Stem strip screening device

Abstract

The utility model discloses a stem strip screening device which comprises a dredging assembly and a plurality of stages of vibrating screening units connected end to end, each vibrating screening unit comprises a screening plate on the upper layer and a bottom plate on the lower layer, strip-shaped holes are formed in the screening plate in the length direction of the screening plate, and a plurality of strip-shaped holes are formed in the width direction of the screening plate. The sieve plate is of a comb-tooth-shaped structure; the width of the strip-shaped holes of the upper-stage vibration screening unit is larger than that of the strip-shaped holes of the lower-stage vibration screening unit. The dredging assembly is configured to move along the strip-shaped hole and used for dredging the strip-shaped hole. According to the stem strip screening device, screening of stem strips with different thicknesses is achieved through the strip-shaped holes with different widths, meanwhile, the screening plate is dredged through the circulating dredging assembly, and the screening surface can be effectively prevented from being blocked.

Description

Technical Field

[0001] This utility model relates to the field of stem screening technology, and specifically to a stem screening device. Background Technology

[0002] In the production of tobacco shreds, a certain amount of stems needs to be mixed in to reduce the tar content of cigarettes and improve their combustion performance. Before mixing, the incoming stems need to be screened to remove overly thick, thin, or misshapen stems, in order to achieve homogenization in the production of stem shreds.

[0003] CN219850655U discloses a multi-stage tobacco stem screening device that uses multi-stage vibrating screening to screen tobacco stems of different lengths (long stems, short stems, and broken stems). However, this device is not suitable for screening stems of different thicknesses and is prone to clogging.

[0004] Therefore, a device is needed to screen stems of different thicknesses. Utility Model Content

[0005] To address the aforementioned problems, this utility model provides a stem screening device that uses strip holes of different widths to screen stems of different thicknesses, thereby achieving homogenization in stem production.

[0006] Specifically, this utility model provides a stalk screening device, including: a multi-stage vibrating screening unit connected end to end, each vibrating screening unit including an upper screen plate and a lower bottom plate, the screen plate is provided with strip-shaped holes arranged along the length direction of the screen plate, and multiple strip-shaped holes are arranged along the width direction of the screen plate, so that the screen plate has a comb-like structure.

[0007] The width of the slot in the upper-level vibrating screen unit is greater than the width of the slot in the lower-level vibrating screen unit;

[0008] The stalk screening device further includes:

[0009] A dredging component configured to move along a strip-shaped hole for unblocking the strip-shaped hole.

[0010] Furthermore, the unblocking component includes: at least one unblocking claw assembly configured to move along the length direction of the strip hole;

[0011] The unblocking claw assembly is a comb-like structure composed of several unblocking claws that is adapted to the sieve plate. When in use, the unblocking claws extend into the strip-shaped holes.

[0012] Furthermore, both sides of the vibrating screening unit are provided with conveyor sprockets and chains, and the unblocking claw assembly is connected to the conveyor sprockets and chains via connecting rods.

[0013] Furthermore, the unclogging claw is sleeved on the connecting rod, and a buffer layer is provided between it and the connecting rod. The unclogging claw is axially fixed on the connecting rod by the mounting sleeve.

[0014] Furthermore, the connecting rod has waist holes at both ends.

[0015] Furthermore, the unblocking claw is inclined along the direction of the bar conveying and forms an angle α with the plane of the sieve plate.

[0016] Furthermore, the outlet end of the sieve plate is provided with a discharge chute.

[0017] Working principle:

[0018] After the stems enter the screen plate of the first-stage vibrating screening unit, they are conveyed forward by vibration. During this conveying process, coarse stems and stem stalks are continuously conveyed forward and eventually fall into the discharge chute for collection. Finer and medium-sized stems fall through the strip-shaped holes onto the lower bottom plate and move towards the screen plate of the next-stage vibrating screening unit for screening. During screening, medium-sized stems are conveyed forward along the screen plate, while finer stems fall to the bottom of the lower layer for further conveying. The two-stage vibrating screening unit can achieve the screening of stem stalks, as well as coarse, medium, and fine stems.

