WO2012146152A1 - 一种防拆装置和gps移动目标监控终端 - Google Patents

一种防拆装置和gps移动目标监控终端 Download PDF

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Publication number
WO2012146152A1
WO2012146152A1 PCT/CN2012/074461 CN2012074461W WO2012146152A1 WO 2012146152 A1 WO2012146152 A1 WO 2012146152A1 CN 2012074461 W CN2012074461 W CN 2012074461W WO 2012146152 A1 WO2012146152 A1 WO 2012146152A1
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WIPO (PCT)
Prior art keywords
ratchet
pawl
push rod
outer casing
elastic member
Prior art date
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Ceased
Application number
PCT/CN2012/074461
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English (en)
French (fr)
Inventor
周翔
李俊
杨栋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hunan Sany Intelligent Control Equipment Co Ltd
Sany Heavy Industry Co Ltd
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Hunan Sany Intelligent Control Equipment Co Ltd
Sany Heavy Industry Co Ltd
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Application filed by Hunan Sany Intelligent Control Equipment Co Ltd, Sany Heavy Industry Co Ltd filed Critical Hunan Sany Intelligent Control Equipment Co Ltd
Publication of WO2012146152A1 publication Critical patent/WO2012146152A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation

Definitions

  • the present invention relates to a tamper-removing device, and further to a GPS mobile target monitoring terminal equipped with the tamper-preventing device.
  • devices related to the control of construction machinery and equipment such as electronic control instruments, electric control boxes or GPS mobile target monitoring terminals, etc., because these devices and devices are more important, except for professionals, outsiders are not allowed to open and disassemble at will.
  • the tamper is installed on the device or device. Used to prevent disassembly and provide the manufacturer with information on whether or not there is disassembly.
  • the detachment device of the infrared radiation detector is mainly composed of a mounting bracket, a cover and an alarm circuit;
  • the mounting bracket is composed of a bottom plate and a vertical plate, and has an "L" shape, and the vertical plate is provided with a strip shape for fixing the cap
  • the hole has a fixing hole formed on the bottom plate, and a light-melting switch for controlling the alarm circuit is disposed on the bottom plate; a resilient contact is disposed in the cover corresponding to the position of the tact switch.
  • the other is a tamper-proof device for burglar alarms, including a push rod, a casing, an elastic member, a movable contact piece and a static contact piece, which are connected to an external circuit through a connecting wire, wherein one end of the pusher is extended through the small hole Out of the outer casing, the movable contact piece is fixedly integrated with the push sill, and the push rod is provided with an elastic member. Under the action of the elastic force, the push rod moves axially along the guide rail of the inner wall of the outer casing, and drives the movable contact piece and the static touch fixed in the outer casing.
  • the slice realizes the mutual conversion of the on and off states.
  • the push rod In the normal installation state, the push rod is supported by the inner wall of the periphery of the installation. When there is an external force, the periphery of the installation is disengaged, and when the pressure on the push rod is subsided, the push rod is displaced under the action of the elastic force to realize the movable contact piece and The change of the on-off state of the static contact piece triggers the alarm device and sends an alarm signal to achieve the purpose of tampering.
  • the structure also has the above disadvantages: The system cannot work under power failure, can be self-recoverable, and has no recording function.
  • the present invention provides a tamper-evident device using a ratchet structure, which not only serves the existing tamper-proof purpose, but also records the disassembled information and provides the manufacturer with disassembly record information.
  • the present invention also provides a GPS mobile target monitoring terminal mounted with the detaching device.
  • the invention provides a tampering device, comprising: a casing, a push rod, an elastic component for driving the push rod to move, and a wheel that is rotatable relative to the pusher, connected to the ratchet and has a resistance value with a ratchet A rotating variable resistor that resets the spine/reset element, the pusher body having drive teeth that mesh with the ratchet.
  • a reset element for resetting the pawl is further included.
  • the elastic member is a spring, and one end of the spring abuts against the outer casing, and the other end abuts against the push rod.
  • the body of the outer casing is provided with a through hole through which the push rod is extended, and the elastic member is used for driving the rod 412 to protrude from the through hole.
  • the ratchet is located in the outer casing and is rotatably coupled to the outer casing.
  • the resetting member is a spring piece, and one end of the elastic piece is fixed and the other end is abutted against the spine claw.
