WO2008141483A1 - Procédé de support exécutif à pression électrique et cylindre de support électrique de précision - Google Patents

Procédé de support exécutif à pression électrique et cylindre de support électrique de précision Download PDF

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Publication number
WO2008141483A1
WO2008141483A1 PCT/CN2007/001763 CN2007001763W WO2008141483A1 WO 2008141483 A1 WO2008141483 A1 WO 2008141483A1 CN 2007001763 W CN2007001763 W CN 2007001763W WO 2008141483 A1 WO2008141483 A1 WO 2008141483A1
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WIPO (PCT)
Prior art keywords
electric
support
motor
control circuit
support rod
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Application number
PCT/CN2007/001763
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English (en)
French (fr)
Inventor
Yu Jiang
Original Assignee
Yu Jiang
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Publication date
Application filed by Yu Jiang filed Critical Yu Jiang
Publication of WO2008141483A1 publication Critical patent/WO2008141483A1/zh

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
    • B66F3/44—Devices, e.g. jacks, adapted for uninterrupted lifting of loads with self-contained electric driving motors

Definitions

  • the invention relates to an electric pressure execution supporting method and a precision electric supporting cylinder, in particular to a mechanical supporting tooling technical field, an electric supporting cylinder, a thrust cylinder, a pulling cylinder, a rotating cylinder, a connecting rod pressing cylinder, etc., belonging to a machining tooling Equipment technology field.
  • the support type tooling equipment supporting cylinder used in the machining process is basically a spring-out type; an air-out type; a hydraulic top-out type. Thrust cylinders, tension cylinders, rotary cylinders, and connecting rod compression cylinders currently do not have an electric structure.
  • the known patent CN2425226, an improved hydraulic floating support cylinder, is also a structural improvement of the hydraulic push-out type support cylinder.
  • the hydraulic support cylinder mainly has the following deficiencies and defects: (1) Because the hydraulic support cylinder needs to be equipped with a hydraulic pump, oil pump, fuel tank, various control valves, multiple oil pipes, multiple joints, complicated pipelines, etc. The control system leads to many fault points, and there are multiple leak points, which pollute the working environment and are not safe. (2) The position of the working support of the hydraulic support cylinder is sometimes inaccurate. Insufficient tightening. Sometimes the clamping stops when there is no support in place, whether it can be confirmed by normal operation; additional auxiliary electric signal device is needed in the automatic production; (3) The locking mechanism often fails, causing the supporting head to not hold the workpiece and not participate in the work; (4) Due to the limitation of the oil pipeline, the working site is limited, and it is not free to move. The use area is large, and the installation work is inconvenient; (5) The processing cost is high.
  • Air ejector type support cylinders mainly have the following deficiencies and defects: (1) due to air
  • the spring-ejection type also has a position in which the working head of the supporting cylinder stops operating, which is sometimes inaccurate. Insufficient tightening. Sometimes the clamping stops when there is no support in place, and it is impossible to confirm whether it works normally. In the automated production, an auxiliary electrical signal device is additionally required. As well as the locking mechanism often fails, resulting in defects such as the support can not stand on the workpiece and not participate in work.
  • the invention discloses an electric pressure execution supporting method, which solves the defects that the existing oil pressure workpiece supporting cylinder oil passage has complicated structure, high production cost, poor control precision, large failure rate and poor safety.
  • the present invention also provides a precision electric support cylinder suitable for use in the above method for actual production.
  • the technical solution of the present invention is as follows:
  • the support cylinder body is a cavity structure, and the cavity is divided into upper and lower sections, and a support rod and an electric lifter assembly that can move up and down are provided, and a support rod and an electric lifting device are arranged between the support rod and the electric lifting device. Travel clearance.
