WO2013007000A1 - 一种电机行程开关控制机构 - Google Patents

一种电机行程开关控制机构 Download PDF

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Publication number
WO2013007000A1
WO2013007000A1 PCT/CN2011/001884 CN2011001884W WO2013007000A1 WO 2013007000 A1 WO2013007000 A1 WO 2013007000A1 CN 2011001884 W CN2011001884 W CN 2011001884W WO 2013007000 A1 WO2013007000 A1 WO 2013007000A1
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WO
WIPO (PCT)
Prior art keywords
switch
reset block
control mechanism
stroke adjustment
emergency stop
Prior art date
Application number
PCT/CN2011/001884
Other languages
English (en)
French (fr)
Inventor
俞锡鹏
孙勇
Original Assignee
宁波杜亚机电技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 宁波杜亚机电技术有限公司 filed Critical 宁波杜亚机电技术有限公司
Publication of WO2013007000A1 publication Critical patent/WO2013007000A1/zh

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B9/00—Screening or protective devices for wall or similar openings, with or without operating or securing mechanisms; Closures of similar construction
    • E06B9/24—Screens or other constructions affording protection against light, especially against sunshine; Similar screens for privacy or appearance; Slat blinds
    • E06B9/26—Lamellar or like blinds, e.g. venetian blinds
    • E06B9/28—Lamellar or like blinds, e.g. venetian blinds with horizontal lamellae, e.g. non-liftable
    • E06B9/30—Lamellar or like blinds, e.g. venetian blinds with horizontal lamellae, e.g. non-liftable liftable
    • E06B9/32—Operating, guiding, or securing devices therefor
    • E06B9/322—Details of operating devices, e.g. pulleys, brakes, spring drums, drives
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B9/00—Screening or protective devices for wall or similar openings, with or without operating or securing mechanisms; Closures of similar construction
    • E06B9/56—Operating, guiding or securing devices or arrangements for roll-type closures; Spring drums; Tape drums; Counterweighting arrangements therefor
    • E06B9/80—Safety measures against dropping or unauthorised opening; Braking or immobilising devices; Devices for limiting unrolling
    • E06B9/82—Safety measures against dropping or unauthorised opening; Braking or immobilising devices; Devices for limiting unrolling automatic
    • E06B9/88—Safety measures against dropping or unauthorised opening; Braking or immobilising devices; Devices for limiting unrolling automatic for limiting unrolling
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H19/00—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand
    • H01H19/02—Details
    • H01H19/10—Movable parts; Contacts mounted thereon
    • H01H19/14—Operating parts, e.g. turn knob
    • H01H19/18—Operating parts, e.g. turn knob adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. door switch, limit switch, floor-levelling switch of a lift
    • H01H19/183—Operating parts, e.g. turn knob adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. door switch, limit switch, floor-levelling switch of a lift adapted for operation by the simultaneous action of two cam plates, rotating at different speeds

