An improved material conveying system

Abstract

The invention relates to an improved material conveying system, including a finished product bin, a metering bin and a sending bin connected in sequence from top to bottom, wherein the finished product bin is provided with a plurality of metering bins, and each metering bin is provided with a sending bin, the finished product bin is connected with the metering bin through a first conveying pipeline, and the metering bins are connected through a second conveying pipeline, and a bulk material dispenser is provided at the entrance of the first conveying pipeline near the metering bin; a fluidizing disk is provided at the lower part of the sending bin, and a fluidizing net sintered by multiple layers of stainless steel nets is provided in the fluidizing disk. The invention provides an improved material conveying system, which specifically improves the problems of inaccurate material conveying and metering in the metering bin and the problem of easy damage of the fluidizing net of the fluidizing disk of the sending bin, so as to facilitate the conveying of limestone powder.

Description

Technical Field

[0001] The invention relates to the technical field of material conveying, in particular to an improved material conveying system. Background Art

[0002] The limestone powder conveying system of the desulfurizer plant plays a vital role in the limestone powder production process. When the conveying capacity is greater than the production capacity, the desulfurizer plant can produce normally. When the conveying capacity is less than the production capacity, it will cause unplanned shutdown, which may seriously affect the normal supply of limestone powder to the power plant.

[0003] The material transportation of limestone powder in the desulfurizer plant includes two stages: unloading from the finished product warehouse to the metering warehouse and unloading from the metering warehouse to the sending warehouse. Among them, the material transportation of the metering warehouse has the following problems:

[0004] The finished product bin is located at a relatively high position, and the gravitational potential energy of the material inside is relatively large. When the finished product bin discharges materials to the metering bin, the material flows quickly. When the material enters the metering bin, the material is easily compacted, forming an arch or bridge. The friction between the material itself and the material and the metering bin is greatly increased, resulting in slow discharge from the metering bin to the sending bin, and residual material inside the metering bin. Due to the slow discharge of materials from the metering bin to the sending bin and the residual material, the time of the circulating material transportation process is increased, which affects the transportation volume of limestone powder from the metering bin to the sending bin.

[0005] In addition, there are usually several metering bins under the finished product bin, which are integrated and installed on a frame. In addition to the above-mentioned problem of slow material transportation, there are also the following problems in metering: (1) There is a linear error when the metering bin is working; (2) There is a repeatability error when the metering bin is working; (3) There is a zero return error when the metering bin is working; (4) The measurement accuracy is poor, resulting in unstable readings; (5) When an object approaches the metering bin, the measurement data will change accordingly, and the two metering bins will affect each other. If a metering bin has the same load, when the load of the metering bin next to it changes, the metering bin will also change.

[0006] The following problems exist in the material transportation of the sending warehouse: the reduction in the transportation capacity of the sending warehouse is mainly caused by the reduction of the fluidization efficiency in the sending device transportation project. The level of fluidization efficiency depends on the quality of the fluidization net of the fluidization disk. The fluidization net of the original NPD sender fluidization disk is woven from polyester fibers, which has poor strength and is easily blown apart by compressed air. After being blown apart, the finished product enters the fluidization disk through the damaged fluidization net along the air outlet of the fluidization disk. Since the limestone finished products produced by the desulfurizer plant are irregular rhombus particles, most of the finished products entering the fluidization disk cannot be blown out. As the finished products continue to enter and remain in the fluidization disk, the fluidization efficiency gradually decreases, and even loses the fluidization function. The small number of finished products that can be blown out will cause wear to the air outlet of the fluidization disk during the blowing process. Therefore, in recent years, in order to ensure the normal production of the desulfurizer plant and the normal supply of limestone powder to the power plant, the desulfurizer plant has regularly inspected the fluidization disk of the sending warehouse and replaced the fluidization net. Although regular maintenance can solve the problems of reduced fluidizing efficiency of the fluidizing disk and reduced conveying capacity of the transmitter, the maintenance frequency is high, the maintenance cost is relatively high, and it also causes a certain amount of unplanned shutdown.

[0007] The invention is an improvement based on the above technical problems. Summary of the invention

[0008] The present invention aims at the related problems in the background technology and provides an improved material conveying system, which improves the problems of inaccurate material conveying and metering in the metering bin and the easy damage of the fluidizing disk and fluidizing net in the sending bin, so as to facilitate the conveying of limestone powder.

