CN106628368B - Continuous conveying device capable of rotating materials by 90 degrees based on special-shaped screw rod - Google Patents
Continuous conveying device capable of rotating materials by 90 degrees based on special-shaped screw rod Download PDFInfo
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Abstract
Description
技术领域technical field
本发明涉及物料包装传输设备技术领域，特别是涉及一种基于异形螺杆将物料旋转90度的连续输送装置。The invention relates to the technical field of material packaging and conveying equipment, in particular to a continuous conveying device that rotates materials by 90 degrees based on a special-shaped screw.
背景技术Background technique
现代社会商品在贸易流通中竞争日趋激烈，在保证产品质量前提下，产品包装形式也是日新月异，消费者对商品外包装的要求越来越高，产品外观和功能协调结合满足了消费者的要求。包装机械是自动化程度较高的机械设备，它可以大幅度提高生产效率，改善生产环境，降低生产成本，提高商品档次，增加产品附加值，从而增强商品的市场竞争力、带来更大的社会效益和经济效益。Commodities in modern society are increasingly competitive in trade and circulation. Under the premise of ensuring product quality, the form of product packaging is also changing with each passing day. Consumers have higher and higher requirements for commodity packaging. The coordinated combination of product appearance and function meets consumers' requirements. Packaging machinery is a mechanical device with a high degree of automation. It can greatly increase production efficiency, improve the production environment, reduce production costs, improve commodity grades, and increase product added value, thereby enhancing the market competitiveness of commodities and bringing greater social benefits. benefits and economic benefits.
现代生产过程中经常需要对一列连续物料沿着其自身竖直轴线旋转一定角度后输出以便下个工序的高效实施，现有生产线上一般采用气动装置或间歇机械机构装置等实现连续物料的旋转供送，生产过程中速度冲击大，工作节拍慢，不能做到高速、稳定的供送，致使生产效率降低，并且这些装置安装在生产线上机构复杂，占用空间大，生产过程中噪声大，成本高，不能满足当今产品包装的生产要求。目前在生产过程中尚无采用异形螺杆对连续输送过程中的物料旋转装置。In the modern production process, it is often necessary to rotate a row of continuous materials along its own vertical axis at a certain angle before outputting for the efficient implementation of the next process. Pneumatic devices or intermittent mechanical mechanism devices are generally used in existing production lines to realize the continuous material rotation. In the production process, the speed impact is large, the working rhythm is slow, and high-speed and stable supply cannot be achieved, resulting in a decrease in production efficiency. Moreover, these devices are installed on the production line with complex mechanisms, large space occupation, high noise and high cost during production. , can not meet the production requirements of today's product packaging. At present, there is no special-shaped screw used in the production process to rotate the material in the continuous conveying process.
发明内容Contents of the invention
本发明的目的是提供一种基于异形螺杆将物料旋转90度的连续输送装置，可以很好地克服现有技术的缺陷，实现结构简单、噪声小、连续高速且稳定无冲击的旋转连续物料的目的。The purpose of the present invention is to provide a continuous conveying device that rotates materials by 90 degrees based on a special-shaped screw, which can well overcome the defects of the prior art, and realize the rotating continuous materials with simple structure, low noise, continuous high speed, stability and no impact. Purpose.
为了实现上述目的，本发明的方案是：一种基于异形螺杆将物料旋转90度 的连续输送装置，包括输送带、供送螺杆、驱动装置和支撑装置，驱动装置用于驱动供送螺杆，供送螺杆和驱动装置可拆卸的安装在支撑装置上；所述输送带用于连续输送形状相同的被供送物料，所述供送螺杆是位于输送带上端两侧且与输送带平行的两根异形螺杆，两根异形螺杆方向相反同步旋转，所述形状相同的被供送物料与输送带平行，且头尾相连排成一列从两根异形螺杆一端输入，随着异形螺杆的螺距和槽深的变化被供送物料沿着其自身竖直轴线旋转90度后，从两根异形螺杆的另一端输出到输送带上。In order to achieve the above object, the solution of the present invention is: a continuous conveying device that rotates materials by 90 degrees based on a special-shaped screw, including a conveyor belt, a feeding screw, a driving device and a supporting device, and the driving device is used to drive the feeding screw. The feeding screw and the driving device are detachably installed on the supporting device; the conveyor belt is used to continuously convey the fed materials with the same shape, and the feeding screw is two parallel to the conveyor belt located on both sides of the upper end of the conveyor belt Special-shaped screw, the two special-shaped screws rotate in opposite directions synchronously, the fed materials of the same shape are parallel to the conveyor belt, and are connected head to tail in a row and input from one end of the two special-shaped screws, with the pitch and groove depth of the special-shaped screw After the material being fed rotates 90 degrees along its own vertical axis, it is output to the conveyor belt from the other end of the two special-shaped screws.
