CN104908056A - Three-finger mechanical gripper with variable structure - Google Patents

Three-finger mechanical gripper with variable structure Download PDF

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CN104908056A
CN104908056A CN201510367511.1A CN201510367511A CN104908056A CN 104908056 A CN104908056 A CN 104908056A CN 201510367511 A CN201510367511 A CN 201510367511A CN 104908056 A CN104908056 A CN 104908056A
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knuckle
finger
palm
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mechanical paw
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CN104908056B (en
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张福海
付宜利
李国志
曲家迪
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Gao Wenpeng
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Harbin Institute of Technology Shenzhen
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Abstract

一种可变构型的三指机械手爪,它涉及一种三指机械手爪。本发明解决了现有的三指机械手爪存在体积大、维护保养成本高以及整个手爪存在一定的抓取构型局限性的问题。旋转底座上均布设置有三个旋转轴,每个手指底端电机的输出轴与相应的一个蜗杆固接,每个蜗杆与相应的一个涡轮相互啮合,每个小直齿轮与相应的一个大直齿轮相互啮合;每个手指关节电机的输出轴上固套有一个耦合连杆,耦合连杆的一端通过第一驱动杆与第二指节的短边末端连接,耦合连杆的另一端通过第二驱动杆与第一连接杆的一端和第二连接杆的一端连接,第一连接杆的另一端与第二指节连接,第二指节的长边末端、第二连接杆的另一端均与第一指节连接。本发明用于机器人技术领域。

A variable-configuration three-finger mechanical gripper relates to a three-finger mechanical gripper. The invention solves the problems that the existing three-finger mechanical gripper has large volume, high maintenance cost and certain limitation of grasping configuration of the whole gripper. There are three rotating shafts evenly distributed on the rotating base, the output shaft of the motor at the bottom of each finger is fixedly connected with a corresponding worm, each worm is meshed with a corresponding worm gear, and each small spur gear is connected with a corresponding large straight gear. The gears mesh with each other; a coupling link is sheathed on the output shaft of each finger joint motor, one end of the coupling link is connected to the short side end of the second knuckle through the first drive rod, and the other end of the coupling link is connected through the second knuckle. The two driving rods are connected with one end of the first connecting rod and one end of the second connecting rod, the other end of the first connecting rod is connected with the second knuckle, the long side end of the second knuckle and the other end of the second connecting rod are both Connect with the first knuckle. The invention is used in the field of robot technology.

Description

一种可变构型的三指机械手爪A variable-configuration three-finger robotic gripper

技术领域technical field

本发明涉及一种三指机械手爪,具体涉及一种可变构型的三指机械手爪。The invention relates to a three-finger mechanical gripper, in particular to a variable-configuration three-finger robotic gripper.

背景技术Background technique

模仿人类的手来设计机器人的末端执行器以使其具有类似人类手的工作能力,从而使这些机械手爪可以替代人类完成工作任务,增强了机器人末端执行器的通用性和灵活性。在设计机械手爪的过程中,机械手爪结构和机械手爪抓取构型是实现抓取稳定性和适应性的重要研究内容。The end effector of the robot is designed by imitating the human hand so that it has the working ability similar to that of the human hand, so that these mechanical grippers can replace humans to complete the work tasks, which enhances the versatility and flexibility of the robot end effector. In the process of designing the gripper, the structure of the gripper and the gripping configuration of the gripper are important research contents to achieve gripping stability and adaptability.