  • the two ends of the gap, that is, the bottom of the support rod and the top of the electric lifter are respectively provided with switch contacts, which constitute a control circuit switch of the electric lifter, and the gap between the support rod and the electric lifter is changed until the gap is changed until In contact with each other, the control circuit of the electric lifter is turned on, so that the lifter assembly stops moving.
  • motor current to vary with the load when the support head is in contact with the workpiece, and control the motor control circuit to open, that is, to control the start and stop of the motor by collecting the change of the motor current.
  • the electric support cylinder includes a cylinder block, an upper cover, a base, a support rod, a support head, a guide rod, and a switch contact, an electrode set screw, a friction clutch, a screw, a nut, a reducer, a reducer seat, and an upper limit position.
  • the support cylinder body has a cylindrical structure, and the upper and lower ends are respectively provided with a top cover and a base, and the center of the top cover is provided with a central hole, and the support rod is set to move up and down in the bobbin of the body, and the upper end is a support head.
  • a reducer bracket extending from the center hole of the top cover for contacting the workpiece, the base is fixed with an electric lifting device, a DC motor is arranged in the reducer bracket, and the DC motor and the reducer are assembled in a shaft type, and the speed reducer is assembled
  • the output shaft head is provided with a hollow wire head, which together constitute a linkage mechanism, and the silk core and the silk core of the outer casing constitute a thread pair which can move up and down, and the upper end of the nut is fixedly connected with the switch contact through the insulating pad to form a switch of the control circuit of the DC motor.
  • the electrode positioning screw is connected between the nut and the support rod to form a circuit of the control circuit of the DC motor.
  • the hollow end of the wire head is provided with a friction clutch, and the clutch is sleeved with a support spring, and the lower end of the support contact point and the support rod are 0.1.
  • the gap above mm makes the switch of the DC motor control circuit open.
  • an electric lifting device as a mechanical support mechanism eliminates the need to install complex oil pressure control systems such as oil pipes, hydraulic sources, control valves and oil pipes, and has a non-contaminating working environment, a simple structure, and a volume.
  • an electric support cylinder instead of a hydraulic support cylinder, the same volume of electric support cylinder can be obtained larger than the hydraulic support cylinder 2 3 times the support force, improving work efficiency.
  • the electric support cylinder automatic control system can provide accurate working signals, easy to control accurately, and is suitable for more accurate and precise automation systems and single-piece batch precision machining; it is beneficial to improve the automation control of the production line; it is more favorable and reliable for the safety of the system.
  • the accuracy and reliability of the support to the fulcrum height can provide accurate working signals, easy to control accurately, and is suitable for more accurate and precise automation systems and single-piece batch precision machining; it is beneficial to improve the automation control of the production line; it is more favorable and reliable for the safety of the system. The accuracy and reliability of the support to the fulcrum height
  • the support is flexible, the installation is convenient, the accuracy and reliability from the support to the support point height is improved, the precise control is easy, and it is suitable for more accurate and precise automation systems and single-piece batch precision machining; Improve the automation of the production line;
  • FIG. 1 is a schematic structural view of an electric support cylinder according to Embodiment 1 of the present invention.
  • Fig. 2 is a schematic view showing the structure of a friction clutch according to a first embodiment of the present invention.
  • FIG. 3 is a schematic structural view of an electric support cylinder according to Embodiment 2 of the present invention.
  • the support cylinder body 6 has a cylindrical structure, and the upper and lower ends are respectively provided with a top cover 9 and a base 7 , and a center hole is opened in the center of the top cover 9 , and the support rod 1 is set on the body 6 .
  • the upper end of the bobbin can be moved up and down, and the upper end of the support head 8 protrudes from the central hole of the top cover 9 for contact with the workpiece, the base 7 is fixed with a reducer bracket 5, and the reducer bracket 5 is provided with a DC motor 16, DC
  • the motor 16 and the speed reducer 13 are assembled in a shaft type, and the output shaft head of the speed reducer 13 is mounted with a hollow wire head 12, which together constitute a linkage mechanism, and the wire head 12 and the wire core 4 of the outer casing constitute a thread pair which can move up and down, the silk mother
  • the upper end of 4 is fixedly connected with the switch contact 2 through an insulating pad to form a switch of the control circuit of the DC motor 16, and the electrode set screw 11 is connected between the nut 4 and the support rod 1 to form a circuit of the control circuit of the DC motor 16.
