CN216650507U

CN216650507U - Low-cost two-function handheld lawnmower with replaceable shared battery pack

Info

Publication number: CN216650507U
Application number: CN202123180373.6U
Authority: CN
Inventors: 陆强; 李钢; 方进; 许霞
Original assignee: Suzhou Jinshan Electric Tool Co ltd
Current assignee: Suzhou Jinshan Electric Tool Co ltd
Priority date: 2021-12-17
Filing date: 2021-12-17
Publication date: 2022-06-03
Anticipated expiration: 2031-12-17

Abstract

The utility model provides a low-cost two-function handheld lawnmower with a replaceable shared battery pack, and belongs to the technical field of lawnmowers. The handheld lawnmower comprises a shell and a slot inserted in the shell; the slot is inserted with 5 universal strings of lithium battery pack components, and the 5 universal strings of lithium battery pack components are connected with a battery pack interface PCBA component positioned in the shell; the battery pack interface PCBA component comprises a battery pack socket and a fuse PCB which are connected; the fuse PCB is provided with a PTC thermistor and a chip resistor. The low-cost two-function handheld lawnmower with the replaceable shared battery pack, provided by the utility model, has the advantages that the safety performance and the use experience can completely reach the original lawnmower which uses the body plate and the flow limiting plate and is composed of high-cost semiconductor elements such as MCU, ASIC and MOS, the internal structure of the product is simplified, and the cost is greatly reduced.

Description

Low-cost two-function handheld lawnmower with replaceable shared battery pack

Technical Field

The utility model relates to the technical field of lawnmowers, in particular to a low-cost two-function handheld lawnmower with a replaceable shared battery pack.

Background

Currently, the lithium battery pack is very popular as an energy source of garden electric tools, in order to improve the safety, the universality and the economy of the lithium battery pack and facilitate the charging maintenance, the lithium battery pack is generally designed into a lithium battery, a protection function circuit board and a battery pack with an independent shell, the protection function circuit board inside the battery pack has the functions of lithium battery overcharge protection, overdischarge protection, overcurrent protection, load short-circuit protection, lithium battery temperature abnormal protection and the like, the protection function circuit board protects the lithium battery and also protects the motor and the structural member of the corresponding tool at the same time, so that the battery pack stops discharging when the corresponding tool works abnormally, the damage of the battery or the motor and the structural member caused by the overlarge mechanical load of the tool is avoided, and the common abnormal working phenomena such as the motor stalling caused by the cutting of a grass cutter to a metal wire or a thick branch in a grass cluster and a shrubbery are avoided, when an electric drill and an impact drill are used for punching, a drill bit is clamped in a workpiece to cause injury to a user, and a leaf suction machine sucks in larger stones or thick branches to cause fan blade damage or motor stalling and the like; most tools are designed in such a way that a battery pack and the tools can be separated into a battery pack and a tool main body, the separated battery pack is independently charged and stored, and the safety coefficient is higher due to the separation of the battery pack and the tools; according to the principle of making the best use of things, the garden electric tool comprising the two-function grass mower related to the utility model generally adopts the family design idea, and a plurality of tools share the same battery pack, so that the early purchase cost and the later maintenance cost of a consumer are reduced; however, the working currents under different working conditions are different, and the current protection value and the time delay protection time are different, for example, the difference between the working current of the lawnmower mentioned above and the working current of the electric drill is about 2A, and the difference between the working current of the leaf suction machine and the working current of the electric drill is about 8A, is very large, so that the problem that different tools have different protection currents must be solved firstly to realize sharing of the battery pack; at present, two schemes are generally used in the industry for solving the problem, one scheme is that an MCU is used for designing, different tools are distinguished through software, and then the overcurrent protection value of a protection plate in a battery pack is adjusted, so that the development cost, the material cost and the authentication and maintenance cost of the scheme are very high; the other scheme is that various protection values of a protection circuit in a battery pack are designed into a maximum value of a lithium battery to form a universal battery pack, the protection circuit only protects the lithium battery and does not protect the abnormal condition of the tool, an ASIC and an MOS are used for designing an independent protection circuit in a shell of the tool according to working condition parameters of the tool, commonly called a machine body plate or a current limiting plate, and a motor and a structural member of the tool are protected; in recent years, MCU, ASIC and MOS are seriously insufficient in supply, the price is continuously increased, the cost of the two schemes is difficult to reduce, and the delivery quantity of the lawnmower is limited due to the insufficient supply.

SUMMERY OF THE UTILITY MODEL

In view of the above, in order to solve the above-mentioned deficiencies in the background art, the present invention provides a low-cost two-function handheld lawnmower with a replaceable shared battery pack, wherein the safety performance and the use experience of the low-cost two-function handheld lawnmower can completely reach the original lawnmower using a body plate and a restrictor plate which are composed of high-cost semiconductor elements such as MCU, ASIC, MOS, etc., thereby simplifying the internal structure of the product and greatly reducing the cost.