在机械手爪的研究中,机器人末端执行器的设计结构需要考虑如何使机械手爪具有接近人手的灵活度,具有多种抓取构型,并且体积小、重量轻。当机器人的关节数量增多的时候,关节驱动器的体积和重量成为一个重要的考量。此时,可以通过减少驱动器数量使其构成一个具有耦合关节的机构,降低了对控制系统的要求。为了适应不同形状的被作用物体,可以设计机器人末端执行器具备多种抓取构型。通过控制输入变量实现机构的确定运动,使手爪作业时针对物体形状构成确定的抓取构型,从而可以增强抓取稳定性,并提高机器人在实际作业环境中的工作能力。In the research of the robotic gripper, the design structure of the robot end effector needs to consider how to make the robotic gripper have the flexibility close to the human hand, have a variety of grasping configurations, and be small in size and light in weight. When the number of joints of the robot increases, the size and weight of the joint driver becomes an important consideration. At this time, the number of drives can be reduced to form a mechanism with coupling joints, which reduces the requirements for the control system. In order to adapt to objects of different shapes, the robot end effector can be designed to have multiple grasping configurations. The definite movement of the mechanism is realized by controlling the input variables, so that the claws can form a definite grasping configuration for the shape of the object during operation, thereby enhancing the grasping stability and improving the working ability of the robot in the actual working environment.

美国专利US5762390A中公开了经典的具有非固定式耦合关节的三指手爪。这款三指手爪利用单点固定四杆机构原理,结合两个指关节之间的弹簧拉伸作用,使三指手爪在执行不同的抓取任务过程中可以适应被抓取物体的形状,直至保持一定的抓取姿态。但是该专利中的三指手爪采用了液压驱动的方式,会出现油路密封问题,系统体积也较大,同时维护和保养成本较高。A classic three-fingered gripper with non-fixed coupling joints is disclosed in US Pat. No. 5,762,390A. This three-finger gripper uses the principle of a single-point fixed four-bar mechanism, combined with the spring tension between the two knuckles, so that the three-finger gripper can adapt to the shape of the grasped object during the execution of different grasping tasks , until a certain grasping posture is maintained. However, the three-finger gripper in this patent adopts a hydraulic drive method, which will cause oil circuit sealing problems, the system volume is also large, and the maintenance and maintenance costs are high.

中国专利CN101844358B中公开了一种具有三个手指的变构型机械手爪旋转移动装置,该手爪利用构成四边形机构的两个扇形齿轮以及两个连杆来改变手指的指向,从而构成不同的抓取构型,但是其中两个手指之间存在耦合,另一个不耦合的手指由于底部结构固定而不能改变手指的指向,整个手爪存在一定的抓取构型局限性。Chinese patent CN101844358B discloses a three-finger variable-configuration mechanical claw rotary movement device. The claw uses two sector gears and two connecting rods that constitute a quadrilateral mechanism to change the direction of the fingers, thereby forming different grips. However, there is coupling between two fingers, and the other uncoupled finger cannot change the direction of the finger due to the fixed bottom structure. The entire gripper has certain limitations in the grasping configuration.

从机构学方面来看,采用耦合关节的机械手爪使机构的控制输入变量的数目小于机构的关节数目,机构也可以确定手指指节的运动路径和轨迹。为了使机械手爪具有较高的灵活性并简化控制系统,需要机构具有较多的自由度,同时使驱动器数量较少。如果机械手爪满足机构实现确定运动的条件,当机械手爪在进行抓取操作时,每个关节都参与驱动工作,那么就可以节省一定的能量,并且在抓取物体时有利于实现形封闭和力封闭。From the perspective of mechanism, the number of control input variables of the mechanism is smaller than the number of joints of the mechanism by using the mechanical gripper with coupled joints, and the mechanism can also determine the motion path and trajectory of the finger knuckles. In order to make the gripper have high flexibility and simplify the control system, it is necessary for the mechanism to have more degrees of freedom and at the same time make the number of drives less. If the manipulator meets the conditions for the mechanism to achieve definite motion, when the manipulator is grasping, each joint participates in the driving work, then a certain amount of energy can be saved, and it is beneficial to achieve shape closure and force when grasping objects. closed.

综上,现有的三指机械手爪存在体积大、维护保养成本高以及整个手爪存在一定的抓取构型局限性的问题。To sum up, the existing three-finger robotic grippers have the problems of large volume, high maintenance cost, and certain limitations of the grasping configuration of the entire gripper.

