CN111755855B - A handle type grounding wire clamp and grounding wire installation method - Google Patents
A handle type grounding wire clamp and grounding wire installation method Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R11/00—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts
- H01R11/11—End pieces or tapping pieces for wires, supported by the wire and for facilitating electrical connection to some other wire, terminal or conductive member
- H01R11/12—End pieces terminating in an eye, hook, or fork
- H01R11/14—End pieces terminating in an eye, hook, or fork the hook being adapted for hanging on overhead or other suspended lines, e.g. hot line clamp
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
- H01R43/027—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for connecting conductors by clips
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Abstract
本发明公开了一种手柄式接地线夹和接地线架设方法，该接地线夹包括接地线夹，接地线夹的上颚设有上夹片，接地线夹的下颚一端设有下夹片，下颚中部设有推线凸起，接地线夹下端的操作杆上设有驱动部件，驱动部件驱动设于操作杆中的传动部件带动下颚水平运动，使得下颚、推线凸起靠近或远离上颚夹住或推开导线。本发明便于实现夹上接地线和取下接地线的工作，操作安全，固定稳定，使用方便，省时省力。
The invention discloses a handle type grounding wire clamp and a grounding wire erection method, the grounding wire clamp comprises a grounding wire clamp, the upper jaw of the grounding wire clamp is provided with an upper clamping piece, one end of the lower jaw of the grounding wire clamp is provided with a lower clamping piece, the middle part of the lower jaw is provided with a wire pushing protrusion, and the operating rod at the lower end of the grounding wire clamp is provided with a driving component, the driving component drives the transmission component arranged in the operating rod to drive the lower jaw to move horizontally, so that the lower jaw and the wire pushing protrusion are close to or away from the upper jaw to clamp or push away the wire. The invention facilitates the work of clamping and removing the grounding wire, has safe operation, stable fixation, convenient use, and saves time and effort.
Description
技术领域Technical Field
本发明属于电气工业技术领域，涉及一种手柄式接地线夹和接地线架设方法。The invention belongs to the technical field of electrical industry and relates to a handle type grounding wire clamp and a grounding wire installation method.
背景技术Background Art
目前，电力系统110kV、35kV电压等级变电所中电容器组、接地变等电气设备停电检修试验时，为了保证试验人员及设备安全，需要将相关设备停电并在设备各来电侧挂设接地线。At present, when electrical equipment such as capacitor banks and grounding transformers in 110kV and 35kV voltage level substations of the power system are shut down for maintenance and testing, in order to ensure the safety of test personnel and equipment, it is necessary to shut down the power to the relevant equipment and hang grounding wires on each incoming power side of the equipment.
由于受到电容器组、接地变柜等设备结构及安装位置的限制，在接地线挂设操作过程中常常会出现使用接地线操作杆无法规范、可靠、快速挂设接地线的问题，因而存在一定的安全隐患。Due to the limitations of the structure and installation location of equipment such as capacitor banks and grounding transformers, the grounding wire operating rod often cannot be used to hang the grounding wire in a standardized, reliable and fast manner during the grounding wire hanging operation, thus posing certain safety hazards.
现有的接地线夹常常需要转动，在使用过程中使用不够安全，而且操作较复杂，浪费时间。Existing grounding wire clamps often need to be rotated, which is not safe enough to use during use, and the operation is complicated and time-consuming.
