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基于PLC控制的三自由度气动机械手的设计【3自由度】【14张CAD图纸和说明书】

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关键词：: 14张CAD图纸和说明书基于PLC控制的三自由度气动机械手设计【 CAD图纸】基于PLC控制的三自由度气动机械手的设计【气动三自由度】【张CAD图纸基于PLC的机械手的设计【气动三自由度】

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摘要

在机械制造业中，机械手已被广泛应用，大大地改善了工人的劳动条件，显著地提高劳动生产率，加快了实现工业生产机械化和自动化的步伐。

本文通过对机械手的组成和分类，及国内外的发展状况的了解，对本课题任务进行了总体方案设计。确定了机械手用三自由度和圆柱坐标型式。设计了机械手的夹持式手部结构；以及设计了机械手的总体结构，以实现机械手伸缩，升降，回转三个自由度及手爪的开合。驱动方式由气缸来实现手臂伸缩和升降，异步电机来实现机械手的旋转。

运用了FX 系列可编程序控制器（PLC）对上下料机械手进行控制, 论述了电气控制系统的硬件设计, 控制软件结构以及手动控制程序和自动控制程序的设计。

关键词：机械手，气缸，可编程序控制器

Abstract

In mechanical manufacturing industry, manipulator has been applied extensively so that the labor condition of worker has been greatly improved , labor productivity raised notably, the step of industrial production mechanization and automation realized rapidly.

This article through to manipulator's composition and the classification, and the domestic and foreign development condition's understanding, has carried on the overall concept design to this topic duty. Had determined the manipulator uses three degrees-of-freedom and the circular cylindrical coordinate pattern. Has designed manipulator's clamp type hand structure; As well as has designed manipulator's gross structure, realizes the manipulator to expand and contract, the fluctuation, rotates three degrees-of-freedom and hand fingernail's opening and closing. The drive type realizes the arm expansion and the fluctuation by the air cylinder, the asynchronous machine realizes manipulator's revolving.

The paper illustrates that the control of the upper and lower material by means of the PLC and also includes the hardware design of the electric control system, the control software structure and the design of the manual and automatic control program.

Key words: manipulator, air cylinder, Programmable controller（PLC）

1 绪言 1

1.1 机械手的概述 1

1.2 我国机械手的发展 1

1.3 气动机械手的应用现状及发展前景 3

1.4 本课题设计要求 5

2 机械手的总体设计方案 7

2.1 机械手的系统工作原理及组成 7

2.2 机械手基本形式的选择 8

2.3 驱动机构的选择 9

2.4 机械手的技术参数列表 9

3 机械手的机械系统设计 11

3.1 机械手的运动概述 11

3.2 机器人的运动过程分析 12

4 机械手手部结构设计及计算 13

4.1 手部结构 13

4.2 手部结构设计及计算 14

4.3 夹紧气缸的设计 16

5 机械手手臂机构的设计 22

5.1 手臂的设计要求 22

5.2 伸缩气压缸的设计 22

5.3 导向装置 27

6 机械手腰部和基座结构设计及计算 29

6.1 结构设计 29

6.2 控制手臂上下移动的腰部气缸的设计 29

6.3 导向装置 33

6.4 平衡装置 33

6.5 基座结构设计 34

7 气动系统设计 37

7.1 气压传动系统工作原理图 37

8 机械手的PLC控制系统设计 39

8.1 可编程序控制器的选择及工作过程 39

8.2 可编程序控制器的使用步骤 40

8.3 机械手可编程序控制器控制方案 40

9 结论 52

参考文献 53

致谢 54

1 绪言

在工业生产线中，机械手具有很广泛的用途。它是工作抓取和装配系统中的一个重要组成部分。它的基本作用是从指定位置抓取工件运送到另一个指定的位置进行装配。机械手臂代替了人工的繁杂劳动，并且操作精度高，提高了产品质量和生产效率。

