WO2023197697A1 - 一种烧草机 - Google Patents

一种烧草机 Download PDF

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Publication number
WO2023197697A1
WO2023197697A1 PCT/CN2022/143885 CN2022143885W WO2023197697A1 WO 2023197697 A1 WO2023197697 A1 WO 2023197697A1 CN 2022143885 W CN2022143885 W CN 2022143885W WO 2023197697 A1 WO2023197697 A1 WO 2023197697A1
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WO
WIPO (PCT)
Prior art keywords
grass
burning
housing
electromagnetic coil
operating rod
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PCT/CN2022/143885
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English (en)
French (fr)
Inventor
杨伟明
帕伊斯·雷蒙德
Original Assignee
浙江普莱得电器股份有限公司
巴达维亚有限公司
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Priority claimed from CN202220884942.0U external-priority patent/CN218831726U/zh
Priority claimed from CN202210414089.0A external-priority patent/CN114794071B/zh
Application filed by 浙江普莱得电器股份有限公司, 巴达维亚有限公司 filed Critical 浙江普莱得电器股份有限公司
Publication of WO2023197697A1 publication Critical patent/WO2023197697A1/zh

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    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01M—CATCHING, TRAPPING OR SCARING OF ANIMALS; APPARATUS FOR THE DESTRUCTION OF NOXIOUS ANIMALS OR NOXIOUS PLANTS
    • A01M21/00—Apparatus for the destruction of unwanted vegetation, e.g. weeds
    • A01M21/04—Apparatus for destruction by steam, chemicals, burning, or electricity
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/36—Coil arrangements

Definitions

  • the present invention relates to equipment for eliminating useless plants, in particular to a lawn burner.
  • the authorization announcement number is CN209643668U, which discloses a windless grass burning machine, including an operating lever 100, a power supply device 200 and a heating device.
  • the power supply device 200 is provided on the operating rod 100 and is used to provide power to the heating element 300.
  • the heating element 300 is provided at the bottom end of the operating rod 100 and is electrically connected to the power supply device 200.
  • the windless grass burning machine also includes a grass burning part located at the bottom of the operating rod 100. The grass burning part is located outside the heating element 300.
  • the working temperature of the heating element 300 after being energized is 200°C to 600°C.
  • the heating element is energized and heated during the working process, and the heated heat is released with the assistance of the weed burning part to burn the weeds at high temperature.
  • the weeds are dehydrated and cooked under the high temperature, thereby achieving weeding. Since the blades and rhizomes of weeds will be dehydrated under high temperature, it is beneficial to improve the weeding effect.
  • the heating element 300 can use a heating rod or a heating wire, but they all use a resistance heating method. The thermal efficiency of the resistance heating method is low, and the resistance wire is easily damaged by high-temperature oxidation, requiring regular maintenance, and the maintenance cost is high.
  • the object to be achieved by the present invention is to provide a grass burning machine to extend the service life and reduce the use cost.
  • a grass burning machine including an operating rod, a grass burning part, a housing and a heater.
  • the grass burning part is connected to the operating rod, the operating rod is movably connected to the housing, and the heater It includes an electromagnetic coil, and the electromagnetic coil is fixed on the shell.
  • the grass burning part includes a magnetic conductor that can be electromagnetically heated.
  • the grass burning part has a heating position where the magnetic conductor is located inside the electromagnetic coil for heating, and the magnetic conductor is located outside the electromagnetic coil for burning grass. position, the working temperature of the magnet is not lower than 200°C.
  • the housing includes a sheath placed around the periphery of the grass-burning component.
  • the front end of the sheath is provided with a through hole for the grass-burning component to pass through, and the electromagnetic coil is fixed in the sheath.
  • the sheath is a heat-insulating sheath.
  • an elastic member is provided between the operating rod and the housing to enable the grass-burning member to maintain a tendency to be in the heating position.
  • the elastic member is sleeved on the outer periphery of the operating lever.
  • the operating lever is provided with a positioning boss and a movable gasket.
  • the rear end of the elastic member is against the positioning boss and the front end is against the movable gasket.
  • the movable gasket is provided with a limiter.
  • the convex rib, the shell is provided with a limiting groove that cooperates with the limiting convex rib to position the movable gasket.