Definitions

  • the invention relates to a motor, in particular to a travel switch control mechanism of a motor. Background technique
  • the output shaft of the speed reducer is connected to the lifting and transmitting mechanism, and the object moves up and down by the transmission of the lifting mechanism, and the ascending or descending to the desired position is generally controlled by the stroke switch. That is, the stroke of the object is controlled by the opening and closing of the travel switch.
  • the motor can be stopped by the emergency stop switch by the lever device.
  • the emergency stop switch requires an emergency stop by means of the lever, which reduces the reliability of the emergency stop, and since the lever device is composed of the first lever and the second lever, the contraction performance of different plastics is different, and the two levers Separation makes the change of the stroke angle easily lead to the running position of the stroke, the structure is also complicated, and the manufacturing precision and cost are high. Summary of the invention
  • the technical problem to be solved by the present invention is to provide a motor stroke switch control structure for the current state of the art, which can realize an emergency stop with a simple and reliable structure.
  • a motor stroke switch control mechanism comprising a gearbox combination, a stroke switch, a stroke adjustment reset block engaged with the gearbox combination, and an emergency stop switch, wherein The emergency stop switch and the stroke adjustment reset block are respectively capable of directly contacting the travel switch contacts of the travel switch.
  • the stroke adjustment reset block is integral, the stroke adjustment reset block includes at least a first portion and a second portion, and the first portion of the stroke adjustment reset block is engaged with the gearbox combination, the stroke The second portion of the adjustment reset block is located below the travel switch contact. It is used to directly contact the travel switch contact when the travel limit is reached.
  • a tappet at one end of the emergency stop switch is disposed in the second portion of the stroke adjustment reset block and corresponds to the position of the travel switch contact, and the elongated piece at the other end of the emergency stop switch extends to The bottom of the motor casing of the motor makes the emergency stop switch independent of the stroke reset block, and can directly contact the moving block without using the stroke adjustment reset block.
  • the second portion of the stroke adjustment reset block is provided with a slot corresponding to the position of the travel switch contact, and the tappet is disposed in the slot.
  • the tappet has a cross section in a shape of a letter.
  • the second portion of the stroke adjustment reset block is provided with a through hole corresponding to the position of the travel switch contact, and the tappet is disposed in the through hole.
  • the tappet at one end of the emergency stop switch and the second portion of the stroke reset block are juxtaposed below the travel switch contact such that the emergency stop switch and the stroke reset block are independent of each other.
  • the bottom of the motor casing is provided with an emergency stop switch hole corresponding to the position of the elongated piece.
  • the gearbox combination includes a first first gear driven by an output shaft of the motor and a second gear coupled to the stroke adjustment reset block on both sides, the first gear and the second gear meshing , so that the gearbox combination can drive the stroke adjustment reset block movement.
  • the stroke adjustment reset block is rotatably fixed to the motor housing of the motor via a shaft.
  • the invention has the advantages that the emergency stop switch can touch the travel switch contact without using the stroke adjustment reset block, so that the emergency stop is more reliable; since the stroke adjustment reset block is set as an independent In one piece, the error of the stroke angle change is 0, which improves the precision of the entire switching system and reduces the manufacturing complexity.
  • FIG. 1 is a schematic view of a motor according to a first embodiment of the present invention
  • FIG. 2 is a front elevational view of a motor without a front motor casing according to Embodiment 1 of the present invention
  • FIG. 3 is a rear elevational view of the motor without a motor case in the first embodiment of the present invention.
  • Figure 4 is a cross-sectional view taken along line A-A of the first embodiment of the present invention.
  • Figure 5 is a cross-sectional view taken along the line A-A of the second embodiment of the present invention.
  • Figure 6 is a schematic view of the trip switch control mechanism of the present invention in an emergency stop operation
  • FIG. 7 is a schematic structural diagram of Embodiment 3 of the present invention. detailed description