1.1 机械手的概述

机械手（又称机器人，机械人，英文名称：Robot），在人类科技发展史上其来有自。早在三国时代，诸葛亮发明的木牛流马即是古代中国人的智能结晶。随着近代的工业革命，机器产业的不断发展成为近代工业的主要支柱。由于科学幻想所系的“永动机”、太空探险以及梦想解决人的机能所无法达致境界的求新意念，推动科学家想研究创造出种种能够代替人的机械。上世纪六、七十年代的自动化机器、无人操纵的飞行器等等，即是此产业发展链条上的一个大胆的尝试与突破。虽然，后来电脑、电子产业的发达引开了人们关注的热点，但关于机械手的研究与开发一直在持续进行着。而近二十年中，因为电脑技术、电子产品及生物遗传工程等技术的大踏步发展，“机械手”的研发热潮已从专业人士的实验室中走了出来，成为一种综合科研能力的开发活动，参与者也打破了各行各业的划地为牢、各自为政的困局，开始了纵横连合，争奇斗妍，蔚成热潮的研究与制作尝试。

机械手的研究从一开始就是拟人化的，所以才有机械臂的开发与制作，也是为了以机械来代替人去做人力所无法完成的劳作或探险。但近十几年来，机械手的开发不仅越来越优化，而且涵盖了许多领域，应用的范畴十分广阔。大而言之，用之于太空开发，月球车，深海探测器，海洋石油开采，航天飞机机械臂等，小至微型手术机械，生命监测仪等。军事上的用途更是日新月异，从拆弹器、清除地雷器到无人驾驶飞机、战车，有人甚至预测未来战争可能如星球大战一样，是机械手的战争。至于工业、农业、遗传生物产业、医学、文化产业、电讯业、能源开发，都将因机械手的大量登场而出现产业革命。英国电讯公司未来学部门研究员曾因准确预测手机短讯、垃圾电邮及网上搜寻引擎的出现而闻名，在最近公布的科技展望五十年的预测中，其中就有数条是关于机械手的[1]。

