WO2017088344A1 - 一种助力型磁性接近开关 - Google Patents

一种助力型磁性接近开关 Download PDF

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Publication number
WO2017088344A1
WO2017088344A1 PCT/CN2016/079457 CN2016079457W WO2017088344A1 WO 2017088344 A1 WO2017088344 A1 WO 2017088344A1 CN 2016079457 W CN2016079457 W CN 2016079457W WO 2017088344 A1 WO2017088344 A1 WO 2017088344A1
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WO
WIPO (PCT)
Prior art keywords
magnet
terminal
proximity switch
limiting
disposed
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PCT/CN2016/079457
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English (en)
French (fr)
Inventor
刘利
Original Assignee
佛山市溢釜科技有限公司
佛山市川东磁电股份有限公司
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Application filed by 佛山市溢釜科技有限公司, 佛山市川东磁电股份有限公司 filed Critical 佛山市溢釜科技有限公司
Priority to KR1020177034630A priority Critical patent/KR102007113B1/ko
Priority to US15/736,226 priority patent/US10347449B2/en
Publication of WO2017088344A1 publication Critical patent/WO2017088344A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H36/00—Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding
    • H01H36/0006—Permanent magnet actuating reed switches
    • H01H36/0033—Mountings; Housings; Connections
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H36/00—Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding
    • H01H36/0006—Permanent magnet actuating reed switches
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H36/00—Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding
    • H01H36/02—Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding actuated by movement of a float carrying a magnet
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H36/00—Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding
    • H01H36/0006—Permanent magnet actuating reed switches
    • H01H36/0046—Limit switches, also fail-safe operation or anti-tamper considerations
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H36/00—Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding
    • H01H36/0073—Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding actuated by relative movement between two magnets
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H5/00—Snap-action arrangements, i.e. in which during a single opening operation or a single closing operation energy is first stored and then released to produce or assist the contact movement
    • H01H5/04—Energy stored by deformation of elastic members
    • H01H5/18—Energy stored by deformation of elastic members by flexing of blade springs
    • H01H5/22—Energy stored by deformation of elastic members by flexing of blade springs blade spring with at least one snap-acting leg and at least one separate contact-carrying or contact-actuating leg
    • H01H5/24—Energy stored by deformation of elastic members by flexing of blade springs blade spring with at least one snap-acting leg and at least one separate contact-carrying or contact-actuating leg having three legs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2205/00—Movable contacts
    • H01H2205/002—Movable contacts fixed to operating part

Definitions

  • the invention relates to the technical field of magnetic switches, in particular to a power-assisted magnetic proximity switch.
  • the magnetic proximity switch is a kind of proximity switch.
  • the proximity switch is one of many types in the sensor family. It can change the positional relationship by the magnetic original and convert the non-electricity or electromagnetic quantity into the required electrical signal to achieve control. Or the purpose of the measurement.
  • automatic navigation and positioning detection are the core technologies for intelligent control, and the position detection and execution control schemes provided by the proximity switches have advantages that other controllers do not have.
  • the magnetic proximity switch is in the military field of magnetic fuses, magnetic detection mines, spacecraft fluxgates, high-speed equipment manufacturing industries such as high-speed trains, automatic elevators, magnetocaloric power generation, automatic processing equipment, automobile speed control and sunroof opening.
  • Such advanced manufacturing and household appliances such as door switches, opening and closing covers, pressure detection, etc., can achieve strong detection and stable safety control capabilities.
  • Cikon patent CN201410299835.1 discloses a novel magnetic proximity switch comprising a housing, a magnet movable up and down in the upper movable area of the housing, and two terminal pieces arranged side by side at the bottom of the housing, wherein one terminal piece is provided at the upper end There is a shrapnel, and a middle portion of the casing is provided with a swingable booster rod and a limiting mechanism matched therewith.
  • the elastic piece is provided with an elastic tongue and is disposed on the boosting portion of the booster rod.
  • the swinging fulcrum and the assisting portion of the booster lever are on the same horizontal line as the torque fulcrum of the elastic tongue, and the arm between the torque fulcrum and the swing fulcrum is longer, and the control stroke and the assisting portion of the assisting rod are oscillated in the limiting mechanism at one end.