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • a motor stroke switch control mechanism includes a motor casing 1.
  • the bottom of the motor casing 1 is provided with a left-right symmetric gearbox combination 2, and a first gear 21 and two sides in the middle of the gearbox combination 2
  • the second gear 22 meshes.
  • the lateral direction of the second gear 22 is meshed with the stroke adjustment reset block 4, and the stroke adjustment reset block 4 is a separate integral piece, comprising at least two portions, the first portion 41 being claw-shaped, meshing with the gearbox combination 2, second Part 42 base This is horizontal, located below the stroke adjustment reset block 4, and the stroke adjustment reset block 4 is rotatably fixed to the motor via the shaft 5.
  • a stroke switch 6 is disposed above the stroke adjustment reset block 4, and a stroke switch contact 7 is provided at a lower portion of the stroke switch 6, and a second portion 42 of the stroke adjustment reset block 4 is opened corresponding to the position of the stroke switch contact 7.
  • Slot 43 see Figure 4.
  • An integral emergency stop switch 8 is disposed below the stroke adjustment reset block 4, and the tappet 81 of the emergency stop switch 8 is disposed in the slot 43.
  • the tappet 81 is elongated, and the other end of the emergency stop switch 8 is The elongated piece 82 extends to the bottom of the motor casing 1.
  • the tappet 81 has a cross-section in a straight shape, thereby making the contact surface larger, and it is less prone to top bias when the top end switch contact 7 is raised.
  • the bottom of the motor casing 1 is provided with an emergency stop switch hole corresponding to the position of the elongated piece 82.
  • the toggle piece 9 can be used to contact the elongated piece 82 through the emergency stop switch hole 11.
  • Embodiment 2 - As shown in FIG. 5, the difference between the second embodiment and the first embodiment is that the slot 43 of the stroke adjustment reset block 4 in the first embodiment is replaced by the stroke adjustment reset block.
  • the second portion 42 of the fourth portion 42 is provided with a through hole 44 corresponding to the position of the stroke switch contact 7. Referring to Fig. 5, the tappet 81 is bored in the through hole 44, and the tappet 81 is cylindrical.
  • the cross section of the travel switch contact 7 is such that it does not completely fall into the slot 43 or the through hole 44, so that the second portion 42 can actuate the travel switch contact 7 when the stroke adjustment reset block 4 is moved without causing the stroke switch to be touched
  • the point is dropped into the slot 43 or the through hole 44.
  • the travel switch contact 7 and the slot 43 are both elongated and cross, the length of the travel switch contact 7 is greater than the width of the slot 43, or the travel switch contact The length of 7 is larger than the diameter of the through hole 44.
  • the output shaft of the motor is passed through the first gear 21 to drive the first gear 21 to rotate, whereby the second gear 22 rotates. Since the stroke adjustment reset block 4 is engaged with the second gear 22, the rotation of the second gear 22 causes the stroke adjustment reset block 4 to also rotate.
  • the second portion 42 of the stroke adjustment reset block 4 activates the stroke switch contact 7 at the lower portion of the stroke switch 6 to stop the motor.
  • the elongated piece 82 is slid by the emergency stop switch hole 11 at the bottom of the motor casing 1, so that the tappet 81 of the emergency stop switch 8 protrudes from the slot 43 or the through hole 44 to touch the stroke switch. Point 7, the motor is stopped from rotating; thus, the stroke switch contact 7 can be directly activated by the emergency stop switch 8 without the need to adjust the reset block 4 by means of the stroke.
  • the stroke adjustment reset block 4 is an independent whole, the stroke angle variation error is 0, which improves the precision of the entire switching system and reduces the manufacturing complexity. Since the groove 43 or the through hole 44 is provided in the stroke adjustment reset block 4, the emergency stop switch 8 can activate the stroke switch contact 7 without the need of the stroke adjustment reset block 4, making the emergency stop more reliable.
  • Embodiment 3 Alternatively, referring to FIG. 7, the third embodiment is different from the first embodiment in that: the second portion 42' of the stroke adjustment reset block 4' is not provided with a slot or a through hole, and the emergency stop switch 8 The tappets 81 of the 'stays are arranged side by side under the electric shock 7 of the travel switch, and can each independently reach the corresponding portion of the position of the travel switch contact 7.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Mechanisms For Operating Contacts (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