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内容简介：: RobotAfter more than 40 years of development, since its first appearance till now, the robot has already been widely applied in every industrial fields, and it has become the important standard of industry modernization.Robotics is the comprehensive technologies that combine with mechanics, electronics, informatics and automatic control theory. The level of the robotic technology has already been regarded as the standard of weighing a national modern electronic-mechanical manufacturing technology.Over the past two decades, the robot has been introduced into industry to perform many monotonous and often unsafe operations. Because robots can perform certain basic more quickly and accurately than humans, they are being increasingly used in various manufacturing industries.With the maturation and broad application of net technology, the remote control technology of robot based on net becomes more and more popular in modern society. It employs the net resources in modern society which are already three to implement the operatio of robot over distance. It also creates many of new fields, such as remote experiment, remote surgery, and remote amusement. Whats more, in industry, it can have a beneficial impact upon the conversion of manufacturing means.The key words are reprogrammable and multipurpose because most single-purpose machines do not meet these two requirements. The term “reprogrammable” implies two things: The robot operates according to a written program, and this program can be rewritten to accommodate a variety of manufacturing tasks. The term “multipurpose” means that the robot can perform many different functions, depending on the program and tooling currently in use.Developed from actuating mechanism, industrial robot can imitation some actions and functions of human being, which can be used to moving all kinds of material components tools and so on, executing mission by execuatable program multifunction manipulator. It is extensive used in industry and agriculture production, astronavigation and military engineering.During the practical application of the industrial robot, the working efficiency and quality are important index of weighing the performance of the robot. It becomes key problems which need solving badly to raise the working efficiencies and reduce errors of industrial robot in operating actually. Time-optimal trajectory planning of robot is that optimize the path of robot according to performance guideline of minimum time of robot under all kinds of physical constraints, which can make the motion time of robot hand minimum between two points or along the special path. The purpose and practical meaning of this research lie enhance the work efficiency of robot.Due to its important role in theory and application, the motion planning of industrial robot has been given enough attention by researchers in the world. Many researchers have been investigated on the path planning for various objectives such as minimum time, minimum energy, and obstacle avoidance.The basic terminology of robotic systems is introduced in the following:A robot is a reprogrammable, multifunctional manipulator designed to move parts, materials, tools, or special devices through variable programmed motions for the performance of a variety of different task. This basic definition leads to other definitions, presented in the following paragraphs that give a complete picture of a robotic system.Preprogrammed locations are paths that the robot must follow to accomplish work. At some of these locations, the robot will stop and perform some operation, such as assembly of parts, spray painting, or welding. These preprogrammed locations are stored in the robots memory and are recalled later for continuous operation. Furthermore, these preprogrammed locations, as well as other programming feature, an industrial robot is very much like a computer, where data can be stored and later recalled and edited. The manipulator is the arm of the robot. It allows the robot to bend, reach, and twist. This movement is provided by the manipulators axes, also called the degrees of freedom of the robot. A robot can have from 3 to 16 axes. The term degrees of freedom will always relate to the number of axes found on a robot.The tooling and grippers are not part of the robotic system itself: rather, they are attachments that fit on the end of the robots arm. These attachments connected to the end of the robots arm allow the robot to lift parts, spot-weld, paint, arc-well, drill, deburr, and do a variety of tasks, depending on what is required of the robot.The robotic system can also control the work cell of the operating robot. The work cell of the robot is the total environment in which the robot must perform its task. Included within this cell may be the controller, the robot manipulator, a work table, safety features, or a conveyor. All the equipment that is required in order for the robot to do its job is included in the work cell. In