Tobacco leaf screening screen with adjustable aperture

Abstract

The utility model belongs to the technical field of tobacco shred making, and discloses an aperture-adjustable tobacco screening screen which comprises a mounting frame, a cross connecting rod mechanism and a position adjusting assembly. The mounting frame comprises a first support, a second support and a third support, the first sliding block can slide in the first sliding groove in the Y direction, the second sliding block can slide in the second sliding groove in the X direction, and the third sliding block can slide in the third sliding groove in the X direction and the Y direction; end points of the left side, the rear side and the right side of the cross connecting rod mechanism are hinged to the first sliding block, the second sliding block and the third sliding block at the corresponding positions respectively, and a plurality of rhombic screening through holes are formed in the cross connecting rod mechanism. The position adjusting assembly is arranged on the side, away from the first support, of the third support and can adjust the third sliding block to slide in the third sliding groove in the X direction. By means of the screen, a user can adjust the aperture size according to conditions, tobacco materials are saved under the condition that the processing technology requirements are met, and cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of tobacco leaf shred processing, in particular to a tobacco leaf screening screen with adjustable aperture. Background Art

[0002] The tobacco leaf shred process mainly consists of loosening and moisture recovery, adding materials, shredding, drying, and flavoring. During these processes, it is inevitable that the tobacco material will be broken into pieces, and fragments, ashes, and cigarette dust with a diameter of less than 1.5 mm will appear. In order to reduce the breakage rate of finished tobacco shreds and make the cigarettes have a better filling value, these fragments, ashes, cigarette dust and other fine particles need to be screened out during the tobacco leaf shred process. The screening process is achieved using a double-layer vibrating screen. The double-layer vibrating screen has a two-layer structure. The surface that is in direct contact with the tobacco material is a perforated mesh plate with a certain aperture, and the lower layer is an ordinary steel plate. When the double-layer vibrating screen is working, the material is transported to the double-layer vibrating screen after a certain processing by the upstream equipment, and moves forward evenly at a certain frequency with the double-layer vibrating screen. During the movement, due to the dual effects of the forward conveying action and the perforated mesh plate, the fragments, ashes, cigarette dust and other fine particles in the tobacco material pass through the perforated mesh plate and fall directly onto the bottom ordinary steel plate. As the vibrating screen moves forward, it is finally transported to the dust removal room for centralized dust removal by the ventilation dust removal pipe at the end of the bottom layer of the double-layer vibrating screen; while the tobacco material with a larger diameter is transported to the next process through the upper layer of the double-layer vibrating screen.

[0003] The requirements for the first-class tobacco are more stringent, that is, more fragments, ash, and tobacco dust need to be screened out. Therefore, the fixed-aperture perforated screen is designed to have a larger aperture. This results in the screening out of larger diameter fragments that do not need to be screened out when producing second-class and third-class tobacco with lower requirements for crushing rate and dust content, resulting in a waste of tobacco materials. At present, the perforated screen is manually replaced with a smaller aperture, but this process is time-consuming and labor-intensive, and the tobacco workshop produces many brands of tobacco, so it is difficult to solve the problem by replacing the perforated screen once for each brand. Utility Model Content

[0004] The utility model aims to provide a tobacco screening screen with adjustable aperture to solve the problems raised in the above-mentioned background technology.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A tobacco leaf screening screen with adjustable aperture, comprising:

[0007] The mounting frame comprises a first bracket, a second bracket and a third bracket, the two ends of the second bracket are respectively connected to the ends of the first bracket and the third bracket, a first slide groove is provided on a side of the first bracket close to the third bracket, a plurality of first sliders are arranged in the first slide groove, and the first slider can slide along the Y direction in the first slide groove; a second slide groove is provided on a side of the second bracket close to the first bracket, a plurality of second sliders are arranged in the second slide groove, and the second slider can slide along the X direction in the second slide groove; a third slide groove is provided on a side of the third bracket close to the first bracket, a plurality of third sliders are arranged in the third slide groove, and the third slider can slide along the X direction and the Y direction in the third slide groove;