  • the one end of the pawl is rotatably connected to the outer casing, and the other end is abutted against the ratchet tooth by the elastic piece, and further comprises a positioning component, wherein the claw is located at the reset component Locating between components.
  • the body of the push rod is provided with an elastic element, one end of the elastic element abuts against the push rod body, and the other end abuts against the driving tooth, the driving tooth is in the ⁇
  • the top of the tooth is placed under the top of the pusher body and is reset under the top of the elastic element.
  • the present invention provides a GPS mobile object monitoring terminal, comprising a box body, a cover covering the box body, a GPS circuit system installed in the box body, and any one of the above items is also installed in the box body.
  • a GPS mobile object monitoring terminal comprising a box body, a cover covering the box body, a GPS circuit system installed in the box body, and any one of the above items is also installed in the box body.
  • the front end of the push rod abuts against the cover.
  • the GPS circuit system comprises a single chip, and the variable resistor is connected to a signal input terminal of the single chip machine.
  • the push rod is located in the outer casing, and the elastic member is in a compressed state.
  • the tampering device provided by the invention has the following beneficial effects: (1) a ratchet mechanism that uses a ratchet, a pawl and a driving tooth to mesh with each other, and once disassembled, the pusher pushes out the outer casing driven by the spring while driving The tooth drives the ratchet under the action of the push rod movement, and the rotating ratchet changes the resistance of the variable resistor, thereby providing a change signal for the control circuit. After the rotation, the ratchet is fixed by the positioning of the pawl, even if the system is powered off.
  • the MCU can also read the resistance signal changed by the variable resistor.
  • the tamper-removing device has a recording function, and it can record whether there is disassembly in the case of power failure, and the alarm can be recovered when one end is restored to the power supply;
  • a compression spring is arranged between the driving tooth and the push rod body, and the compression spring abuts against the driving tooth. In the initial state, the driving tooth meshes with the ratchet tooth under the top of the compression spring, and the movement of the pushing rod is The rotation of the ratchet is driven by the driving tooth.
  • the push rod When the push rod needs to be reset back to the original position, the push rod is moved downward, the ratchet tooth will abut against the driving tooth, and the compression spring is compressed, so that the push rod moves downward. After moving into position, the drive teeth are reset under the top of the compression spring.
  • the structure is elastically abutted by the compression spring, and is reset, which reduces the hard friction between the driving teeth and the ratchet teeth during the resetting, and prolongs the service life of the teeth.
  • the GPS moving target monitoring terminal has the beneficial effects that: the above-mentioned tamper-preventing device is installed in the box body, and the front end of the push rod is abutted against the lid of the box, and once the lid is disassembled and opened, the push rod is When the spring is extended, the driving gear will drive the ratchet to rotate, and the variable circuit signal changes.
  • the single-chip microcomputer in the GPS circuit system will "receive the change signal, and then issue corresponding control commands to prevent the GPS moving target monitoring terminal from being disassembled. If the disassembly occurs, record it in time and feedback the disassembly information.
  • FIG. 1 is a schematic view showing the overall structure of a tampering device of the present invention
  • FIG. 2 is a circuit diagram of a varistor accessing circuit in the tampering device of the present invention.
  • the technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.
  • a tamper-preventing device provided by the present invention includes a casing 2 and a casing 2 having a hollow structure.
  • the body is provided with a through hole 21 through which the push rod 1 can be extended, and the push rod 1 is disposed on the outer casing. 2, the front end thereof is opposite to the through bar 21 so as to extend out of the outer casing 2 from the through hole 21, and drive the elastic member 7 of the pusher 1 to move.
  • the elastic member 7 is a spring, which is placed on the push rod 1, and one end of the spring It abuts against the inner wall of the outer casing 2 and the other end abuts against the push rod 1.
  • a ratchet 3 rotatable relative to the push rod 1
  • a variable resistor 4 coupled to the ratchet 3 and having a resistance value that varies with the rotation of the ratchet wheel 3, resetting the reset element 6 of the pawl 5, the push
  • the body of the rod 1 has drive teeth n that mesh with the ratchet 3.
  • a ratchet 3 is located in the outer casing 2 and is rotatably coupled to the outer casing 2, and the rotational connection described herein is connected to the outer casing 2 via a pin shaft, which is rotatable by itself.