优选地，所述异形螺杆包括初段、中段和后段三部分，所述初段为等螺距等槽深的螺旋槽，用于引入物料；所述中段为既变螺距又变槽深的螺旋槽，用于将被供送物料进行一定角度的旋转；所述后段为等螺距等槽深的螺旋槽，用于将旋转90度角后的物料排成一列无间隔的输出。Preferably, the special-shaped screw includes three parts: an initial section, a middle section and a rear section. The initial section is a spiral groove with equal pitch and equal groove depth for introducing materials; the middle section is a spiral groove with variable pitch and variable groove depth. It is used to rotate the supplied materials at a certain angle; the rear section is a spiral groove with equal pitch and groove depth, which is used to arrange the materials rotated at an angle of 90 degrees in a row and output them without intervals.
优选地，所述被供送物料在供送螺杆中一方面随着螺旋槽的旋转向前平动，一方面随螺旋槽截面形状变化而沿自身竖直轴线进行旋转，供送螺杆输出被供送物料的线速度与输送带速度相等，整个旋转过程高速且稳定，无运动的刚性冲击。Preferably, on the one hand, the material to be fed translates forward with the rotation of the helical groove in the feeding screw, and on the other hand, it rotates along its own vertical axis with the change of the cross-sectional shape of the helical groove, and the output of the feeding screw is supplied The linear speed of feeding materials is equal to the speed of the conveyor belt, and the whole rotation process is high-speed and stable, without rigid impact of movement.
优选地，所述被供送物料是大小相等、外形相同的球状、瓶状或罐状的固体物料，瓶状或罐状物料的横截面是圆形、方形、椭圆形或多边形；所述两根异形螺杆的截面空隙形成可容被供送物料通过的通道，被供送物料的外表面与异形螺杆的螺旋槽面空间啮合且时刻处于线接触状态，被供送物料在螺旋槽带动下沿着异形螺杆轴向和径向做复合运动，保证物料供送的稳定性。Preferably, the materials to be fed are spherical, bottle-shaped or tank-shaped solid materials with the same size and shape, and the cross-section of the bottle-shaped or tank-shaped materials is circular, square, elliptical or polygonal; the two The cross-sectional gap of the special-shaped screw forms a channel that can accommodate the material to be fed. The outer surface of the material to be fed is meshed with the surface of the spiral groove of the special-shaped screw and is in a line contact state at all times. The material to be fed is driven by the spiral groove. The compound movement of the special-shaped screw in the axial and radial directions ensures the stability of material supply.
优选地，在所述复合运动的过程中，被供送物料的加速度变化分为等速段、变加速段、等加速段和变减加速度段，且各段间加速度变化采用三角函数曲线平滑过渡，以避免加速度突变带来的刚性冲击。Preferably, in the process of the compound movement, the acceleration change of the material to be fed is divided into a constant speed section, a variable acceleration section, a constant acceleration section and a variable deceleration acceleration section, and the acceleration changes between each section adopt a trigonometric function curve for a smooth transition In order to avoid the rigid impact caused by sudden acceleration changes.