addition, signals from outside devices can communicate with the robot in order to tell the robot when it should assemble parts, pick up parts, or unload parts to a conveyor.The robotic system has three basic components: the manipulator, the controller, and the power source. ManipulatorThe manipulator, which dose the physical work of the robotic system, consists of two sections: the mechanical section and the attached appendage. The manipulator also has a base to which the appendages are attached.The base of the manipulator is usually fixed to the floor of the work area. Sometimes, though, the base may be movable. In this case, the base is attached to either a rail or a track, allowing the manipulator to be moved from one location to anther.As mentioned previously, the appendage extends from the base of the robot. The appendage is the arm of the robot. It can be either a straight, movable arm or a jointed arm. The jointed arm is also known as an articulated arm.The appendages of the robot manipulator give the manipulator its various axes of motion. These axes are attached to a fixed base, which, in turn, is secured to a mounting. This mounting ensures that the manipulator will remain in one location.At the end of the arm, a wrist is connected. The wrist is made up of additional axes and a wrist flange. The wrist flange allows the robot user to connect different tooling to the wrist for different jobs.The manipulators axes allow it to perform work within a certain area. This area is called the work cell of the robot, and its size corresponds to the size of the manipulator. As the robots physical size increases, the size of the work cell must also increase.The movement of the manipulator is controlled by actuators, or drive system. The actuator, or drive system, allows the various axes to move within the work cell. The drive system can use electric, hydraulic, or pneumatic power. The energy developed by the drive system is converted to mechanical power by various mechanical drive systems. The drive systems are coupled through mechanical linkages. These linkages, in turn, drive the different axes of the robot. The mechanical linkages may be composed of chains, gears, and ball screws.ControllerThe controller in the robotic system is the heart of the operation. The controller stores preprogrammed information for later recall, controls peripheral devices, and communicates with computers within the plant for constant updates in production.The controller is used to control the robot manipulators movements as well as to control peripheral components within the work cell. The user can program the movements of the manipulator into the controller through the use of a hand-held teach pendant. This information is stored in the memory of the controller for later recall. The controller stores all program data for the robotic system. It can store several different programs, and any of these programs can be edited.The controller is also required to communicate with peripheral equipment within the work cell. For example, the controller has an input line that identifies when a machining operation is completed. When the machine cycle is completed, the input line turns on, telling the controller to position the manipulator so that it can pick up the finished part. Then, a new part is picked up by the manipulator and placed into the machine. Next, the controller signals the machine to start operation.The controller can be made from mechanically operated drums that step through a sequence of events. This type of controller operates with a very simple robotic system. The controllers found on the majority of robotic systems are more complex devices and represent state-of-the-art electronics. This is, they are microprocessor-operated. These microprocessors are either 8-bit, 16-bit, or 32-bit processors. This power allows the controller to the very flexible in its operation.The controller can send electric signals over communication lines that allow it to talk with the various axes of the manipulator. This two-way communication between the robot manipulator and the controller maintains a constant update of the location and the operation of the system. The controller also controls any tooling placed on the end of the robots wrist.The controller also has the job of communicating with the different plant computers. The communication link establishes the robot as part of a computer-assisted manufacturing (CAM) system.As the basic definition stated, the robot is a reprogrammable, multifunctional manipulator. Therefore, the controller must contain some type of memory storage. The microprocessor-based systems operate in conjunction with solid-state memory devices. These memory devices may be magnetic bubbles, random-access memory, floppy disks, or magnetic tape. Each memory storage device stores program information for later recall or for editing.Power supplyThe power supply is the unit that supplies power to the controller and the manipulator. Two types of power are delivered to the robotic system. One type