Discharging slideway design method for cigarettes
By designing curve constraint equations on the cigarette stand discharge slide, the problems of cigarette stand discharge and fly-off slide are solved, and the accuracy and production quality of automatic discharge are improved.
Patent Information
- Application Number
- CN202411802631.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-09
- Publication Date
- 2025-03-18
AI Technical Summary
The existing smoke stick cutter design is mainly based on experience, which can easily lead to problems such as tobacco stick material and fly away from the slide, affecting the automation process of production inspection and the physical properties of the smoke stick.
By establishing the point coordinate constraint equation and the curvature radius constraint equation of the discharge slide curve, the slide curve is designed to ensure that the cigarette support does not separate from the slide before contacting the vertical baffle, and avoid flying off the slide in advance.
It improves the accuracy of automatic discharge control of cigarette sticks, reduces the damage rate of cigarette sticks, and improves the production quality of cigarette sticks.
Smart Images
Figure CN119646945A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of a cigarette unloading chute, and more specifically, to a design method for a cigarette unloading chute. Background Art
[0002] The slide is a common and economical way of loading and unloading in production and testing. It mainly facilitates the material's own gravity to complete the automatic loading of the next process or link. At present, a common convex curve slide is used to transform the strip material from a horizontal posture to a vertical posture. The slide consists of a convex curve slide and a vertical baffle. The material slides down the slide from the rightmost end of the slide until it touches the vertical baffle. The vertical wall ensures that the material can enter the next link in a vertical posture, thereby realizing the transformation of the material from a horizontal posture to a vertical posture.
[0003] The current cigarette unloading chutes are mainly designed based on experience, which often leads to the phenomenon that cigarettes may get stuck or fly off the chute prematurely when sliding on the chute. Among them, the jamming phenomenon will seriously affect the automation process of production inspection, and the flying material will cause the end of the cigarette to collide with the chute, thereby affecting the physical properties of the cigarette to varying degrees. The quality of tobacco products is very sensitive to changes in the physical indicators of cigarettes. When any link in the tobacco product changes, the cigarette indicators can be quickly reflected. If the cigarette flies off the chute prematurely, the tobacco segment will contact the chute, affecting the quality, thereby affecting the subsequent indicator detection and product traceability of the cigarette. Therefore, how to design the cigarette unloading chute curve to accurately control the unloading of cigarettes is of great significance. Summary of the invention
[0004] The present invention provides a method for designing a feeding chute for cigarettes, which solves the problem that the existing feeding chute design for cigarettes is mainly based on experience, which easily causes cigarettes to get stuck and fly off the chute. The method can increase the scientificity and theoretical nature of the design of the feeding chute for cigarettes, improve the accuracy of automatic feeding control of cigarettes, reduce the damage rate of cigarettes, and improve the production quality of cigarettes.
[0005] To achieve the above objectives, the present invention provides the following technical solutions:
[0006] A method for designing a cigarette unloading chute, comprising:
[0007] Get the length of the cigarette , cigarette width d, slide end width w and friction coefficient μ between cigarette and slide, and establish point coordinate constraint equation on the unloading slide curve with the constraint condition that cigarette does not touch the vertical baffle on the slide;
[0008] Determine the point coordinates of the material discharge chute curve according to the change of the inclination angle of the cigarette on the material discharge chute and the point coordinate constraint equation;
[0009] Obtain the starting point and end point of the slideway, establish a coordinate system with the end point of the slideway as the origin, and construct the curvature radius constraint equation of the unloading slideway curve;
[0010] The curvature radius of the discharge chute curve is determined according to the changes in the speed and curvature of the cigarettes on the discharge chute and the curvature radius constraint equation.
[0011] Preferably, it also includes:
[0012] According to the point coordinates and curvature radius of the unloading slideway curve, multiple arcs with different curvature radii are constructed so that the arc at the end of the previous arc is the arc at the beginning of the next arc.