  • the ratio between the strokes is large, which causes the torque conversion and the stroke assisting effect of the booster rod to be inconspicuous; the magnet moves up and down against the booster rod to cause it to oscillate and trigger the shrapnel action, and there is a certain relative friction between the magnet and the casing and the booster rod.
  • the object of the present invention is to provide a compact, stable and reliable assisted magnetic proximity switch in view of the deficiencies and deficiencies of the prior art.
  • a power-assisted magnetic proximity switch includes a housing, and a magnet, a first terminal and a second terminal are disposed in the inner cavity of the housing, and the first terminal and the second terminal are arranged side by side and vertically Straight through to the lower end plate of the housing; the upper end of the second terminal is laterally provided with an elastic contact piece, and the movable end of the elastic contact piece is disposed above the first terminal; the auxiliary rod is arranged inside the housing, and the auxiliary rod is externally The end is hinged to the housing; the elastic contact piece is provided with an elastic tongue, and the free end of the elastic tongue abuts on the inner end of the power assisting rod; the outer end of the boosting rod is provided with an integral structure of "L" shape
  • the limiting board has a limiting mechanism engaged with the limiting board; the upper side of the movable end of the power lever is provided with a tray, the magnet is disposed between the tray and the upper end plate of the housing, and the magnet is fixedly connected with the tray.
  • the upper end surface of the tray is provided with a mounting opening, and the lower end of the magnet is disposed in the mounting opening and is in an interference fit therewith.
  • the height difference between the bottom surface of the mounting opening and the upper end surface of the tray is A
  • the height of the magnet is H
  • the ratio of A:H ranges between 0.2 and 1.
  • the inner side wall of the housing above the first terminal is provided with a fulcrum
  • the outer end of the power assisting rod is provided with a collar
  • the collar is sleeved on the fulcrum to rotate and cooperate with the fulcrum
  • the collar and the booster rod have an integral structure of "L" shape.
  • the limiting mechanism comprises two relatively spaced apart limiting plates, wherein the two limiting plates are disposed above the supporting point, and the opening of the slot between the two limiting plates is directed to the fulcrum;
  • the plate is movably disposed in the through groove between the two limiting plates.
  • the distance between the inner sides of the two limiting plates is D
  • the thickness of the limiting insert is S
  • the ratio of D:S ranges from 1.1 to 1.9
  • the angle of the stroke is P
  • the ratio of P to D:S is proportional.
  • the upper end of the first terminal is provided with a horizontal folding frame, and the folding page is provided with a static contact, the movable end of the elastic contact piece is disposed above the folding page, and the elastic contact piece is provided with the movement of the static contact Contact.
  • the inner side wall of the casing between the folding and the power assisting bar is provided with a "J"-shaped arc-guiding strip, and the arc-guiding strip is laterally disposed and the "J"-shaped hook portion and the movable contact of the arc-guiding strip Corresponding settings.
  • the invention has the beneficial effects that the structure of the invention is reasonable, and the stroke angle of the booster rod and the magnet is controlled by the stroke spacing of the limit insert and the limit plate, so that the elastic tongue keeps the booster rod when the magnet reaches the stroke limit
  • the upward resetting torque can increase the restoring force provided by the elastic tongue when the contact is broken; the magnet can rotate freely through the tray and the booster bar to avoid the leakage of the magnetic powder and the component plating caused by the friction, and reduce the wear of the component to improve the contact.
  • Electrical connection reliability; the contact breaking stroke has a guide arc groove protection structure to avoid the influence of the arcing phenomenon on the insulating housing and components, and effectively improve the working stability and service life of the proximity switch.
  • Figure 1 is a schematic view of the overall exploded structure of the present invention
  • Figure 2 is a schematic view showing the internal assembly structure of the present invention.
  • Figure 3 is a schematic enlarged view of the portion B of Figure 2;
  • Fig. 4 is a schematic view showing the internal planar structure of the ON state of the present invention.
  • a power-assisted magnetic proximity switch includes a housing 1 in which a magnet 4, a first terminal 11 and a second terminal 12 are disposed.
  • the first terminal 11 and the second terminal 12 are arranged side by side and are vertically disposed on the lower end plate of the housing 1; the upper end of the second terminal 12 is laterally provided with the elastic contact piece 2, and the movable end of the elastic contact piece 2 is disposed.