  • the front end of the housing is provided with a support frame that can position the housing against the ground, and the operating rod moves relative to the housing to bring the grass-burning member into the working position; or, the housing is provided with a support frame for the user to apply force.
  • the operating part the shell moves relative to the operating rod, so that the grass burning part enters the working position.
  • the magnetic conductor is located at the front end of the grass-burning member; or, the grass-burning member is made of a magnetic conductor.
  • the housing is provided with a normally open safety switch.
  • the safety switch is used to control the electromagnetic coil to be connected or disconnected from the power supply.
  • the operating lever is provided with a trigger part. The trigger part closes the safety switch when the grass-burning part is in the heating position. .
  • the safety switch is a micro switch, and the triggering part is a protruding rib; or the safety switch is a magnetic induction switch, and the triggering part is a magnet.
  • the housing is provided with a circuit board that controls the operation of the electromagnetic coil; and/or the housing is provided with a battery that supplies power to the electromagnetic coil.
  • the present invention has the following advantages: the electromagnetic heating method is used to quickly heat the magnetic conductor. Since the magnetic conductor itself generates heat, the heat conversion rate is particularly high. The grass-burning part can quickly reach the target temperature, improving the efficiency of burning grass. The use efficiency of the machine fundamentally solves the problem of low thermal efficiency of the resistance wire heating method; because the electromagnetic coil itself basically does not generate heat, the service life can be as long as 10 years, basically no maintenance is required, and there is no maintenance and replacement cost.
  • the electromagnetic coil itself does not generate heat, has small thermal blockage and low thermal inertia, which is conducive to real-time and accurate control of the temperature of the magnetic conductor, and is conducive to improving the quality of the lawn mower; the electromagnetic coil can be wound with high temperature and high pressure resistant cables, which is better than resistance In terms of wire, it is very convenient to process, has good insulation performance, and does not need to be in direct contact with the magnetic conductor. There is basically no possibility of leakage, and it is safe and worry-free; the grass burning part has a heating position and a working position.
  • the magnetic conductor Retracting into the electromagnetic coil to avoid exposure of the magnet conductor can form a certain degree of protection for the magnet conductor to avoid damage due to accidental bumps.
  • the magnet conductor will move to the outside of the electromagnetic coil. Therefore, the magnetic conductor is heated to a high temperature at the heating position and is not easily accessible to the user. At the same time, it is convenient to install a heat-insulating sheath outside the electromagnetic coil to further improve the safety during use of the lawn burner.
  • Figure 1 is a schematic structural diagram of a grass burning machine according to the present invention.
  • Figure 2 is a cross-sectional view of a grass burning machine according to the present invention.
  • Figure 3 is an exploded view of the operating rod, elastic parts, grass burning parts, heater and sheath in a grass burning machine according to the present invention
  • Figure 4 is a schematic diagram of the inside of the casing of a grass burning machine according to the present invention.
  • FIG. 5 is a cross-sectional view along the A-A direction in FIG. 4 .
  • the size of the sequence numbers involved in each process does not mean the order of execution.
  • the execution order of each process should be determined by its function and internal logic, and should not be used in the present invention.
  • the implementation of the examples does not constitute any limitations.
  • pluricity means two or more.
  • “And/or” is just an association relationship that describes related objects. It means that there can be three kinds of relationships.
  • X and/or Y can mean: X exists alone, X and Y exist at the same time, and Y exists alone.
  • the character “/” generally indicates that the related objects are in an “or” relationship.
  • “Includes "Including X, Y and/or Z” means including any one, two or three of X, Y and Z.
  • the invention provides a grass burning machine, as shown in Figures 1 to 3, including an operating lever 1, a grass burning part 2, a housing 3 and a heater.
  • the grass burning part 2 is connected to the operating lever 1, and the operating lever 1 is connected to the shell.
  • the body 3 is movably connected, the heater includes an electromagnetic coil 4, and the electromagnetic coil 4 is fixed to the housing 3.
  • the grass burning member 2 includes a magnetic conductor that can be electromagnetically heated.
  • the grass burning member 2 has a magnetic conductor located in the electromagnetic coil 4 for heating.
  • the position and the magnetizer are located outside the electromagnetic coil 4 in the working position for burning grass. As shown in Figure 1, it is in the heating position.
  • the working temperature of the magnetizer is not lower than 200°C.