  • the resetting member 6 is a spring piece, and one end of the elastic piece is fixed on the outer casing 2, and the other end is abutted against the pawl 5.
  • One end of the pawl 5 is rotatably connected to the outer casing 2, and the other end is abutted against the ratchet 3 teeth under the action of the elastic piece, in order to prevent the pawl 5 from falling under the elastic piece and the ratchet 3
  • the tooth is disengaged, and is further provided with a positioning component.
  • the positioning component is a positioning post fixed on the outer casing 2 and located on one side of the pawl 5, and the pawl 5 is located between the elastic piece and the positioning post, when the pawl 5 is shrapnel When entering the ratchet 3, the other side of the pawl 5 abuts against the positioning post, and does not leave the ratchet 3 under the limit of the positioning post.
  • the rotation of the pawl 5 and the outer casing 2 is also connected to the outer casing through the pin shaft, and is rotatable by itself. The pawl 5 abuts against the teeth of the ratchet wheel 3 under the action of the resetting member 6.
  • the MCU can also read the resistance of the variable resistor 4, and the disassembly in the case of power failure can also be performed. Implement the record.
  • the body of the push rod 1 is provided with a compression spring, one end of the compression spring abuts against the push rod body 1 and the other end abuts against the driving tooth 11
  • the driving tooth 11 enters the body of the pusher 1 under the abutment of the teeth of the * wheel 3, and is reset under the top of the compression spring.
  • the structure facilitates the driving of the tooth 1 when the push rod 1 moves downwards, and does not cause hard friction with the ratchet tooth.
  • the structure is elastically abutted and reset by the compression spring, which is reduced in The hard friction between the tooth and the ratchet tooth is promoted during the reset to prolong the service life of the tooth.
  • the pawl 5 is soft-ended
  • Paws 5 can be used with steel sheets or other
  • the front end to the rear end of the claw gradually increase.
  • a GPS moving target monitoring terminal including a box body, a GPS circuit system that is attached to the box body and mounted in the box body, and the box body is further installed with the above-mentioned scheme.
  • the tampering device has a front end of the push rod 1 abutting against the cover.
  • the GPS circuit system includes a single chip microcomputer, and the variable resistor 4 is connected to a signal input terminal of the single chip microcomputer. In a state in which the cover is closed with the case, the push rod 1 is located in the outer casing 2, and the elastic member 7 is in a compressed state.
  • the front end of the push rod abuts against the lid, and after the lid is closed with the box body, the push rod is pressed into the outer casing of the tamper device by the lid, and the elastic member 7 is in a compressed state, once the lid is When the disassembly is opened, the push rod i is extended by the action of the spring, and the driving gear 11 drives the ratchet wheel 3 to rotate, and the variable circuit signal changes.
  • Discharge information specifically in the application, once the MCU receives the disassembled signal, the information is sent through the communication terminal. After receiving the information, the remote terminal knows that the device at the location is disassembled.
  • the GPS mobile target monitoring terminal is a well-known technology in the art, and the internal GPS circuit system provides the location information of the engineering machinery equipment. Once the GPS mobile target monitoring terminal is disassembled and damaged, the manufacturer loses the monitoring of the construction machinery state. Therefore, the mobile target monitoring terminal is equipped with a tamper-proof device, which can effectively prevent disassembly, and can record and feed back information in time even if disassembly occurs, thereby playing a monitoring role.
  • R1 and variable resistor 7 form a voltage divider loop.
  • the sampling voltage of R3 must be changed, thus driving the DI pin of the main control CPU.
  • Flat change After the main control CPU detects this change, it immediately records and local alarms, and simultaneously performs remote alarms and remote locks through the GPS module, from 3 ⁇ 4 to the purpose of tampering. Since the GPS mobile target monitoring terminal is a well-known technology in the art, and the improvement is that the above-mentioned tamper device is installed, those skilled in the art can realize the content described in the specification, so the structure and connection are not used here. The connection relationship and working principle are not described.
  • the specific installation structure is that the tamper device is installed in the box of the monitoring terminal.