一种电机行程开关控制机构，包括齿轮箱组合（2）、行程开关（6）、与该齿轮箱组合啮合的行程调节复位状块（4；4'）以及急停开关（8；8'），该急停开关和该行程调节复位状块分别能够直接触动该行程开关的行程开关触点。该开关控制机构可以较为可靠地实现急停，准确地控制行程，且结构简单，制造精度和成本较低。

Description

一种电机行程开关控制机构 技术领域
本发明涉及一种电机， 尤其是一种电机的行程开关控制机构。 背景技术
在升降机构中， 电机经减速器减速后， 减速器的输出轴连接升降的传动机构， 物体 通过升降机构的传动而上下运动，而上升或下降至所需位置一般是通过行程开关来控制 的， 即通过行程开关的开合来控制物体的行程。
如公开号为 EP0665361A1 的欧洲专利公开的一种拨杆限位开关， 可相对运动的拨 杆装置布置在离合器凸轮上， 拨杆装置由第一拨杆和第二拨杆组成， 第二拨杆通过第一 拨杆拨动， 由此触动开关的挺杆使得电机停止运转， 在紧急情况下也可以由急停开关借 助拨杆装置触动挺杆使得电机停止运转。 然而， 急停开关需要借助拨杆实现急停， 降低 了急停的可靠性， 并且由于拨杆装置由第一拨杆和第二拨杆组成， 不同塑料的收缩性能 不同， 并且两个拨杆分开使得行程角度的变化极易导致行程的跑位， 结构也较为复杂， 制造精度和成本都较高。 发明内容
本发明所要解决的技术问题是针对现有技术现状而提供一种电机行程开关控制结 构， 可以简单的结构较为可靠的实现急停。
本发明解决上述技术问题所采用的技术方案为：一种电机行程开关控制机构，包括 齿轮箱组合、 行程开关、 与所述齿轮箱组合啮合的行程调节复位状块以及急停开关， 其 特征在于，所述急停开关和所述行程调节复位状块分别能够直接触动所述行程开关的行 程开关触点。
所述行程调节复位状块为一体的，所述行程调节复位状块至少包括第一部分和第二 部分， 所述行程调节复位状块的所述第一部分与所述齿轮箱组合啮合， 所述行程调节复 位状块的所述第二部分位于所述行程开关触点下方。用于在行程限位时直接触动行程开 关触点。
所述急停开关一端的挺杆穿设在所述行程调节复位状块的所述第二部分内并且与 所述行程开关触点位置对应，所述急停开关另一端的长形片延伸到所述电机的电机壳的 底部， 使得急停开关与行程复位状块独立， 不需借助行程调节复位状块就可直接触动行
- 1 - 确认本 程开关触点， 使急停更加可靠。
所述行程调节复位状块的所述第二部分与所述行程开关触点位置对应处开设有槽， 所述挺杆穿设在所述槽内。
优选地， 所述挺杆的横截面为一字形。
可替代地，所述行程调节复位状块的所述第二部分与所述行程开关触点位置对应处 开设有通孔， 所述挺杆穿设在所述通孔内。
或者，所述急停开关一端的挺杆和所述行程复位状块的所述第二部分并列设置在所 述行程开关触点的下方， 以使得急停开关和行程复位状块各自独立。
所述电机壳的底部对应所述长形片的位置开设有急停开关孔。
所述齿轮箱组合包括中间的由所述电机的输出轴驱动的第一齿轮和两侧的与所述 行程调节复位状块啮合的第二齿轮， 所述第一齿轮和所述第二齿轮啮合， 使得齿轮箱组 合可以带动行程调节复位状块运动。
行程调节复位状块通过轴杆能转动地固定在所述电机的电机壳上。
与现有技术相比，本发明的优点在于：急停开关不需借助行程调节复位状块就可触 动行程开关触点， 使急停更加可靠； 由于将行程调节复位状块设为一个独立的一体件， 则其行程角度变化误差为 0， 提高了整个开关系统的精密度， 减少了制造的复杂性。 附图说明
图 1为本发明实施例一的电机的示意图；
图 2为本发明实施例一的电机中无前电机壳的前视图；
图 3为本发明实施例一的电机中无电机壳的后视图；
图 4为本发明实施例一的 A-A向剖面图；
图 5为本发明实施例二的 A-A向剖面图；
图 6为本发明的行程开关控制机构急停操作时的示意图；