[0009] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0010] An improved material conveying system, comprising a finished product bin, a metering bin and a sending bin connected in sequence from top to bottom, wherein a plurality of metering bins are arranged under the finished product bin, and a sending bin is arranged under each metering bin, wherein the finished product bin is connected to the metering bin through a first conveying pipeline, and the metering bins are connected through a second conveying pipeline, and a bulk material dispensing device is arranged at the entrance of the first conveying pipeline near the metering bin;

[0011] The lower part of the metering bin is connected to the air blowing pipeline;

[0012] The finished product warehouse and the metering warehouse are connected with a first pressure balancing pipeline, and the metering warehouse and the corresponding sending warehouse are connected with a second pressure balancing pipeline;

[0013] A fluidizing plate is provided at the lower part of the sending bin, and a fluidizing net formed by sintering multiple layers of stainless steel nets is provided in the fluidizing plate.

[0014] Furthermore, the bulk material distributor comprises a bulk material circular tube and a bulk material rack, wherein the bulk material rack is rotatably connected to the bulk material circular tube; the bulk material rack comprises rotating paddles, a support rod, and a folding bulk material rod, wherein a plurality of the rotating paddles are fixedly connected to the top end of the support rod, a plurality of the folding bulk material rods are circumferentially arranged on the periphery of the support rod, and the two ends of the folding bulk material rod are respectively fixedly connected to the upper end and the lower end of the support rod.

[0015] Furthermore, a slide rail is fixedly provided at the middle portion of the inner side of the bulk material circular tube.

[0016] Furthermore, the slide rail is a convex rail.

[0017] Furthermore, the bulk material rack also includes a pulley support frame and a pulley, one end of the pulley support frame is fixedly connected to the bent end of the folded bulk material rod, and the other end is connected to the pulley, and the pulley cooperates with the slide rail.

[0018] Furthermore, the folding bulk material rod and the support rod form an isosceles triangle, and two sides of the folding bulk material rod are isosceles sides.

[0019] Furthermore, the pulley support frame is a C-shaped structure.

[0020] Furthermore, the fluidizing net is formed by welding at least three fan-shaped fluidizing sub-nets.

[0021] Furthermore, each of the metering bins is located on an independent support structure, which includes a circular ring, a ring beam and a number of columns. The columns are located between the circular ring and the ring beam, and their two ends are welded and fixed to the circular ring and the ring beam. The circular ring is fixed to the concrete foundation at the bottom of the sending bin by reinforced concrete.

[0022] Furthermore, the center lines of the circular ring, the ring beam, the upper bracket of the weighing module, the weighing module, the base bracket, and the center lines surrounded by the plurality of columns are located on the same straight line.

[0023] Beneficial effects of the present invention:

[0024] (1) The bulk material distributor in the first conveying pipeline can fully disperse the materials and reduce the material discharge speed, so that the materials will not be compacted after entering the metering bin, and the friction between the materials themselves and the metering bin is greatly reduced; when the materials are discharged from the metering bin to the sending bin, the material flow effect is good, the speed is fast, and no materials will remain in the metering bin;

[0025] (2) The bracket structure of the metering bin is improved from an integrated type to an independent type, and the arrangement of various structures ensures that the center lines of the ring, the ring beam, the upper bracket of the weighing module, the weighing module, the base bracket and the center lines of the plurality of columns surrounding the ring are located on the same straight line, thus solving the metering problems such as poor metering accuracy, linear error, repeatability error, zero return error and mutual influence between bins in the metering bin;

[0026] (3) The fluidizing net of the fluidizing disk is improved from a fluidizing net formed by a polyester woven net to a fluidizing net formed by sintering multiple layers of stainless steel metal nets, which greatly reduces the maintenance frequency and maintenance cost, improves the conveying capacity of the sending bin, ensures the stability of the sender operation, reduces the unplanned shutdown rate, and ensures normal production and normal supply of limestone powder to the power plant; and the stainless steel metal net is welded by three fan-shaped fluidizing sub-nets, which is convenient for processing;

[0027] (4) The setting of two pressure balancing pipelines in the system can further promote the feeding speed of limestone powder in the conveying system; the setting of the air blowing pipeline can blow 20-25° air flow into the sending bin to avoid the problem of limestone powder agglomeration caused by excessively high or low temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the improved material conveying system in the embodiment;

[0029] Figure 2 It is a schematic diagram of the perspective structure of the bulk material dispenser in the embodiment;

[0030] Figure 3 It is a three-dimensional perspective structural diagram of a bulk material dispenser in the embodiment;

[0031] Figure 4 It is a schematic diagram of the three-dimensional structure of the fluidizing disk in the embodiment;

[0032] Figure 5 It is a schematic diagram of the planar structure of the fluidizing disk in the embodiment;

[0033] Figure 6 It is a structural schematic diagram of the metering bin and the bracket structure in the embodiment in the state of coordinated use.