  • the push rod 1 is located at the connection between the box and the cover. The rod 1 abuts against the lid, and once the lid is removed and opened, the pusher 1 can be extended by the elastic member 7 to produce a subsequent action.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Position Fixing By Use Of Radio Waves (AREA)
  • Burglar Alarm Systems (AREA)

Description

—种方拆装置和 GPS移动目标监控终端 本申请要求于 2011 年 04 月 29 日提交中国专利局、 申请号为 201110109502.4, 发明名称为"一种防拆装置和 GJPS移动 标监控终端"的 中国专利申请的优先权， 其全部内容通过引用结合在本申请中。
技术领域
本发明涉及一种防拆装置， 另外本发明还涉及一种安装有该防拆装置 的 GPS移动目标监控终端。
背景技术
目前，在工程机械领域，与工程机械设备控制有关的装置如电控仪表、 电控箱或是 GPS移动目标监控终端等， 由于这些设备、 装置较为重要， 除 专业人员， 外人不得随意打开、 拆卸。 为了防止用户自行打开造成损坏， —般都会在设^^或装置上安装防拆装置。 用于防止拆卸并对厂家提供是否 存在拆卸的信息。
目前， 较为常用的防拆机构有如下两种机构。
红外线对射探测器的防拆装置， 主要由安装支架、 罩盖和报警电路组 成； 该安装支架由底板和竖板构成， 呈" L "形， 竖板上开有用于固定管帽 的条形孔， 底板上开有固定用孔， 底板上设置有一用于控制报警电路的轻 融开关； 该罩盖内对应于轻触开关位置处设置有一弹性触头。 一旦罩盖从 安装支架上脱离， 轻触开关动作， 就会触发报警电路， 发出警报声。 其缺 点是： 系统掉电情况下无法工作， 可自恢复， 无记录功能。
另外一种是， 一种防盗报警器的防拆装置， 包括推杆、 外壳、 弹性部 件， 动触片和静触片， 通过连接导线与外部电路连接， 其中推.梓的一端通 过小孔伸出外壳， 动触片与推軒固定为一体， 推杆配有弹性部件， 在弹力 的作用下， 推杆沿外壳内壁的导轨做轴向运动， 带动动触片与固定在外壳 内的静触片实现接通和分断状态的相互转换。 在正常安装状态下， 推杆被 设施的周边内壁顶住， 当有外力， 导致设施的周边脱离， 周边对推杆的压 力消退时， 推杆在弹力的作用下产生位移， 实现动触片和静触片通断状态 的改变， 从而触发报警装置， 发出报警信号， 以达到防拆的目的。 该结构 也存在上述缺点： 系统掉电情况下无法工作， 可自恢复， 无记录功能。 发明内容 为了克服现有技术的上述缺陷和不足， 本发明提供一种防拆装置 采 用棘轮结构， 不仅起到现有的防拆目的， 而且可以记录拆卸的信息， 为厂 家提供拆卸记录信息。
另外， 本发明还提供一种安装有该拆卸装置的 GPS 移动目标监控终 端。
本发明提供的一种防拆装置， 包括外壳、 推杆、 驱动所述推杆移动的 弹性部件， 还包括可相对于所述推軒转动的 ^轮、 与所述棘轮连接且阻值 随棘轮转动而变化的可变电阻， 复位所述棘/ 的复位元件， 所述推杆的本 体上具有与所述棘轮相啮合的驱动齿牙。
优选的， 还包括复位所述棘爪的复位元件。
优选的， 所述弹性部件为弹簧， 所述弹簧的一端顶靠于所述外壳， 另 —端顶靠于所述推杆。