[0008] A cross-link mechanism, wherein each end point on the left side of the cross-link mechanism is respectively hinged to the first slider at a corresponding position, each end point on the rear side of the cross-link mechanism is respectively hinged to the second slider at a corresponding position, each end point on the right side of the cross-link mechanism is respectively hinged to the third slider at a corresponding position, and the cross-link mechanism is provided with a plurality of rhombus-shaped screening through holes;

[0009] A position adjustment component is disposed on a side of the third bracket away from the first bracket, and the position adjustment component can adjust the third slider to slide in the third sliding groove along the X direction.

[0010] Optionally, the cross-link mechanism comprises:

[0011] A plurality of first connecting rods are arranged at intervals, and the plurality of first connecting rods are parallel to each other;

[0012] A plurality of second connecting rods are arranged at intervals, the plurality of second connecting rods are parallel to each other, and the second connecting rods are arranged crosswise with the first connecting rods, the first connecting rods and the second connecting rods are hinged at the crossing and overlapping position, and the diamond-shaped screening through holes are formed between two adjacent first connecting rods and two adjacent second connecting rods.

[0013] Optionally, the first connecting rod is provided with a first connecting hole, and the second connecting rod is provided with a second connecting hole. The first connecting hole and the second connecting hole are both located at positions where the first connecting rod and the second connecting rod intersect and overlap. A pin shaft passes through the first connecting hole and the second connecting hole, and the first connecting hole and the second connecting hole are both rotatably connected to the pin shaft.

[0014] Optionally, the position adjustment component includes:

[0015] An adjusting bolt, the adjusting bolt being rotatably connected to an end of the second bracket close to the third bracket;

[0016] A connecting frame, wherein the connecting frame is provided with a threaded hole, and the threaded hole is threadedly connected to the adjusting bolt. A fourth sliding groove is provided on a side of the connecting frame close to the third bracket, and a plurality of fourth sliding blocks aligned with the third sliding blocks are arranged in the fourth sliding groove. The fourth sliding blocks can slide along the Y direction in the fourth sliding groove, and a connecting rod is fixedly provided on one end of the fourth sliding block close to the third sliding block, and the connecting rod is fixedly connected to the third sliding block.

[0017] Optionally, the position adjustment assembly further includes a spring, one end of the spring is connected to the connecting frame, and the other end of the spring is connected to the third bracket.

[0018] Optionally, a first connecting protrusion is provided on a side of the third bracket close to the connecting frame, and one end of the spring is sleeved on the first connecting protrusion;

[0019] A second connecting protrusion aligned with the first connecting protrusion is arranged on one side of the connecting frame close to the third bracket, and the other end of the spring is sleeved on the second connecting protrusion.

[0020] Optionally, the adjusting bolt is threadedly connected with a locking nut, and the locking nut abuts against the connecting frame.

[0021] Optionally, the first bracket is parallel to the third bracket, and the second bracket is perpendicular to the first bracket and the third bracket.

[0022] Beneficial effects of the utility model:

[0023] The utility model provides a tobacco screening screen with adjustable aperture. When the aperture of the diamond screening through hole needs to be adjusted, the third slider is adjusted by the position adjustment component to slide in the third slide groove along the X direction, and the third slider slides close to the first slider. The third slider drives the end point on the right side of the cross-link mechanism to move toward the end point on the right side of the cross-link mechanism, so that the distance between the left and right sides of the cross-link assembly becomes smaller, and at the same time, the distance between the end point on the front side of the cross-link assembly and the end point on the rear side of the cross-link assembly becomes larger, so that the diamond screening through hole is gradually reduced to the required aperture. By using the tobacco screening screen with adjustable aperture, the user can freely adjust the aperture size according to the situation, save tobacco materials and reduce costs while meeting the processing requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying creative work.