  • a friction clutch 3 is disposed in the hollow of the wire head 12, and a support spring is sleeved on the clutch 3.
  • the switch contact 2 has a gap of 0.5 mm or more with the lower end of the support rod 1, so that the switch of the DC motor 16 control circuit is opened.
  • the motor 16 drives the speed reducer 13 to rotate to drive the wire head 12 to rotate, and the wire head 12 drives the wire core 4 for lifting movement, that is, the screw pair transmission.
  • the support rod 1 stops moving upward, and the nut 4 drives the switch contact 2 to continue to rise until the gap between the switch contact 2 and the support rod 1 is eliminated, the switch contact 2 contact with the support rod 1, the control circuit is turned on, the motor 16 is powered off, and the components stop moving.
  • the workpiece transmits the force to the support rod 1 - the switch contact 2 - the nut 4 - the wire head 12 ⁇ the reducer bracket 5—Base 7—The workbench completes the support work.
  • the DC motor 16 is reversed after being removed, and the support rod 1 is returned to the original position to complete a work cycle.
  • a friction clutch 3 (refer to FIG. 2) is disposed between the wire head 12 and the speed reducer 13, and the corresponding reducer bracket 5 is provided with upper and lower limit switches 14, 15 through the adjusting screw 17 and the adjusting wire.
  • the up and down movement of the mother 18 is combined with the control circuit to form a control switch in parallel.
  • the friction clutch is mounted in the recess of the wire head, and two steel circular friction plates 24 and 26 are supported by a spring, wherein one friction plate 26 is in contact with the lower surface of the concave hole, and the other friction plate 24 is at the shaft of the reducer.
  • the end is blocked by the spring retaining ring 23, the inner hole of the wire head 12 and the reducer shaft head are gap-fitted, and there is no key connection.
  • the friction plate is supported by the spring, and the torque of the reducer shaft head 22 is transmitted to the wire head 12 for work.
  • the reducer idles.
  • the precision electric control stroke support cylinder is assembled by using a motor 16 and a reducer 13 in a shaft type, and the output shaft of the reducer 13 is provided with a wire head 12.
  • the motor 16 drives the speed reducer 13 to rotate to drive the wire head 12 to rotate.
  • the wire head 12 drives the wire mother 4 to perform the lifting movement according to the guide pin 20. That is, the screw drive.
  • the upper end of the nut 4 is provided with a support rod 1 and drives the support rod 1 and the sliding varistor 19 for lifting movement.
  • the sliding varistor 19 is mounted on the lower end of the nut 4, the reducer seat 5 is machined with a transverse groove, and the sliding head of the sliding varistor 19 is inserted.
  • the position of the support head 8 is judged, and the stroke of the support head 8 is displayed in real time on the digital tube.
  • the upper limit 14 and the lower limit 15 of the motor 16 are soft limits.
  • the workpiece will transmit force to the support head 8 - support rod 1 - silk mother 4 - silk head 12 - reducer seat 5 - base 7 - the workbench completes the control stroke support and distance test work.
  • the motor 16 is reversed and the support rod 1 is returned to the home position, that is, one duty cycle is completed.
  • 001 ⁇ The stroke of the support head 8 can be adjusted according to the needs of the work, the stroke accuracy can reach 0. 001mm.
  • the supporting force can reach 2N or more.
  • the supporting force can reach tens or even hundreds of tons according to design requirements.
  • the system is protected by dual electrical appliances. That is, first, by dynamically reading the voltage setting value of the sliding varistor 19, when the sliding varistor system fails, the upper limit switch 14 and the lower limit switch 15 operate.