优选的， 所述外壳的本体开有可使所述推杆伸出的通孔， 所述弹性部 件用于驱动所述 41¾杆伸出所述通孔。
优选的 , 所述棘轮位于所述外壳中 , 并与所述外壳转动连接。
优选的， 所述复位件为弹片， 所述弹片的一端固定、 另一端顶靠于所 述棘.爪。
铌选的， 所述.棘爪的一端与所述外壳转动连接、 另一端在所述弹片的 作用下顶靠于所述.棘轮齿牙中， 还包括定位元件， 所述 爪位于复位元件 与定位元件之间。
铌选的， 所述.推杆的本体设有弹性元件， 所述弹性元件的一端顶靠于 所述推杆本体、 另一端顶靠于所述驱动齿牙， 所述驱动齿牙在所述^轮齿 牙的顶靠下进入所述推杆本体、 在所述弹性元件的顶靠下复位。
本发明提供的一种 GPS移动目标监控终端， 包括盒体、 与所述盒体盖 合的盒盖， 安装于所述盒体中的 GPS电路系统， 盒体中还安装有上述任一 项所述的防拆装置， 所述推杆的前端顶靠于盒盖。
优选的， 所述 GPS电路系统包括单片机， 所述可变电阻接入所述单片 机的信号输入端脚。
优选的， 所述盒盖与所述盒体盖合的状态下， 所述推杆位于所述外壳 中， 所述弹性部件处于压缩状态。 本发明提供的一种防拆装置具有的有益效果为： （1 )采用棘轮、棘爪、 驱动齿牙相互啮合的棘轮机构， 一旦发生拆卸， 推梓在弹簧的驱动下伸出 外壳， 同时驱动齿牙在推杆移动的作用下驱动棘轮转动， 转动的棘轮会改 变可变电阻的阻值， 从而为控制电路提供变化的信号， 转动后棘轮由由于 棘爪的定位作用而固定， 即便系统停电， 恢复后单片机也可读出可变电阻 改变的阻值信号。 使防拆装置具有记录功能， 能够在断电的情况下记录是 否有拆卸情况， 一端恢复供电即可报警； 带电工作情况下， 发生拆卸即可 报警。 （2 )驱动齿牙与推杆本体之间设有压缩弹簧， 压缩弹簧顶靠驱动齿 牙， 在初始状态下驱动齿牙在压缩弹簧的顶靠下与棘轮齿牙啮合， 推杆的 移动就会通过驱动齿牙驱动棘轮的转动， 当推杆需要复位回到原位时， 向 下移动推杆， 棘轮齿牙就会顶靠驱动齿牙， 压缩弹簧被压缩， 便于推杆向 下移动。 移动到位后， 驱动齿牙在压缩弹簧的顶靠下复位。 该结构由压缩 弹簧进行弹性顶靠， 复位， 减少了在复位时驱动齿牙与棘 ^齿牙的硬性摩 擦， 延长齿牙的使用寿命。
本发明提供的一种 GPS移动目标监控终端具有的有益效果为：在盒体 中安装上述的防拆装置，且推杆前端顶靠在盒盖上，一旦盒盖被拆卸打开， 推杆即在弹簧的作用下伸出， 驱动齿轮就会带动棘轮转动， 可变电路信号 发生变化， GPS电路系统中的单片机就会 "收到变化信号， 从而发出相应 的控制指令 防止 GPS移动目标监控终端被拆卸， 如发生拆卸及时记录并 反馈拆卸信息。
附圑说明
图 1为本发明防拆装置的整体结构示意图； 图 2为本发明防拆装置中可变电阻接入电路的电路图。 下面将结合本发明实施例中的附图， 对本发明实施例中的技术方案进 行清楚、 完整地描述， 显然， 所描述的实施例仅仅是本发明一部分实施例， 而不是.全部的实施例。 基于本发明中的实施例， 本领域普通技术人员在没 有作出创造性劳动前提下所获得的所有其他实施例， 都属于本发明保护的 范围。 如图 i所示， 为本发明提供的一种防拆装置， 包括外壳 2、 外壳 2为 中空结构，本体开有可使所述推杆 1伸出的通孔 21，推杆 1设于外壳 2中， 其前端与通扎 21相对， 以便于从通孔 21伸出外壳 2, 驱动所述推衧 1移 动的弹性部件 7， 弹性部件 7为弹簧， 套在推杆 1上， 弹簧的一端顶靠于 所述外壳 2的内壁上， 另一端顶靠于所述推杆 1。 还包括可相对于所述推 杆 1转动的棘轮 3、 与所述棘轮 3连接且阻值随棘轮 3转动而变化的可变 电阻 4 , 复位所述棘爪 5的复位元件 6， 所述推杆 1的本体上具有与所述棘 轮 3相啮合的驱动齿牙 n。