发明内容Contents of the invention

本发明为解决现有的三指机械手爪存在体积大、维护保养成本高以及整个手爪存在一定的抓取构型局限性的问题,进而提供一种可变构型的三指机械手爪。The present invention provides a three-finger robotic gripper with a variable configuration to solve the problems of large volume, high maintenance cost and certain grasping configuration limitations of the existing three-finger robotic gripper.

本发明为解决上述技术问题采取的技术方案是:The technical scheme that the present invention takes for solving the problems of the technologies described above is:

本发明的可变构型的三指机械手爪包括手掌、旋转底座、中心圆柱、三个旋转轴、三个旋转台、三个手指底端电机、三个涡轮、三个蜗杆、三个大直齿轮、三个小直齿轮和三个手指,旋转底座上设置有三个手指,手掌由手掌下平板、手掌上平板和多个连接圆柱组成,手掌上平板通过多个连接圆柱固装在手掌下平板的上端面上,手掌上平板与手掌下平板平行设置,手掌下平板的下端通过中心圆柱固装在旋转底座上端面中心处;The variable-configuration three-finger robotic gripper of the present invention includes a palm, a rotating base, a central cylinder, three rotating shafts, three rotating tables, three motors at the bottom of fingers, three worm gears, three worms, and three large straight shafts. Gears, three small spur gears and three fingers, three fingers are set on the rotating base, the palm is composed of a flat plate under the palm, a flat plate on the palm and multiple connecting cylinders, the flat plate on the palm is fixed on the flat plate under the palm through multiple connecting cylinders On the upper end surface of the palm, the flat plate on the palm and the flat plate under the palm are arranged in parallel, and the lower end of the flat plate under the palm is fixed on the center of the upper end surface of the rotating base through a central cylinder;

每个手指包括第一指节、第二指节、第一连接杆、第二连接杆、第一驱动杆、第二驱动杆、耦合连杆和手指关节电机,第二指节的形状呈“L”形,每个旋转台上安装有一个手指关节电机,每个手指关节电机的输出轴上固套有一个耦合连杆,耦合连杆的一端通过第一驱动杆与第二指节的短边末端连接,耦合连杆的另一端通过第二驱动杆与第一连接杆的一端和第二连接杆的一端连接,第一连接杆的另一端与第二指节连接,第二指节的长边末端、第二连接杆的另一端均与第一指节连接;Each finger includes a first phalanx, a second phalanx, a first connecting rod, a second connecting rod, a first driving rod, a second driving rod, a coupling connecting rod and a finger joint motor, and the shape of the second phalanx is " L” shape, a finger joint motor is installed on each rotary table, and a coupling link is fixedly sleeved on the output shaft of each finger joint motor, and one end of the coupling link passes through the short link between the first drive rod and the second The other end of the coupling link is connected with one end of the first connecting rod and one end of the second connecting rod through the second driving rod, the other end of the first connecting rod is connected with the second knuckle, and the second knuckle The end of the long side and the other end of the second connecting rod are connected to the first knuckle;

旋转底座上均布设置有三个旋转轴,每个旋转轴上固装有一个旋转台,每个旋转台上安装有一个大直齿轮,每个手指底端电机的输出轴与相应的一个蜗杆固接,每个蜗杆与相应的一个涡轮相互啮合,每个涡轮与相应的一个小直齿轮同轴设置,每个小直齿轮与相应的一个大直齿轮相互啮合。Three rotating shafts are evenly distributed on the rotating base, each rotating shaft is fixed with a rotating table, and each rotating table is equipped with a large spur gear, and the output shaft of the motor at the bottom of each finger is fixed with a corresponding worm screw. Next, each worm meshes with a corresponding worm gear, each worm gear is arranged coaxially with a corresponding small spur gear, and each small spur gear meshes with a corresponding large spur gear.