  • This system is a combination of multi-function, that is, positioning function, stroke display function (distance test) and supporting workpiece rising function (supporting force can be tens or even hundreds of tons according to design requirements when stopping. It can be adjusted from 0. 2N to the required supporting force as needed.
  • This lifting support can be designed as needed).
  • the motor 16 can be a micro DC motor or a micro servo motor. It can also be a stepping motor control system. The accuracy of the servo motor control is higher, but the manufacturing cost of the servo motor is high.
  • the system can also use the current overload mode to control the rise of the support rod.
  • the specific working principle is as follows: When the motor 16 is operated, when the support head 8 at the upper end of the support rod 1 is in contact with the workpiece, the load of the motor 16 is increased, and the current of the motor 16 is increased. As a result, when the current reaches the set value, the control circuit is turned on, the motor 16 is powered off, and the components stop moving, that is, the start and stop of the motor is controlled by collecting the change state of the motor current.
  • the thrust cylinder, the tension cylinder, the rotary cylinder, and the connecting rod compression cylinder of the fixture assembly are also basically the same as the principle of the electric support.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Description

一种电动压力执行支撑方法及精密电动支撑缸 技术领域
本发明涉及一种电动压力执行支撑方法及精密电动支撑缸，特别 涉及一种机械加工工装设备技术领域电动支撑缸、 推力缸， 拉力缸， 旋转缸， 连杆压紧缸等， 属于机械加工工装设备技术领域。
背景技术：
目前， 在机械加工过程中使用的支撑类工装设备支撑缸，基本为 弹簧顶出型； 空气顶出型； 油压顶出型三种型式。 推力缸， 拉力缸， 旋转缸， 连杆压紧缸目前也没有电动结构。