如图 1所示， 棘轮 3位于所述外壳 2中， 并与所述外壳 2转动连接， 这里所述的转动连接就是通过销轴与外壳 2连接， 其自身可转动。 所述复 位件 6为弹片， 所述弹片的一端固定在外壳 2上、 另一端顶靠于所述棘爪 5。所述棘爪 5的一端与所述外壳 2转动连接、另一端在所述弹片的作用下 顶靠于所述棘轮 3齿牙中， 为了防止棘爪 5在弹片的顶靠下与棘轮 3的齿 牙脱开， 还设有定位元件， 该定位元件为一定位柱， 固定于外壳 2上并位 于棘爪 5的一侧， 棘爪 5位于弹片和定位柱之间， 当棘爪 5被弹片顶靠进 入棘轮 3时， 棘爪 5的另一侧顶靠于定位柱， 在定位柱的限位下不会离开 棘轮 3。 棘爪 5与外壳 2的转动也是通过销轴与外壳连接， 自身可转动， 棘爪 5在复位件 6的作用下顶靠在棘轮 3的齿牙， 当棘轮 3转动时， 棘轮 3的齿牙会将棘爪 5顶出， 当棘轮停止转动后， 棘爪 5又在复位件 6的弹 力作用下重新进入棘轮 3的齿牙， 顶靠定位。 此时不论推籽是否复位， 都 不会对棘轮 3的转动产生影响， 因此当停电重新上电后， 单片机也可读取 可变电阻 4变化的阻值， 在断电情况下的拆卸也可实现记录。
在另一优选的实施例中， 所述推杆 1的本体设有压缩弹簧， 所述压缩 弹簧的一端顶靠于所述推杆本体 1、 另一端顶靠于所述驱动齿牙 11， 所述 驱动齿牙 1 1在所述*轮 3齿牙的顶靠下进 _入所述推衧 1本体、在所述压缩 弹簧的顶靠下复位。 该结构便于推杆 1向下移动时，驱动齿牙 1 !不会与棘 轮齿牙发生硬性摩擦， 相比上面的实施例而言， 该结构由压缩弹簧进行弹 性顶靠、 复位， 减少了在复位时驱动齿牙与棘轮齿牙的硬性摩擦， 延长齿 牙的使用寿命。 于， 棘爪 5采用软 端固
可弹性弯曲并复位，棘轮 3转动时齿牙拨动棘爪 5的前端，使其前端弯曲 当停止转动后， 棘爪 3的前端
棘爪 5可釆用钢片或其他具有
在定位时的强度， 防止棘轮 3
Figure imgf000007_0001
爪的前端至后端逐渐增大。
除了上述防拆装置的 提供一种 GPS移动目标监控 终端， 包括盒体、 与所述盒体盖合 ， 安装于所述盒体中的 GPS电路 系统， 盒体中还安装有上述方案中所述的防拆装置， 所述推杆 1的前端顶 靠于盒盖。 所述 GPS电路系统包括单片机， 所述可变电阻 4接入所述单片 机的信号输入端脚。 所述盒盖与所述盒体盖合的状态下， 所述推杆 1位于 所述外壳 2中， 所述弹性部件 7处于压缩状态。 在实际应用中 , 推杆前端 顶靠在盒盖上， 盒盖与盒体盖合后，推杆即被盒盖压入防拆装置的外壳中， 弹性元件 7处于压缩状态， 一旦盒盖被拆卸打开， 推杆 i即在弹簧的作用 下伸出， 驱动齿轮 11就会带动棘轮 3转动， 可变电路信号就会发生变化，
Figure imgf000007_0002
卸信息， 具体在应用中， 一旦单片机接收到拆卸的信号， 即通过通信终端 发出信息， 远程终端接收到信息后即了解该位置的设备被拆卸。
GPS移动目标监控终端为本领域公知的技术，内部的 GPS电路系统提 供工程机械设备所处的位置信息，一旦 GPS移动目标监控终端被拆卸发生 损坏后， 厂家就失去了对工程机械状态的监控， 因此该移动目标监控终端 安装防拆装置， 能够有效的防止拆卸， 即便拆卸出现也可及时记录并反馈 信息， 起到监控的作用。