[0025] Figure 1 It is a schematic diagram of the structure of the tobacco screening screen with adjustable aperture provided by the utility model;

[0026] Figure 2 It is a structural schematic diagram of the cross-link mechanism in the utility model;

[0027] Figure 3 It is an exploded view of the cross-link mechanism in the utility model.

[0028] In the figure:

[0029] 100, mounting frame; 110, first bracket; 111, first slide groove; 112, first slider; 120, second bracket; 121, second slide groove; 122, second slider; 130, third bracket; 131, third slide groove; 132, third slider; 133, first connecting protrusion; 200, cross-link mechanism; 210, diamond screening through hole; 220, first connecting rod; 221, first connecting hole; 230, second connecting rod; 231, second connecting hole; 240, pin; 300, position adjustment assembly; 310, adjustment bolt; 311, locking nut; 320, connecting frame; 321, fourth slide groove; 322, connecting rod; 323, second connecting protrusion; 330, spring. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0031] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0034] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0035] like Figures 1 to 3As shown, the utility model provides a tobacco screening screen with adjustable aperture, including a mounting frame 100, a cross-link mechanism 200 and a position adjustment assembly 300. The mounting frame 100 includes a first bracket 110, a second bracket 120 and a third bracket 130, the two ends of the second bracket 120 are respectively connected to the ends of the first bracket 110 and the third bracket 130, a first slide groove 111 is provided on the side of the first bracket 110 close to the third bracket 130, a plurality of first sliders 112 are arranged in the first slide groove 111, and the first slider 112 can slide along the Y direction in the first slide groove 111; a second slide groove 121 is provided on the side of the second bracket 120 close to the first bracket 110, a plurality of second sliders 122 are arranged in the second slide groove 121, and the second slider 122 can slide along the X direction in the second slide groove 121; a third slide groove 131 is provided on the side of the third bracket 130 close to the first bracket 110 , a plurality of third sliders 132 are arranged in the third slide groove 131, and the third sliders 132 can slide in the third slide groove 131 along the X direction and the Y direction; each end point on the left side of the cross-link mechanism 200 is respectively hinged to a first slider 112 at a corresponding position, each end point on the rear side of the cross-link mechanism 200 is respectively hinged to a second slider 122 at a corresponding position, and each end point on the right side of the cross-link mechanism 200 is respectively hinged to a third slider 132 at a corresponding position, and a plurality of diamond-shaped screening through holes 210 are arranged on the cross-link mechanism 200; the position adjustment component 300 is arranged on the side of the third bracket 130 away from the first bracket 110, and the position adjustment component 300 can adjust the third slider 132 to slide in the third slide groove 131 along the X direction. Specifically, the first bracket 110 is parallel to the third bracket 130, and the second bracket 120 is perpendicular to the first bracket 110 and the third bracket 130.

[0036] The utility model provides a tobacco screening screen with adjustable aperture. When the aperture of the rhombus screening through hole 210 needs to be adjusted, the third slider 132 is adjusted to slide in the third slide groove 131 along the X direction through the position adjustment component. The third slider 132 slides close to the first slider 112. The third slider 132 drives the end point on the right side of the cross-link mechanism 200 to move close to the end point on the right side of the cross-link mechanism 200, so that the distance between the left and right sides of the cross-link assembly becomes smaller, and at the same time, the distance between the end point on the front side of the cross-link assembly and the end point on the rear side of the cross-link assembly becomes larger, so that the rhombus screening through hole 210 is gradually reduced to the required aperture. By using the tobacco screening screen with adjustable aperture, the user can freely adjust the aperture size according to the situation, save tobacco materials and reduce costs while meeting the processing requirements.