发明内容Summary of the invention
针对上述问题，本发明一种手柄式接地线夹和接地线架设方法，操作更加方便快捷。本发明的技术方案具体如下：In view of the above problems, the present invention provides a handle-type grounding wire clamp and a grounding wire installation method, which are more convenient and quick to operate. The technical solution of the present invention is as follows:
一种手柄式接地线夹，包括接地线夹，接地线夹的上颚设有上夹片，接地线夹的下颚一端设有下夹片，下颚中部设有推线凸起，接地线夹下端的操作杆上设有驱动部件，驱动部件驱动设于操作杆中的传动部件带动下颚水平运动，使得下颚、推线凸起靠近或远离上颚夹住或推开导线。A handle type grounding wire clamp comprises a grounding wire clamp, wherein the upper jaw of the grounding wire clamp is provided with an upper clamping piece, one end of the lower jaw of the grounding wire clamp is provided with a lower clamping piece, the middle part of the lower jaw is provided with a wire pushing protrusion, and an operating rod at the lower end of the grounding wire clamp is provided with a driving component, and the driving component drives a transmission component arranged in the operating rod to drive the lower jaw to move horizontally, so that the lower jaw and the wire pushing protrusion are close to or away from the upper jaw to clamp or push away the wire.
进一步地，接地线夹的下颚设于腔室上，腔室上侧一部分设有滑轨，另一部分开口，呈板状的下颚沿滑轨水平运动，呈板状的下颚对应开口的部分设有锯齿，设于腔室中的绝缘齿轮通过锯齿带动下颚运动，传动部件上下运动，带动绝缘齿轮转动。Furthermore, the lower jaw of the grounding wire clamp is arranged on the chamber, a part of the upper side of the chamber is provided with a slide rail, and the other part is open, the plate-shaped lower jaw moves horizontally along the slide rail, and the part of the plate-shaped lower jaw corresponding to the opening is provided with serrations, and the insulating gear arranged in the chamber drives the lower jaw to move through the serrations, and the transmission component moves up and down, driving the insulating gear to rotate.
进一步地，传动部件为绝缘拉杆，绝缘拉杆设于操作杆中，绝缘拉杆沿操作杆内部滑动，绝缘拉杆顶端带有绝缘锯齿，通过绝缘锯齿带动绝缘齿轮转动。Furthermore, the transmission component is an insulating pull rod, which is arranged in the operating rod. The insulating pull rod slides along the inside of the operating rod. The top of the insulating pull rod is provided with insulating serrations, which drive the insulating gear to rotate through the insulating serrations.
进一步地，绝缘拉杆下端与操作杆底端之间设有弹簧，驱动部件带动绝缘拉杆上下运动。Furthermore, a spring is provided between the lower end of the insulating pull rod and the bottom end of the operating rod, and the driving component drives the insulating pull rod to move up and down.
进一步地，驱动部件包括设于操作杆上的手柄固定夹，手柄一端转动设于手柄固定架，手柄另一端附近设有手柄推杆滑道，手柄推杆连接手柄与绝缘拉杆，手柄推杆中部固定在操作杆上，握紧手柄，手柄推杆推动绝缘拉杆向上运动，松开手柄，绝缘拉杆向下滑动。Furthermore, the driving component includes a handle fixing clamp arranged on the operating rod, one end of the handle is rotatably arranged on the handle fixing frame, a handle push rod slide is provided near the other end of the handle, the handle push rod connects the handle and the insulating pull rod, the middle part of the handle push rod is fixed on the operating rod, and when the handle is held tightly, the handle push rod pushes the insulating pull rod to move upward, and when the handle is released, the insulating pull rod slides downward.
进一步地，操作杆的外部底端套有橡胶套，手柄固定夹设在橡胶套上。Furthermore, the outer bottom end of the operating rod is covered with a rubber sleeve, and the handle fixing clamp is arranged on the rubber sleeve.
进一步地，接地线夹侧面装有连接导线的导线螺丝。Furthermore, a wire screw for connecting the wire is arranged on the side of the grounding wire clamp.
进一步地，松开导线时，推线凸起将导线推出。Furthermore, when the wire is released, the wire-pushing protrusion pushes the wire out.