如图 2所示， R1和可变电阻 7 (即图中 R2 )构成一个分压回路， 当 R2的阻值变化时必然使 R3的采样电压发生改变， 从而带动主控 CPU的 DI引脚电平的变化。 主控 CPU检测到这种变化后, 马上进行记录和本地 报警， 同时通过 GPS模块进行远程报警和远程锁机等， 从, ¾达到防拆的目 的。 由于 GPS移动目标监控终端为本领域公知的技术，且改进点在于安装 有上述的防拆装置， 本领域技术人员在说明书记载的内容的基础上就可实 现， 故这里不再对其结构、 连.接关系、 工作原理进 _行赘述， 也没有给出 图， 具体安装结构是， 防拆装置整体安装在监控终端的盒体内， 推杆 1位 于盒体与盒盖的连接处， 具体就是推杆 1与盒盖相抵靠， - 旦盒盖被拆卸 打开， 推衧 1即可在弹性部件 7的作用下伸出， 产生后续的动作。
以上所述仅为本发明的较佳实施例而已， 并不用以限制本发明， 凡在 本发明的精神和原则之内， 所作的任何修改、 等同替换、 改进等， 均应包 含在本发明的保护范围之内。

Claims

1、 一种防拆装置， 包括外壳 （2)、 推軒（1)、 驱动所述推杆（1 )移 动的弹性部件（7)， 其特征在于： 还包括可相对于所述推杆 ( 1 )转动的棘 轮（3)、 与所述棘轮 (3)连接且阻值随棘轮（3)转动 变化的可变电阻 ( 4 )、 定位棘轮（ 3 ) 的棘爪（ 5 )、 所述推衧 ( 1 ) 的本体上具有与所述棘 轮（3 )相啮合的驱动齿牙 ( 11 )。
2、根据权利要求 1所述的防拆装置， 其特征在于： 还包括复位所述棘 爪（5) 的复位元件 （6)。
3、根据权利要求 1或 2所述的防拆装置， 其特征在于： 所述弹性部件 (7)为弹簧， 所述弹簧的一端顶靠于所述外壳（2), 另一端顶靠于所述推 杆 ( 1 )。
4、 根据权利要求 3所述的防拆装置， 其特征在于： 所述外壳 （2) 的 本体开有可使所述推杆（ I )伸出的通孔（ 21 )， 所述弹性部件（ 7 )用于驱 动所述推軒 ( 1 )伸出所述通孔（21 )。
5、 根据权利要求 4所述的防拆装置， 其特征在于： 所述棘轮（3)位 于所述外壳 （2) 中， 并与所述外壳 （2)转动连接。
6, 根据权利要求 5所述的防拆装置， 其特征在于： 所述复位件 （6) 为弹片， 所述弹片的一端固定、 另一端顶靠于所述 爪 ( 5 )。
7, 根据权利要求 6所述的防拆装置， 其特征在于： 所述棘爪（5) 的 —端与所述外壳（2)转动连接， 另一端在所述弹片的作用下顶靠于所述.棘 轮（3)齿牙中，还包括定位元件， 所述棘爪位于复位元件与定位元件之间。
8. 根据权利要求 1、 3至 7任一项所述的防拆装置， 其特征在于： 所 述推軒 ( 1 )的本体设有弹性元件， 所述弹性元件的一端顶靠于所述推杆本 体（ 1 )、 另一端顶靠于所述驱动齿牙 ( 11 )， 所述驱动齿牙（ 11 )在所述棘 轮（ 3 )齿牙的顶靠下进入所述推軒 ( 1 )本体、 在所述弹性元件的顶靠下 复位。
9、 一种 GPS移动目标监控终端， 包括盒体、 与所述盒体盖合的盒盖， 安装于所述盒体中的 GPS电路系统， 其特征在于： 盒体中还安装有上述权 利要求 1至 7任一项所述的防拆装置， 所述推杆（ 1 ) 的前端顶靠于盒盖。
10、 根据权利要求 9所述的 GPS移动目标监控终端， 其特征在于： 所 述 GPS电路系统包括单片机， 所述可变电阻（4 )接入所述单片机的信号 输入端脚。
11、 根据权利要求 9所述的 GPS移动目标监控终端， 其特征在于： 所 述盒盖与所述盒体盖合的状态下， 所述推軒 ( 1 )位于所述外壳 （2 ) 中， 所述弹性部件 （7 )处于压缩状态。
12、 根据权利要求 9所述的 GPS移动目标监控终端， 其特征在于： 所 述推杆顶靠的盒盖部分与所述盒体分离时， 所述弹性部件驱动所述推杆移 动。
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