[0037] In some embodiments, the cross-link mechanism 200 includes a plurality of first links 220 and a plurality of second links 230 arranged at intervals; the plurality of first links 220 are parallel to each other; the plurality of second links 230 are parallel to each other, and the second links 230 are arranged crosswise with the first links 220, the first links 220 and the second links 230 are hinged at the cross-over position, and a diamond-shaped screening through hole 210 is formed between two adjacent first links 220 and two adjacent second links 230. By adjusting the distance between the third slider 132 and the first slider 112, the angle formed by the hinge of the first link 220 and the second link 230 at the cross-over position can be adjusted, thereby changing the long diagonal length and the short diagonal length of the diamond-shaped screening through hole 210, and then changing the hole area of ​​the diamond-shaped screening through hole 210, so as to achieve the purpose of changing the aperture of the diamond-shaped screening through hole 210.

[0038] Specifically, the first connecting rod 220 is provided with a first connecting hole 221, and the second connecting rod 230 is provided with a second connecting hole 231. The first connecting hole 221 and the second connecting hole 231 are both located at the position where the first connecting rod 220 and the second connecting rod 230 intersect and overlap. The pin shaft 240 passes through the first connecting hole 221 and the second connecting hole 231. The first connecting hole 221 and the second connecting hole 231 are both rotatably connected to the pin shaft 240, thereby realizing the hinge connection between the first connecting rod 220 and the second connecting rod 230.

[0039] In some embodiments, the position adjustment assembly 300 includes an adjustment bolt 310 and a connecting frame 320; the adjustment bolt 310 is rotatably connected to one end of the second bracket 120 near the third bracket 130; the connecting frame 320 is provided with a threaded hole, the threaded hole is threadedly connected to the adjustment bolt 310, and a fourth slide groove 321 is provided on one side of the connecting frame 320 near the third bracket 130, and a plurality of fourth sliders aligned with the third slider 132 are arranged in the fourth slide groove 321, and the fourth slider can slide along the Y direction in the fourth slide groove 321, and a connecting rod 322 is fixedly arranged at one end of the fourth slider near the third slider 132, and the connecting rod 322 is fixedly connected to the third slider 132. By rotating the adjustment bolt 310, the adjustment bolt 310 drives the connecting frame 320 to move relative to the third bracket 130, so that the fourth slider drives the third slider 132 to slide in the third slide groove 131 along the X direction through the connecting rod 322. Specifically, the adjustment bolt 310 is extended along the X direction.

[0040] Optionally, the position adjustment assembly 300 further includes a spring 330, one end of which is connected to the connecting frame 320, and the other end of which is connected to the third bracket 130, and the spring 330 can support the connecting frame 320. Specifically, a first connecting protrusion 133 is provided on one side of the third bracket 130 close to the connecting frame 320, and one end of the spring 330 is sleeved on the first connecting protrusion 133; a second connecting protrusion 323 aligned with the first connecting protrusion 133 is provided on one side of the connecting frame 320 close to the third bracket 130, and the other end of the spring 330 is sleeved on the second connecting protrusion 323. By providing the first connecting protrusion 133 and the second connecting protrusion 323, it is convenient to disassemble and assemble the spring 330, and the spring 330 can be limited in the Y direction to prevent the spring 330 from deflecting.

[0041] In some preferred embodiments, the adjusting bolt 310 is threadedly connected with a locking nut 311, and the locking nut 311 abuts against the connecting frame 320. By setting the locking nut 311, after the distance between the connecting frame 320 and the third bracket 130 is adjusted, the locking nut 311 is tightened to lock the position of the connecting frame 320.