上述的接地线夹的接地线架设方法，按以下进行：The method for installing the grounding wire of the above-mentioned grounding wire clamp is as follows:
挂上接地线时，握紧手柄，手柄推杆滑道带动手柄推杆会向上推动绝缘拉杆，使绝缘拉杆向上运动，绝缘拉杆下端连接的弹簧被拉伸，同时拉杆顶端绝缘锯齿也会向上运动，带动绝缘齿轮顺时针旋转，绝缘齿轮又带动下颚向外侧移动，使上夹片与下夹片分开，此时将接地线挂在导线上；When hanging the grounding wire, hold the handle tightly, and the handle push rod slide will drive the handle push rod to push the insulating rod upward, so that the insulating rod moves upward, and the spring connected to the lower end of the insulating rod is stretched. At the same time, the insulating serrations at the top of the rod will also move upward, driving the insulating gear to rotate clockwise. The insulating gear drives the lower jaw to move outward, so that the upper clamping piece is separated from the lower clamping piece. At this time, the grounding wire is hung on the conductor;
然后松开手柄，被拉伸的弹簧会向下拉绝缘拉杆，使绝缘拉杆向下运动，拉杆顶端绝缘锯齿也会向下运动，并带动绝缘齿轮逆时针旋转，绝缘齿轮又带动下颚向内侧移动，使上夹片与下夹片将导线夹住。Then release the handle, the stretched spring will pull the insulating rod downward, causing the insulating rod to move downward, and the insulating serrations at the top of the rod will also move downward, driving the insulating gear to rotate counterclockwise, and the insulating gear will drive the lower jaw to move inward, causing the upper and lower clamps to clamp the wire.
进一步地，按以下进行：Further, proceed as follows:
取下接地线时，握紧手柄，手柄推杆滑道带动手柄推杆向上推动绝缘拉杆，使绝缘拉杆向上运动，绝缘拉杆下端连接的弹簧被拉伸，同时拉杆顶端绝缘锯齿向上运动，带动绝缘齿轮顺时针旋转，绝缘齿轮又带动下颚向外侧移动，使上夹片与下夹片分开，推线凸起将所夹导线推出，即可取下接地线。When removing the grounding wire, hold the handle tightly, and the handle push rod slide drives the handle push rod to push the insulating pull rod upward, so that the insulating pull rod moves upward, and the spring connected to the lower end of the insulating pull rod is stretched. At the same time, the insulating serrations on the top of the pull rod move upward, driving the insulating gear to rotate clockwise, and the insulating gear drives the lower jaw to move outward, so that the upper clamping piece is separated from the lower clamping piece, and the wire pushing protrusion pushes out the clamped wire, and the grounding wire can be removed.
本发明用腔体将绝缘齿轮固定，机械装置外壳固定在接地线夹上，并且机械装置外壳会把绝缘齿轮、拉杆顶端绝缘锯齿、下颚底部的锯齿保护起来，接地线夹下颚可在机械装置外壳上端左右滑动。The present invention fixes the insulating gear with a cavity, fixes the mechanical device housing on the grounding wire clamp, and the mechanical device housing protects the insulating gear, the insulating serrations at the top of the pull rod, and the serrations at the bottom of the lower jaw, and the lower jaw of the grounding wire clamp can slide left and right on the upper end of the mechanical device housing.
与现有技术相比，本发明的有益效果具体如下：Compared with the prior art, the beneficial effects of the present invention are as follows:
本发明通过按压手柄，巧妙的将握力转变成水平方向上的力，即可完成接地线的夹取，便于实现夹上接地线和取下接地线的工作，操作安全，固定稳定，使用方便，省时省力。The present invention can cleverly convert the gripping force into horizontal force by pressing the handle, so as to complete the clamping of the ground wire, facilitate the work of clamping and removing the ground wire, and has safe operation, stable fixation, convenient use, and time and labor saving.
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
为了易于说明，本发明由下述的具体实施及附图作以详细描述。For ease of explanation, the present invention is described in detail with reference to the following specific implementations and the accompanying drawings.