[0034] In the figure: 1. Finished product warehouse; 2. Measuring warehouse; 3. Sending warehouse; 4. Bulk feeder; 41. Bulk round pipe; 411. Slide rail; 42. Bulk rack; 421. Rotating paddle; 422. Support rod; 423. Folding bulk rod; 424. Pulley support frame; 425. Pulley; 5. Support structure; 51. Circular ring; 52. Ring beam; 53. Column; 54. Weighing module; 6. Fluidizing disk; 7. Fluidizing net; 8. First conveying pipeline connected; 9. Second conveying pipeline connected; 10. Air blowing pipeline; 11. First pressure balance pipeline; 12. Second pressure balance pipeline. DETAILED DESCRIPTION

[0035] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. The fixed connection relationship not clearly stated in the present invention can be one of welding, bonding, bolting, and clamping. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood through specific circumstances.

[0038] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0039] An improved material conveying system comprises a finished product warehouse 1, a metering warehouse 2 and a sending warehouse 3 connected in sequence from top to bottom, wherein the finished product warehouse 1 is provided with a plurality of metering warehouses 2, and each metering warehouse 2 is provided with a sending warehouse 3, the finished product warehouse 1 is connected to the metering warehouse 2 through a first conveying pipeline 8, and the metering warehouse 2 is connected through a second conveying pipeline 9.

[0040] In some embodiments, in order to improve the conveying capacity of the metering bin 2, a bulk material dispenser 4 is provided at the entrance of the first conveying pipeline close to the metering bin 2;

[0041] The bulk material dispensing device 4 comprises a bulk material circular tube 41 and a bulk material rack 42, wherein a slide rail 411 is fixedly arranged at the middle of the inner side of the bulk material circular tube 41; the bulk material rack 42 comprises a rotating paddle 421, a support rod 422, a folding bulk material rod 423, a pulley 425 support rack 424 and a pulley 425, wherein two rotating paddles 421 are fixedly connected to the top of the support rod 422; six folding bulk material rods 423 are evenly distributed in an annular direction on the periphery of the support rod 422, and the two ends of each folding bulk material rod 423 are respectively fixedly connected to the upper end and the lower end of the support rod 422, and each pulley 425 support rack 424 is a C-shaped structure, wherein the outer side of the middle part is fixedly connected to the bent end of each folding bulk material rod 423, and a pulley 425 is arranged inside the C-shaped structure, and is connected to the pulley 425 The slide rail 411 is a convex track arranged around the inner wall of the bulk material circular tube 41, and the pulley 425 is slidably matched with the convex track.

[0042] The fixed connections involved in the structure of the bulk material container 4 are all welded.

[0043] When the finished product bin 1 discharges materials into the metering bin 2, the finished product bin 1 is at a relatively high position, and the gravitational potential energy of the materials inside it is relatively large. When the materials pass through the bulk material feeder 4, the material discharge drives the rotating paddle 421 to rotate, thereby driving the bulk material rack 42 to rotate as a whole, and then stirring the materials, slowing down the material discharge speed so that the materials will not be compacted due to rapid falling, reducing the adhesion of the materials to the metering bin 2, and making the metering bin 2 discharge materials to the sending bin 3 quickly and smoothly without any residue, thereby reducing the time of the circulating material transportation process and improving the working efficiency.

[0044] In some embodiments, in order to solve the problem of inaccurate measurement in the metering bin, the applicant first analyzes the causes of inaccurate measurement, as follows:

[0045] (1) The bracket of the weighing module of the metering bin includes an upper bracket and a base bracket. If the upper bracket and the base bracket are installed at an angle, lateral force will act on the sensor, affecting the accuracy and repeatability of the scale.

[0046] (2) The deflection of the weighing bin support structure is too large. Excessive deflection causes changes in the deflection of the inlet and outlet pipes of the weighing bin, resulting in linear errors. When the deflections at each point are inconsistent, repeatability errors and zero return errors due to creep may occur. That is, when weighing, the support around the weighing bin will bend. If the deflection is too large, it will affect the accuracy of the weighing and cause unstable readings.