  • it can be controlled at Suitable temperatures include 200°C, 240°C, 300°C, 350°C, 400°C or 500°C. Because of the electromagnetic heating method, the controllability of the heating temperature of the grass-burning part 2 is improved.
  • the present invention uses electromagnetic heating to rapidly heat the magnetic conductor. Since the magnetic conductor itself generates heat, the heat conversion rate is particularly high. The grass burning part 2 can quickly reach the target temperature, thereby improving the efficiency of the grass burning machine and fundamentally solving the problem. The problem of low thermal efficiency of the resistance wire heating method is solved; because the electromagnetic coil 4 itself basically does not generate heat, the service life can be as long as 10 years, basically does not require maintenance, and there is no maintenance and replacement cost.
  • the electromagnetic coil 4 itself does not generate heat, the heat Small hysteresis and low thermal inertia are conducive to real-time and accurate control of the temperature of the magnet, and are conducive to improving the quality of the lawn mower; the electromagnetic coil 4 can be wound with high temperature and high pressure resistant cables. Compared with resistance wires, the processing is very difficult. It is convenient and has good insulation performance. At the same time, it does not need to be in direct contact with the magnetic conductor, and there is basically no possibility of leakage. It is safe and worry-free; the grass burning part 2 has a heating position and a working position.
  • the magnetic conductor retracts to the electromagnetic Inside the coil 4, the magnet conductor can be prevented from being exposed, which can form a certain degree of protection for the magnet conductor and avoid damage due to accidental bumps.
  • the magnet conductor will move to the outside of the electromagnetic coil 4, so The magnetic conductor is heated to a high temperature at the heating position and is not easily accessible by the user. At the same time, it is convenient to install a heat-insulating sheath outside the electromagnetic coil 4 to further improve the safety during use of the lawn burner.
  • the housing 3 can be designed to include a sheath 31 that is placed around the periphery of the grass burning element 2.
  • the front end of the sheath 31 is provided with a grass burning element. 2 passes through the through hole, and the electromagnetic coil 4 is fixed in the sheath 31.
  • the sheath 31 can be made of heat insulating material to further improve the safety during use of the grass burning machine.
  • a damping structure can be provided between the operating rod 1 and the housing 3.
  • the operating rod 1 is covered with a rubber sleeve, and the rubber sleeve is fixed to the housing 3. Through the rubber The friction between the sleeve and the operating rod 1 keeps the grass-burning part 2 in the heating position or the working position.
  • an elastic member 32 can be provided between the operating rod 1 and the housing 3 to maintain the tendency of the grass burning element 2 in the heating position to avoid the user forgetting. The situation of resetting the grass burning element 2 from the working position to the heating position. After the user inserts the grass-burning part 2 into the soil to kill the plants, the elastic force of the elastic member 32 can be used to automatically withdraw the grass-burning part 2 from the soil, which makes the user's operation more labor-saving. In this case, there is no need for a damping structure. The elastic force of the elastic member 32 can keep the grass burning element 2 in the heating position, and the user's force can keep the grass burning element 2 in the working position.
  • the elastic member 32 can be common parts such as springs or spring washers.
  • the elastic member 32 is sleeved on the outer periphery of the operating rod 1.
  • a positioning device can be provided on the operating rod 1.
  • the boss 11 and the movable gasket 33 have the rear end of the elastic member 32 against the positioning boss 11 and the front end against the movable gasket 33.
  • the movable gasket 33 is provided with a limiting rib 331, and the housing 3 is provided with a limiting convex rib.
  • the ribs 331 cooperate with the limiting grooves 301 that position the movable gasket 33 (which can be provided on the sheath 31 as shown in Figures 3 to 5).
  • the movable gasket 33 can be removed from the operating rod 1 to facilitate the installation of the elastic member 32. It can be understood that the front end of the elastic member 32 can also directly abut against the housing 3 or the sheath 31 , and a corresponding positioning structure is provided on the housing 3 or the sheath 31 .
  • a support frame 5 can be provided at the front end of the housing 3 to position the housing 3 against the ground, and the operating lever 1 Move relative to the housing 3, so that the grass-burning part 2 enters the working position, that is, the user exerts force on the operating lever 1 to drive the grass-burning part 2 to move relative to the electromagnetic coil 4. Since the user himself needs to exert force to insert the grass-burning part 2 into the soil, Therefore, it can be integrated into one operation to complete the switching of the grass burning part 2 from the heating position to the working position and insertion into the soil, making the operation process smoother. It can be understood that it is also feasible to allow the housing 3 to move relative to the operating rod 1 in reverse.
