Airflow adjusting device of mechanical pulverizer

Abstract

An airflow adjusting device of a mechanical pulverizer is arranged on a cover plate in the outlet direction of a pulverizer grading device. Comprising an air hole adjusting plate, and a plurality of first air holes are formed in the air hole adjusting plate; a plurality of second air holes in one-to-one correspondence with the first air holes are formed in the cover plate, and the second air holes are communicated with an outlet of the grading device; the butt joint state of the first air hole and the second air hole is adjusted by rotating the air hole adjusting plate, so that the first air hole and the second air hole are completely or partially butt-jointed. The airflow adjusting device is simple in structure, convenient and fast to operate and capable of adjusting airflow for materials of different batches and different densities, so that the productivity is increased, the loss is reduced, the airflow sealing flow is effectively reduced, more flow is used for material conveying, and the conveying efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of mechanical crushers, and in particular to an airflow regulating device for a mechanical crusher. Background Technology

[0002] Currently, no effective solution has been found for air-tight flow regulation in the field of mechanical crushers. Different material characteristics and environmental factors can lead to uneven airflow control. Excessive redundant airflow often exists at the air seal between the grading device and the material outlet, affecting overall production capacity and increasing energy loss. Because the airflow within existing crushers cannot be flexibly adjusted, the equipment cannot adapt to different batches of materials. Especially when material density increases or air pressure rises, the original airflow exhibits a linear relationship, thus impacting production capacity and energy efficiency.

[0003] CN106076561A discloses an airflow pulverizer with continuously adjustable particle size, comprising a casing, a power unit, a pulverizing chamber, a classifying device, an airflow regulating device, a feed pipe, and a finished product discharge pipe. The power unit, pulverizing chamber, classifying device, and airflow regulating device adopt a modular, easily detachable structure. The pulverizing chamber is located below the airflow regulating device, with its side connected to an air compressor and a Laval nozzle. Its top is connected to the airflow regulating device via a central pipe. When powder is carried into the classifying device by the rising airflow in the central pipe, it is sorted by the airflow regulating device. The airflow regulating device consists of an adjusting cone, a handwheel installed outside the casing, and an adjuster driven by the handwheel to move the adjusting cone up and down. The size and direction of the airflow can be adjusted continuously as needed by adjusting the size of the adjusting cone to ensure that the particle size of the powder meets the user's requirements. However, this patent uses a gap cone to adjust the airflow size, which requires complex mechanical components (such as dials and levers) for adjustment. The adjustment process may be relatively cumbersome and may require high mechanical maintenance. Moreover, relying on the gear transmission of the dials and levers, this mechanical control method is prone to certain errors and is not very accurate. Utility Model Content

[0004] The purpose of this utility model is to overcome the above-mentioned shortcomings of the prior art and provide an airflow regulating device for a mechanical crusher that is simple in structure, easy to operate, and flexible in adjustment.

[0005] The technical solution of this utility model is: an airflow regulating device for a mechanical pulverizer, which is set on a cover plate in the direction of the outlet of the pulverizer grading device; it includes an air hole regulating plate, on which a plurality of first air holes are opened; on the cover plate, a plurality of second air holes are opened, each corresponding to one of the first air holes, and the second air holes are connected to the outlet of the grading device; by rotating the air hole regulating plate, the docking state of the first air holes and the second air holes is adjusted so that they are fully or partially docked.

[0006] Furthermore, several first vents are arranged circumferentially along the vent adjustment plate.

[0007] Furthermore, the air hole adjustment plate is also provided with a plurality of waist holes arranged around the periphery of the first air hole; a stop is provided at a predetermined position in each waist hole to limit the range of movement of the waist hole, and the cross-sectional size of the first air hole is adjusted by changing the position of the waist hole.

[0008] Furthermore, a number of circumferentially arranged first air holes are divided into N equal parts along a predetermined bisector, where N≥2; each waist hole is located on the corresponding bisector, and the center point of the waist hole coincides with the corresponding bisector.