本发明具有以下有益效果:The present invention has the following beneficial effects:

本发明的可变构型的三指机械手爪的每个手指的主体为单点固定的多连杆机构,每个手指具有三个关节,手指关节电机带动两个驱动连杆控制手指的伸展和弯曲;手指底端电机驱动涡轮蜗杆带动小直齿轮旋转,小直齿轮带动大直齿轮旋转,即可以分别调整三个手指的指向,旋转到所需的角度后手指底端电机将手指的位置锁定;并且三个手指之间不存在机构耦合,与现有的三指机械手爪相比,可实现平行抓取、三指对心抓握和两指捏取等不同的抓取构型,适应对不同形状物体的抓取操作,并且提高了手爪抓取的稳定性;The main body of each finger of the variable-configuration three-finger mechanical gripper of the present invention is a single-point fixed multi-linkage mechanism, each finger has three joints, and the finger joint motor drives two drive links to control the extension and movement of the finger. Bending; the motor at the bottom of the finger drives the worm gear to drive the small spur gear to rotate, and the small spur gear drives the large spur gear to rotate, that is, the pointing of the three fingers can be adjusted separately. After rotating to the desired angle, the motor at the bottom of the finger will lock the position of the finger ; and there is no mechanism coupling between the three fingers. Compared with the existing three-finger gripper, different grasping configurations such as parallel grasping, three-finger centering grasping and two-finger pinching can be realized, adapting to the The grasping operation of objects of different shapes, and the stability of grasping by the claws is improved;

本发明结构紧凑、整体结构尺寸小、重量轻,驱动数目少,从而降低了对控制系统的要求,可靠性高,维护保养成本低。The invention has the advantages of compact structure, small overall structure size, light weight, and fewer driving numbers, thereby reducing the requirements on the control system, high reliability, and low maintenance cost.

附图说明Description of drawings

图1是本发明的可变构型的三指机械手爪的整体机构立体图,图2是本发明具体实施方式一中手指的立体图,图3是本发明具体实施方式一中旋转底座8的立体图,图4是本发明的可变构型的三指机械手爪采用两个手指夹持物体示意图,图5是本发明的可变构型的三指机械手爪采用三个手指对心抓取球体示意图,图6是本发明的可变构型的三指机械手爪采用三个手指平行抓取圆棒示意图。Fig. 1 is a perspective view of the whole mechanism of a variable-configuration three-finger robotic gripper of the present invention, Fig. 2 is a perspective view of fingers in Embodiment 1 of the present invention, and Fig. 3 is a perspective view of rotating base 8 in Embodiment 1 of the present invention, Fig. 4 is a schematic diagram of the variable configuration three-finger robotic gripper of the present invention using two fingers to clamp an object, and Fig. 5 is a schematic diagram of the variable configuration three-finger robotic gripper of the present invention using three fingers to grasp a sphere centering on the center, Fig. 6 is a schematic diagram of a three-fingered mechanical gripper with a variable configuration of the present invention using three fingers to grab a round bar in parallel.

具体实施方式Detailed ways

具体实施方式一:如图1~6所示,本实施方式的可变构型的三指机械手爪包括手掌、旋转底座8、中心圆柱7、三个旋转轴21、三个旋转台20、三个手指底端电机6、三个涡轮23、三个蜗杆24、三个大直齿轮22、三个小直齿轮25和三个手指1,旋转底座8上设置有三个手指1,手掌由手掌下平板2、手掌上平板3和多个连接圆柱4组成,手掌上平板3通过多个连接圆柱4固装在手掌下平板2的上端面上,手掌上平板3与手掌下平板2平行设置,手掌下平板2的下端通过中心圆柱7固装在旋转底座8上端面中心处;Embodiment 1: As shown in Figures 1 to 6, the three-finger mechanical gripper with variable configuration in this embodiment includes a palm, a rotating base 8, a central cylinder 7, three rotating shafts 21, three rotating platforms 20, three A finger bottom motor 6, three turbines 23, three worms 24, three large spur gears 22, three small spur gears 25 and three fingers 1, three fingers 1 are arranged on the rotating base 8, and the palm is formed by the palm of the hand. The flat plate 2, the flat plate 3 on the palm and a plurality of connecting cylinders 4 are formed. The flat plate 3 on the palm is fixed on the upper end surface of the flat plate 2 under the palm through a plurality of connecting cylinders 4. The flat plate 3 on the palm is arranged in parallel with the flat plate 2 under the palm. The lower end of the lower plate 2 is fixed on the center of the upper end surface of the rotating base 8 through the central cylinder 7;