  • the housing 1 Above the first terminal 11; the housing 1 is provided with a booster rod 3, the outer end of the booster rod 3 is hinged with the housing 1; the elastic contact piece 2 is provided with an elastic tongue piece 21, and the elastic tongue piece 21 The free end abuts on the inner end of the booster rod 3; the magnet 4 drives the booster rod 3 to operate, so that the elastic contact 2 turns on the circuit of the first terminal 11 and the second terminal 12, and the torque of the elastic tongue 21 and the booster rod 3
  • the resetting force of the elastic contact piece 2 is provided, so that the principle that the proximity switch is turned on and the breaking control is not substantially different from the prior art, and the repeated description is not repeated here.
  • the outer end of the booster rod 3 is provided with a limiting inserting plate 31 having an "L"-shaped integral structure, and the housing 1 is provided with a limiting mechanism engaged with the limiting inserting plate 31; the auxiliary assisting rod 3 passes through the outer end thereof
  • the upper and lower swinging motions of the inner end of the booster rod 3 are hinged on the casing 1, and the limit inserting plate 31 provided by the "L” is engaged with the limiting mechanism to limit the upper and lower swinging limit strokes of the inner end of the boosting lever 3; for convenience, the assisting lever 3 is described.
  • the hinge point of the outer end of the booster rod 3 and the casing 1 is set to M
  • the connection point of the inner end of the booster rod 3 and the elastic tongue 21 is N
  • the connection point of the elastic contact piece 2 and the second terminal 12 is K.
  • connection between M, N, and K constitutes a triangular moment relationship, wherein the inner angle of the N point is an obtuse angle and the height of the triangle corresponding to the N point is H; when the booster rod 3 is in the upper limit position, that is, the initial breaking state, H The maximum value, and the moment generated by the elastic tongue 21 on the KN line maintains an upward supporting force on the N point on the booster rod 3; when the magnet 4 drives the N point of the booster rod 3 to rotate downward to reach the limit position, H Is the minimum value and H is greater than 0, so the elastic tongue 21 is still in the elastic state of the elastic contact 2 Applying an upward force of the lever 3 resetting moment, whereby the magnet 4 is released after the force of the tab 21 can provide a large torque is reset, thereby ensuring the sensitivity of the proximity switch breaking.
  • a tray 33 is disposed on the upper side of the movable end of the urging rod 3, the magnet 4 is disposed between the tray 33 and the upper end plate of the casing 1, and the magnet 4 is fixedly connected with the tray 33; the magnet 4 passes through the tray 33 and the booster rod 3
  • the rotation of the whole body prevents the magnet 4 from being damaged by the wear of the magnetic powder which affects the electrical connection reliability of the contacts.
  • the upper end surface of the tray 33 is provided with a mounting opening 34.
  • the lower end of the magnet 4 is inserted into the mounting opening 34 and is in an interference fit therewith.
  • the magnet 4 is fixedly connected to the tray 33 through the mounting opening 34.
  • the tray 33 and the booster lever 3 are The insulating material is integrally formed to improve the assembly efficiency and relative positional accuracy of the components.
  • the height difference between the bottom surface of the mounting opening 34 and the upper end surface of the tray 33 is A
  • the height of the magnet 4 is H
  • the ratio of A:H ranges from 0.2 to 1.
  • the magnet 4 can be partially on the tray 33.
  • the connection strength between the magnet 4 and the tray 33 varies according to the A:H value
  • the magnetic contact material may be provided on the contact surface of the magnet 4 and the tray 33, or the tray 33 may be made of a magnetically-distributing material, thereby
  • the control uses the environment to achieve magnetic induction drive control in a single direction.
  • a fulcrum 13 is disposed on the inner side wall of the housing 1 above the first terminal 11 , and the outer end of the power assisting rod 3 is provided with a collar 32 , and the collar 32 is sleeved on the fulcrum 13 to rotate and cooperate with the fulcrum 13; 31 is disposed on the collar 32, and the limiting insert 31, the collar 32, and the assisting rod 3 have an integral structure of an "L" shape.
  • the limiting mechanism includes two relatively spaced apart limiting plates 15 .