已知的专利 CN2425226,改良的油压浮动支撑缸，也是油压顶出 型支撑缸的一种结构改进。
油压支撑缸主要存在以下不足和缺陷： ( 1 )由于油压支撑缸需配 备液压源、 油泵、 油箱、 各种控制阀、 多条油管、 多个接头、 管路复 杂等复杂的全套液压工作控制系统，导致故障点多，存在多个泄漏点， 既污染工作环境， 又不安全； （2)油压支撑缸的工作支头运行停止的 位置有时不准确。加紧力不足。 有时没支撑到位就夹紧停止， 是否正 常工作无法确认；自动化生产中需要另外配备辅助的电信号装置； (3 ) 锁紧机构经常失灵， 导致支头顶不住工件而不参与工作； （4) 由于接 油管路的存在限制了工作场地， 不能自由移动， 使用面积面积大， 安 装工作不方便； （5 ) 加工制作成本高。
空气顶出型支撑缸主要存在以下不足和缺陷： （ 1 ) 由于空气的
确 认 本 可压縮性大， 难以保证加工部件时的工作稳定性； （ 2 ) 与同体积的 油压支撑缸相比支撑力度小； （3 )有时没支撑到位就夹紧停止， 是否 正常工作无法确认； （4)需要复杂的工作控制系统， 故障点多， 安装 不便， 多个接头， 存在多个泄漏点； （5 )气压支撑缸由于其工作时所 用压缩空气里含有水份， 支撑缸自身不能使用易锈铁类原材料， 制造 上有局限性， 增加了支撑缸造价， 加大了产品成本， 降低使用寿命。
弹簧顶出型也同样存在支撑缸的工作支头运行停止的位置有时 不准确。加紧力不足。 有时没支撑到位就夹紧停止， 是否正常工作无 法确认； 自动化生产中需要另外配备辅助的电信号装置。 以及锁紧机 构经常失灵， 导致支头顶不住工件而不参与工作等缺陷。
发明内容
本发明公开一种电动压力执行支撑方法，解决了现有油压工件支 撑缸油路结构复杂， 生产成本高， 控制精度差， 故障率大， 安全性差 等缺欠。
本发明还提供了适用于上述方法的精密电动支撑缸，用于实际生 产中。
本发明的技术解决方案如下： 支撑缸本体为空腔结构， 腔内分 上、 下两段， 设有可上下移动的支撑杆和电动升降器总成， 支撑杆和 电动升降装置之间设有行程空隙。空隙的两端， 即支撑杆的底部和电 动升降器的顶部分别设有开关触点， 构成电动升降器的控制电路开 关， 通过支撑杆和电动升降器的相对位移， 改变之间的间隙， 直至相 互接触， 将电动升降器的控制电路导通， 使升降器总成停止动作， 达 到支撑目的。
也可利用电机电流随支撑头与工件接触时的负载大小而变化， 控制电机控制电路开启，即通过采集电机电流的变化状况来控制电机 的启停。
具体结构如下： 电动支撑缸包括缸体、 上盖、 底座、 支撑杆、 支 撑头、 导杆、 以及开关触点、 电极定位螺钉、 摩擦离合器、 螺丝、 螺 母、减速器、减速器座、上限位开关、下限位开关、 电机、调整螺杆、 调整螺母。支撑缸本体为筒状结构， 其上、 下两端分别设有顶盖和基 座， 顶盖的中心开设有中心孔， 支撑杆套装在本体的筒管内可上下移 动， 其上端为支撑头， 由顶盖的中心孔伸出用于与工件接触， 基座上 固定有电动升降装置的减速器支架， 减速器支架内设有直流电机， 直 流电机与减速器为轴式组合装配， 减速器的输出轴头安装有空心丝 头，共同构成联动机构，丝头与外套的丝母构成可上下移动的螺纹副， 丝母的上端通过绝缘垫与开关触点固定连接构成直流电机的控制电 路的开关，电极定位螺钉连接在螺母与支撑杆之间构成直流电机的控 制电路的回路， 丝头的空心内设有摩擦离合器， 离合器上套有支撑弹 簧， 支撑幵关触点与支撑杆的下端有 0.1mm 以上间隙， 使直流电机 控制电路的开关开路。
本发明相对于现有技术的优点和进步在于：采用电动升降装置作 为机械支撑机构， 无需安装油管、 液压源、 控制阀和油管等复杂的油 压控制系统， 工作环境无污染， 结构简便， 体积精巧， 用电动支撑缸 代替油压支撑缸， 同样体积的电动支撑缸能获得比油压支撑缸大 2— 3倍的支撑力， 提高了工作效率。 电动支撑缸自动控制系统能提供准 确的工作信号， 精确控制容易， 适用于更准确精密的自动化系统和单 件批量精密加工； 有利于提高生产线的自动化控制； 对系统的安全性 更加有利可靠， 提高了支撑到支点高度的准确性和可靠性。