每个手指包括第一指节11、第二指节12、第一连接杆13、第二连接杆14、第一驱动杆15、第二驱动杆16、耦合连杆17和手指关节电机5,第二指节12的形状呈“L”形,每个旋转台20上安装有一个手指关节电机5,每个手指关节电机5的输出轴上固套有一个耦合连杆17,耦合连杆17的一端通过第一驱动杆15与第二指节12的短边末端连接,耦合连杆17的另一端通过第二驱动杆16与第一连接杆13的一端和第二连接杆14的一端连接,第一连接杆13的另一端与第二指节12连接,第二指节12的长边末端、第二连接杆14的另一端均与第一指节11连接;Each finger comprises a first knuckle 11, a second knuckle 12, a first connecting rod 13, a second connecting rod 14, a first driving rod 15, a second driving rod 16, a coupling connecting rod 17 and a finger joint motor 5, The shape of the second phalanx 12 is "L" shape, and a finger joint motor 5 is installed on each rotary table 20, and a coupling link 17 is fixedly sleeved on the output shaft of each finger joint motor 5, and the coupling link 17 One end of the coupling link 17 is connected with one end of the first connecting rod 13 and one end of the second connecting rod 14 through the second driving rod 16 with the short end of the second phalanx 12 through the first driving rod 15 , the other end of the first connecting rod 13 is connected with the second knuckle 12, the long side end of the second knuckle 12 and the other end of the second connecting rod 14 are connected with the first knuckle 11;

旋转底座8上均布设置有三个旋转轴21,每个旋转轴上固装有一个旋转台20,每个旋转台20上安装有一个大直齿轮22,每个手指底端电机6的输出轴与相应的一个蜗杆24固接,每个蜗杆24与相应的一个涡轮23相互啮合,每个涡轮23与相应的一个小直齿轮25同轴设置,每个小直齿轮25与相应的一个大直齿轮22相互啮合。Three rotating shafts 21 are evenly distributed on the rotating base 8, and a rotating table 20 is fixedly installed on each rotating shaft, and a large spur gear 22 is installed on each rotating table 20, and the output shaft of the motor 6 at the bottom of each finger Fixedly connected with a corresponding worm 24, each worm 24 meshes with a corresponding worm gear 23, each worm gear 23 is coaxially arranged with a corresponding small spur gear 25, and each small spur gear 25 is connected with a corresponding large straight gear The gears 22 mesh with each other.

如此设计,可以利用蜗轮蜗杆的自锁性能提高手爪的抓取稳定性。With such a design, the self-locking performance of the worm gear and worm can be used to improve the grasping stability of the gripper.

具体实施方式二:如图3所示,本实施方式所述旋转底座8包括上旋转平台8-1、下旋转平台8-2和三个轴承套筒8-3,上旋转平台8-1和下旋转平台8-2平行设置,三个轴承套筒8-3均布固装在上旋转平台8-1和下旋转平台8-2之间,每个轴承套筒8-3内安装有一个旋转轴21。如此设计,可以灵活的调整各个手指的指向,从而增加手爪构型多样性。其它组成及连接关系与具体实施方式一相同。Specific embodiment two: As shown in Figure 3, the rotating base 8 in this embodiment includes an upper rotating platform 8-1, a lower rotating platform 8-2 and three bearing sleeves 8-3, an upper rotating platform 8-1 and The lower rotating platform 8-2 is arranged in parallel, and three bearing sleeves 8-3 are evenly distributed and fixed between the upper rotating platform 8-1 and the lower rotating platform 8-2, and each bearing sleeve 8-3 is equipped with a Axis of rotation 21 . With such a design, the pointing of each finger can be flexibly adjusted, thereby increasing the diversity of claw configurations. Other components and connections are the same as those in the first embodiment.

