efficiency, poor quality, and poor reinforcement and splicing appearance in the traditional chute installation and commissioning process.

[0007] Furthermore, in the second step, a material storage box is added to the material receiving port at the front end of the chute, the material curtain flow line is adjusted, and the cross-sectional size of the chute at the blocked part is increased when blockage occurs.

[0008] Furthermore, the chute is composed of multiple wall panels, and adjacent wall panels are connected by flanges.

[0009] Furthermore, a buffer device is installed in the chute, and the buffer device includes a core shaft, and a paddle is arranged on the core shaft, and the paddle is connected to the wall plate.

[0010] Furthermore, the number of blade lobes and the horizontal projection area are adjusted according to the simulation results.

[0011] Furthermore, a buffer device is installed in the chute, and the buffer device includes a funnel and a bamboo hat, the funnel and the bamboo hat are arranged in odd and even arrangements, and the funnel and the bamboo hat are connected to the wall panel through a rib plate.

[0012] Furthermore, the upper part of the funnel is sealed and connected to the wall plate, and a gap is left between the lower part of the bucket and the wall plate; the material flows out from the center of the funnel, is diverted by the bucket to the gap between the bucket and the wall plate, and then enters the material receiving surface at the rear end of the lower funnel or chute. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the chute structure of an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of a buffer device according to an embodiment of the present invention; Figure 3 This is a schematic diagram of another structure of a buffer device according to an embodiment of the present invention; The markings in the figure are: 1. flange; 2. wall panel; 3. core shaft; 4. blade; 5. funnel; 6. hat; 7. rib plate. DETAILED DESCRIPTION

[0014] In order to fully understand the purpose, features and effects of the present invention, the present invention is described in detail through the following specific implementation methods, but the present invention is not limited thereto.

[0015] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly flanged on the other component or indirectly on the other component. When an element is referred to as being "connected to" or "laid on" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0016] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0017] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0018] The present invention provides a material transmission chute buffer structure design method, which is characterized by comprising the following steps: Step 1: Preliminary design of chute: According to the structural drawings and equipment drawings, use BIM software to establish the equipment, non-standard components and supporting floor models required for simulation from the front end to the rear end of each chute, determine the front and rear end positions and cross-sectional sizes of the chute, and draw the four-sided shell model of the chute; Step 2: Material movement simulation: Use discrete element tools to simulate the material transfer process in the chute, add a material storage box at the front end of the chute, adjust the material curtain flow line, and increase the cross-sectional size of the chute at the blocked part when material blockage occurs; Step 3: Structural measures adjustment: When the impact energy on the material receiving equipment at the rear end of the chute is greater than the limit value, a buffer device is installed at the end point of the material curtain flow line and the chute side wall. The buffer device is adjusted with the dual control indicators of no material blockage in the chute and no impact energy on the rear end equipment greater than the limit value. Continue to use the discrete element tool to simulate the movement process of materials in the chute after adding the buffer device. If there is material blockage at the first buffer structure at the front end, reduce the ratio of the receiving surface of the buffer structure to the cross-sectional area of ​​the chute corresponding to its position until no blockage occurs during the simulation running time; then adjust the form of the remaining buffer structure devices, the distance from the previous buffer device, the receiving area and other parameters until there is no blockage in the chute and the impact load on the rear end receiving device meets the requirements; if the receiving conveying device or storage structure at the end of the chute has abnormal conditions such as overloading or leakage, appropriately adjust the material accumulation box at the receiving port at the rear end of the chute to correct the flow direction of the material curtain.

[0019] Step 4: Deepening design of chute: According to the load distribution of each component of the chute output by the discrete element tool, appropriate materials and cross-sectional dimensions are selected, and the strength and stiffness of the design results are verified using the finite element tool. Reinforcement measures are set and further verified until the requirements of the design brief are met.

[0020] The purpose of arranging a buffer device in the present invention is to avoid the material from impacting the chute wall plate as much as possible; the principle of the buffer device is to increase the number of collisions of the material in the chute, thereby reducing the kinetic energy of the material by increasing the number of collisions; as the number of collisions of the material increases, the length of the movement path inside the chute increases, and the kinetic energy of the material can be further reduced by frictional resistance, and finally the impact load on the receiving surface at the rear end of the chute is not greater than the limit value, thereby extending the service life of the receiving equipment or structure.

[0021] See also Figure 1 The chute is composed of multiple wall panels 2, and adjacent wall panels 2 are connected by flanges 1.

[0022] In some embodiments, see Figure 2 The buffer device is installed in a detachable chute, and the buffer device includes a core shaft 3, on which a paddle 4 is arranged, and the paddle 4 is connected to the wall plate 2. The number of the four lobes of the paddle and the horizontal projection area are adjusted according to the simulation results. The flange hole is an integer multiple of the number of the four lobes of a single buffer device, and the paddle-shaped buffer device is rotated step by step according to the number of devices actually installed.