[0009] Furthermore, at least one stop within the waist hole is located at the center point of the waist hole.

[0010] Furthermore, at least one stop within the waist hole is located at the end of the waist hole.

[0011] Furthermore, at least one stop in the waist hole is located at the center point of the waist hole, and at least one stop in the waist hole is located at the end of the waist hole.

[0012] Furthermore, the angle of deviation of the stop inside the waist hole from the center point of the waist hole is 0°~1.5°.

[0013] Furthermore, taking the waist hole corresponding to the stop offset angle of 0° as the reference, the stop offset angles of other waist holes arranged in a clockwise or counterclockwise direction are sequentially increased or decreased.

[0014] Furthermore, the plurality of waist holes are arranged around the outer periphery of several air holes.

[0015] Furthermore, the stop element is a bolt, a stop pin, a stop post, or a stop block.

[0016] The beneficial effects of this utility model are as follows: On the one hand, by rotating the air hole adjustment plate to adjust the cross-sectional size of the first air hole, the structure is simple and the operation is convenient. It can adjust the airflow for materials of different batches and densities, thereby increasing the production capacity, reducing losses, and effectively reducing the air seal flow rate, so that more flow rate is used for material conveying, thereby improving the conveying efficiency. On the other hand, by setting the waist hole and the stop, the first air hole can be precisely adjusted, and the operation becomes more convenient. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this utility model;

[0018] Figure 2 This is a schematic diagram of the specific structure of the vent adjustment plate in Embodiment 1 of this utility model;

[0019] Figure 3This is a structural schematic diagram of Embodiment 2 of the present invention;

[0020] Figure 4 yes Figure 3 Side view of embodiment 2 shown;

[0021] Figure 5 yes Figure 4 An enlarged schematic diagram of part A in Embodiment 2 is shown;

[0022] Figure 6 This is a schematic diagram of the second preferred embodiment of the vent adjustment plate of Embodiment 2 of this utility model;

[0023] Figure 7 This is a schematic diagram of the specific structure of the vent adjustment plate in Embodiment 3 of this utility model.

[0024] Explanation of reference numerals in the attached diagram:

[0025] 1. Air vent adjustment plate; 2. Material outlet; 3. Cylinder body; 4. Grading wheel; 5. Discharge channel; 6. Upper cover plate; 7. Lower cover plate; 8. Second air vent; 11. First air vent; 12. Waist hole; 13. Stop bolt. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Example 1

[0028] like Figure 1 and Figure 2 As shown: An airflow regulating device for a mechanical crusher is provided between the grading device of the crusher and the material outlet 2; it includes an air hole regulating plate 1, on which a plurality of circumferentially arranged first air holes 11 are provided.

[0029] Specifically, the crusher's cylinder 3 is equipped with a grading device, typically a grading wheel 4, used for screening materials. A discharge channel 5 is connected to the top of the cylinder 3, and a material discharge port 2 is connected to one side of the discharge channel 5. A cover plate is provided between the end of the cylinder 3 and the discharge channel 5. For example, a lower cover plate 7 is provided at the upper end of the cylinder 3, and an upper cover plate 6 is provided at the lower end of the discharge channel 5. The upper and lower cover plates are bolted together to form the cover plate. The air vent adjustment plate 1 is preferably a circular plate with a certain thickness, allowing it to fit tightly against the upper cover plate 6. The central hole of the air vent adjustment plate 1 is fitted onto the outer edge of the discharge channel 5 and located on the surface of the upper cover plate 6. The cover plate has second air vents 8 at positions corresponding to each of the first air vents 11. That is, the upper cover plate 6 and the lower cover plate 7 have interconnected second air vents 8, and each first air vent 11 corresponds one-to-one with a second air vent 8, with the same size, ensuring that the first air vent 11 is connected to the grading device and the material discharge port 2 through the second air vent 8. The vent adjustment plate 1 can directly contact the upper cover plate 6 without being fixed, thus allowing the vent adjustment plate 1 to rotate freely.