[0013] Preferably, the coordinate point constraint equation is: ,in, is the inclination angle of the cigarette movement, It is the X-axis value of the coordinate of the point where the cigarette moves.
[0014] Preferably, the curvature radius constraint equation is: , where e is a mathematical constant, g is the acceleration due to gravity, is the initial velocity, R is the curvature radius of motion, is the arc angle at the beginning of the arc, is the arc end angle, is the change in radians.
[0015] Preferably, it also includes:
[0016] The radius of each arc should be assigned as follows:
[0017] The radius of each arc is at least greater than the minimum value R of the curvature radius of motion calculated by dynamic analysis. min ;
[0018] When the cigarette moves on the slide curve, it should be avoided that the cigarette comes into contact with the vertical baffle prematurely within the set low arc value.
[0019] Preferably, it also includes:
[0020] The initial arc β0 and the ending arc β1 of the unloading slide curve are used as boundaries, and the slide curve is divided into multiple arcs according to the arc. The initial arc β0 is greater than the static friction angle between the cigarette and the slide, and the ending arc β1 is less than 90 degrees.
[0021] Preferably, it also includes:
[0022] Get the actual curvature radius R of the cigarette and the curvature radius R of the slide M The relationship between the curvature radius of the slideway is obtained according to the relationship between the curvature radius of the slideway and the curvature radius of the slideway. The relationship between the curvature radius of the slideway and the curvature radius of the slideway is obtained according to the relationship between the curvature radius of the slideway and the curvature radius of the slideway. M +d / 2.
[0023] Preferably, it also includes:
[0024] The curvature of the material discharge chute curve increases as the cigarette slides down, and the curvature radius of the curve arc assigned to the front section of the material discharge chute curve is smaller than the curvature radius of the material discharge chute curve corresponding to the increase in the curvature of the rear section.
[0025] Preferably, it also includes:
[0026] The curve of the cigarette chute is a convex curve structure, so that the cigarette can be transformed from a horizontal posture to a vertical posture.
[0027] The present invention provides a method for designing a material discharge chute for cigarettes, which ensures that cigarettes are not separated from the chute before contacting a vertical baffle plate by designing a material discharge chute curve, thereby preventing cigarettes from flying off the chute in advance and colliding with the chute, thereby affecting the physical properties of the cigarettes. The method solves the problem that the existing cigarette material discharge chute design is mainly based on experience, which easily causes cigarettes to get stuck and fly off the chute, and can increase the scientificity and theoretical nature of the cigarette material discharge chute design, improve the accuracy of automatic cigarette discharge control, reduce the damage rate of cigarettes, and improve the production quality of cigarettes. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] In order to more clearly illustrate the specific embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below.
[0029] Figure 1 It is a schematic diagram of a method for designing a discharge chute for cigarettes provided by the present invention.
[0030] Figure 2 It is a schematic diagram of cigarette movement analysis provided by an embodiment of the present invention. DETAILED DESCRIPTION
[0031] In order to enable persons skilled in the art to better understand the solutions of the embodiments of the present invention, the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings and implementation modes.
[0032] In view of the problem that the current design of a cigarette feeding chute is mainly based on experience, which easily causes cigarettes to get stuck and fly off the chute, the present invention provides a design method for a cigarette feeding chute to solve the problem that the existing design of a cigarette feeding chute is mainly based on experience, which easily causes cigarettes to get stuck and fly off the chute. The method can increase the scientificity and theoretical nature of the design of the cigarette feeding chute, improve the accuracy of automatic cigarette feeding control, reduce the damage rate of cigarettes, and improve the production quality of cigarettes.
[0033] like Figure 1 As shown, a method for designing a cigarette feeding chute includes:
[0034] S1: Get the length of the cigarette , cigarette width d, slide end width w and friction coefficient μ between the cigarette and the slide, and establish the point coordinate constraint equation on the unloading slide curve with the constraint condition that the cigarette does not contact the vertical baffle on the slide.