In order to achieve the purpose, the utility model provides the following technical scheme:

a low-cost two-function handheld lawnmower with a replaceable shared battery pack comprises a shell and a slot inserted in the shell;

a trimming device is arranged on the shell;

the slot is inserted with 5 universal strings of lithium battery pack components, and the 5 universal strings of lithium battery pack components are connected with a battery pack interface PCBA component positioned in the shell;

the battery pack interface PCBA component comprises a battery pack socket and a fuse PCB which are connected;

the PTC thermistor and the chip resistor are arranged on the fuse PCB, the microswitch positioned in the shell is respectively connected with the fuse PCB and the positive electrode of the direct current motor positioned in the shell through a first connecting wire and a second connecting wire, and the fuse PCB is connected with the negative electrode of the direct current motor through a third connecting wire;

the fuse PCB is connected with the LED warning lamp through a connecting wire harness;

the LED warning lamp is composed of an LED warning board PCB and an LED warning board PCB, and a built-in chip self-flashing LED lamp bead is arranged on the LED warning board PCB.

Preferably, the PTC thermistor is packaged on the fuse PCB by an SMT patch.

Preferably, the trimming device is a grass cutting blade assembly or a pruning blade assembly.

Compared with the prior art, the utility model has the following beneficial effects:

the utility model provides a low-cost two-function handheld lawnmower with a replaceable shared battery pack, which uses a two-function handheld lawnmower with a battery pack interface PCBA component consisting of elements such as a low-cost PTC thermistor and the like, and experiments prove that the safety performance and the use experience of the low-cost two-function handheld lawnmower completely reach those of a body plate and a flow limiting plate which are originally made of semiconductor elements such as MCU, ASIC and MOS with high cost, the internal structure of the two-function lawnmower is simplified, the cost is greatly reduced, according to the analysis of the current market situation, the cost of the low-cost two-function handheld lawnmower can be reduced by 4-5 yuan compared with that of a body plate and a flow limiting plate which are originally made of MCU or ASIC and MOS, and the problem of quantity limitation caused by insufficient supply of the elements such as MCU, ASIC and MOS is avoided, so that consumers can use higher product cost performance.

Drawings

FIG. 1 is a constructional view of the present invention;

FIG. 2 is a schematic diagram of a structure of a battery pack interface PCBA assembly;

FIG. 3 is an electrical schematic diagram of a battery pack interface PCBA assembly;

in the drawing, 101, a left shell, 102, a right shell, 103, a left slot, 104, a right slot, 105, a battery pack interface PCBA component, 106, a first connecting wire, 107, a micro switch, 108, a second connecting wire, 109, a third connecting wire, 110, a connecting wire harness, 111, an LED warning lamp, 112, a direct current motor, 113, a gear box, 114, a motor gear, 115, a linkage gear, 116, an eccentric output gear wheel, 117, a grass cutting blade component, 118, a branch cutting blade component, 119, a switch button, 120, a first reset spring, 121, a safety button, 122, a second reset spring, 123, a universal 5-string lithium battery pack component, 201, a battery pack socket, 202, a fuse PCB, 203, a PTC thermistor, 204, a chip resistor, 205, an LED warning board PCB, 206, and a built-in-chip self-flashing LED lamp bead.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below 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 embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1-3, the present invention provides a low-cost two-function handheld lawnmower with a replaceable shared battery pack, comprising a housing and a slot inserted into the housing;

a trimming device is arranged on the shell;

the slot is inserted with 5 universal strings of lithium battery pack components 123, and the 5 universal strings of lithium battery pack components 123 are connected with a battery pack interface PCBA 105 component positioned in the shell;

the battery pack interface PCBA assembly 105 comprises a battery pack socket 201 and a fuse PCB202 which are connected;

the fuse PCB202 is provided with a PTC thermistor 203 and a chip resistor 204, a microswitch 107 positioned in the shell is respectively connected with the fuse PCB202 and the positive electrode of a direct current motor 112 positioned in the shell through a first connecting wire 106 and a second connecting wire 108, and the fuse PCB202 is connected with the negative electrode of the direct current motor 112 through a third connecting wire 109;

the fuse PCB202 is connected to the LED warning light 111 via the connection harness 110.

In the utility model, the LED warning light 206 is a self-flashing LED lamp bead with a built-in chip.

In the present invention, the PTC thermistor 203 is packaged on the fuse PCB202 by SMT.

In the present invention, the cutting device is either a grass cutting blade assembly 117 or a pruning blade assembly 118, which are detachable and interchangeable, and only one type of cutting device can be installed during operation.