[0030] The working principle of this embodiment is as follows: After being screened by the grading wheel 4, the material is divided into larger and smaller particles according to their particle size. The connection state between the first air hole 11 and the second air hole 8 is adjusted by rotating the air hole adjustment plate 1, so that they are fully or partially connected. For example, by rotating, the first air hole 11 can be completely connected to its corresponding second air hole 8, or the first air hole 11 can be partially offset from the second air hole 8, that is, part of the first air hole 11 is blocked by the upper cover plate 6, while the other part is connected to the second air hole 8. This changes the cross-sectional size of the air holes to control the intensity and direction of the airflow. The airflow acts on the screened material through the air hole adjustment plate 1, helping the lighter, finer particles to be carried away by the airflow and guided to the material outlet 2, while the larger particles, due to gravity, cannot be carried away by the airflow and remain in the grading device. In this way, by controlling the airflow, the grading device can effectively separate and discharge materials of different particle sizes.

[0031] This embodiment features a simple structure, requiring only a single air vent adjustment plate 1 with a first air vent 11 to achieve airflow regulation. On one hand, by adjusting the opening and closing state of the air vent, optimized airflow control can be achieved under different material batches and environmental factors. When material density increases, adjusting the intensity and direction of the airflow effectively maintains the pulverizer's efficiency, preventing excessive airflow that could lead to unnecessary energy waste or reduced production capacity. Especially during material changes or density variations, dynamic airflow adjustment helps reduce excessive airflow and improve energy efficiency. On the other hand, by changing the connection state of the air vents, the airflow intensity can be adjusted according to materials of different particle sizes, preventing excessive or insufficient airflow during the grading process and ensuring proper separation of materials of different particle sizes.

[0032] Example 2

[0033] like Figures 3-5 As shown: Based on Example 1, this example also adds a waist hole 12 and a stop to the air hole adjustment plate 1.

[0034] Specifically, the air vent adjustment plate 1 has multiple waist holes 12 arranged around the periphery of several first air holes 11. Each waist hole 12 has a stop at a predetermined position to limit its movement range. By changing the position of the waist holes 12, the cross-sectional size of the first air holes 11 can be adjusted. The cooperation between the waist holes 12 and the stop on the air vent adjustment plate 1 improves the accuracy of airflow control. That is, by changing the position of the waist hole 12 relative to the stop, the degree of connection between the first air hole 11 and the second air hole 8 can be adjusted, thereby changing the cross-sectional size of the first air hole 11. The position of the stop ensures that the waist holes 12 can only move within a certain range. When the air vent adjustment plate 1 is rotated, the stop restricts the waist holes 12 from exceeding the predetermined movement range. Thus, the movement range of the waist holes 12 is limited to a precise interval, ensuring that the cross-sectional size of the first air hole 11 does not have excessively large or small errors. The position of the stop in this embodiment can be set according to actual needs to precisely set the maximum and minimum displacement of the waist hole 12, thereby directly affecting the cross-sectional size of the first air hole 11. Whenever the position of the waist hole 12 changes, the airflow adjustment will also change accordingly. The position setting of the stop determines the maximum or minimum adjustable cross-sectional size of the first air hole 11. In addition, the position of the stop on the air hole adjustment plate 1 ensures that the waist hole 12 can return to a consistent adjustment range each time it is adjusted. No matter how many times the air hole adjustment plate 1 is operated, the setting of the stop ensures that the change of the cross-section of the first air hole 11 is stable and repeatable, and will not cause instability in airflow control due to operational errors.

[0035] The following is the first preferred embodiment of this example:

[0036] In this embodiment, the first air holes 11 on the adjusting air vent plate are divided into six equal parts, and several first air holes 11 are provided in each part. Six waist holes 12 are also provided, surrounding the outer periphery of the first air holes 11. Preferably, in this embodiment, the first air holes 11 on the adjusting air vent plate are divided into six equal parts by three equal bisectors, and the six waist holes 12 are all located on the corresponding bisectors, that is, two waist holes 12 correspond to each bisector, and the center point of each waist hole 12 coincides with the corresponding bisector. For example, the six waist holes 12 are located at positions of 0°, 60°, 120°, 180°, 240°, and 300° on the adjusting air vent plate, respectively.