具体实施方式三:如图2所示,本实施方式所述三指机械手爪还包括三个第一指节套件9,第一指节11上安装有一个第一指节套件9。如此设计,可以增加手指与物体接触时的摩擦力,保证抓取稳定性;并且能够避免手指与物体刚性接触时可能受到的表面磨损。其它组成及连接关系与具体实施方式一或二相同。Embodiment 3: As shown in FIG. 2 , the three-fingered robotic gripper in this embodiment further includes three first knuckle sets 9 , and one first knuckle set 9 is mounted on the first knuckle 11 . Such a design can increase the frictional force when the fingers are in contact with the object to ensure the stability of grasping; and can avoid the possible surface wear of the fingers when they are in rigid contact with the object. Other compositions and connections are the same as those in Embodiment 1 or 2.

具体实施方式四:如图2所示,本实施方式的所述三指机械手爪还包括三个第二指节套件10,第二指节12上安装有一个第二指节套件10。如此设计,可将外部受力均匀分布在第二指节12与第二指节套件10之间的受力端面上,提高抓取稳定性;也能够避免手指与物体刚性接触时可能受到的表面磨损。其它组成及连接关系与具体实施方式三相同。Embodiment 4: As shown in FIG. 2 , the three-fingered robotic gripper of this embodiment further includes three second knuckle sets 10 , and one second knuckle set 10 is installed on the second knuckles 12 . With such a design, the external force can be evenly distributed on the force-bearing end surface between the second knuckle 12 and the second knuckle set 10, improving the stability of grasping; it can also avoid the surface that may be affected by the finger when it is in rigid contact with the object. wear and tear. Other components and connections are the same as those in the third embodiment.

具体实施方式五:本实施方式的所述三指机械手爪还包括多个电位计,每个手指关节电机5和每个手指底端电机6上均设置有一个电位计。如此设计,能够检测手指关节电机5和每个手指底端电机6的旋转角度,从而实现手爪构型的精确控制。其它组成及连接关系与具体实施方式一、二或四相同。Embodiment 5: The three-finger robotic gripper in this embodiment further includes a plurality of potentiometers, and each finger joint motor 5 and each finger bottom motor 6 are provided with a potentiometer. Such a design can detect the rotation angles of the finger joint motor 5 and the bottom end motor 6 of each finger, thereby realizing precise control of the claw configuration. Other compositions and connections are the same as those in Embodiment 1, 2 or 4.

工作原理:working principle:

如图1~6所示,本发明的可变构型的三指机械手爪的三个手指均布设置在旋转底座8上,每个手指1的主体为单点固定的多连杆机构,每个手指1具有三个关节,手指底端电机6驱动涡轮蜗杆带动小直齿轮25旋转,小直齿轮25带动大直齿轮22旋转,可以转动旋转轴21带动手指旋转,从而调整手指1的指向,旋转到所需的角度后手指底端电机6将手指的位置锁定;As shown in Figures 1 to 6, the three fingers of the variable configuration three-finger gripper of the present invention are evenly distributed on the rotating base 8, and the main body of each finger 1 is a single-point fixed multi-link mechanism. A finger 1 has three joints. The motor 6 at the bottom of the finger drives the worm gear to drive the small spur gear 25 to rotate. The small spur gear 25 drives the large spur gear 22 to rotate. The rotating shaft 21 can be rotated to drive the finger to rotate, thereby adjusting the direction of the finger 1. After rotating to the required angle, the motor 6 at the bottom of the finger locks the position of the finger;