图 7为本发明实施例三的结构示意图。 具体实施方式
以下结合附图实施例对本发明作进一步详细描述。
实施例一：
参见图 2和图 3， 一种电机行程开关控制机构， 包括电机壳 1， 电机壳 1的底部设 有左右对称的齿轮箱组合 2， 齿轮箱组合 2中间的第一齿轮 21与两侧的第二齿轮 22啮 合。 第二齿轮 22的侧向与行程调节复位状块 4啮合， 行程调节复位状块 4为独立的一 体件， 至少包括两个部分， 第一部分 41呈爪状， 与齿轮箱组合 2啮合， 第二部分 42基 本为水平， 位于行程调节复位状块 4的下方， 行程调节复位状块 4通过轴杆 5可转动地 固定到电机上。
行程调节复位状块 4的上方设有行程开关 6， 行程开关 6的下部设有突起的行程开 关触点 7，行程调节复位状块 4的第二部分 42对应行程开关触点 7的位置开设有槽 43， 参见图 4。 行程调节复位状块 4的下方设有一体的急停开关 8， 急停开关 8—端的挺杆 81穿设在槽 43内， 此时挺杆 81为长条形， 急停开关 8另一端的长形片 82延伸到电机 壳 1的底部。 优选地， 挺杆 81的横截面为一字形， 由此使得接触面较大， 上升顶行程 开关触点 7的时候不易顶偏。
参见图 1， 电机壳 1的底部对应长形片 82的位置开设有急停开关孔 11， 可使用拨 动杆 9通过急停开关孔 11接触到长形片 82。 实施例二- 如图 5所示， 本实施例二与实施例一的区别点在于， 本实施例二将实施例一中的行 程调节复位状块 4的槽 43替代为：行程调节复位状块 4的第二部分 42对应行程开关触 点 7的位置开设有通孔 44， 参见图 5， 挺杆 81穿设在通孔 44内， 此时挺杆 81为圆柱 形。 行程开关触点 7的截面使得其不完全落入到槽 43或通孔 44内， 以使得行程调节复 位状块 4运动时第二部分 42可以触动行程开关触点 7而不至于使得行程开关触点 Ί落 到槽 43或通孔 44内， 优选地， 行程开关触点 7和槽 43均为长条形并且成十字， 行程 开关触点 7的长度大于槽 43的宽度， 或者行程开关触点 7的长度大于通孔 44的直径。 本发明的原理与工作过程如下：
当电机上电后， 电机的输出轴穿设在第一齿轮 21内， 带动第一齿轮 21转动， 由此 第二齿轮 22转动。 由于行程调节复位状块 4与第二齿轮 22啮合， 第二齿轮 22的转动 带动行程调节复位状块 4也跟着转动。 当到达行程限位点时， 行程调节复位状块 4的第 二部分 42触动行程开关 6下部的行程开关触点 7， 使得电机停止。 当出现紧急情况时， 参见图 6， 通过电机壳 1底部的急停开关孔 11拨动长形片 82， 使得急停开关 8的挺杆 81伸出槽 43或通孔 44触动行程开关触点 7， 使得电机停止转动； 由此， 无需借助行程 调节复位状块 4就可以直接通过急停开关 8触动行程开关触点 7。
由于行程调节复位状块 4为一个独立的整体， 其行程角度变化误差为 0， 提高了整 个开关系统的精密度， 减少了制造的复杂性。 由于在行程调节复位状块 4中设有槽 43 或通孔 44， 急停开关 8不需借助行程调节复位状块 4就可触动行程开关触点 7， 使急停 更加可靠。 实施例三: 可替代地， 参见图 7， 本实施例三与上述实施例一的不同之处在于： 行程调节复位 状块 4'的第二部分 42'不设有槽或通孔， 其与急停开关 8'的挺杆 81，并列设置在行程开 关触电 7的下方， 可以各自独立地顶到行程开关触点 7位置相应的部分。行程调节复位 状块 4'的第一部分 41 '仍是与第二齿轮 22啮合。 以上所述仅为本发明的优选实施方式，应当指出，对于本领域的普通技术人员而言， 在不脱离本发明的原理前提下， 还可以做出多种变形和改进， 这也应该视为本发明的保 护范围。