[0035] S2: Determine the point coordinates of the material discharge chute curve according to the change in the inclination angle of the cigarette on the material discharge chute and the point coordinate constraint equation.
[0036] S3: Obtain the starting point and the end point of the slide, establish a coordinate system with the end point of the slide as the origin, and construct a curvature radius constraint equation of the blanking slide curve.
[0037] S4: Determine the curvature radius of the discharge chute curve according to the changes in the speed and curvature of the cigarettes on the discharge chute and the curvature radius constraint equation.
[0038] Specifically, the cigarette chute is a convex curve structure so that the cigarette can be transformed from a horizontal posture to a vertical posture. When the cigarette chute is a convex curve structure, the inclination angle α (the angle between the axis and the horizontal line) of the material is changed from 0 degrees to 90 degrees. Therefore, the smaller the inclination angle of the material before it contacts the wall, the more difficult it is to deflect the inclination angle of the material to 90 degrees, and it is more likely to get stuck. The reason why the material flies away in the chute is that the resultant force along the radial direction of the curve during the movement of the material is less than the centripetal force required by the material, causing the material to move centrifugally on the chute. And compared with the case where the material does not fly away from the chute, the inclination angle when it finally contacts the wall is also smaller, making it more likely to get stuck. Therefore, it is beneficial to keep the center of mass of the material in contact with the surface of the chute before contacting the vertical wall to avoid getting stuck and damage to the end. Therefore, this problem can be transformed into a dynamic problem: under what curve parameter conditions does the strip material not separate from the chute and complete the discharge.
[0039] The movement of the cigarette along the slide is as follows Figure 2 As shown in the figure, the basic parameters of the cigarette are: cigarette length l, cigarette width d. The friction coefficient between the cigarette and the slide The cigarette is ejected from the top of the slide at an initial speed Start to slide down, under the influence of gravity during the movement , slide support , dynamic friction force f. Assume that the angle between the material axis and the x-axis is the material inclination angle ϴ, and the channel width at the end of the slideway is The coordinates are established with the end point of the slide as the origin. The coordinates of the point on the unloading slide curve are (n=1,2,3…).
[0040] This method establishes the coordinate constraint equation and curvature radius constraint equation of the unloading chute curve so that the chute curve design can ensure that the material does not separate from the chute before contacting the vertical baffle, and avoids the material from flying off the chute in advance and colliding with it, thereby affecting the physical properties of the material. At the same time, compared with the chute designed by traditional experience, the posture of the material contacting the vertical baffle is closer to the vertical posture (the inclination angle of the material is closer to 90 degrees), which can promote the material to better realize the conversion from horizontal posture to vertical posture, and reduce the possibility of material jamming in the chute.
[0041] The method also includes: constructing multiple arcs with different curvature radii according to the point coordinates and curvature radius of the unloading slideway curve, so that the curvature of the end of the previous arc is the curvature of the beginning of the next arc.
[0042] Furthermore, the coordinate point constraint equation is: ,in, is the inclination angle of the cigarette movement, It is the X-axis value of the coordinate of the point where the cigarette moves.
[0043] Furthermore, the curvature radius constraint equation is: , where e is a mathematical constant, g is the acceleration due to gravity, is the initial velocity, R is the curvature radius of motion, is the arc angle at the beginning of the arc, is the arc end angle, is the change in radians.
[0044] Specifically, Newton's second law shows that the dynamic equation of the material on the circular slide is: , in the tangential direction: , in the normal direction: , for the tangential acceleration, , the normal acceleration is , while sliding friction .
[0045] Arranged: ,in ;
[0046] make , we have: ,
[0047] The above equation is a first-order nonhomogeneous linear differential equation, and the general solution of the equation is:
[0048] ;
[0049] Solved The expression is: ;
[0050] Tilt the arc start point And the initial velocity at this time Substituting the initial conditions into the above formula gives:
[0051] ;
[0052] The solution is speed The formula is:
[0053] ;
[0054] The necessary condition for the material to maintain contact on the slide is ,when When the material flies off the chute, It is the critical condition for the contact and separation between the material and the slide. ,available: .