[0037] In this embodiment, the preferred stopper is a stop bolt 13, which extends into the waist hole 12 and is fixed to the air hole adjusting plate 1; alternatively, the stop bolt passes through the air hole adjusting plate 1 and is fixed inside the upper cover plate 6, and the design width of the waist hole 12 is greater than that of the stop bolt 13, so as not to obstruct the rotation of the air hole adjusting plate 1. There are a total of 6 stop bolts 13, one stop bolt 13 corresponding to each waist hole 12. Preferably, the stop bolt 13 is located at the center point of the waist hole 12. When the waist hole 12 rotates clockwise or counterclockwise, it touches the stop bolt 13 and is stopped. When the vent adjustment plate 1 is rotated clockwise, the position of the waist hole 12 relative to the stop bolt 13 changes, and the cross-section of several first vents 11 changes. For example, several first vents 11 gradually change from being fully connected with the second vent 8 to being partially connected, until all waist holes 12 touch their respective stop bolts 13 and are then limited. The vent adjustment plate 1 can no longer rotate, and the position of the limit must ensure that all first vents 11 and second vents 8 always maintain a certain degree of connectivity and cannot be completely disconnected.

[0038] It can be said that by setting the waist hole 12 and the stop bolt 13, the operation becomes more convenient compared to Embodiment 1, and the operator no longer needs to judge which position to rotate to to achieve precise cut-off adjustment.

[0039] like Figure 6 As shown, the following is the second preferred embodiment of this example: the center point of each waist hole 12 coincides with the corresponding bisector line, and the stop bolt 13 in five waist holes 12 is located at the center point of the corresponding waist hole 12, while the stop bolt 13 in one waist hole 12 is located at the end of the waist hole 12, which is equivalent to the stop bolt 13 being set off from the center point of the waist hole 12. One advantage of this setting is that when the air hole adjusting plate 1 is not working, it can be adjusted to the position where the end of the waist hole 12 is limited by the stop bolt 13, thereby ensuring that the stop bolt 13 in the other five waist holes 12 can be accurately located at the center point of the waist hole 12. This method avoids the complexity of manual judgment and improves the accuracy and efficiency of the adjustment process.

[0040] Example 3

[0041] like Figure 7 As shown: The difference from Embodiment 2 is that the stop bolt 13 in this embodiment is set off from the center point of the corresponding waist hole 12.

[0042] For example, the six waist holes 12 are defined as 1# to 6#. The stop bolt 13 in waist hole 1# is positioned at the center point of the hole, equivalent to an offset angle of 0°. Using waist hole 1# as a reference, the offset angles of the stop bolts 13 in the other five waist holes arranged clockwise increase sequentially, i.e., the offset angles are 0.3°, 0.6°, 0.9°, 1.1°, and 1.5° respectively. The offset angle refers to the angle formed by the line connecting the center point of the stop bolt 13 to the center point of the corresponding waist hole 12, and the line connecting the dot of the air vent adjustment plate 1. For example, when the offset angle of the stop bolt 13 in waist hole 1# is 0°, and the offset angle is 0.3°, it means that the stop bolt 13 in waist hole 2# has shifted clockwise, with a slight change in position. When the offset angle increases to 1.5°, it means that the stop bolt 13 in waist hole 6# has shifted exactly to the end of the waist hole 12, reaching its maximum offset position.