  • the two limiting plates 15 are disposed above the fulcrum 13 , and the opening of the slot between the two limiting plates 15 is directed to the fulcrum 13 ;
  • the plug board 31 can
  • the utility model is disposed in the through slot between the two limiting plates 15 , and the limiting insertion plate 31 swings left and right between the two limiting plates 15 , and the limiting insertion plate 31 and the auxiliary lever 3 are integrated to control the auxiliary lever
  • the upper and lower swing limit strokes of the inner end of the 3, the "L"-shaped booster rod 3 can improve the internal space utilization ratio of the casing 1, reduce the overall volume, and improve the rationality of the space layout;
  • the magnet 4 is in the tray 33 with the booster rod 3 Rotation, thereby calculating and controlling the spacing between the two limiting plates 15, to achieve precise control of the magnetic field rotation angle of the magnet 4.
  • the distance between the inner sides of the two limiting plates 15 is D
  • the thickness of the limiting interposer 31 is S
  • the ratio of D:S ranges from 1.1 to 1.9
  • the magnet 4 When the angle of the rotation of the assisting rod 3 is P, then the ratio of P to D:S is proportional; the angle P of the rotation of the magnet 4 relative to the upper end plate of the casing 1 during the closing and breaking stroke is affected by D:S Ratio control, and the D:S ratio causes the stroke angle P of the magnet 4 to range between 1 and 20°; the preferred D:S ratio of the present invention ranges from 1.3 to 1.7, and the stroke angle P of the magnet 4 The best range is 5-15°.
  • the upper end of the first terminal 11 is provided with a horizontal hinge 16 , and the hinge 16 is provided with a static contact 14 .
  • the movable end of the elastic contact 2 is disposed above the hinge 16 and the elastic contact 2 is provided with static contact
  • the movable contact 22 is matched with the point 14; the inner side wall of the casing 1 between the hinge 16 and the booster rod 3 is provided with a "J"-shaped arc-guiding strip 17, and the arc-guiding strip 17 is laterally disposed and the arc-guiding strip 17 is disposed.