[0047] (3) The structure of the metering bin is relatively soft and lacks rigidity. When weighing, it bends. Excessive deflection affects the accuracy of weighing and causes unstable readings.

[0048] (4) The center line of the load applied to the weighing module sensor cannot coincide with the center line of the weighing module bracket, that is, the concentricity of the weighing module and the ring beam is poor; and no reinforcing web is added to prevent the bracket from twisting when loaded, which affects the accuracy of the weighing and causes unstable readings.

[0049] (5) Adjacent metering bins are installed close to each other on the same common support structure, which causes interference during metering. This installation method is highly flexible and has a large mutual influence. Moreover, since the metering bin is relatively soft, it will cause a certain impact when objects approach.

[0050] (6) The first and second conveying pipelines are connected to the metering bin in a flexible manner. The upper and lower parts of the first and second conveying pipelines are disconnected, and the upper part is inserted into the lower part, leaving a gap around. The outside of the gap is wrapped with canvas. Although this connection method is a flexible connection, due to the eccentricity of the installation and the material entering the canvas through the gap and the solidification between the canvas and the pipe wall during unloading, the flexible connection becomes a hard connection, which generates tension and thrust on the metering bin, resulting in metering errors. In addition, the canvas is easily damaged and needs to be replaced frequently.

[0051] In order to avoid the problem of inaccurate measurement in metering bin 2, the improvement plan is as follows:

[0052] (1) After improvement, the support structure 5 of several metering bins 2 is completely independent, and a steel ring 51 is installed at the bottom of the structure to be fixed to the concrete foundation at the bottom of the sending bin 3 through reinforced concrete with minimal deflection, and is installed after accurate measurement to ensure its horizontality and concentricity.

[0053] (2) The center line of the three columns 53 is aligned with the center line of the ring 51. After measurement, the concentricity and verticality are ensured. After installation, they are welded to the ring 51 and four reinforcement plates are welded to the front, back, left and right to ensure deflection.

[0054] (3) The I-beam ring beam 52 is installed horizontally on the three columns. The center line of the ring beam 52 coincides with the center line of the three columns. The horizontality and concentricity are ensured through measurement. After installation, four reinforcing plates are welded to the front, back, left and right sides of the three columns to ensure deflection.

[0055] (4) The metering bin 2 is placed in the I-beam ring beam 52 at a pre-measured height, and its concentricity and verticality are ensured through measurement.

[0056] (5) The weighing module 54 and the bracket are installed. The angle between the upper bracket and the base bracket of the weighing module 54 and the horizontal line is less than 0.5°, and the deflection (bending) of the base bracket and the upper bracket is consistent.

[0057] (6) Place the weighing module 54 with the upper bracket and the base bracket installed on the I-beam ring beam 52 on the column. The center of gravity of the weighing module 54 coincides with the center line of the ring beam 52. Use a spirit level to measure the horizontality and verticality. Weld the upper bracket to the metering bin 2 and the I-beam ring beam 52. Add 4 webs between the base bracket and the I-beam ring beam 52 for welding.

[0058] (7) Fully weld all welding areas.

[0059] (8) Completely disconnect the upper and lower parts of the first and second conveying pipelines, make the upper and lower parts concentric, and then replace the original canvas flexible connection with a rubber flexible connection.

[0060] The above improvement scheme solves the measurement problems of poor measurement accuracy, linear error, repeatability error, zero return error, mutual influence between bins, and other measurement problems of metering bin 2, as well as related problems of soft connection. After the transformation, the calibration error range meets the requirements (2kg ≤e≥-2kg), the soft connection is not easy to damage and is easy to replace, ensuring the normal operation and use of the equipment.

[0061] In some embodiments, in order to solve the problem of fragility of the fluidizing net 7 on the existing fluidizing plate 6 , the fluidizing net 7 of the fluidizing plate 6 is sintered by at least 10 layers of stainless steel metal mesh, and its size is customized according to the size of the sending bin 3 .

[0062] Moreover, the fluidizing net 7 is welded by three fluidizing sub-nets, and the fluidizing sub-net is made by cutting a 0.4 mm metal mesh (material 304) into a fan shape, sintering 10 layers of fan-shaped metal mesh, and welding and splicing the sintered three fan-shaped plates into a conical ring 51. The inner and outer welding flanges of the ring 51 are used for bolt connection with the fluidizing disk.

[0063] The stainless steel sintered fluidized bed net 7 has a thickness of 4 mm, a height of 85 mm, and a filtering accuracy of 50 μm.