of power is the AC power for operation of the controller. The other type of power is used for driving the various axes of the manipulator. For example, if the robot manipulator is controlled by hydraulic or pneumatic drives, control signals are sent to these devices, causing motion of the robot.For each robotic system, power is required to operate the manipulator. This power can be developed from either a hydraulic power source, a pneumatic power source, or an electric power source. These power sources are part of the total components of the robotic work cell.Classification of RobotsIndustrial robots vary widely in size, shape, number of axes, degrees of freedom, and design configuration. Each factor influences the dimensions of the robots working envelope or the volume of space within which it can move and perform its designated task. A broader classification of robots can been described as blew. Fixed and Variable-Sequence Robots. The fixed-sequence robot (also called a pick-and place robot) is programmed for a specific sequence of operations. Its movements are from point to point, and the cycle is repeated continuously. The variable-sequence robot can be programmed for a specific sequence of operations but can be reprogrammed to perform another sequence of operation.Playback Robot. An operator leads or walks the playback robot and its end effector through the desired path. The robot memorizes and records the path and sequence of motions and can repeat them continually without any further action or guidance by the operator.Numerically Controlled Robot. The numerically controlled robot is programmed and operated much like a numerically controlled machine. The robot is servo-controlled by digital data, and its sequence of movements can be changed with relative ease.Intelligent Robot. The intellingent robot is capable of performing some of the functions and tasks carried out by human beings. It is equipped with a variety of sensors with visual and tactile capabilities.Robot ApplicationsThe robot is a very special type of production tool; as a result, the applications in which robots are used are quite broad. These applications can be grouped into three categories: material processing, material handling and assembly.In material processing, robots use to process the raw material. For example, the robot tools could include a drill and the robot would be able to perform drilling operations on raw material.Material handling consists of the loading, unloading, and transferring of workpieces in manufacturing facilities. These operations can be performed reliably and repeatedly with robots, thereby improving quality and reducing scrap losses.Assembly is another large application area for using robotics. An automatic assembly system can incorporate automatic testing, robot automation and mechanical handling for reducing labor costs, increasing output and eliminating manual handling concerns.Hydraulic SystemThere are only three basic methods of transmitting power: electrical, mechanical, and fluid power. Most applications actually use a combination of the three methods to obtain the most efficient overall system. To properly determine which principle method to use, it is important to know the salient features of each type. For example, fluid systems can transmit power more economically over greater distances than can mechanical type. However, fluid systems are restricted to shorter distances than are electrical systems.Hydraulic power transmission systems are concerned with the generation, modulation, and control of pressure and flow, and in general such systems include:1. Pumps which convert available power from the prime mover to hydraulic power at the actuator.2. Valves which control the direction of pump-flow, the level of power produced, and the amount of fluid-flow to the actuators. The power level is determined by controlling both the flow and pressure level.3. Actuators which convert hydraulic power to usable mechanical power output at the point required.4. The medium, which is a liquid, provides rigid transmission and control as well as lubrication of components, sealing in valves, and cooling of the system.5. Connectors which link the various system components, provide power conductors for the fluid under pressure, and fluid flow return to tank(reservoir).6. Fluid storage and conditioning equipment which ensure sufficient quality and quantity as well as cooling of the fluid.Hydraulic systems are used in industrial applications such as stamping presses, steel mills, and general manufacturing, agricultural machines, mining industry, aviation, space technology, deep-sea exploration, transportation, marine technology, and offshore gas and petroleum exploration. In short, very few people get through a day of their lives without somehow benefiting from the technology of hydraulics.The secret of hydraulic systems success and widespread use is its versatility and manageability. Fluid power is not hindered by the geometry of the machine as is the case in mechanical systems. Also, power