图1为本发明的结构示意图；Fig. 1 is a schematic diagram of the structure of the present invention;
图2为本发明中握紧手柄时的结构示意图；FIG2 is a schematic diagram of the structure of the present invention when the handle is tightly grasped;
图3为本发明中松开手柄时的结构示意图；FIG3 is a schematic diagram of the structure of the present invention when the handle is released;
图中：1-上颚；2-上夹片；3-绝缘锯齿；4-导线螺丝；5-接地线夹；6-绝缘拉杆；7-橡胶套；8-手柄推杆；9-弹簧；10-推线凸起；11-下夹片；12-下颚；13 –腔体；14-绝缘齿轮；15-操作杆；16-手柄固定夹；17-手柄；18-手柄推杆滑道。In the figure: 1-upper jaw; 2-upper clamp; 3-insulating serrations; 4-conductor screw; 5-grounding wire clamp; 6-insulating pull rod; 7-rubber sleeve; 8-handle push rod; 9-spring; 10-push wire protrusion; 11-lower clamp; 12-lower jaw; 13-cavity; 14-insulating gear; 15-operating rod; 16-handle fixing clamp; 17-handle; 18-handle push rod slide.
具体实施方式DETAILED DESCRIPTION
为使本发明的目的、技术方案和优点更加清楚明了，下面通过附图中示出的具体实施例来描述本发明。但是应该理解，这些描述只是示例性的，而并非要限制本发明的范围。此外，在以下说明中，省略了对公知结构和技术的描述，以避免不必要地混淆本发明的概念。In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.
除非另外定义，本申请实施例中使用的技术术语或者科学术语应当为所属领域内具有一般技能的人士所理解的通常意义。本实施例中使用的“第一”、“第二”以及类似的词语并不表示任何顺序、数量或者重要性，而只是用来区分不同的组成部分。“包括”或者“包含”等类似的词语意指出现该词前面的元件或者物件涵盖出现在该词后面列举的元件或者物件及其等同，而不排除其他元件或者物件。“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。“上”、“下”、“左”、“右”、“横”以及“竖”等仅用于相对于附图中的部件的方位而言的，这些方向性术语是相对的概念，它们用于相对于的描述和澄清，其可以根据附图中的部件所放置的方位的变化而相应地发生变化。Unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be understood by people with ordinary skills in the field. The words "first", "second" and similar words used in this embodiment do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Install", "connect", "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two elements. "Up", "down", "left", "right", "horizontal" and "vertical" are only used relative to the orientation of the components in the drawings. These directional terms are relative concepts. They are used for description and clarification relative to the components, and they can change accordingly according to the change of the orientation of the components in the drawings.
如图1所示，本实施例的手柄式接地线夹，包括上颚1、上夹片2、拉杆顶端绝缘锯齿3、导线螺丝4、接地线夹5、绝缘拉杆6、橡胶套7、手柄推杆8、弹簧9、推线凸起10、下夹片11、下颚12、腔体13、绝缘齿轮14、操作杆15、手柄固定夹16、手柄17和手柄推杆滑道18。As shown in Figure 1, the handle type grounding wire clamp of this embodiment includes an upper jaw 1, an upper clamping piece 2, insulating serrations 3 at the top of the pull rod, a wire screw 4, a grounding wire clamp 5, an insulating pull rod 6, a rubber sleeve 7, a handle push rod 8, a spring 9, a wire push protrusion 10, a lower clamping piece 11, a lower jaw 12, a cavity 13, an insulating gear 14, an operating rod 15, a handle fixing clamp 16, a handle 17 and a handle push rod slide 18.