The specific structure of the lawnmower provided by the utility model is as follows:

the grass mower comprises a shell body consisting of a left shell body 101 and a right shell body 102, wherein a left slot 103 and a right slot 104 are arranged on the shell body, a grass cutting blade group 117 and a pruning blade group 118 which can be detached and interchanged are arranged on the shell body, a motor 112 for driving the blade group is arranged in the shell body, the motor 112 is connected with the grass cutting blade group 117 or the pruning blade group 118 through a gear set consisting of a motor gear 114, a linkage gear 115 and an eccentric output large gear 116, a switch 107 for switching on and off the motor, a switch button 119 for triggering the switch 107, a first return spring 120, a switch mechanism consisting of a safety button 121 and a second return spring 122 are arranged on the shell body, the grass mower also comprises a battery pack interface PCBA assembly 105, the battery pack interface PCBA assembly 105 comprises a positive temperature coefficient PTC thermistor 203 and an LED warning lamp 111 consisting of a resistor and an LED, the battery pack interface PCBA assembly 105 is connected with a microswitch 107 through a first connecting lead 106, and is connected to the positive pole of the direct current motor 112 through a second connecting lead 108, and is connected to the negative pole of the direct current motor 112 through a third connecting lead 109 to form a loop.

When the lawnmower provided by the utility model is used, under a normal working condition, the positive temperature coefficient PTC thermistor 203 on the battery pack interface PCBA assembly 105 is conducted, the LED warning lamp 111 cannot flash, the direct current motor 112 operates and drives the grass cutting blade assembly 117 or the pruning blade assembly 118 to work through the gear set, if the metal or an object exceeding the cutting capability of the blade set is cut in the work of the trimming device, such as a tree branch with thick diameter and hard wood, the current of the direct current motor 112 is increased, the temperature of the positive temperature coefficient PTC thermistor 203 is increased, once the Curie temperature is exceeded, the resistance value of the PTC thermistor 203 is increased in a step mode, the direct current motor 112 stops working, and meanwhile, the LED warning lamp 111 flashes to prompt that the state of the lawnmower is abnormal, and the lawnmower enters a protection state; at this time, the switch should be released, the motor loop power supply is cut off, and the PTC thermistor 203 will be restored to the conducting state; if the working condition is relieved, the switch is pressed down, the LED warning lamp 111 cannot flash, and the lawnmower can continue to work normally; if the switch is pressed before the PTC thermistor 203 is recovered to be on, the LED warning lamp 111 flashes to prompt that the protection is not released, the direct current motor 112 cannot work, the LED warning lamp 111 flashes to prompt a user that the switch should be released, and the PTC thermistor 203 enters the state to be recovered again.

In the grass mower of the utility model, the protection current, the response time of protection action and the recovery time after protection of the two-function grass mower can be adjusted by selecting different PTC thermistors 203;

the pruning blade group 117 and the pruning blade group 118 can be interchanged, and the two-function lawnmower can only be provided with one group of blades for working;

the slot part that is used for being connected with the battery package on the casing is detachable with the casing, can match the battery package of multiple different draw-in grooves through changing different slots.

The LED warning board PCB205 is an additional device, and for highlighting the display effect, the self-flashing LED lamp bead 206 with a built-in chip is used, and meanwhile, the LED warning board PCB205 can be omitted for reducing the cost.

The above are merely preferred embodiments of the present invention; the scope of the utility model is not limited thereto. Any person skilled in the art should be able to cover the technical scope of the present invention by equivalent or modified solutions and modifications within the technical scope of the present invention.

Claims

1. A low-cost two-function handheld lawnmower with a replaceable shared battery pack is characterized by comprising a shell and a slot inserted in the shell;

a trimming device is arranged on the shell;

a universal 5-string lithium battery pack component (123) is inserted into the slot, and the universal 5-string lithium battery pack component (123) is connected with a battery pack interface PCBA component (105) positioned in the shell;

the battery pack interface PCBA component (105) comprises a battery pack socket (201) and a fuse PCB (202) which are connected;

a PTC thermistor (203) and a chip resistor (204) are arranged on the fuse PCB (202), a microswitch (107) positioned in the shell is respectively connected with the fuse PCB (202) and the positive electrode of a direct current motor (112) positioned in the shell through a first connecting wire (106) and a second connecting wire (108), and the fuse PCB (202) is connected with the negative electrode of the direct current motor (112) through a third connecting wire (109);

the fuse PCB (202) is connected with the LED warning lamp (111) through a connecting wire harness (110);

LED warning light (111) are provided with built-in chip on warning board PCB (205) and the warning board PCB (205) of LED and are from dodging LED lamp pearl (206) and constitute.

2. A low cost two function handheld lawnmower with replaceable shared battery pack according to claim 1, wherein the PTC thermistor (203) is packaged on the fuse PCB (202) by SMT patches.

3. A low cost two function handheld lawnmower with replaceable shared battery pack according to claim 1 or claim 2, wherein the trimming device is a grass cutting blade assembly (117) or a pruning blade assembly (118).