手指关节电机5带动耦合连杆17旋转,耦合连杆17旋转带动第一驱动杆15和第二驱动杆16控制手指1的伸展和弯曲;The finger joint motor 5 drives the coupling link 17 to rotate, and the coupling link 17 rotates to drive the first drive rod 15 and the second drive rod 16 to control the extension and bending of the finger 1;

即本发明的三个手指1的相对朝向可以进行调整,并且三个手指1之间不存在机构耦合。That is, the relative orientation of the three fingers 1 of the present invention can be adjusted, and there is no mechanical coupling between the three fingers 1 .

Claims (5)

1. three of a variable configuration refer to mechanical paw, described three refer to that mechanical paw comprises palm, rotating base (8), centered cylinder (7), three rotating shafts (21), three turntables (20), three fingers bottom motor (6), three turbines (23), three worm screws (24), three large straight gears (22), three small Spur gears (25) and three fingers (1), rotating base (8) is provided with three fingers (1), it is characterized in that: palm is by dull and stereotyped (2) under palm, palm upper flat plate (3) and multiple connecting cylinder (4) composition, palm upper flat plate (3) is packed on the upper surface of dull and stereotyped (2) under palm by multiple connecting cylinder (4), palm upper flat plate (3) be arranged in parallel with dull and stereotyped (2) under palm, under palm, the lower end of dull and stereotyped (2) is packed in rotating base (8) center, upper surface by centered cylinder (7),
Each finger comprises first knuckle (11), second knuckle (12), head rod (13), second connecting rod (14), first drive rod (15), second drive rod (16), coupled links (17) and finger-joint motor (5), the shape of second knuckle (12) is L-shaped, each turntable 20 is provided with a finger-joint motor 5, the output shaft of each finger-joint motor 5 is installed with a coupled links (17), one end of coupled links (17) is connected with the minor face end of second knuckle (12) by the first drive rod (15), the other end of coupled links (17) is connected with one end of head rod (13) and one end of the second connecting rod (14) by the second drive rod (16), the other end of head rod (13) is connected with second knuckle (12), the long edge tail of second knuckle (12), the other end of the second connecting rod (14) is all connected with first knuckle (11),
Rotating base (8) is above uniform is provided with three rotating shafts (21), each rotating shaft is fixed with a turntable (20), each turntable (20) is provided with a large straight gear (22), output shaft and corresponding worm screw (24) of each finger bottom motor (6) are affixed, each worm screw (24) and corresponding turbine (23) engage each other, each turbine (23) and corresponding small Spur gear (25) are coaxially arranged, each small Spur gear (25) and corresponding large straight gear (22) engage each other.
2. three of variable configuration according to claim 1 refer to mechanical paw, it is characterized in that: described rotating base (8) comprises rotation platform (8-1), lower rotation platform (8-2) and three bearing sleeves (8-3), upper rotation platform (8-1) and lower rotation platform (8-2) be arranged in parallel, three bearing sleeves (8-3) are uniform to be packed between rotation platform (8-1) and lower rotation platform (8-2), each bearing sleeve (8-3) is provided with a rotating shaft (21).
3. three of variable configuration according to claim 1 and 2 refer to mechanical paw, it is characterized in that: described three refer to that mechanical paw also comprises three first knuckle external members (9), first knuckle (11) are provided with a first knuckle external member (9).
4. three of variable configuration according to claim 3 refer to mechanical paw, it is characterized in that: described three refer to that mechanical paw also comprises three second knuckle external members (10), second knuckle (12) are provided with a second knuckle external member (10).
5. three of the variable configuration according to claim 1,2 or 4 refers to mechanical paw, it is characterized in that: described three refer to that mechanical paw also comprises multiple potentiometer, and each finger-joint motor (5) and each finger bottom motor (6) are provided with a potentiometer.
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