接地线夹5的上颚1下部带有上夹片2，下颚12成板状，一端装有下片夹11，中部设有推线凸起10，下颚12底部带有锯齿，接地线夹5侧面装有导线螺丝4用于连接导线。下颚12设于腔室13上，腔室13上侧一部分设有滑轨，另一部分开口，呈板状的下颚12沿滑轨水平运动，呈板状的下颚12对应开口的部分设有锯齿。The upper jaw 1 of the grounding wire clamp 5 has an upper clamping piece 2 at the lower part, and the lower jaw 12 is plate-shaped, with a lower clamp 11 at one end, a wire pushing protrusion 10 in the middle, and a sawtooth at the bottom of the lower jaw 12. A wire screw 4 is installed on the side of the grounding wire clamp 5 for connecting the wire. The lower jaw 12 is arranged on the chamber 13, and a slide rail is arranged on a part of the upper side of the chamber 13, and another part is open. The plate-shaped lower jaw 12 moves horizontally along the slide rail, and the plate-shaped lower jaw 12 is provided with sawtooth at the corresponding opening part.
接地线夹5底部所连接的操作杆15内部装有绝缘拉杆6，绝缘拉杆6可在操作杆15内部滑动，绝缘拉杆15下端与操作杆6底端通过弹簧9连接，绝缘拉杆15顶端带有锯齿。An insulating pull rod 6 is installed inside the operating rod 15 connected to the bottom of the grounding clamp 5. The insulating pull rod 6 can slide inside the operating rod 15. The lower end of the insulating pull rod 15 is connected to the bottom end of the operating rod 6 through a spring 9. The top of the insulating pull rod 15 has serrations.
操作杆6的外部底端套有橡胶套7，在橡胶套7上又设有手柄固定夹16，手柄固定架16连接手柄17，手柄17上设有手柄推杆滑道18，手柄推杆8连接手柄17与绝缘拉杆6，手柄推杆8中部用螺丝固定在操作杆15上，使其握紧手柄17和松开手柄17可使绝缘拉杆6上下滑动。The outer bottom end of the operating rod 6 is covered with a rubber sleeve 7, and a handle fixing clamp 16 is provided on the rubber sleeve 7. The handle fixing frame 16 is connected to the handle 17, and a handle push rod slide 18 is provided on the handle 17. The handle push rod 8 connects the handle 17 and the insulating pull rod 6. The middle part of the handle push rod 8 is fixed to the operating rod 15 with a screw, so that the insulating pull rod 6 can slide up and down by holding the handle 17 and releasing the handle 17.
手柄推杆8一端设于手柄推杆滑道18中，该端可以设置拧紧螺丝，拧紧螺丝与手柄推杆8另一端的滑动块连接，使得手柄推杆8沿手柄推杆滑道18滑动，到适当位置时，将拧紧螺丝拧紧。作为本领域技术人员也能够知晓，本实施例还可以将手柄推杆8一端直接铰接在手柄17合适位置上。One end of the handle push rod 8 is arranged in the handle push rod slideway 18, and a tightening screw can be arranged on the end, and the tightening screw is connected to the sliding block at the other end of the handle push rod 8, so that the handle push rod 8 slides along the handle push rod slideway 18, and when it reaches a proper position, the tightening screw is tightened. Those skilled in the art can also know that in this embodiment, one end of the handle push rod 8 can also be directly hinged to a proper position of the handle 17.
拉杆顶端绝缘锯齿3穿过接地线夹5底部与绝缘齿轮14相连接，绝缘齿轮14还与下颚12底部的锯齿相连接，用机械装置外壳13将绝缘齿轮14固定，机械装置外壳13固定在接地线夹5上，并且机械装置外壳13会把绝缘齿轮14、拉杆顶端绝缘锯齿3、下颚12底部的锯齿保护起来，接地线夹5的下颚12可在机械装置外壳13上端左右滑动。The insulating serrations 3 at the top of the pull rod pass through the bottom of the grounding clamp 5 and are connected to the insulating gear 14. The insulating gear 14 is also connected to the serrations at the bottom of the lower jaw 12. The insulating gear 14 is fixed by a mechanical device housing 13. The mechanical device housing 13 is fixed on the grounding clamp 5, and the mechanical device housing 13 protects the insulating gear 14, the insulating serrations 3 at the top of the pull rod, and the serrations at the bottom of the lower jaw 12. The lower jaw 12 of the grounding clamp 5 can slide left and right on the upper end of the mechanical device housing 13.