can be transmitted in almost limitless quantities because fluid systems are not so limited by the physical limitations of materials as are the electrical systems. For example, the performance of an electromagnet is limited by the saturation limit of steel. On the other hand, the power limit of fluid systems is limited only by the strength capacity of the material.Industry is going to depend more and more on automation in order to increase productivity. This includes remote and direct control of production operations, manufacturing processes, and materials handling. Fluid power is the muscle of automation because of advantages in the following four major categories.1. Ease and accuracy of control. By the use of simple levers and push buttons, the operator of a fluid power system can readily start, stop, speed up or slow down, and position forces which provide any desired horsepower with tolerances as precise as one ten-thousandth of an inch. Fig. shows a fluid power system which allows an aircraft pilot to raise and lower his landing gear. When the pilot moves a small control valve in one direction, oil under pressure flows to one end of the cylinder to lower the landing gear. To retract the landing gear, the pilot moves the valve lever in the opposite direction, allowing oil to flow into the other end of the cylinder.2. Multiplication of force. A fluid power system (without using cumbersome gears, pulleys, and levers) can multiply forces simply and efficiently from a fraction of an ounce to several hundred tons of output.3. Constant force or torque. Only fluid power systems are capable of providing constant force or torque regardless of speed changes. This is accomplished whether the work output moves a few inches per hour, several hundred inches per minute, a few revolutions per hour, or thousands of revolutions per minute.4. Simplicity, safety, economy. In general, fluid power systems use fewer moving parts than comparable mechanical or electrical systems. Thus, they are simpler to maintain and operate. This, in turn, maximizes safety, compactness, and reliability. For example, a new power steering control designed has made all other kinds of power systems obsolete on many off-highway vehicles. The steering unit consists of a manually operated directional control valve and meter in a single body. Because the steering unit is fully fluid-linked, mechanical linkages, universal joints, bearings, reduction gears, etc. are eliminated. This provides a simple, compact system. In applications. This is important where limitations of control space require a small steering wheel and it becomes necessary to reduce operator fatigue.Additional benefits of fluid power systems include instantly reversible motion, automatic protection against overloads, and infinitely variable speed control. Fluid power systems also have the highest horsepower per weight ratio of any known power source. In spite of all these highly desirable features of fluid power, it is not a panacea for all power transmission problems. Hydraulic systems also have some drawbacks. Hydraulic oils are messy, and leakage is impossible to completely eliminate. Also, most hydraulic oils can cause fires if an oil leak occurs in an area of hot equipment.Pneumatic SystemPneumatic system use pressurized gases to transmit and control power. As the name implies, pneumatic systems typically use air (rather than some other gas ) as the fluid medium because air is a safe, low-cost, and readily available fluid. It is particularly safe in environments where an electrical spark could ignite leaks from system components.In pneumatic systems, compressors are used to compress and supply the necessary quantities of air. Compressors are typically of the piston, vane or screw type. Basically a compressor increases the pressure of a gas by reducing its volume as described by the perfect gas laws. Pneumatic systems normally use a large centralized air compressor which is considered to be an infinite air source similar to an electrical system where you merely plug into an electrical outlet for electricity. In this way, pressurized air can be piped from one source to various locations throughout an entire industrial plant. The compressed air is piped to each circuit through an air filter to remove contaminants which might harm the closely fitting parts of pneumatic components such as valve and cylinders. The air then flows through a pressure regulator which reduces the pressure to the desired level for the particular circuit application. Because air is not a good lubricant (contains about 20% oxygen), pneumatics systems required a lubricator to inject a very fine mist of oil into the air discharging from the pressure regulator. This prevents wear of the closely fitting moving parts of pneumatic components.Free air from the atmosphere contains varying amounts of moisture. This moisture can be harmful in that it can wash away lubricants and thus cause excessive wear and corrosion. Hence, in some applications, air driers are needed to