  • the "J"-shaped hook portion is disposed corresponding to the movable contact 22, and the control range of the arc-guiding rod 17 is matched with the action stroke of the movable contact 22, thereby preventing the movable contact 22 and the stationary contact 14 from being connected and disconnected.
  • the arcing phenomenon affects the housing 1 and other internal components, improving overall operational stability and service life.

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  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)

Abstract

一种助力型磁性接近开关，包括壳体（1），壳体的内腔中设有磁铁（4）、第一端子（11）和第二端子（12），第二端子的上端横向设有弹性触片（2）；壳体内设有助力杆（3），弹性触片上设有弹力舌片（21），助力杆的外端设有与其呈"L"形一体结构的限行插板（31），壳体内设有与限行插板配合的限位机构（15）；助力杆活动端的上侧面上设有托盘（33），磁铁与托盘固定连接。该助力型磁性接近开关结构合理，通过限行插板与限位机构的行程间距配合，实现助力杆和磁铁的行程夹角的控制，提高弹性舌片在触点分断时提供的复位力；磁铁通过托盘与助力杆一体自由转动，提高触点的电气连接可靠性；触点分断行程具有导弧槽保护结构，提高工作稳定性和使用寿命。

Description

一种助力型磁性接近开关 技术领域
本发明涉及磁性开关技术领域，具体指一种助力型磁性接近开关。
背景技术
磁性接近开关是接近开关的一种，接近开关是传感器家族中众多种类中的一种，它能通过磁性原件感知位置关系变化，将非电量或电磁量转化为所需的电信号，从而达到控制或测量的目的。对于机器人应用技术而言，自动导航和定位检测是实现智能化控制的核心技术，而接近开关所能提供的位置检测和执行控制方案，具有其他控制器所不具备的优点。并且，磁性接近开关在在磁引信弹头、磁探测水雷、航天器磁通门等军工领域，高速列车、自动电梯、磁热发电等高端装备制造业产业、自动化加工设备、汽车车速控制和天窗开启等先进制造业以及家用电器的门开关、开合盖、压力检测等领域，均能实现较强的检测和稳定的安全控制能力。
中国专利CN201410299835.1公开了一种新型磁性接近开关，包括壳体、在壳体上部活动区内可上下移动的磁铁、壳体底部并列设置的两个接线端片，其中一个接线端片上端设有弹片，壳体中部设有可摆动的助力杆和与其配合的限位机构，弹片上设有弹力舌片且抵设于助力杆的助力部上。这种结构解决动作机构中的助力杆和磁铁动作行程过大、弹力舌片的易金属疲劳的问题。但是其助力杆的摆动支点、助力部与弹力舌片的力矩支点在同一水平线上，且力矩支点与摆动支点之间力臂较长，助力杆一端在限位机构内的控制行程与助力部摆动行程之间的比率较大，导致助力杆的力矩转化和行程助力效果不明显；磁铁上下活动抵触助力杆使其摆动进而触发弹片动作，磁铁与壳体、助力杆之间均存在一定的相对摩擦，容易产生磁粉或部件上电镀层的掉落，影响弹片和接线端片上触点之间的电气连接可靠性；助力杆的力矩转化虽然保证了大电流通断控制的触发稳定性，但是触点之间在电流负载变化时产生的拉弧现象并没有得到很好的解决，触点和金属部件表面氧化问题始终存在，影响了产品的工作稳定性和使用寿命。
因此，现有技术还有待于改进和发展。
发明内容
本发明的目的在于针对现有技术的缺陷和不足，提供一种结构紧凑、稳定可靠的助力型磁性接近开关。
为了实现上述目的，本发明采用以下技术方案：
本发明所述的一种助力型磁性接近开关，包括壳体，所述壳体的内腔中设有磁铁、第一端子和第二端子，第一端子和第二端子并列间隔设置且分别竖直穿设于壳体下端板上；所述第二端子的上端横向设有弹性触片，弹性触片的活动端设于第一端子的上方；所述壳体内设有助力杆，助力杆外端与壳体铰接；所述弹性触片上设有弹力舌片，弹力舌片的自由端抵设于助力杆里端上；所述助力杆的外端设有与其呈“L”形一体结构的限行插板，壳体内设有与限行插板配合的限位机构；所述助力杆活动端的上侧面上设有托盘，磁铁设于托盘和壳体上端板之间，且磁铁与托盘固定连接。