优选地，所述两根异形螺杆分别由两套相同的驱动装置驱动；所述驱动装置包括伺服电机、减速器、同步带轮和同步带，所述伺服电机和异形螺杆的端部均设有同步带轮，所述同步带轮上配置同步带，所述同步带用于连接伺服电机和对应的异形螺杆之间的传动；所述驱动装置还包括运动控制器和伺服电机驱动器，运动控制器根据物料数量和输送带速度计算供送螺杆所需的转速，并将该速度输出给伺服电机驱动器，伺服电机驱动器控制伺服电机旋转，完成两根异形螺杆的同步反向旋转。Preferably, the two special-shaped screws are respectively driven by two sets of the same driving device; the driving device includes a servo motor, a reducer, a synchronous pulley and a synchronous belt, and the ends of the servo motor and the special-shaped screw are equipped with A synchronous pulley, a synchronous belt is configured on the synchronous belt, and the synchronous belt is used to connect the transmission between the servo motor and the corresponding special-shaped screw; the drive device also includes a motion controller and a servo motor driver, and the motion controller According to the amount of material and the speed of the conveyor belt, the required speed of the feeding screw is calculated, and the speed is output to the servo motor driver. The servo motor driver controls the rotation of the servo motor to complete the synchronous reverse rotation of the two special-shaped screws.
优选地，两根异形螺杆分别由两套相同的支撑装置支撑，所述支撑装置包括平行于输送带的支座，支座的一端设有螺杆支架，另一端还设置有带有锁紧结构件的导轨支座；所述伺服电机、减速器可拆卸的固定在螺杆支架的一端，导轨支座用于支撑与输送带平行的导轨，导轨的一端设有导轨基座，导轨基座用于固定顶尖支座；锁紧结构件松开时，顶尖支座和导轨可以一起沿着输送带的方向水平移动；所述异形螺杆一端固定在顶尖支座上，另一端固定在螺杆支架上。Preferably, the two special-shaped screws are respectively supported by two sets of the same support device, the support device includes a support parallel to the conveyor belt, one end of the support is provided with a screw support, and the other end is also provided with a locking structure. The guide rail support; the servo motor and the reducer are detachably fixed on one end of the screw bracket. The guide rail support is used to support the guide rail parallel to the conveyor belt. One end of the guide rail is provided with a guide rail base, which is used to fix Top support; when the locking structure is released, the top support and the guide rail can move horizontally along the direction of the conveyor belt; one end of the special-shaped screw is fixed on the top support, and the other end is fixed on the screw support.
本发明结构简单，性能可靠，采用模块化设计，结构紧凑，成本低，生产过程中噪声小且无刚性冲击，速度调整便捷，而且该装置在生产线上的装配和调整非常方便。该旋转装置可广泛应用于日化、医药、卫生、食品、包装等行业，以配合完成贴标、清洗、打码、充填、灌装等工序的高速工作。The invention has simple structure, reliable performance, modular design, compact structure, low cost, low noise and no rigid impact in the production process, convenient speed adjustment, and very convenient assembly and adjustment of the device on the production line. The rotating device can be widely used in daily chemical, medicine, hygiene, food, packaging and other industries to cooperate with the high-speed work of labeling, cleaning, coding, filling, filling and other processes.
本发明的附加优点、目的，以及特征将在下面的描述中部分地加以阐述，且将对于本领域普通技术人员在研究下文后部分地变得明显，或者可以根据本发明的实践而获知。本发明的目的和其它优点可以通过在书面说明及其权利要求书以及附图中具体指出的结构实现到并获得。Additional advantages, objects, and features of the present invention will be set forth in part in the following description, and in part will become apparent to those of ordinary skill in the art after studying the following, or may be learned by practice of the present invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
本领域技术人员将会理解的是，能够用本发明实现的目的和优点不限于以 上具体所述，并且根据以下详细说明将更清楚地理解本发明能够实现的上述和其他目的。It will be understood by those skilled in the art that the objects and advantages that can be achieved with the present invention are not limited to the above specific description, and the above and other objects that can be achieved by the present invention will be more clearly understood from the following detailed description.