[0019] During the screening process, the conveyor sprocket chain drives the unblocking claw assembly to make a circular motion. When it moves to the low position, it extends into the strip hole and moves along the strip hole. The individual unblocking claw 35 is tilted along the direction of the strip conveying, which makes it easier for the unblocking claw 35 to hook out the strip stuck in the strip hole, thereby avoiding screen blockage.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] (1) The stalk screening device provided by this utility model can screen stalks of different thicknesses by using strip holes of different widths, and at the same time use a circulating unblocking component to unblock the screen plate, which can effectively prevent the screen surface from clogging.

[0022] (2) The unblocking claw is installed on the connecting rod through the mounting sleeve, which can realize the adjustment of the lateral position (left and right) of the single unblocking claw to avoid it rubbing against the screen plate, causing excessive resistance to the operation of the screen unblocking device. At the same time, a single unblocking claw can be replaced individually if it is damaged, instead of replacing the whole device, thus reducing maintenance costs.

[0023] (3) A buffer layer is provided between the unclogging claw and the mounting sleeve, which can buffer the resistance when the unclogging claw is running and play a role in protecting the equipment.

[0024] (4) Waist holes are provided at the chain installation location to facilitate installation and adjustment and prevent damage caused by non-coplanar operation of the chain. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the stalk screening device in Example 1;

[0026] Figure 2 This is a schematic diagram of the internal structure of the stem screening device in Example 1;

[0027] Figure 3 This is a schematic diagram of the unclogging claw assembly in Example 1;

[0028] Figure 4 This is a half-sectional view of the unclogging claw assembly in Example 1;

[0029] Figure 5 This is a schematic diagram of the stalk screening device in Example 1;

[0030] Figure 6 This is a schematic diagram of the unclogging claw extending into the strip hole in Example 1.

[0031] Figure label:

[0032] 1- Primary vibrating screening unit; 11- Primary screen plate; 12- Primary base plate; 13- Discharge chute; 2- Secondary vibrating screening unit; 21- Secondary screen plate; 22- Secondary base plate; 3- Unblocking assembly; 31- Conveyor sprocket and chain; 32- Unblocking claw assembly; 33- Connecting rod; 34- Mounting sleeve; 35- Unblocking claw; 36- Rubber sleeve; 37- Waist hole. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0034] Example 1

[0035] like Figure 1-2 As shown, this embodiment provides a stalk screening device, including: a primary vibrating screening unit 1 and a secondary vibrating screening unit 2. The primary vibrating screening unit 1 and the secondary vibrating screening unit 2 adopt the vibration conveying method of a conventional vibrating conveyor, that is, the eccentric wheel is driven to rotate by a motor, which in turn drives the upper conveying component to swing, thereby realizing the throwing of materials. The specific structure is not described in detail here.

[0036] The conveying components of the primary vibrating screening unit 1 include an upper primary screen plate 11 and a lower primary base plate 12. Similarly, the secondary vibrating screening unit 2 includes an upper secondary screen plate 21 and a lower secondary base plate 22. The discharge end of the primary screen plate 11 is provided with a discharge trough 13 for collecting coarse stalks and stalk bends. The discharge end of the primary base plate 12 is connected to the feed end of the secondary screen plate 21. Both the primary screen plate 11 and the secondary screen plate 21 are provided with several strip-shaped holes, which are arranged along the width direction of the screen plate and along the length direction of the screen plate, so that the screen plate forms a comb-like structure. The width of the slotted holes in the primary sieve plate 11 is larger than that in the secondary sieve plate 21. The primary sieve plate 11 is used to separate the medium and fine stems from the coarse and stem bends. The coarse and stem bends are conveyed forward on the primary sieve plate 11, while the medium and fine stems fall onto the primary bottom plate 12 and are finally conveyed into the secondary sieve plate 21. The secondary sieve plate 21 then performs the screening, with the medium stems being conveyed forward on the secondary sieve plate 21 and the fine stems falling onto the secondary bottom plate 22. This achieves the screening of stem bends and coarse, medium, and fine stems.