  • the housing 3 is provided with an operating part for the user to apply force. Before inserting the grass burning element 2 into the soil, the user first applies force to the Move the housing 3 on the operating part to bring the grass-burning part 2 into the working position, and then insert the grass-burning part 2 into the soil.
  • the magnetic conductor can be designed to be located at the front end of the grass burning member 2, and other parts of the grass burning member 2 can be made of materials that are not magnetically conductive. In this way, when the grass burning element 2 enters the working position, the electromagnetic heating is suspended, which can play a certain energy saving role. It can be understood that if the grass burning member 2 still needs to continue to be heated after entering the working position, in another embodiment, the grass burning member 2 can be made entirely or mostly made of a magnetic conductor. After 2 enters the working position, there is still a magnetic conductor located in the electromagnetic coil 4, so that the grass burning element 2 can continue to heat.
  • a normally open safety switch can be provided in the housing 3, and the safety switch is used to control the electromagnetic coil. 4 is connected or disconnected from the power supply, and the operating lever 1 is provided with a trigger part, which closes the safety switch when the grass burning element 2 is in the heating position.
  • the safety switch can be a micro switch, and the trigger part is a protruding rib, or you can choose the safety switch to be a magnetic induction switch, such as a reed switch or a Hall element, and the trigger part is a magnet.
  • the housing 3 can be provided with a circuit board 34 that controls the operation of the electromagnetic coil 4, or the circuit board 34 can be placed at other locations, such as on the operating lever 1, or even a specially designed electronic control package that can be separated from the lawn burner. , the circuit board 34 is placed in the electrical control package and electrically connected when needed.
  • the grass burning machine can be powered by commercial power or by batteries.
