A tobacco leaf material turning device

Abstract

The present invention discloses a tobacco leaf material turning device, which includes a turning roller and a guide plate. The turning roller is arranged between an upstream conveying device and a downstream conveying device, and is configured to rotate from the upstream conveying device to the downstream conveying device, for turning the tobacco leaves from the upstream conveying device and conveying them to the downstream conveying device, and multiple rows of rake nails are evenly distributed thereon; the guide plate is fixedly arranged between the upstream conveying device and the downstream conveying device, and is configured in a comb shape adapted to the rake nails, and its cross-section is a gradient curve that gradually changes from the upstream conveying device to the downstream conveying device. When turning, the tobacco leaves move along the outer side of the guide plate; this tobacco leaf material turning device realizes the turning of the tobacco leaves in the same direction as the conveying direction, avoids the problem that the existing turning device needs to reverse twice, and can avoid the problem of tobacco leaf entanglement when only relying on the turning roller for turning.

Description

Technical Field

[0001] The present invention relates to the technical field of tobacco leaf pretreatment, and particularly relates to a device for turning over tobacco leaf materials. Background Art

[0002] In tobacco leaf processing and threshing and redrying production lines, due to the stacking of tobacco leaves, there will be problems such as a large difference in material indexes between the middle layer and the outer layer, or when screening sand, the contact surface between the tobacco leaves and the screening sand roller is relatively clean, while the screening effect of the non-contact surface is relatively poor.

[0003] In Chinese Patent CN102389159A, a method and device for removing impurities in tobacco leaves in the pretreatment stage of threshing and redrying are disclosed, which uses the method of dropping and reverse conveying of tobacco leaves for turning over. This reverse conveying method can indeed turn over most of the tobacco leaves, but it is opposite to the overall process flow direction. Therefore, secondary reverse is still required to ensure that the material conveying direction is consistent with the overall process flow direction. Such a two-time reverse structure will bring a series of problems such as an increase in equipment height, a more complex mechanism, and difficult maintenance. Summary of the Invention

[0004] In view of the above problems, the inventor provides a device for rotating and turning over tobacco leaves, which realizes the function of turning over tobacco leaves in the same direction as the conveying direction.

[0005] The present invention provides a device for turning over tobacco leaf materials, including:

[0006] A turning-over roller, which is arranged between the upstream conveying device and the downstream conveying device, is configured to rotate from the upstream conveying device to the downstream conveying device, and is used for turning over the tobacco leaves from the upstream conveying device and conveying them to the downstream conveying device. A plurality of rows of rake nails are provided on it, and the plurality of rows of rake nails are evenly distributed along the circumferential direction of the turning-over roller;

[0007] A guide plate, which is fixedly arranged between the upstream conveying device and the downstream conveying device, is configured to be in a comb-tooth shape adapted to the rake nails, and its cross-section is a gradually changing curve that gradually changes from the upstream conveying device to the downstream conveying device.

[0008] The guide plate includes:

[0009] A horizontal part, which is arranged at one end close to the upstream conveying device;

[0010] A gradually changing part, which gradually extends from the end of the horizontal part along the roller surface of the turning-over roller to the downstream conveying device;

[0011] The gradually changing part includes:

[0012] An arc segment, which extends from the end of the horizontal part to the highest point of the turning-over roller;

[0013] An extension segment, which extends from the end of the arc segment to the downstream conveying device, and the distance between it and the roller surface of the turning-over roller gradually increases.

[0014] Working principle of the present invention:

[0015] When the tobacco leaves are conveyed from the upstream conveying device to the turning roller station, the turning roller rotates to drive the rake nails to rotate the tobacco leaves, and the tobacco leaves move along the outside of the guide plate at the same time. During the turning process, the length of the protruding rake nails gradually decreases, and the tobacco leaves are thrown out along the outside of the guide plate and fall on the downstream conveying device for further processing.

[0016] The tobacco leaves slide out from the outside of the guide plate, while the rake nails retract from the comb slots of the guide plate.

[0017] Beneficial effects of the present invention compared with the prior art:

[0018] (1) The tobacco leaf material turning device provided by the present invention realizes the turning of tobacco leaves in the same direction as the conveying direction, avoids the problem of the need for secondary reverse of the existing turning device, and has the advantages of simplifying the equipment structure, reducing the equipment height, and facilitating the bus layout.

[0019] (2) By setting the guide plate, the problem of tobacco leaf entanglement that occurs when relying only on the turning roller for turning can be effectively avoided.

[0020] (3) This device is widely used in process sections such as tobacco leaf screening, baking, and cut tobacco rewetting. By turning the tobacco leaves, the opportunity for each side of the tobacco leaves to receive process treatment more evenly is increased, and the uniformity of material indicators can be improved. Description of the drawings

[0021] Figure 1 It is a schematic structural diagram of the tobacco leaf material turning device in Embodiment 1;

[0022] Figure 2 It is a schematic diagram of the turning roller in Embodiment 1;

[0023] Figure 3 It is a schematic structural diagram of the guide plate in Embodiment 1;

[0024] Figure 4 It is a cross-sectional view in Embodiment 1.