Claims

1、 一种电机行程开关控制机构， 包括齿轮箱组合 (2)、 行程开关 (6)、 与所述齿轮箱 组合 (2)啮合的行程调节复位状块 (4; 4')以及急停开关 (8; 8'), 其特征在于： 所述急停开 关 (8)和所述行程调节复位状块 (4; 4')分别能够直接触动所述行程开关 (6)的行程开关触 点 (7)。
2、如权利要求 1所述的开关控制机构，其特征在于，所述行程调节复位状块 (4; 4') 为一体的， 所述行程调节复位状块 (4; 4')至少包括第一部分 (41 ; 4Γ)和第二部分 (42; 42'), 所述行程调节复位状块 (4; 4')的所述第一部分 (41 ; 4Γ)与所述齿轮箱组合 (2)啮合， 所述行程调节复位状块 (4; 4')的所述第二部分 (42; 42')位于所述行程开关触点 (7)下方。
3、 如权利要求 2所述的开关控制机构， 其特征在于， 所述急停开关 (8)—端的挺杆 (81)穿设在所述行程调节复位状块 (4)的所述第二部分 (42)内并且与所述行程开关触点 (7) 位置对应， 所述急停开关 (8)另一端的长形片 (82)延伸到所述电机的电机壳 (1)的底部。
4、 如权利要求 3所述的开关控制机构， 其特征在于， 所述行程调节复位状块 (4)的 所述第二部分 (42)与所述行程开关触点 (7)位置对应处开设有槽 (43)，所述挺杆 (81)穿设在 所述槽 (43)内。
5、 如权利要求 4所述的开关控制机构， 其特征在于， 所述挺杆 (81)的横截面为一 字形。 .； -
6、 如权利要求 3所述的开关控制机构， 其特征在于， 所述行程调节复位状块 (4)的 所述第二部分 (42)与所述行程开关触点 (7)位置对应处开设有通孔 (44)，所述挺杆 (81)穿设 在所述通孔 (44)内。
7、如权利要求 2所述的开关控制机构， 其特征在在于， 所述急停开关 (8')—端的挺 杆 (81，)和所述行程复位状块 (4')的所述第二部分 (42')并列设置在所述行程开关触点 (7)的 下方。
8、 如权利要求 3-6中任一项所述的开关控制机构， 其特征在于， 所述电机壳 (1)的 底部对应所述长形片 (82)的位置开设有急停开关孔 (11)。
9、 如权利要求 1-7中任一项所述的开关控制机构， 其特征在于， 所述齿轮箱组合 (2)包括中间的由所述电机的输出轴驱动的第一齿轮 (21)和两侧的与所述行程调节复位 状块 (4)啮合的第二齿轮 (22)， 所述第一齿轮 (21)和所述第二齿轮 (22)啮合。
10、 如权利要求 1-7中任一项所述的开关控制机构， 其特征在于， 行程调节复^状 块 (4; 4')通过轴杆 (5)能转动地固定在所述电机上。
PCT/CN2011/001884 2011-07-11 2011-11-10 一种电机行程开关控制机构 WO2013007000A1 (zh)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH657939A5 (en) * 1980-03-26 1986-09-30 Elero Antrieb Sonnenschutz Shaft limit switch
CN2886794Y (zh) * 2005-12-31 2007-04-04 叶进福 直推式漏电断路器手动与自动合闸装置
CN101969000A (zh) * 2010-11-10 2011-02-09 无锡真木物流设备有限公司 链条输送机行程开关控制结构
CN202142435U (zh) * 2011-07-11 2012-02-08 宁波杜亚机电技术有限公司 一种电机行程开关控制机构

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH657939A5 (en) * 1980-03-26 1986-09-30 Elero Antrieb Sonnenschutz Shaft limit switch
CN2886794Y (zh) * 2005-12-31 2007-04-04 叶进福 直推式漏电断路器手动与自动合闸装置
CN101969000A (zh) * 2010-11-10 2011-02-09 无锡真木物流设备有限公司 链条输送机行程开关控制结构
CN202142435U (zh) * 2011-07-11 2012-02-08 宁波杜亚机电技术有限公司 一种电机行程开关控制机构

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