根据以上方案，所述托盘上端面设有安装口，磁铁下端穿设于安装口内且与其为过盈配合。
根据以上方案，所述安装口底面与托盘上端面之间的高度差为A，磁铁的高度为H，则A：H的比值范围在0.2-1之间。
根据以上方案，所述第一端子上方的壳体内侧壁上设有支点，助力杆的外端设有套环，且套环套设于支点上与其转动配合；所述限行插板设于套环上，且限行插板、套环、助力杆呈“L”形的一体结构。
根据以上方案，所述限位机构包括两个相对间隔设置的限位板，两个限位板均设于支点上方，且两个限位板之间的通槽开口指向支点；所述限行插板可活动地穿设于两个限位板之间的通槽内。
根据以上方案，所述两个限位板内侧面之间的间距为D，限行插板的厚度为S，则D：S的比值范围在1.1-1.9之间；所述磁铁随助力杆转动的行程夹角为P，则P与D：S比值成正比。
根据以上方案，所述第一端子上端设有横向的折页，折页上设有静触点，弹性触片的活动端设于折页上方且弹性触片上设有与静触点配合的动触点。
根据以上方案，所述折页与助力杆之间的壳体内侧壁上设有“J”形的导弧条，导弧条横向设置且导弧条的“J”形勾部与动触点对应设置。
本发明有益效果为：本发明结构合理，通过限位插片与限位板的行程间距配合，实现助力杆和磁铁的行程夹角的控制，使磁铁下行行程极限时弹性舌片对助力杆保持向上的复位力矩，从而可提高弹性舌片在触点分断时提供的复位力；磁铁通过托盘与助力杆一体自由转动，避免摩擦导致的磁粉及部件电镀层掉落，降低部件磨损提高触点的电气连接可靠性；触点分断行程具有导弧槽保护结构，避免拉弧现象对绝缘壳体和部件产生影响，有效提高接近开关的工作稳定性和使用寿命。
附图说明
图1是本发明的整体爆炸结构示意图；
图2是本发明的内部装配结构示意图；
图3是图2中B部放大结构示意图；
图4是本发明接通状态的内部平面结构示意图。
图中：
1、壳体；2、弹性触片；3、助力杆；4、磁铁；11、第一端子；12、第二端子；13、支点；14、静触点；15、限位板；16、折页；17、导弧条；21、弹力舌片；22、动触点；31、限行插板；32、套环；33、托盘；34、安装口。
具体实施方式
下面结合附图与实施例对本发明的技术方案进行说明。
如图1-3所示，本发明所述的一种助力型磁性接近开关，包括壳体1，所述壳体1的内腔中设有磁铁4、第一端子11和第二端子12，第一端子11和第二端子12并列间隔设置且分别竖直穿设于壳体1下端板上；所述第二端子12的上端横向设有弹性触片2，弹性触片2的活动端设于第一端子11的上方；所述壳体1内设有助力杆3，助力杆3外端与壳体1铰接；所述弹性触片2上设有弹力舌片21，弹力舌片21的自由端抵设于助力杆3里端上；所述磁铁4驱动助力杆3动作，使弹性触片2接通第一端子11和第二端子12电路，弹力舌片21与助力杆3的力矩提供弹性触片2的复位力，从而实现接近开关接通、分断控制原理与现有技术无本质区别，在此不做重复描述。
所述助力杆3的外端设有与其呈“L”形一体结构的限行插板31，壳体1内设有与限行插板31配合的限位机构；所述助力杆3通过其外端铰接在壳体1上实现助力杆3里端的上下摆动动作，“L”设置的限行插板31通过与限位机构配合从而限制助力杆3里端的上下摆动极限行程；为了方便描述助力杆3的力矩变化情况，设定助力杆3外端与壳体1的铰接点为M，助力杆3里端与弹力舌片21连接点为N，弹性触片2与第二端子12连接点为K，且M、N、K之间连线组成三角力矩关系，其中的N点的内角为钝角且N点对应的三角形高为H；所述助力杆3在上行极限位也就是初始分断状态时，H为最大值，且K-N连线上的弹力舌片21产生的力矩对助力杆3上的N点保持向上的支撑力；当磁铁4驱动助力杆3的N点向下转动到达极限位置时，H为最小值且H大于0，因此弹性触片2接通状态下弹力舌片21仍旧对助力杆3施加向上的复位力矩，从而磁铁4被释放后弹力舌片21能提供一个较大的复位扭力，从而保证接近开关的分断灵敏度。
所述助力杆3活动端的上侧面上设有托盘33，磁铁4设于托盘33和壳体1上端板之间，且磁铁4与托盘33固定连接；所述磁铁4通过托盘33与助力杆3一体转动，从而避免磁铁4因磨损掉落的磁粉影响触点的电气连接可靠性。
所述托盘33上端面设有安装口34，磁铁4下端穿设于安装口34内且与其为过盈配合，磁铁4通过安装口34与托盘33固定连接，所述托盘33与助力杆3为绝缘材料一体加工成型，可提高部件的装配效率和相对位置精确度。
所述安装口34底面与托盘33上端面之间的高度差为A，磁铁4的高度为H，则A：H的比值范围在0.2-1之间，所述磁铁4在托盘33上可局部装配和完全装配，磁铁4与托盘33之间的连接强度根据A：H值变化，且磁铁4与托盘33的接触面上可设置隔磁材料，或者托盘33采用隔磁材料制作，从而根据不同的控制使用环境，实现单一方向的磁力感应驱动控制。