[0064] After the transformation, the fluidized net 7 of the fluidized disk 6 greatly reduces the maintenance frequency and maintenance cost, improves the conveying capacity of the sending bin 3, ensures the stability of the transmitter operation, reduces the unplanned shutdown rate, and ensures normal production and normal supply of limestone powder to the power plant. The relevant data before and after the transformation are compared in the table below.

[0065]

[0066] The improved fluidized net has the following advantages:

[0067] (1) Good strength and good rigidity: It has extremely high mechanical strength and compressive strength, good processing, welding and assembly performance, and is easy to use.

[0068] (2) Uniform and stable precision: Uniform and consistent fluidization performance can be achieved for all fluidization accuracies, and the mesh size does not change during use.

[0069] (3) Wide range of use environments: can be used in temperature environments of -200℃-600℃ and acid-base environments.

[0070] (4) Excellent cleaning performance: It has good countercurrent cleaning effect, can be used repeatedly, and has a long service life (it can be cleaned by countercurrent water, ultrasonic, dissolution, baking, etc.).

[0071] In some embodiments, in order to further improve the conveying capacity of the metering bin 2 and the sending bin 3, the lower part of the metering bin 2 is connected to the blowing pipeline 10, and the blowing pipeline 10 can blow in a 20-25° airflow to avoid the problem of limestone powder agglomeration caused by excessively high or low temperature.

[0072] A first pressure balancing pipeline 11 is connected between the finished product warehouse 1 and the metering warehouse 2, and a second pressure balancing pipeline 12 is connected between the metering warehouse 2 and the corresponding sending warehouse 3; the provision of these two pressure balancing pipelines further promotes the unloading speed of limestone powder in the conveying system.

[0073] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. An improved material conveying system, characterized in that: It comprises a finished product warehouse, a metering warehouse and a sending warehouse connected in sequence from top to bottom, the finished product warehouse is provided with a plurality of the metering warehouses, each of the metering warehouses is provided with a sending warehouse, the finished product warehouse is connected with the metering warehouse through a first conveying pipeline, the metering warehouses are connected through a second conveying pipeline, and a bulk feeder is provided at the entrance of the first conveying pipeline near the metering warehouse; The lower part of the metering bin is connected to the air blowing pipeline; The finished product warehouse and the metering warehouse are connected with a first pressure balancing pipeline, and the metering warehouse and the corresponding sending warehouse are connected with a second pressure balancing pipeline; A fluidizing plate is provided at the lower part of the sending bin, and a fluidizing net formed by sintering multiple layers of stainless steel nets is provided in the fluidizing plate; The bulk material dispensing device comprises a bulk material circular tube and a bulk material rack, wherein the bulk material rack is rotatably connected to the bulk material circular tube; the bulk material rack comprises a rotating blade, a support rod, and a folding bulk material rod, wherein a plurality of the rotating blades are fixedly connected to the top of the support rod, a plurality of the folding bulk material rods are circumferentially arranged on the periphery of the support rod, and the two ends of the folding bulk material rod are respectively fixedly connected to the upper end and the lower end of the support rod; A slide rail is fixedly arranged at the middle of the inner side of the bulk material circular tube; the bulk material rack further comprises a pulley support frame and a pulley, one end of the pulley support frame is fixedly connected to the bent end of the folded bulk material rod, and the other end thereof is connected to the pulley, and the pulley cooperates with the slide rail; The fluidizing net is formed by welding at least three fan-shaped fluidizing sub-nets.

2. An improved material conveying system according to claim 1, characterized in that: The slide rail is a convex rail.

3. An improved material conveying system according to claim 1, characterized in that: The folding bulk material rod and the support rod form an isosceles triangle, and two sides of the folding bulk material rod are isosceles sides.

4. An improved material conveying system according to claim 1, characterized in that: The pulley support frame is a C-shaped structure.

5. An improved material conveying system according to claim 1, characterized in that: Each of the metering bins is located on an independent support structure, which includes a circular ring, a ring beam and a number of columns. The columns are located between the circular ring and the ring beam, and their two ends are welded and fixed to the circular ring and the ring beam. The circular ring is fixed to the concrete foundation at the bottom of the sending bin by reinforced concrete.

6. An improved material conveying system according to claim 5, characterized in that: The center lines of the circular ring, the ring beam, the upper bracket of the weighing module, the weighing module, the base bracket and the center lines surrounded by the plurality of columns are located on the same straight line.

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