[0055] In order to ensure smooth material discharge and prevent jamming before collision, the initial curvature of the slide should be greater than the static friction angle of the material. As the material slides down, the speed increases. Therefore, the material has the highest speed at the end of the arc and is most easily separated from the slide. That is, it only needs to ensure that the material runs to the inclination angle at the end of the arc. and speed Satisfy the speed formula.
[0056] Arrange , substituting into the above formula:
[0057] , where , and we get: .
[0058] Will It is defined as the value when the equal sign in the above formula holds. From the above formula, we can see that only the initial velocity of the material at the starting point of the arc is needed. , the arc's first end curvature , end arc (The other parameters are constants) and the radius of the material moving on the arc can be solved The conditions for satisfying When the material does not fly off the slide, the actual radius of the arc can be obtained based on the speed formula. 、The beginning of the arc curve = radian , Arc end angle Obtain the terminal speed of the first arc curve of the material cutting curve , while the terminal speed As the initial velocity of the second arc .
[0059] The method also includes: assigning a value to the radius of each arc segment should follow:
[0060] 1) The radius of each arc is at least greater than the minimum value R of the curvature radius of motion calculated by dynamic analysis min .
[0061] 2) When the cigarette moves on the slide curve, it should be avoided that the cigarette comes into contact with the vertical baffle prematurely within the set low arc value.
[0062] In practical applications, the width w of the channel at the material receiving point should be at least greater than the width d of the material to prevent the material from not being able to be unloaded smoothly. , it means that the material cannot touch the wall to change its posture, and consider adjusting the width w of the channel at the docking point.
[0063] The method also includes: using the initial arc β0 and the ending arc β1 of the feed slide curve as boundaries, distributing the slide curve into multiple arcs according to the arc, the initial arc β0 being greater than the static friction angle between the cigarette and the slide, and the ending arc β1 being less than 90 degrees.
[0064] In actual applications, the design of the slide takes into account many factors: the size specification limit of the slide application scenario, the initial velocity of the material when it starts to slide, the size of the material, and the friction coefficient between the slide and the material. Based on the above three points, the total curve is designed. According to the initial arc β0 of the total curve and the end arc β1 as the boundary, the slide curve is divided into multiple arcs according to the arc. The initial arc β0 should be greater than the static friction angle between the material and the slide, and the end arc β1 should be closer to 90 degrees.
[0065] The method further includes:
[0066] Get the actual curvature radius R of the cigarette and the curvature radius R of the slide M The relationship between the curvature radius of the slideway is obtained according to the relationship between the curvature radius of the slideway and the curvature radius of the slideway. The relationship between the curvature radius of the slideway and the curvature radius of the slideway is obtained according to the relationship between the curvature radius of the slideway and the curvature radius of the slideway. M +d / 2.
[0067] The method further includes:
[0068] The curvature of the material discharge chute curve increases as the cigarette slides down, and the curvature radius of the curve arc assigned to the front section of the material discharge chute curve is smaller than the curvature radius of the material discharge chute curve corresponding to the increase in the curvature of the rear section.
[0069] Specifically, when the unloading chute curve is determined, the coordinates of the points on the curve are And the inclination angle of the material moving to this point (The arc of this point) is uniquely determined. To ensure that the material does not touch the vertical baffle on a certain arc, the equation can be listed: If the material does not satisfy the above equation at a small arc, it means that the radius of curvature assigned to the arc is too small, the slideway specifications are too small relative to the size of the material, and there is not enough space for the material to be unloaded. The speed of the material is positively correlated, so as the curvature of the slide increases, It also increases accordingly, and the arc at the front section of the slide curve should be assigned a smaller curvature radius R as much as possible.