同时也降低了生产成本， 支撑灵活， 按装方便， 提高了从支撑到 支撑点高度的准确性和可靠性， 精确控制容易， 适用于更准确精密的 自动化系统和单件批量精密加工； 有利于提高生产线的自动化控制； 附图说明：
图 1为本发明实施例 1电动支撑缸结构示意图。
图 2为本发明实施例 1摩擦离合器结构示意图。
图 3为本发明实施例 2电动支撑缸结构示意图
具体实施方式
实施例 1
根据图 1所示， 支撑缸本体 6为筒状结构， 其上、 下两端分别设 有顶盖 9和基座 7， 顶盖 9的中心开设有中心孔， 支撑杆 1套装在本 体 6的筒管内可上下移动，其上端为支撑头 8由顶盖 9的中心孔伸出 用于与工件接触， 基座 7上固定有减速器支架 5， 减速器支架 5内设 有直流电机 16， 直流电机 16与减速器 13为轴式组合装配， 减速器 13的输出轴头安装有空心丝头 12， 共同构成联动机构， 丝头 12与外 套的丝母 4构成可上下移动的螺紋副，丝母 4的上端通过绝缘垫与开 关触点 2固定连接构成直流电机 16控制电路的开关， 电极定位螺钉 11连接在丝母 4与支撑杆 1之间构成直流电机 16的控制电路的回路， 丝头 12的空心内设有摩擦离合器 3， 离合器 3上套有支撑弹簧， 开 关触点 2与支撑杆 1的下端有 0.5mm以上间隙， 使直流电机 16控制 电路的开关开路。
工作时， 电机 16带动减速器 13转动从而带动丝头 12旋转， 丝 头 12驱动丝母 4作升降运动， 即螺旋副传动。 当支撑杆 1上端的支 撑头 8与工件接触时， 支撑杆 1即停止向上运动， 而丝母 4带动开关 触点 2继续上升， 直到开关触点 2和支撑杆 1底部间隙消除， 开关触 点 2与支撑杆 1接触， 控制电路导通， 电机 16断电， 各部件停止运 动， 此时， 工件将力传给支撑杆 1—开关触点 2—丝母 4—丝头 12→ 减速器支架 5—基座 7—工作台一完成支撑工作。
当工件加工完成， 卸下后让直流电机 16反转， 支撑杆 1恢复到 原位， 完成一个工作循环。
本发明装置中， 丝头 12与减速器 13之间设有摩擦离合器 3 (参 考图 2)， 对应的减速器支架 5上设有上下限位开关 14、 15、 通过调 整丝杆 17和调整丝母 18的上下运动，与控制电路构成并联的控制开 关。
如图 2，摩擦离合器装在丝头凹孔内,由一弹簧支撑两钢质圆形摩 擦片 24和 26,其中一摩擦片 26与凹孔下面接触，另一摩擦片 24在减 速器轴头端用弹簧挡圈 23挡住,丝头 12内孔与减速器轴头为间隙配 合，无键连接，工作时,靠弹簧支撑摩擦片,将减速器轴头 22扭矩传给丝 头 12进行工作,当工作阻力产生的扭矩大于离合器产生的扭矩时减速 器空转. 实施例 2
根据图 3， 精密电动控制行程支撑缸是采用电机 16与减速器 13 用轴式组合装配， 减速器 13输出轴头安装有丝头 12。工作时电机 16 带动减速器 13转动从而带动丝头 12转动。 丝头 12带动丝母 4按导 向销钉 20做升降运动。 即螺旋副传动。 丝母 4上端装有支撑杆 1， 并带动支撑杆 1和滑动变阻器 19做升降运动，滑动变阻器 19安装在 丝母 4下檐，减速器座 5加工一横槽，滑动变阻器 19的滑动头插在横 槽中.当丝母 4升降时，横槽拨动滑动头，滑动变阻器 19的电阻值随之 发生变化，控制电路通过读取滑动变阻器 19的电阻值， 控制电机 16 的启停， 从而控制支撑杆 1的行程.工作时当支撑杆 1上端的支撑头 8与工件接触时， 支撑力超过 2N以上时， 电机 16的电流增大， 通过 检测电机的电流来控制电机 16的停止。