[0037] Above the primary vibrating screening unit 1 and the secondary vibrating screening unit 2, a clearing assembly 3 is provided. As shown in the figure, the clearing assembly 3 includes: two sets of conveyor sprocket chains 31 and three clearing claw assemblies 32. The two sets of conveyor sprocket chains 31 are located on both sides of the vibrating screening unit and are driven by a motor. The clearing claw assemblies 32 are connected to the two sets of conveyor sprocket chains 31 through connecting rods 33. That is, both ends of the connecting rods 33 are connected to the chains of the two sets of conveyor sprocket chains 31 respectively. Waist holes 37 are provided at both ends of the connecting rods 33 to facilitate the installation and adjustment of the connecting rods 33 and prevent damage caused by non-coplanar operation of the chains.

[0038] like Figure 3-6 As shown, the unblocking claw assembly 32 consists of several unblocking claws 35. These claws 35 together form a comb-like structure adapted to the sieve plate. The unblocking claws 35 are positioned opposite the strip-shaped holes, allowing them to extend into and move along the strip-shaped holes during low-position movement. Preferably, as shown... Figure 6 As shown, the unblocking claw 35 is inclined along the direction of the bar conveying and forms an angle α with the plane of the screen plate, which facilitates the hooking of the bar blocked in the bar holes and reduces the resistance during operation.

[0039] Specifically, the connecting rod 33 is square, and a single unclogging claw 35 is axially fixed to the connecting rod 33 by two mounting sleeves 34. The mounting sleeves 34 are fixed to the connecting rod 33 by bolts (the bolts abut against the connecting rod 33), so that the two mounting sleeves 34 hold one unclogging claw 35. By loosening the bolts of the mounting sleeves 34, the left and right positions of the unclogging claw 35 can be adjusted, which can realize the adjustment of the lateral position of the unclogging claw 35 and avoid it from rubbing against the screen plate. At the same time, a damaged unclogging claw can be replaced individually. The unclogging claw 35 is sleeved on the connecting rod 33, and a rubber sleeve 36 is set between the two. The elasticity of the rubber sleeve 36 is used to buffer the resistance of the unclogging claw 35 during operation, which plays a role in protecting the equipment.

[0040] The above-described specific examples are for illustrative purposes only and are not intended to limit the scope of this invention. Those skilled in the art to which this invention pertains can make various simple deductions, modifications, or substitutions based on the concept of this invention.

Claims

1. A stem screening device, comprising: A multi-stage vibrating screening unit connected end to end, each vibrating screening unit includes an upper screen plate and a lower bottom plate, characterized in that the screen plate is provided with strip-shaped holes arranged along the length direction of the screen plate, and multiple strip-shaped holes are arranged along the width direction of the screen plate, so that the screen plate has a comb-like structure. The width of the slot in the upper-level vibrating screen unit is greater than the width of the slot in the lower-level vibrating screen unit; The stalk screening device further includes: The unblocking component (3) is configured to move along the strip hole for unblocking the strip hole.

2. The stem screening device as described in claim 1, characterized in that, The unblocking component (3) includes: at least one unblocking claw assembly (32), the unblocking claw assembly (32) being configured to move along the length direction of the strip hole; The unblocking claw assembly (32) is a comb-shaped structure adapted to the sieve plate, consisting of several unblocking claws (35). When in use, the unblocking claws (35) extend into the strip-shaped holes.

3. The stem screening device as described in claim 2, characterized in that, Both sides of the vibrating screening unit are provided with conveyor sprocket chains (31), and the unblocking claw group (32) is connected to the chain of the conveyor sprocket chain (31) through the connecting rod (33).

4. The stem screening device as described in claim 3, characterized in that, The unclogging claw (35) is sleeved on the connecting rod (33), and a buffer layer is provided between it and the connecting rod (33). The unclogging claw (35) is axially fixed on the connecting rod (33) by the mounting sleeve (34).

5. The stem screening device as described in claim 3 or 4, characterized in that, The connecting rod (33) has waist holes (37) at both ends.

6. The stem screening device as described in claim 2, characterized in that, The unblocking claw (35) is inclined along the direction of the stalk conveying.

7. The stem screening device as described in claim 1, characterized in that, The sieve plate is provided with a discharge chute (13) at the outlet end.

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