[0042] The mounting frame 100 is manufactured in parts, and the first bracket 110, the second bracket 120 and the third bracket 130 are connected by bolts. The groove depth of the first slide groove 111 and the second slide groove 121 is 3 mm, and the thickness of the first slider 112 and the second slider 122 is 3 mm; the groove depth of the third slide groove 131 is 6 mm, and the thickness of the third slider 132 is 3 mm. The third slider 132 can move in two degrees of freedom in the third slide groove 131, and can move 3 mm in the X direction. By rotating the adjusting bolt 310 clockwise or counterclockwise, the distance between the third bracket 130 and the connecting frame 320 can be changed, thereby driving the third slider 132 to move, and then changing the aperture size of the diamond screening through hole 210 under the action of the hinge in the cross-link mechanism 200; the connecting frame 320 plays the role of connecting the ends of multiple third sliders 132, ensuring that the displacement of the degree of freedom in the X direction obtained by each third slider 132 after adjusting the adjusting bolt 310 is consistent; the left end of the spring 330 acts on the third bracket 130, and the right end of the spring 330 acts on the connecting frame 320, ensuring that the displacement of the third slider 132 in the X direction is 0mm when the spring 330 is at its original length. When the adjusting bolt 310 is rotated, the distance between the third bracket 130 and the connecting frame 320 is reduced, and the spring 330 is compressed, otherwise the spring 330 returns to its original length; the third slider 132 plays the role of transmitting the displacement of the spring 330 or the adjusting bolt 310 acting on the connecting frame 320 to the cross-link mechanism 200. The cross-link mechanism 200 is hingedly connected by multiple first links 220 and second links 230 of different lengths. The smallest length of the first link 220 and the second link 230 is 2 mm. The lengths of the multiple first links 220 increase in multiples of 1, 3, 5, 7..., and the lengths of the multiple second links 230 increase in multiples of 1, 3, 5, 7... Under the action of the mounting frame 100, the left and rear ends of the cross-link mechanism 200 are restricted, and only the front and right ends can be displaced. The right end of the cross-link mechanism 200 realizes displacement in the X direction and the Y direction through the third slider 132, and the diamond-shaped screening through hole 210 formed between the two adjacent first links 220 and the two adjacent second links 230 changes, and the aperture of the diamond-shaped screening through hole 210 also changes, wherein the maximum area of ​​the diamond-shaped screening through hole 210 is 2×2=4 square millimeters, and the minimum area of ​​the diamond-shaped screening through hole 210 is 0 square millimeters. The maximum displacement of the third slider 132 in the X direction is 3 mm, and the diagonal length of the diamond-shaped screening through hole 210 when it is a square is 2 times the square root of 2 mm. The maximum displacement of the third slider 132 in the X direction is greater than the diagonal length of the diamond-shaped screening through hole 210 when it is a square, so the area of ​​the diamond-shaped screening through hole 210 can be adjusted in the range of 0 square millimeters to 4 square millimeters.

[0043] When processing a type of cigarette, that is, when the required screening aperture is larger, the locking nut 311 is loosened, and the adjusting bolt 310 is rotated to adjust the distance between the connecting frame 320 and the third bracket 130 until the spring 330 is in the original length state, and then the locking nut 311 is tightened. The contact surface of one end of the spring 330 is located on the third bracket 130, and the contact surface of the other end of the spring 330 is located on the connecting frame 320. The spring 330 can play a role in supporting the connecting frame 320, which is reflected on the third slider 132 as contact with the bottom of the third slide groove 131. At this time, the diamond screen The through hole 210 is in the state of maximum aperture; when processing Class II and Class III cigarettes, that is, when the required screening aperture is smaller, loosen the locking nut 311, rotate the adjusting bolt 310 to reduce the distance between the connecting frame 320 and the third bracket 130, and then tighten the locking nut 311, the spring 330 is compressed, and the third slider 132 moves under the action of the connecting rod 322, the distance between the third slider 132 and the first slider 112 is reduced, and the first connecting rod 220 and the second connecting rod 230 rotate around the pin 240, and finally the aperture of the diamond-shaped screening through hole 210 is reduced.