  • the housing 3 can be provided with a battery that supplies power to the electromagnetic coil 4 .
  • the present invention also has other embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the claims of the present invention. scope of protection.

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  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Insects & Arthropods (AREA)
  • Pest Control & Pesticides (AREA)
  • Wood Science & Technology (AREA)
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Abstract

一种烧草机，包括操作杆（1）、烧草件（2）、壳体（3）和加热器，烧草件（2）连接于操作杆（1），操作杆（1）与壳体（3）活动连接，加热器包括电磁线圈（4），电磁线圈（4）固定于壳体（3），烧草件（2）包括可被电磁加热的导磁体，烧草件（2）具有导磁体位于电磁线圈（4）内进行加热的加热位置和导磁体位于电磁线圈（4）外部进行烧草的工作位置，导磁体的工作温度不低于200℃。该烧草机解决了电阻式加热方式热效率较低、维护成本高的问题，延长了烧草机的使用寿命，降低了使用成本。

Description

一种烧草机 技术领域
本发明涉及消灭无用植物的设备，特别是一种烧草机。
背景技术
本专利申请人在2018年12月27日申请了无风烧草机的实用新型专利，授权公告号为CN209643668U，其中公开了一种无风烧草机，包括操作杆100、供电装置200和加热件300，供电装置200设于操作杆100上且用于向加热件300供电，加热件300设于操作杆100的底端且电连接于供电装置200。无风烧草机还包括设于操作杆100底端的烧草部，烧草部设于加热件300的外部，加热件300通电后的工作温度为200℃～600℃。加热件在工作过程中通电加热，加热的热量在烧草部的辅助作用下释放对杂草进行高温烘灼，杂草在高温烘灼下脱水灼熟，从而实现除草。由于杂草的草叶部分和根茎部分均会在高温烘灼下脱水，有利于提高除草效果。其中，加热件300可以采用加热棒或加热丝，但都是采用电阻式加热方式，电阻式加热方式的热效率较低，电阻丝容易高温氧化出现受损，需要定期维护，维修成本较高。
发明内容
本发明所要达到的目的就是提供一种烧草机，延长使用寿命，降低使用成本。
为了达到上述目的，本发明采用如下技术方案：一种烧草机，包括操作杆、烧草件、壳体和加热器，烧草件连接于操作杆，操作杆与壳体活动连接，加热器包括电磁线圈，电磁线圈固定于壳体，烧草件包括可被电磁加热的导磁体，烧草件具有导磁体位于电磁线圈内进行加热的加热位置和导磁体位于电磁线圈外部进行烧草的工作位置，导磁体的工作温度不低于200℃。
进一步的，所述壳体包括套在烧草件外周的护套，护套的前端设有供烧草件穿过的通孔，电磁线圈固定于护套内。
进一步的，所述护套为隔热护套。
进一步的，所述操作杆与壳体之间设有使烧草件具有维持在加热位置趋势的弹性件。
进一步的，所述弹性件套在操作杆的外周，操作杆设有定位凸台和活动垫片，弹性件的后端抵于定位凸台、前端抵于活动垫片，活动垫片设有限位凸筋，壳体设有与限位凸筋配合将活动垫片定位的限位槽。
进一步的，所述壳体的前端设有可抵于地面将壳体定位的支撑架，操作杆相对壳体活动，使烧草件进入工作位置；或者，所述壳体设有供用户施力的操作部，壳体相对操作杆活动，使烧草件进入工作位置。
进一步的，所述导磁体位于烧草件的前端；或者，所述烧草件由导磁体制成。
进一步的，所述壳体设有常开的安全开关，安全开关用于控制电磁线圈与电源导通或断开，操作杆设有触发部，触发部在烧草件处于加热位置使安全开关闭合。
进一步的，所述安全开关为微动开关，触发部为凸出设置的凸筋；或者，所述安全开关为磁感应开关，触发部为磁铁。
进一步的，所述壳体设有控制电磁线圈工作的线路板；和/或，所述壳体设有为电磁线圈供电的电池。
采用上述技术方案后，本发明具有如下优点：采用电磁加热方式让导磁体快速加热升温，由于是导磁体自身发热，因此热转化率特别高，烧草件能够很快达到目标温度，提高烧草机的使用效率，从根本上解决了电阻丝发热方式热 效率低下的问题；由于电磁线圈本身基本不会产生热量，使用寿命可长达10年，基本不需要检修，无维护更换成本，同时也因为电磁线圈本身不发热，热阻滞小、热惯性低，有利于实时、准确控制导磁体温度，有利于改善烧草机的质量；电磁线圈可以采用耐高温高压的电缆线绕制，相比电阻丝而言，加工非常方便，绝缘性能好，同时无需与导磁体直接接触，基本没有漏电可能，安全无忧；烧草件具有加热位置和工作位置，当烧草件处于加热位置时，导磁体缩回到电磁线圈内，避免导磁体外露，可以对导磁体形成一种程度的防护，避免出现意外磕碰而受损，当烧草件处于工作位置时，导磁体才会移至电磁线圈外部，因此导磁体在加热位置被加热到高温，也不容易被用户接触到，同时可以便于在电磁线圈外部加装隔热护套来进一步提高烧草机使用过程中的安全性。