[0043] The advantages of this setup are twofold. First, when the vent adjustment plate 1 is not in operation, it is first adjusted to a position where the end of the waist hole 6# is limited by the stop bolt 13, thus ensuring that the stop bolt 13 of the waist hole 1# can be precisely located at the center point of the waist hole 12. This method avoids the complexity of manual judgment and improves the accuracy and efficiency of the adjustment process. When the vent adjustment plate 1 is rotated clockwise, the waist hole 1# is first limited by the stop bolt 13, thus preventing the vent adjustment plate 1 from rotating further. For example, this position can make the cross-sectional area of ​​the first vent 11 the smallest. Then, when the vent adjustment plate 1 is rotated counterclockwise, the waist hole 6# will be first limited by the stop bolt 13. This position can make the cross-sectional area of ​​the first vent 11 the largest, which is equivalent to being fully connected with the second vent 8. On the other hand, except for the stop bolts 13 in the waist holes 1# and 6# which need to be positioned precisely, the stop bolts 13 in the waist holes 2# to 5# can be set arbitrarily within the offset angle range of 0° to 1.5°, thereby greatly reducing the precision requirements for the position of the stop bolts 13.

[0044] In summary, this utility model has two advantages. First, by rotating the air hole adjustment plate to adjust the cross-sectional size of the first air hole, the structure is simple and can adjust the airflow for materials of different batches and densities, thereby increasing production capacity, reducing losses, and effectively reducing the air seal flow rate, so that more flow can be used for material conveying, thereby improving conveying efficiency. Second, by setting the waist hole and the stop, the first air hole can be precisely adjusted, and the operation becomes more convenient.

[0045] Furthermore, the term "connection" should be interpreted broadly, for example, it can include fixed connections, detachable connections, or integral connections; it can include direct connections or indirect connections through an intermediate medium, and it can also include internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0047] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. An airflow regulating device for a mechanical pulverizer, disposed on a cover plate in the direction of the outlet of the pulverizer's grading device; characterized in that, It includes an air vent adjustment plate, on which a plurality of first air vents are provided; and a cover plate is provided with a plurality of second air vents corresponding one-to-one with the first air vents, the second air vents being connected to the outlet of the grading device; by rotating the air vent adjustment plate, the docking state of the first air vents and the second air vents is adjusted so that they are fully or partially docked.

2. The airflow regulating device for the mechanical pulverizer according to claim 1, characterized in that, Several first vents are arranged circumferentially along the vent adjustment plate.

3. The airflow regulating device for the mechanical pulverizer according to claim 2, characterized in that, The vent adjustment plate is also provided with a plurality of waist holes arranged around the periphery of the first vent; a stop is provided at a predetermined position in each waist hole to limit the range of movement of the waist hole, and the cross-sectional size of the first vent is adjusted by changing the position of the waist hole.

4. The airflow regulating device for the mechanical pulverizer according to claim 3, characterized in that, A number of circumferentially arranged first air holes are divided into N equal parts along a predetermined bisector, where N≥2; each waist hole is located on the corresponding bisector, and the center point of the waist hole coincides with the corresponding bisector.

5. The airflow regulating device for the mechanical pulverizer according to claim 3 or 4, characterized in that, At least one stop within the waist hole is located at the center point of the waist hole.

6. The airflow regulating device for the mechanical pulverizer according to claim 3 or 4, characterized in that, At least one stop within the waist hole is located at the end of the waist hole.

7. The airflow regulating device for the mechanical pulverizer according to claim 3 or 4, characterized in that, At least one stop in the waist hole is located at the center point of the waist hole, and at least one stop in the waist hole is located at the end of the waist hole.

8. The airflow regulating device for the mechanical pulverizer according to claim 3 or 4, characterized in that, The angle of deviation of the stop inside the waist hole from the center point of the waist hole is 0°~1.5°.

9. The airflow regulating device for the mechanical pulverizer according to claim 8, characterized in that, Taking the waist hole corresponding to the stop offset angle of 0° as the reference, the stop offset angles of other waist holes arranged in a clockwise or counterclockwise direction increase or decrease sequentially.

10. The airflow regulating device for the mechanical pulverizer according to claim 3 or 4, characterized in that, The plurality of waist holes are arranged around the outer periphery of several air holes; the stop is a bolt, a stop pin, a stop post or a stop block.

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