[0044] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A tobacco screening screen with adjustable aperture, characterized in that: include: The mounting frame comprises a first bracket, a second bracket and a third bracket, the two ends of the second bracket are respectively connected to the ends of the first bracket and the third bracket, a first slide groove is provided on a side of the first bracket close to the third bracket, a plurality of first sliders are arranged in the first slide groove, and the first slider can slide along the Y direction in the first slide groove; a second slide groove is provided on a side of the second bracket close to the first bracket, a plurality of second sliders are arranged in the second slide groove, and the second slider can slide along the X direction in the second slide groove; a third slide groove is provided on a side of the third bracket close to the first bracket, a plurality of third sliders are arranged in the third slide groove, and the third slider can slide along the X direction and the Y direction in the third slide groove; A cross-link mechanism, wherein each end point on the left side of the cross-link mechanism is respectively hinged to the first slider at a corresponding position, each end point on the rear side of the cross-link mechanism is respectively hinged to the second slider at a corresponding position, each end point on the right side of the cross-link mechanism is respectively hinged to the third slider at a corresponding position, and the cross-link mechanism is provided with a plurality of rhombus-shaped screening through holes; A position adjustment component is disposed on a side of the third bracket away from the first bracket, and the position adjustment component can adjust the third slider to slide in the third sliding groove along the X direction.

2. The tobacco screening screen with adjustable aperture according to claim 1, characterized in that: The cross-link mechanism comprises: A plurality of first connecting rods are arranged at intervals, and the plurality of first connecting rods are parallel to each other; A plurality of second connecting rods are arranged at intervals, the plurality of second connecting rods are parallel to each other, and the second connecting rods are arranged crosswise with the first connecting rods, the first connecting rods and the second connecting rods are hinged at the crossing and overlapping position, and the diamond-shaped screening through holes are formed between two adjacent first connecting rods and two adjacent second connecting rods.

3. The tobacco screening screen with adjustable aperture according to claim 2, characterized in that: The first connecting rod is provided with a first connecting hole, and the second connecting rod is provided with a second connecting hole. The first connecting hole and the second connecting hole are both located at the position where the first connecting rod and the second connecting rod cross and overlap. The pin shaft passes through the first connecting hole and the second connecting hole, and the first connecting hole and the second connecting hole are both rotatably connected to the pin shaft.

4. The tobacco screening screen with adjustable aperture according to claim 1, characterized in that: The position adjustment component comprises: An adjusting bolt, the adjusting bolt being rotatably connected to an end of the second bracket close to the third bracket; A connecting frame, wherein the connecting frame is provided with a threaded hole, and the threaded hole is threadedly connected to the adjusting bolt. A fourth sliding groove is provided on a side of the connecting frame close to the third bracket, and a plurality of fourth sliding blocks aligned with the third sliding blocks are arranged in the fourth sliding groove. The fourth sliding blocks can slide along the Y direction in the fourth sliding groove, and a connecting rod is fixedly provided on one end of the fourth sliding block close to the third sliding block, and the connecting rod is fixedly connected to the third sliding block.

5. The tobacco screening screen with adjustable aperture according to claim 4, characterized in that: The position adjustment component also includes a spring, one end of the spring is connected to the connecting frame, and the other end of the spring is connected to the third bracket.

6. The tobacco screening screen with adjustable aperture according to claim 5, characterized in that: A first connecting protrusion is provided on one side of the third bracket close to the connecting frame, and one end of the spring is sleeved on the first connecting protrusion; A second connecting protrusion aligned with the first connecting protrusion is arranged on one side of the connecting frame close to the third bracket, and the other end of the spring is sleeved on the second connecting protrusion.

7. The tobacco screening screen with adjustable aperture according to claim 4, characterized in that: The adjusting bolt is threadably connected with a locking nut, and the locking nut abuts against the connecting frame.

8. The tobacco screening screen with adjustable aperture according to claim 1, characterized in that: The first bracket is parallel to the third bracket, and the second bracket is perpendicular to the first bracket and the third bracket.

Images