附图说明Description of drawings
图1为本发明装置的一种结构示意图；Fig. 1 is a kind of structural representation of device of the present invention;
图2为本发明装置物料在0度相位时与供送螺杆的结构示意图；Fig. 2 is the structural representation of the material of the device of the present invention and the feeding screw when the phase is 0 degree;
图3为本发明装置物料在90度相位时与供送螺杆的结构示意图；Fig. 3 is the structural representation of the material of the device of the present invention and the feeding screw when the phase is 90 degrees;
图4为本发明装置物料在180度相位时与供送螺杆的结构示意图；Fig. 4 is the structural representation of the material of the device of the present invention and the feeding screw when the phase is 180 degrees;
图5为本发明装置物料在270度相位时与供送螺杆的结构示意图；Fig. 5 is the structural representation of the material of the device of the present invention and the feeding screw when the phase is 270 degrees;
图6为被供送物料在复合运动过程中的加速度变化曲线；Fig. 6 is the acceleration change curve of the supplied material during the compound movement;
图7为被供送物料与异形螺杆的螺旋槽面的交截面片产生示意图；Fig. 7 is a schematic diagram of the cross section of the fed material and the spiral groove surface of the special-shaped screw;
图中：1-输送带；2-供送螺杆；3-同步带；4-螺杆支架；5-支座；6-减速器；7-伺服电机；8-导轨；9-锁紧结构件；10-导轨支座；11-导轨基座；12-顶尖支座。In the figure: 1-conveyor belt; 2-feeding screw; 3-synchronous belt; 4-screw bracket; 5-support; 6-reducer; 7-servo motor; 8-guide rail; 9-locking structure; 10-rail support; 11-rail base; 12-top support.
具体实施方式Detailed ways
下面结合附图和实施例，对本发明的具体实施方式作进一步详细描述。以下实施例用于说明本发明，但不用来限制本发明的范围。The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
如图1至图7所示，为本发明的一种实施例的结构，一种基于异形螺杆将物料旋转90度的连续输送装置，包括输送带1、供送螺杆2、驱动装置和支撑装置，驱动装置用于驱动供送螺杆2，供送螺杆2和驱动装置可拆卸的安装在支撑装置上；所述输送带1用于连续输送形状相同的刚性/半刚性(金属壳体/非金属壳体)被供送物料，所述供送螺杆2是位于输送带1上端两侧且与输送带1平行的两根异形螺杆，两根异形螺杆方向相反同步旋转，如图2所示，给出了 异形螺杆的旋转方向与被供送物料的前进方向。所述形状相同的被供送物料与输送带1平行，且头尾相连排成一列从两根异形螺杆一端输入，随着异形螺杆的螺距和槽深的变化被供送物料沿着自身竖直轴线旋转90度后，从两根异形螺杆的另一端输出到输送带1上。As shown in Figures 1 to 7, it is the structure of an embodiment of the present invention, a continuous conveying device that rotates materials by 90 degrees based on a special-shaped screw, including a
两根异形螺杆的螺旋方向相反。异形螺杆包括初段、中段和后段三部分，所述初段为等螺距等槽深的螺旋槽，用于引入物料；所述中段为既变螺距又变槽深的螺旋槽，用于将被供送物料进行一定角度的旋转；所述后段为等螺距等槽深的螺旋槽，用于将旋转90度角后的物料排成一列无间隔的输出。The helical directions of the two special-shaped screws are opposite. The special-shaped screw consists of three parts: the initial section, the middle section and the rear section. The initial section is a spiral groove with equal pitch and groove depth, which is used to introduce materials; the middle section is a spiral groove with variable pitch and groove depth, which is used for feeding The material is sent to rotate at a certain angle; the rear section is a spiral groove with equal pitch and groove depth, which is used to arrange the materials rotated at an angle of 90 degrees in a row and output without intervals.