附图说明
下面结合附图对本发明作进一步说明：
图1为本发明一种烧草机的结构示意图；
图2为本发明一种烧草机的剖视图；
图3为本发明一种烧草机中操作杆、弹性件、烧草件、加热器、护套的爆炸图；
图4为本发明一种烧草机中壳体内部的示意图；
图5为图4中A-A向的剖视图。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚，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。
本发明的说明书和权利要求书及上述附图中的术语“第一”、“第二”、“第 三”“第四”等(如果存在)是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互换，以便这里描述的本发明的实施例能够以除了在这里图示或描述的那些以外的顺序实施。
应当理解，在本发明的各种实施例中，如涉及各过程的序号的大小，并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本发明实施例的实施过程构成任何限定。
应当理解，在本发明中，“包括”和“具有”以及他们的任何变形，意图在于覆盖不排他的包含，例如，包含了一系列步骤或单元的过程、方法、系统、产品或设备不必限于清楚地列出的那些步骤或单元，而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它步骤或单元。
应当理解，在本发明中，“多个”是指两个或两个以上。“和/或”仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，X和/或Y，可以表示：单独存在X、同时存在X和Y、单独存在Y这三种情况。字符“/”一般表示前后关联对象是一种“或”的关系。“包含X、Y和Z”、“包含X、Y、Z”是指X、Y、Z三者都包含，“包含X、Y或Z”是指包含X、Y、Z三者之一，“包含X、Y和/或Z”是指包含X、Y、Z三者中任一个或任二个或三个。
下面以具体地实施例对本发明的技术方案进行详细说明。下面这几个具体的实施例可以根据实际情况选择相互结合或替换，对于相同或相似的概念或过程可能在某些实施例不再赘述。
本发明提供一种烧草机，如图1至图3所示，包括操作杆1、烧草件2、壳体3和加热器，烧草件2连接于操作杆1，操作杆1与壳体3活动连接，加热器包括电磁线圈4，电磁线圈4固定于壳体3，烧草件2包括可被电磁加热的导磁体，烧草件2具有导磁体位于电磁线圈4内进行加热的加热位置和导磁体位于 电磁线圈4外部进行烧草的工作位置，图1所示即处于加热位置，为获得较好的植物杀灭效果，导磁体的工作温度不低于200℃，例如可以控制在200℃、240℃、300℃、350℃、400℃或500℃等等合适的温度，因为采用电磁加热方式，烧草件2的发热温度的可控性提高。
本发明采用电磁加热方式让导磁体快速加热升温，由于是导磁体自身发热，因此热转化率特别高，烧草件2能够很快达到目标温度，提高烧草机的使用效率，从根本上解决了电阻丝发热方式热效率低下的问题；由于电磁线圈4本身基本不会产生热量，使用寿命可长达10年，基本不需要检修，无维护更换成本，同时也因为电磁线圈4本身不发热，热阻滞小、热惯性低，有利于实时、准确控制导磁体温度，有利于改善烧草机的质量；电磁线圈4可以采用耐高温高压的电缆线绕制，相比电阻丝而言，加工非常方便，绝缘性能好，同时无需与导磁体直接接触，基本没有漏电可能，安全无忧；烧草件2具有加热位置和工作位置，当烧草件2处于加热位置时，导磁体缩回到电磁线圈4内，避免导磁体外露，可以对导磁体形成一种程度的防护，避免出现意外磕碰而受损，当烧草件2处于工作位置时，导磁体才会移至电磁线圈4外部，因此导磁体在加热位置被加热到高温，也不容易被用户接触到，同时可以便于在电磁线圈4外部加装隔热护套来进一步提高烧草机使用过程中的安全性。
为了起到防护作用，避免意外磕碰造成烧草件2和电磁线圈4受损，可以设计壳体3包括套在烧草件2外周的护套31，护套31的前端设有供烧草件2穿过的通孔，电磁线圈4固定于护套31内。如前所述，护套31可以采用隔热材料制成的隔热护套，进一步提高烧草机使用过程中的安全性。
为了让烧草件2能够保持在加热位置或工作位置，可以在操作杆1与壳体3之间设置阻尼结构，例如操作杆1上套有橡胶套，橡胶套固定于壳体3，通过橡 胶套与操作杆1之间的摩擦力让烧草件2保持在加热位置或工作位置。