[0025] Reference numerals:

[0026] 1 - Upstream conveying device; 2 - Downstream conveying device; 3 - Turning roller; 31 - Rake nail; 4 - Guide plate; 41 - Horizontal part; 42 - Arc section; 43 - Extension section. Detailed implementation manners

[0027] The present invention will be further described in detail below in conjunction with the drawings through specific implementation manners.

[0028] Embodiment 1

[0029] AsFigure 1 As shown in the figure, the present invention provides a tobacco leaf material turning device, which is arranged between the upstream conveying device 1 and the downstream conveying device 2, and specifically includes: a turning roller 3 and a guide plate 4. In this embodiment, both the upstream conveying device 1 and the downstream conveying device 2 adopt a sieve roller type conveying device, and impurities attached to the surface of the tobacco leaves fall from the gaps between the roller paths during the conveying process. As Figure 2 shown in the figure, multiple rows of rake nails 31 are evenly distributed on the turning roller 3. The turning roller 3 is configured to rotate clockwise. While driving the rake nails 31 to rotate, the tobacco leaves from the upstream conveying device 1 are turned over and conveyed to the downstream conveying device 2. When the tobacco leaves are on the upstream conveying device 1, the back side of the tobacco leaves is screened. After being turned over, the downstream conveying device 2 screens the front side of the tobacco leaves. Through the turning roller 3, the turning of the tobacco leaves in the same direction as the conveying direction is realized, avoiding the problem that the existing turning device needs to reverse twice.

[0030] In order to prevent the tobacco leaves from winding around the rake nails 31 and at the same time throw the tobacco leaves out, a guide plate 4 with comb slots is arranged outside the turning roller 3. Each rake nail 31 corresponds to each comb slot of the guide plate 4, and the rake nail 31 can pass through the comb slot. Specifically, as Figures 3 - 4 shown in the figure, the guide plate 4 includes a horizontal part 41 and a gradual change part. The horizontal part 41 extends from one end close to the outlet of the upstream conveying device 1 to the position of the roller surface of the turning roller 3. The gradual change part includes: an arc section 42 and an extension section 43. The arc section 42 extends along the roller surface of the turning roller 3 from the end of the horizontal part to the highest point of the turning roller 3, which is approximately 1 / 4 of the circumference of the turning roller 3. The extension section 43 extends from the end of the arc section 42 to the downstream conveying device 2, and the distance between it and the roller surface of the turning roller 3 gradually increases, so that the height of the rake nail 31 extending out of the gradual change part gradually decreases during the rotation process until it is completely lower than the gradual change part. The gradual change part is used to guide the tobacco leaves during the turning process to ensure that the tobacco leaves can smoothly enter the downstream conveying device 2. In addition, since the rake nail 31 may insert into the tobacco leaves when the tobacco leaves enter the turning device from the upstream conveying device 1, during the process of the tobacco leaves turning along the guide plate 4, the guide plate 4 can separate the tobacco leaves from the rake nail 31, effectively improving the reliability of turning over.

[0031] Specifically, when turning over, the front side of the tobacco leaf faces upward and is driven by the upstream conveying device 1. When moving from left to right along the conveying direction, the tobacco leaf first falls on the horizontal part 41. Subsequently, the turning roller 3 rotates clockwise, driving the rake nails 31 to extend upward from the comb slots of the horizontal part 41, carrying the tobacco leaf upward and gradually turning along the outside of the gradual change part. When the rotation angle of the tobacco leaf reaches 180 degrees, that is, the front side of the tobacco leaf faces downward and the back side faces upward, the turning over of the tobacco leaf is completed.

[0032] The above uses specific examples to elaborate on the present invention, which is only used to help understand the present invention and is not used to limit the present invention. For those skilled in the technical field to which the present invention belongs, according to the idea of the present invention, several simple deductions, deformations or substitutions can also be made.

Claims

1. A tobacco leaf material turning device, characterized in that, it includes: A turning roller, which is arranged between the upstream conveying device and the downstream conveying device, and is configured to rotate from the upstream conveying device to the downstream conveying device, and is used to turn the tobacco leaves from the upstream conveying device and convey them to the downstream conveying device. There are multiple rows of rake nails on it, and the multiple rows of rake nails are evenly distributed along the circumferential direction of the turning roller; A guide plate, which is fixedly arranged between the upstream conveying device and the downstream conveying device, and is configured in a comb-like shape adapted to the rake nails, and its cross-section is a gradually changing curve that gradually changes from the upstream conveying device to the downstream conveying device. When turning, the length of the protruding rake nails gradually becomes smaller, and the tobacco leaves move along the outside of the guide plate and fall on the downstream conveying device.

2. The tobacco leaf material turning device according to claim 1, characterized in that, The guide plate includes: A horizontal part, which is arranged at one end close to the upstream conveying device and is used to receive the tobacco leaves from the upstream conveying device.

3. The tobacco leaf material turning device according to claim 2, characterized in that, The guide plate further includes: A gradually changing part, which gradually extends from the end of the horizontal part along the roller surface of the turning roller to the downstream conveying device.

4. The tobacco leaf material turning device according to claim 3, characterized in that, The gradually changing part includes: An arc section, which extends from the end of the horizontal part to the highest point of the turning roller; An extension section, which extends from the end of the arc section to the downstream conveying device, and the distance between it and the roller surface of the turning roller gradually increases.

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