被供送物料在供送螺杆2中一方面随着螺旋槽的旋转向前平动，一方面随螺旋槽截面形状变化而沿自身竖直轴线进行旋转，供送螺杆2输出被供送物料的线速度与输送带1速度相等，整个旋转过程高速且稳定，无运动的刚性冲击。The material to be fed in the
被供送物料是大小相等、外形相同的球状、瓶状或罐状的固体物料，瓶状或罐状物料的横截面是圆形、方形、椭圆形或多边形，本实施例中，被供送物料的横截面是椭圆形。两根异形螺杆的截面空隙形成可容被供送物料通过的通道，被供送物料的外表面与异形螺杆的螺旋槽面空间啮合且时刻处于线接触状态，被供送物料在螺旋槽带动下沿着异形螺杆轴向和径向做复合运动，保证物料供送的稳定性。在供送过程中，只有同时保证螺杆螺旋槽面与被供送物料曲面的紧密啮合，即螺旋槽面的形状严格的随二者交截面形状的变化规律而变化，供送的稳定性才能得到保证。二者相对运动反映到几何学中，如图7所示，以∑作为假想被供送物料的母面，与螺杆的螺旋槽面∑1做工艺啮合，二者交截面∑c沿螺杆轴线做简单或复合运动，同时螺杆绕自身的轴线以角速度ω转动，螺杆的螺旋槽面∑1作为交截面∑c在相对运动中的包络被展成。The material to be fed is a spherical, bottle-shaped or can-shaped solid material with the same size and shape. The cross-section of the bottle-shaped or can-shaped material is circular, square, elliptical or polygonal. The cross-section of the material is oval. The cross-sectional gap of the two special-shaped screws forms a channel that can accommodate the material to be fed. The outer surface of the material to be fed is meshed with the spiral groove surface of the special-shaped screw and is in line contact at all times. The material to be fed is driven by the spiral groove. Composite movement along the axial and radial directions of the special-shaped screw ensures the stability of material supply. During the feeding process, the stability of the feeding can be obtained only when the close engagement between the screw helical groove surface and the curved surface of the material being fed is ensured at the same time, that is, the shape of the helical groove surface strictly changes with the shape of the cross-section of the two. ensure. The relative movement of the two is reflected in the geometry, as shown in Figure 7, with Σ as the imaginary parent surface of the material to be fed, which is engaged with the spiral groove surface Σ 1 of the screw, and the intersection section Σc of the two is made along the axis of the screw. Simple or compound motion, while the screw rotates around its own axis at an angular velocity ω, the helical groove surface Σ 1 of the screw is developed as the envelope of the cross section Σc in relative motion.
在复合运动的过程中，被供送物料的加速度变化分为等速段Ⅰ、变加速段 Ⅱ、等加速段Ⅲ和变减加速度段Ⅳ，且各段间加速度变化采用三角函数曲线平滑过渡，以避免加速度突变带来的刚性冲击。为实现供送过程中被供送物料运动速度变化的连续性和平缓性，避免惯性冲击，保证供送运动高速性和稳定性，本发明提出了稳态供送变加速度运动，即在被供送物料行进过程中加速度变化各段采用三角函数过渡，如图6所示。这也是异形螺杆的螺旋线变化形式。异形螺杆的螺旋线形式是关乎螺旋槽形以及物料供送稳定性的关键因素。其计算方式如下：In the process of compound movement, the acceleration change of the material being fed is divided into constant velocity section I, variable acceleration section II, constant acceleration section III and variable deceleration acceleration section IV, and the acceleration changes between each section adopt trigonometric function curves for smooth transition. In order to avoid the rigid shock caused by sudden acceleration. In order to realize the continuity and gentleness of the velocity change of the material being fed during the feeding process, avoid inertial impact, and ensure the high speed and stability of the feeding motion, the present invention proposes a steady-state feeding variable acceleration motion, that is, when the fed material During the process of feeding the material, each section of the acceleration change adopts a trigonometric function transition, as shown in Figure 6. This is also the helical variation of the special-shaped screw. The helical form of the special-shaped screw is a key factor related to the shape of the helical groove and the stability of material supply. It is calculated as follows:
式中T-周期(s)，其值由各段的总时间确定；t2-时间(s)；am-等加速度段加速度(mm/s2)；ci——积分常量，i＝1,2,3,4。上述Ⅰ、Ⅱ、Ⅲ和Ⅳ螺旋线的构造方式可以根据实际情况，选取部分或全部。In the formula, T-period (s), its value is determined by the total time of each section; t 2 -time (s); a m -acceleration of constant acceleration section (mm/s 2 ); c i ——integral constant, i= 1,2,3,4. Some or all of the construction methods of the above-mentioned I, II, III and IV helices can be selected according to the actual situation.
所述的异形螺杆的结构可以根据被供送物料的形状通过构建螺旋线数学模型、构建螺旋槽数学模型的方式实现。其中：所述构建螺旋线数学模型如图6所示和以上论述。The structure of the special-shaped screw can be realized by constructing a mathematical model of a helix and a mathematical model of a spiral groove according to the shape of the material to be fed. Wherein: the construction of the spiral mathematical model is shown in Figure 6 and discussed above.