而为了让烧草件2能够自动从工作位置复位到加热位置，可以在操作杆1与壳体3之间设有使烧草件2具有维持在加热位置趋势的弹性件32，避免出现用户忘记将烧草件2从工作位置复位到加热位置的情况。用户将烧草件2插入泥土中杀死植物后，可以利用弹性件32的弹力使烧草件2自动从泥土中退出，用户操作起来会更加省力。这种情况下就不需要阻尼结构，弹性件32的弹力可以让烧草件2保持在加热位置，而用户的作用力可以让烧草件2保持在工作位置。
弹性件32可以采用弹簧或弹垫等常见零件，在一个实施例中，弹性件32套在操作杆1的外周，为了将弹性件32的两端轴向定位，可以在操作杆1设有定位凸台11和活动垫片33，弹性件32的后端抵于定位凸台11、前端抵于活动垫片33，活动垫片33设有限位凸筋331，壳体3设有与限位凸筋331配合将活动垫片33定位的限位槽301(可以如图3至图5所示设在护套31上)。活动垫片33可以从操作杆1上取下，方便安装弹性件32。可以理解的，弹性件32的前端也可以直接抵在壳体3或护套31上，在壳体3或护套31上设置相应的定位结构。
为了让烧草件2在加热位置和工作位置之间方便地切换，在一个实施例中，可以在壳体3的前端设有可抵于地面将壳体3定位的支撑架5，操作杆1相对壳体3活动，使烧草件2进入工作位置，即用户对操作杆1施力，带动烧草件2相对电磁线圈4运动，由于用户本身就需要施力将烧草件2插入泥土，因此可以整合成一次操作，即可完成烧草件2从加热位置切换到工作位置并插入泥土，操作过程更加顺畅。可以理解的，反过来让壳体3相对操作杆1活动也是可行的，例如在壳体3上设有供用户施力的操作部，用户在将烧草件2插入泥土前， 先施力在操作部上让壳体3运动，使烧草件2进入工作位置，然后将烧草件2插入泥土。
由于烧草时起作用的主要是烧草件2的前端，因此在一个实施例中，可以设计导磁体位于烧草件2的前端，烧草件2的其它部位可以采用不能导磁的材料制成，这样在烧草件2进入工作位置，电磁加热就暂停了，可以起到一定的节能作用。可以理解的，如果烧草件2在进入工作位置后仍然需要继续加热，在另一个实施例中，可以将烧草件2整体由导磁体制成或大部分由导磁体制成，烧草件2进入工作位置后，仍然有导磁体位于电磁线圈4内，就可以让烧草件2继续加热。
除了通过设计导磁体在烧草件2进入工作位置后是否位于电磁线圈4内继续加热，在另一个实施例中，可以在壳体3设有常开的安全开关，安全开关用于控制电磁线圈4与电源导通或断开，操作杆1设有触发部，触发部在烧草件2处于加热位置使安全开关闭合。而具体的，可以选择安全开关为微动开关，触发部为凸出设置的凸筋，也可以选择安全开关为磁感应开关，例如干簧管或霍尔元件，触发部为磁铁。
另外，可以在壳体3设有控制电磁线圈4工作的线路板34，也可以将线路板34设置到其它位置，例如操作杆1上，甚至专门设计一个可以与烧草机分离的电控包，将线路板34设在电控包内，在需要使用时进行电连接。烧草机可以采用市电来供电，也可以采用电池来供电，为此可以在壳体3设有为电磁线圈4供电的电池。
除上述优选实施例外，本发明还有其他的实施方式，基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明所请求保护的范围。

Claims (10)

  1. 一种烧草机，包括操作杆、烧草件、壳体和加热器，烧草件连接于操作杆，操作杆与壳体活动连接，其特征在于，所述加热器包括电磁线圈，电磁线圈固定于壳体，烧草件包括可被电磁加热的导磁体，烧草件具有导磁体位于电磁线圈内进行加热的加热位置和导磁体位于电磁线圈外部进行烧草的工作位置。
  2. 根据权利要求1所述的烧草机，其特征在于，所述壳体包括套在烧草件外周的护套，护套的前端设有供烧草件穿过的通孔，电磁线圈固定于护套内。
  3. 根据权利要求2所述的烧草机，其特征在于，所述护套为隔热护套。
  4. 根据权利要求1所述的烧草机，其特征在于，所述操作杆与壳体之间设有使烧草件具有维持在加热位置趋势的弹性件。
  5. 根据权利要求4所述的烧草机，其特征在于，所述弹性件套在操作杆的外周，操作杆设有定位凸台和活动垫片，弹性件的后端抵于定位凸台、前端抵于活动垫片，活动垫片设有限位凸筋，壳体设有与限位凸筋配合将活动垫片定位的限位槽。
  6. 根据权利要求1所述的烧草机，其特征在于，所述壳体的前端设有可抵于地面将壳体定位的支撑架，操作杆相对壳体活动，使烧草件进入工作位置；或者，所述壳体设有供用户施力的操作部，壳体相对操作杆活动，使烧草件进入工作位置。
  7. 根据权利要求1所述的烧草机，其特征在于，所述导磁体位于烧草件的前端；或者，所述烧草件由导磁体制成。
  8. 根据权利要求1所述的烧草机，其特征在于，所述壳体设有常开的安全开关，安全开关用于控制电磁线圈与电源导通或断开，操作杆设有触发部，触发部在烧草件处于加热位置使安全开关闭合。
  9. 根据权利要求8所述的烧草机，其特征在于，所述安全开关为微动开关，触发部为凸出设置的凸筋；或者，所述安全开关为磁感应开关，触发部为磁铁。
  10. 根据权利要求1所述的烧草机，其特征在于，所述壳体设有控制电磁线圈工作的线路板；和/或，所述壳体设有为电磁线圈供电的电池。
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