[0070] It can be seen that the present invention provides a method for designing a material discharge chute for cigarettes, which ensures that the cigarettes are not separated from the chute before contacting the vertical baffle plate by designing the material discharge chute curve, and avoids the cigarettes from flying off the chute in advance and colliding with it, thereby affecting the physical properties of the cigarettes. The existing cigarette material discharge chute design is mainly based on experience, which easily causes cigarettes to get stuck and fly off the chute. The scientificity and theoretical nature of the cigarette material discharge chute design can be increased, the accuracy of automatic cigarette discharge control can be improved, the damage rate of cigarettes can be reduced, and the quality of cigarette production can be improved.
[0071] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings. The above is only a preferred embodiment of the present invention, but the present invention is not limited to the scope of implementation shown in the drawings. Any changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the description and drawings, should be within the protection scope of the present invention.
Claims
1. A method for designing a feeding chute for cigarettes, characterized in that: include: Get the length of the cigarette , cigarette width d, slide end width w and friction coefficient μ between cigarette and slide, and establish point coordinate constraint equation on the unloading slide curve with the constraint condition that cigarette does not touch the vertical baffle on the slide; Determine the point coordinates of the material discharge chute curve according to the change of the inclination angle of the cigarette on the material discharge chute and the point coordinate constraint equation; Obtain the starting point and end point of the slideway, establish a coordinate system with the end point of the slideway as the origin, and construct the curvature radius constraint equation of the unloading slideway curve; The curvature radius of the discharge chute curve is determined according to the changes in the speed and curvature of the cigarettes on the discharge chute and the curvature radius constraint equation.
2. The method for designing a cigarette feeding chute according to claim 1, characterized in that: Also includes: According to the point coordinates and curvature radius of the unloading slideway curve, multiple arcs with different curvature radii are constructed so that the arc at the end of the previous arc is the arc at the beginning of the next arc.
3. The method for designing a cigarette feeding chute according to claim 2, characterized in that: The coordinate point constraint equation is: ,in, is the inclination angle of the cigarette movement, It is the X-axis value of the coordinate of the point where the cigarette moves.
4. The method for designing a cigarette feeding chute according to claim 3, characterized in that: The curvature radius constraint equation is: , where e is a mathematical constant, g is the acceleration due to gravity, is the initial velocity, R is the curvature radius of motion, is the arc angle at the beginning of the arc, is the arc end angle, is the change in radians.
5. The method for designing a cigarette feeding chute according to claim 4, characterized in that: Also includes: The radius of each arc should be assigned as follows: The radius of each arc is at least greater than the minimum value R of the curvature radius of motion calculated by dynamic analysis. min ; When the cigarette moves on the slide curve, it should be avoided that the cigarette comes into contact with the vertical baffle prematurely within the set low arc value.
6. The method for designing a cigarette feeding chute according to claim 5, characterized in that: Also includes: The initial arc β0 and the ending arc β1 of the unloading slide curve are used as boundaries, and the slide curve is divided into multiple arcs according to the arc. The initial arc β0 is greater than the static friction angle between the cigarette and the slide, and the ending arc β1 is less than 90 degrees.
7. The method for designing a cigarette feeding chute according to claim 6, characterized in that: Also includes: Get the actual curvature radius R of the cigarette and the curvature radius R of the slide M The relationship between the curvature radius of the slideway is obtained according to the relationship between the curvature radius of the slideway and the curvature radius of the slideway. The relationship between the curvature radius of the slideway and the curvature radius of the slideway is obtained according to the relationship between the curvature radius of the slideway and the curvature radius of the slideway. M +d / 2.
8. The method for designing a cigarette feeding chute according to claim 7, characterized in that: Also includes: The curvature of the material discharge chute curve increases as the cigarette slides down, and the curvature radius of the curve arc assigned to the front section of the material discharge chute curve is smaller than the curvature radius of the material discharge chute curve corresponding to the increase in the curvature of the rear section.
9. The method for designing a cigarette feeding chute according to claim 8, characterized in that: Also includes: The curve of the cigarette chute is a convex curve structure, so that the cigarette can be transformed from a horizontal posture to a vertical posture.