remove this undesirable moisture. Since pneumatic systems exhaust directly into the atmosphere , they are capable of generating excessive noise. Therefore, mufflers are mounted on exhaust ports of air valves and actuators to reduce noise and prevent operating personnel from possible injury resulting not only from exposure to noise but also from high-speed airborne particles.There are several reasons for considering the use of pneumatic systems instead of hydraulic systems. Liquids exhibit greater inertia than do gases. Therefore, in hydraulic systems the weight of oil is a potential problem when accelerating and decelerating and decelerating actuators and when suddenly opening and closing valves. Due to Newtons law of motion ( force equals mass multiplied by acceleration ), the force required to accelerate oil is many times greater than that required to accelerate an equal volume of air. Liquids also exhibit greater viscosity than do gases. This results in larger frictional pressure and power losses. Also, since hydraulic systems use a fluid foreign to the atmosphere , they require special reservoirs and no-leak system designs. Pneumatic systems use air which is exhausted directly back into the surrounding environment. Generally speaking, pneumatic systems are less expensive than hydraulic systems.However, because of the compressibility of air, it is impossible to obtain precise controlled actuator velocities with pneumatic systems. Also, precise positioning control is not obtainable. While pneumatic pressures are quite low due to compressor design limitations ( less than 250 psi ), hydraulic pressures can be as high as 10,000 psi. Thus, hydraulics can be high-power systems, whereas pneumatics are confined to low-power applications. Industrial applications of pneumatic systems are growing at a rapid pace. Typical examples include stamping, drilling, hoist, punching, clamping, assembling, riveting, materials handling, and logic controlling operations.工业机器人机器人自问世以来到现在，经过了40多年的发展，已被广泛应用于各个工业领域，已成为工业现代化的重要标志。机器人技术是一门机械、电子、自动控制理论及信息技术有机结合起来的综合性工程技术。机器人技术发展水平己成为衡量一个国家现代机电制造技术的标准。经过过去20年的发展，机器人已经进入到工厂来完成许多单调的和不安全的操作任务。因为机器人可以比人更快更准确地完成某些基本任务，所以机器人正在大量地应用于各种制造企业。随着网络技术的成熟和广泛应用，机器人网络远程控制技术在现代社会中有了越来越大的应用空间。它充分利用已在现代社会中广泛存在的网路设施实现机器人操作者和机器人之间的远距离交互。它开辟了远程实验、远程医疗和远程娱乐等诸多崭新的应用领域。机器人网络远程控制技术在工业领域的应用还能在推进企业信息化和实现企业生产方式的转变的进程中发挥重要作用。机器人的主要优点在于可重复编程和多功能性，因为大多数功能单一的机器不能满足这两种要求。“可重复编程”包含两层含义：机器人根据已设定的程序运转，并且这个程序可以被重写以适应多种制造任务。“多功能”意味着机器人可以拥有多种不同的功能，这依赖于当前正在使用的程序和工具。工业机器人是在自动操作机基础上发展起来的一种能模仿人的某些动作和功能，可以用于移动各种材料、零件、工具等，通过可编程序动作来执行各种任务的，并具有编程能力的多功能机械手。它综合了精密机械，控制传感和自动控制技术等领域的最新成果，并广泛应到工农业生产、航天航空和军事等领域。在工业机器人的实际应用中，工作效率和质量是衡量机器人性能的重要指标，提高工业机器人的工作效率，减小实际操作中的误差成为工业机器人应用亚需解决的关键性问题。机器人的时间最优轨迹规划是指以时间最短作为性能指标并在满足各种约束的条件下优化机器人的运动轨迹，使机器人手部在两点之间或沿着规定轨迹运动的时间最短，进行这项研究的目的和实际意义在于提高工业机器人的工作效率。工业机器人是机器人家族中的一个重要分支，是机器人领域的重要研究发展方向。因此，对工业机器人运动路径规划的研究，一直受到人们的普遍关注。基于最少时间、最少能量和避障等的不同目标，许多研究学者对路径规划问题进行了探索如下叙述的是机器人系统基本术语：机器人是一个可编程、多功能的机械手，通过给要完成的不同任务编制各动作，它可以移动零件、材料、工具以及特殊装置。这个基本定义引导出后续段落的其他定义，从而描绘出一个完整的机器人系统。预编程位置点是机器人为完成工作而必须跟踪的轨迹。在某些位置点上机器人将停下来做某些操作，如装配零件、喷涂油漆或焊接。这些预编程点储存在机器人的储存器中，并为后续的连续操作所调用，而且这些预编程点像其他程序数据一样，可在日后随工作需要而变化。因而，正是这种可编程的特征，一个工业机器人很像一台计算机，数据可在这里储存、后续调用与编辑。机械手是机器人的手臂，它使机器人能弯曲、延伸和旋转，提供这些运动的是机械手的轴，亦是所谓的机械人的自由度。一个机械人能有3至16轴，自由度一词总是与机器人轴数相关。这些连在机器人手臂末端的附件可使机器人抬起工件、点焊、刷漆、电弧焊、钻孔、打毛刺以及根据机器人的要求去做各种各样的工作。机器人系统还可以控制机器人的工作单元，工作单元是机器人执行任务所处的整体环境，该单元包括控制器、机械手、工作平台、安全保护装置或者传输装置。所有这些为保证机器人完成自己任务而必须的装置都包括在这一工作单元中。另外，来自外设的信号与机器人通讯，通知机器人何时装配工件、取工件或放工件到传输装置上。工具和手爪不是机器人自身组成部分，但它们是安装在机器人手臂末端的附件。机器人系统有三个基本部件：机械手、控制器和动力源。机械手机械手做机器人系统中粗重工作，它包括两个部分：机构和构件，机械手也有联接附件基座。机械手基座通常固定在工作区域的地基上，有时基座也可以移动，在这种情况下基座安装在导轨或轨道上，允许机械手从一个位置移到另外一个位置。正如前面所提到的那样，附件从机器人基座上延伸出来，附件就是机器人的手臂，它可以是直动型，也可以是轴节型手臂，轴节型手臂也是大家所知的关节型手臂。机械臂使机械手产生各轴的运动。这些轴连在一个安装基座上，然后再连到拖架上，拖架确保机械手停留在某一位置。在手臂的末端上，连接着手腕，手腕由辅助轴和手腕凸缘组成，手腕是机器人用户在手腕凸缘上安装不同工具来做不同种工作。机械手的轴使机械手在某一区域内执行任务，我们将这个区域成为机器人的工作单元，该区域的大小与机械手的尺寸相对应。随着机器人的机械结构尺寸的增加，工作单元的范围也必须相应增加。机械手的运动由执行元件或驱动系统来控制。执行元件或驱动系统允许各轴在工作单元内驱动。驱动系统可用电气、液压和气压动力，驱动系统所产生的动力机构转变为机械能，驱动系统与机械传动链相匹配。由链、齿轮和滚珠丝杠组成的机械传动链驱动着机器人的各轴。控制器机器人控制器是工作单元的核心。控制器储存着预编程序供后续调用、控制外设，及与厂内计算机进行通讯以满足产品经常更新的需要。控制器用于控制机械手运动和在工作单元内控制机器人外设。用户可通过手持的示教盒将机械手运动的程序编入控制器。这些信息储存在控制器的存储器中以备后续调用，控制器储存了机器人系统的所有编程数据，它能储存几个不同的程序，并且所有这些程序均能编辑。控制器要求能够在工作单元内与外设进行通信。例如控制器有一个输入端，它能标识某个机加工操作何时完成。当该加工循环完成后，输入端接通，告诉控制器定位机械手以便能抓取已加工工件，随后，机械手抓取一未加工件，将其放置在机床上。接着，控制器给机床发出开始加工的信号。控制器可以由根据时间顺序而步进的机械式轮鼓组成，这种类型的控制器可用在非常简单的机械系统中。用于大多数机器人系统中的控制器代表现代电子学的水平，是更复杂的装置，即它们是由微处理器操纵的，这些微处理器可以是8位，16位或36位处理器。它们可以使得控制器在操作过程中显得非常柔性。控制器能通过通信线发送电信号，使他能与机械手各轴交流信息，在机器人的机械手和控制器之间的双向交流信息可以保持系统操作和位子经常更新，控制器也能年控制安装在机器人手腕上的任何工具。控制器也有与厂内各计算机进行通信的任务，这种通信联系使机器人成为计算机辅助制造（CAM）系统的一个组成部分。存储器。基于处理器的系统运行时要与固态的存储装置相连，这些存储装置可以是磁泡，随机存储器、软盘、磁带等。每种记忆存储装置均能储存、编辑信息以备后续调用和编辑。动力源动力源是个机器人和机械手提供动力的单元。传给机器人系统的动力源有两种，一种是用于控制器的交流电，另一种是用于驱动机械手各轴的动力源，例如，如果机器人的机械手是由液压和气压驱动的，控制信号便传送到这些装置中，驱动机器人运动。对于每一个机器人系统，动力源是用来操纵机械手的。这些动力可来源于液压动力源、气压动力源或电源，这些能源是机器人工作单元整体的一部分。机器人的分类工业机器人在尺寸、形状、坐标数量、自由度和设计构造上都多种多样。每个因素都影响着机器人的工作范围或它能够运动和执行指定任务的空间区域。广义的机器人分类如下所述。固定顺序和可变顺序的机器人。固定顺序机器人（也称为拾取和定位机器人）是为完成

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