[0023] In some embodiments, see Figure 3 The buffer device is installed in a detachable chute, and the buffer device includes a funnel 5 and a bamboo hat 6. The funnel 5 and the bamboo hat 6 are arranged in an odd-even pattern, and the funnel 5 and the bamboo hat 6 are connected to the wall panel 2 through a rib plate 7.

[0024] Specifically, the rib plate 7 is arranged on the outside of the funnel 5 and connected to the wall plate 2 , and the rib plate 7 is arranged below the bamboo hat 6 and connected to the wall plate 2 .

[0025] More specifically, the upper part of the funnel 5 is sealed and connected to the wall panel 2, and a gap is left between the lower part of the conical hat 6 and the wall panel 2; the material flows out from the center of the funnel 5, is diverted by the conical hat 6 to the gap between the conical hat 6 and the wall panel 2, and then enters the lower funnel 5 or the rear end receiving surface of the chute. At least one pair of conical hat-shaped buffer devices are configured, and the funnel 5 is configured at the rear end receiving surface of the chute.

[0026] The difference between the conical-hat-shaped buffer device and the paddle-shaped buffer device is that the projection of the material's movement path in the conical-hat-shaped buffer device's chute on the plane perpendicular to the line connecting the starting point and the end point is alternating radial divergence and radial convergence, while the projection of the material's movement path in the paddle-shaped buffer device on the plane perpendicular to the line connecting the starting point and the end point is approximately circular or spiral motion; the conical-hat-shaped buffer device does not need to set a material accumulation box at the rear end of the chute to adjust the direction of the material streamline.

[0027] Compared with the prior art, the present invention has the following beneficial effects: The present invention reduces the number of times the chute is dismantled and modified during on-site construction and equipment commissioning and operation, reduces ineffective construction costs, reduces the cross-sectional size of the chute at the location not impacted by materials, and utilizes a detachable buffer structure to greatly reduce the wear of the material on the chute wall panel 2 and the flow rate of the material at the end of the chute. The service life of the chute wall panel 2 and the material receiving equipment at the rear end of the chute is extended, and the shortcomings of high cost, low efficiency, poor quality, and poor reinforcement and splicing appearance in the traditional chute installation and commissioning process are overcome.

[0028] Finally, it should be noted that the above are only preferred embodiments of the present invention. Of course, those skilled in the art can make changes and modifications to the present invention. If these modifications and variations fall within the scope of the claims of the present invention and their equivalent technologies, they should be considered to be within the scope of protection of the present invention.

Claims

1. A material transfer chute buffer structure design method, characterized in that: The following steps are included: Step 1: Preliminary design of chute: According to the structural drawings and equipment drawings, use BIM software to establish the equipment, non-standard components and supporting floor models required for simulation from the front end to the rear end of each chute, determine the front and rear end positions and cross-sectional sizes of the chute, and draw the four-sided shell model of the chute; Step 2: Material movement simulation: Use discrete element tools to simulate the material transfer process in the chute; Step 3: Structural measures adjustment: When the impact energy on the material receiving equipment at the rear end of the chute is greater than the limit value, a buffer device is installed at the end point of the material curtain flow line and the chute side wall. The buffer device is adjusted with the dual control indicators of no material blockage in the chute and no impact energy on the rear end equipment greater than the limit value. Step 4: Deepening design of chute: According to the load distribution of each component of the chute output by the discrete element tool, appropriate materials and cross-sectional dimensions are selected, and the strength and stiffness of the design results are verified using the finite element tool. Reinforcement measures are set and further verified until the requirements of the design brief are met.

2. The material transfer chute buffer structure design method according to claim 1, characterized in that: In the second step, a material storage box is added to the material receiving port at the front end of the chute, the material curtain flow line is adjusted, and the cross-sectional size of the chute at the blocked part is increased when blockage occurs.

3. The material transfer chute buffer structure design method according to claim 1, characterized in that: The chute is composed of multiple wall sections, and adjacent wall sections are connected by flanges.

4. The material transfer chute buffer structure design method according to claim 1, characterized in that: The buffer device is installed in the chute, and the buffer device comprises a core shaft, on which a paddle is arranged, and the paddle is connected to the wall plate.

5. The material transfer chute buffer structure design method according to claim 4, characterized in that: The number of blade petals and the horizontal projection area are adjusted according to the simulation results.

6. The material transfer chute buffer structure design method according to claim 1, characterized in that: The buffer device is installed in the chute, and the buffer device comprises a funnel and a bamboo hat, the funnel and the bamboo hat are arranged in odd and even pairs, and the funnel and the bamboo hat are connected with the wall plate through a rib plate.

7. The material transfer chute buffer structure design method according to claim 6, characterized in that: The upper part of the funnel is sealed and connected to the wall plate, and a gap is left between the lower part of the bucket and the wall plate; the material flows out from the center of the funnel, is diverted by the bucket to the gap between the bucket and the wall plate, and then enters the material receiving surface at the rear end of the lower funnel or chute.

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