基于上述接地线夹，本实施例的接地线架设方法按以下进行：Based on the above grounding wire clamp, the grounding wire installation method of this embodiment is performed as follows:
如图2、3所示，挂上接地线时，需握紧手柄17，手柄推杆滑道18带动手柄推杆8会向上推动绝缘拉杆6，使绝缘拉杆6向上运动，绝缘拉杆6下端连接的弹簧9此时会被拉伸，同时拉杆顶端绝缘锯齿3也会向上运动，带动绝缘齿轮14顺时针旋转，绝缘齿轮14又带动下颚12向外侧移动，使上夹片2与下夹片11分开，此时将接地线挂在导线上。As shown in Figures 2 and 3, when hanging the grounding wire, you need to hold the handle 17 tightly. The handle push rod slide 18 drives the handle push rod 8 to push the insulating pull rod 6 upward, so that the insulating pull rod 6 moves upward. The spring 9 connected to the lower end of the insulating pull rod 6 will be stretched at this time. At the same time, the insulating serrations 3 at the top of the pull rod will also move upward, driving the insulating gear 14 to rotate clockwise. The insulating gear 14 drives the lower jaw 12 to move outward, so that the upper clamp 2 is separated from the lower clamp 11. At this time, the grounding wire is hung on the conductor.
然后松开手柄17，被拉伸的弹簧9会向下拉绝缘拉杆6，使绝缘拉杆6向下运动，拉杆顶端绝缘锯齿3也会向下运动，并带动绝缘齿轮14逆时针旋转，绝缘齿轮14又带动下颚12向内侧移动，使上夹片2与下夹片11将导线夹住。Then release the handle 17, the stretched spring 9 will pull the insulating pull rod 6 downward, causing the insulating pull rod 6 to move downward, and the insulating serrations 3 at the top of the pull rod will also move downward, driving the insulating gear 14 to rotate counterclockwise, and the insulating gear 14 will drive the lower jaw 12 to move inward, so that the upper clamping piece 2 and the lower clamping piece 11 clamp the wire.
取下接地线时，握紧手柄17，手柄推杆滑道18带动手柄推杆8会向上推动绝缘拉杆6，使绝缘拉杆6向上运动，绝缘拉杆6下端连接的弹簧9被拉伸，同时拉杆顶端绝缘锯齿3也会向上运动，带动绝缘齿轮14顺时针旋转，绝缘齿轮14又带动下颚12向外侧移动，使上夹片2与下夹片11分开，推线凸起10将所夹导线推出，即可取下接地线。When removing the grounding wire, hold the handle 17 tightly, and the handle push rod slide 18 drives the handle push rod 8 to push the insulating pull rod 6 upward, so that the insulating pull rod 6 moves upward, and the spring 9 connected to the lower end of the insulating pull rod 6 is stretched. At the same time, the insulating serrations 3 at the top of the pull rod also move upward, driving the insulating gear 14 to rotate clockwise, and the insulating gear 14 drives the lower jaw 12 to move outward, so that the upper clamping piece 2 is separated from the lower clamping piece 11, and the wire pushing protrusion 10 pushes out the clamped wire, and the grounding wire can be removed.
以上显示和描述了本发明的基本原理和主要特征和本发明的优点。本行业的技术人员应该了解，本发明不受上述实施例的限制，上述实施例和说明书中描述的只是说明本发明的原理，在不脱离本发明精神和范围的前提下，本发明还会有各种变化和改进，这些变化和改进都落入要求保护的本发明范围内。本发明要求保护范围由所附的权利要求书及其等效物界定。The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.
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