同时， 通过动态读取滑动变阻器 19的电压值， 来判断支撑头 8 所处的位置， 并在数码管上实时显示出来支撑头 8的行程。 电机 16 的上限位 14和下限位 15为软限位。 工作时工件将力传给支撑头 8— 支撑杆 1—丝母 4—丝头 12—减速器座 5—基座 7—工作台一完成控 制行程支撑和距离测试工作。 当执行工作完成后， 让电机 16反转， 支撑杆 1恢复到原位， 即一个工作循环完成。 也可以根据工作需要， 自由调整支撑头 8的行程， 行程精度可达到 0. 001mm。 往复定位精度 可达 0. 01mm。 上升时支撑力可达 2N以上， 停止时支撑力根据设计要 求可达到数十乃至上百吨。 该系统设有双重电器保护。 即先是通过动态读取滑动变阻器 19 的电压设定值， 当滑动变阻器系统失灵时， 上限位开关 14和下限位 开关 15工作。
此系统是集多功能为一体， 即定位功能， 行程显示功能（距离测 试）和支撑被加工工件上升功能（停止时支撑力根据设计要求可达到 数十乃至上百吨。 运动时， 上升支撑力可根据需要从 0. 2N调整到所 需的支撑力， 此运动上升支撑力可根据需要设计）。
电机 16可为微型直流电机也可是微型伺服电机， 还可以是步进 电机控制系统的升降， 用伺服电机控制的精度更高， 但用伺服电机的 制造成本高。
实施例 3
此系统也可以用电流过负荷形式来控制支撑杆的上升，具体的工 作原理是： 电机 16动作， 支撑杆 1上端的支撑头 8与工件接触时， 电机 16的负载增大，电机 16电流会随之增大，当电流达到设定值时， 控制电路导通， 电机 16断电， 各部件停止运动， 即通过采集电机电 流的变化状况来控制电机的启停。
实施例 4
工装夹具附件的推力缸， 拉力缸， 旋转缸， 连杆压紧缸等也和电 动支撑的原理基本相同。

Claims

权 利 要 求 书
1、 一种电动压力执行支撑方法， 支撑缸本体为空腔结构， 腔内 分上、 下两段， 设有可上下移动的支撑杆和电动升降器总成， 支撑杆 和电动升降装置之间设有行程空隙， 空隙的两端， 即支撑杆的底部和 电动升降器的顶部分别设有开关触点，构成电动升降器的控制电路开 关， 通过支撑杆和电动升降器的相对位移， 改变之间的间隙， 直至相 互接触， 将电动升降器的控制电路导通， 使升降器总成停止动作， 达 到支撑目的。
2、 根据权利要求 1所述的支撑方法， 其特征在于： 利用电机电 流随支撑头与工件接触时的负载大小而变化， 控制电机控制电路开 启， 即通过采集电机电流的变化状况来控制电机的启停。
3、 根据权利要求 1或 2所述方法制成的精密电动支撑缸， 电动 支撑缸本体为筒状结构， 其上、 下两端分别设有顶盖和基座， 顶盖的 中心开设有中心孔， 支撑杆套装在本体的筒管内可上下移动， 其上端 为支撑头， 由顶盖的中心孔伸出用于与工件接触， 基座上固定有电动 升降装置的减速器支架， 减速器支架内设有直流电机， 直流电机与减 速器为轴式组合装配， 减速器的输出轴头安装有空心丝头，共同构成 联动机构， 丝头与外套的丝母构成可上下移动的螺纹副， 丝母的上端 通过绝缘垫与开关触点固定连接构成直流电机的控制电路开关，电极 定位螺钉连接在螺母与支撑杆之间构成直流电机的控制电路的回路， 丝头的空心内设有摩擦离合器， 离合器上套有支撑弹簧， 支撑开关触 点与支撑杆的下端有 0.1mm 以上间隙， 使直流电机控制电路的开关 开路。
4、 根据权利要求 3所述方法制成的精密电动支撑缸， 其特征在 于：滑动变阻器安装在丝母下檐构成联动机构， 减速器支架上加工一 横槽，滑动变阻器的滑动头插在横槽中， 当丝母升降时， 减速器支架 上横槽拨动滑动变阻器的滑动头，滑动变阻器的电阻值随之发生变 化， 控制电路通过读取滑动变阻器的电阻值， 控制电机的启停， 从而 控制支撑杆的行程。
PCT/CN2007/001763 2007-05-23 2007-06-04 Procédé de support exécutif à pression électrique et cylindre de support électrique de précision WO2008141483A1 (fr)

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