所述第一端子11上方的壳体1内侧壁上设有支点13，助力杆3的外端设有套环32，且套环32套设于支点13上与其转动配合；所述限行插板31设于套环32上，且限行插板31、套环32、助力杆3呈“L”形的一体结构。
所述限位机构包括两个相对间隔设置的限位板15，两个限位板15均设于支点13上方，且两个限位板15之间的通槽开口指向支点13；所述限行插板31可 活动地穿设于两个限位板15之间的通槽内，限行插板31在两个限位板15之间左右摆动，而限行插板31与助力杆3为一体结构从而控制助力杆3里端的上下摆动极限行程，“L”形结构的助力杆3可提高壳体1的内部空间利用率，缩小整体体积，提高空间布局的合理性；磁铁4在托盘33内随助力杆3上下转动，从而通过计算和控制两个限位板15之间的间距，实现磁铁4磁力线旋转角度的精确控制。
如图4所示，所述两个限位板15内侧面之间的间距为D，限行插板31的厚度为S，则D：S的比值范围在1.1-1.9之间；所述磁铁4随助力杆3转动的行程夹角为P，则P与D：S比值成正比；所述磁铁4在接通和分断行程中相对壳体1上端板转动的行程夹角P受D：S的比值控制，且该D：S比值使磁铁4的行程夹角P范围在1-20°之间；本发明优选的D：S比值范围在1.3-1.7之间，则磁铁4的行程夹角P最佳范围在5-15°。
所述第一端子11上端设有横向的折页16，折页16上设有静触点14，弹性触片2的活动端设于折页16上方且弹性触片2上设有与静触点14配合的动触点22；所述折页16与助力杆3之间的壳体1内侧壁上设有“J”形的导弧条17，导弧条17横向设置且导弧条17的“J”形勾部与动触点22对应设置，导弧条17的控制范围与动触点22的动作行程匹配，从而避免动触点22与静触点14接通和分断过程中产生的拉弧现象对壳体1以及其他内部部件产生影响，提高整体的工作稳定性和使用寿命。
以上所述仅是本发明的较佳实施方式，故凡依本发明专利申请范围所述的构造、特征及原理所做的等效变化或修饰，均包括于本发明专利申请范围内。

Claims (8)

  1. 一种助力型磁性接近开关，包括壳体(1)，所述壳体(1)的内腔中设有磁铁(4)、第一端子(11)和第二端子(12)，第一端子(11)和第二端子(12)并列间隔设置且分别竖直穿设于壳体(1)下端板上；所述第二端子(12)的上端横向设有弹性触片(2)，弹性触片(2)的活动端设于第一端子(11)的上方；其特征在于：所述壳体(1)内设有助力杆(3)，助力杆(3)外端与壳体(1)铰接；所述弹性触片(2)上设有弹力舌片(21)，弹力舌片(21)的自由端抵设于助力杆(3)里端上；所述助力杆(3)的外端设有与其呈“L”形一体结构的限行插板(31)，壳体(1)内设有与限行插板(31)配合的限位机构；所述助力杆(3)活动端的上侧面上设有托盘(33)，磁铁(4)设于托盘(33)和壳体(1)上端板之间，且磁铁(4)与托盘(33)固定连接。
  2. 根据权利要求1所述的助力型磁性接近开关，其特征在于：所述托盘(33)上端面设有安装口(34)，磁铁(4)下端穿设于安装口(34)内且与其为过盈配合。
  3. 根据权利要求2所述的助力型磁性接近开关，其特征在于：所述安装口(34)底面与托盘(33)上端面之间的高度差为A，磁铁(4)的高度为H，则A：H的比值范围在0.2-1之间。
  4. 根据权利要求1所述的助力型磁性接近开关，其特征在于：所述第一端子(11)上方的壳体(1)内侧壁上设有支点(13)，助力杆(3)的外端设有套环(32)，且套环(32)套设于支点(13)上与其转动配合；所述限行插板(31)设于套环(32)上，且限行插板(31)、套环(32)、助力杆(3)呈“L”形的一体结构。
  5. 根据权利要求4所述的助力型磁性接近开关，其特征在于：所述限位机构包括两个相对间隔设置的限位板(15)，两个限位板(15)均设于支点(13)上方，且两个限位板(15)之间的通槽开口指向支点(13)；所述限行插板(31)可活动地穿设于两个限位板(15)之间的通槽内。
  6. 根据权利要求5所述的助力型磁性接近开关，其特征在于：所述两个限位板(15)内侧面之间的间距为D，限行插板(31)的厚度为S，则D：S的比值范围在1.1-1.9之间；所述磁铁(4)随助力杆(3)转动的行程夹角为P，则P与D：S比值成正比。
  7. 根据权利要求1所述的助力型磁性接近开关，其特征在于：所述第一端子(11)上端设有横向的折页(16)，折页(16)上设有静触点(14)，弹性触片(2)的活动端设于折页(16)上方且弹性触片(2)上设有与静触点(14)配合的动触点(22)。
  8. 根据权利要求7所述的助力型磁性接近开关，其特征在于：所述折页(16)与助力杆(3)之间的壳体(1)内侧壁上设有“J”形的导弧条(17)，导弧条(17)横向设置且导弧条(17)的“J”形勾部与动触点(22)对应设置。
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