所述构建螺旋槽数学模型：螺杆供送的整个运动由两个简单运动合成，即螺杆的旋转运动和被供送物料的移动或者其他类型的运动。构建螺杆的螺旋槽面本质就是考察被供送物料与螺杆的相对位置关系，本发明中被供送物料的运动形式已确定，通过两个或者多个坐标系之间的坐标变换就可以求解出与被供送物料曲面相啮合的螺旋槽的曲面方程。The construction of the mathematical model of the spiral groove: the entire movement of the screw feeding is synthesized by two simple movements, namely, the rotation movement of the screw and the movement of the material being fed or other types of movement. The essence of constructing the spiral groove surface of the screw is to investigate the relative positional relationship between the material to be fed and the screw. In the present invention, the motion form of the material to be fed has been determined, and can be solved by coordinate transformation between two or more coordinate systems. The surface equation of the helical groove that meshes with the surface of the material being fed.
在构建螺旋槽数学模型中需要确定：螺旋槽面成形几何原理、单参数曲面 族的包络面方程求解、基于单参数包络理论的螺旋槽面数学建模、交截面片族方程求解、啮合方程求解、螺旋槽曲面方程等方面的工作；这些都可以从构建螺旋槽数学模型中建立获得。In the construction of the mathematical model of the spiral groove, it is necessary to determine: the geometric principle of the spiral groove surface forming, the solution of the envelope surface equation of the single-parameter surface family, the mathematical modeling of the spiral groove surface based on the single-parameter envelope theory, the solution of the cross-section slice family equation, the meshing Equation solving, spiral groove surface equation, etc.; these can be obtained from the establishment of the mathematical model of the spiral groove.
两根异形螺杆分别由两套相同的驱动装置驱动；所述驱动装置包括伺服电机7、减速器6、同步带轮和同步带3，所述伺服电机7和异形螺杆的端部均设有同步带轮，所述同步带轮上配置同步带3，所述同步带3用于连接伺服电机7和对应的异形螺杆之间的传动；所述驱动装置还包括运动控制器和伺服电机驱动器，运动控制器根据物料数量和输送带1速度计算供送螺杆2所需的转速，并将该速度输出给伺服电机7驱动器，伺服电机驱动器控制伺服电机7旋转，完成两根异形螺杆的同步反向旋转。当物料数量变化时，运动控制器会跟随物料数量的变化来调节供送螺杆的转速。装置还包括光栅传感器用于监测并反馈螺杆转动情况，确保两根异形螺杆速度同步且旋向相反，保持相对相位不变。The two special-shaped screws are respectively driven by two sets of the same driving device; the driving device includes a
两根异形螺杆也可分为主动异形螺杆和从动异形螺杆，主动异形螺杆通过同步齿轮带动从动异形螺杆同步转动，主动异形螺杆由驱动装置驱动，但本实施例中为了减少传动元件，便于螺杆初始相位调整以及减小设备空间，采用两根异形螺杆分别由两套相同的驱动装置驱动的方案。The two special-shaped screws can also be divided into the active special-shaped screw and the driven special-shaped screw. The active special-shaped screw drives the driven special-shaped screw to rotate synchronously through the synchronous gear, and the active special-shaped screw is driven by the driving device. The initial phase adjustment of the screw and the reduction of equipment space adopt the scheme that two special-shaped screws are respectively driven by two sets of identical driving devices.
优选地，两根异形螺杆分别由两套相同的支撑装置支撑，所述支撑装置包括平行于输送带1的支座5，支座5的一端设有螺杆支架4，另一端还设置有带有锁紧结构件9的导轨支座10；所述伺服电机7、减速器6可拆卸的固定在螺杆支架4的一端，导轨支座10用于支撑与输送带1平行的导轨8，导轨8的一端设有导轨基座11，导轨基座11用于固定顶尖支座12；锁紧结构件9松开时，顶尖支座12和导轨8可以一起沿着输送带1的方向水平移动；所述异形螺杆一端固定在顶尖支座12上，另一端固定在螺杆支架4上。所述锁紧结构件9可以 是肘夹。Preferably, the two special-shaped screws are respectively supported by two sets of identical support devices, the support devices include a
上述各实施例可在不脱离本发明的保护范围下加以若干变化，故以上的说明所包含及附图中所示的结构应视为例示性，而非用以限制本发明申请专利的保护范围。The above-mentioned embodiments can be changed without departing from the protection scope of the present invention, so the structures included in the above description and shown in the accompanying drawings should be regarded as illustrative rather than limiting the protection scope of the patent application for the present invention .
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