Electric tool

Abstract

The utility model provides an electric tool which comprises a main body, a connecting assembly connected with the main body and a main control module arranged on the connecting assembly. The connecting assembly comprises a first connecting assembly and a second connecting assembly, a telescopic control assembly is arranged at the joint of the first connecting assembly and the second connecting assembly, and the telescopic control assembly comprises a cross beam; the electric tool further comprises a telescopic switch assembly. The telescopic switch assembly comprises a first position signal component arranged on the cross beam and a second position signal component arranged on the second connecting assembly. When the second connecting assembly is in the first state, the first position signal component corresponds to the second position signal component, and at the moment, the telescopic switch assembly generates a first signal and transmits the first signal to the main control module. According to the electric tool, the telescopic switch assembly is adopted to detect the telescopic state of the connecting assembly, it is guaranteed that the second connecting assembly is in the extending state when the electric tool works, then operation safety is guaranteed, and meanwhile the structure is simple and reliability is high.

Description

Technical Field

[0001] This utility model relates to the field of power tool structure technology, and in particular to a power tool. Background Technology

[0002] Currently, lawnmowers are generally equipped with a connecting component for pushing. The connecting component usually includes a first connecting component connected to both sides of the lawnmower body and a second connecting component that can be retractably connected to the first connecting component. The second connecting component is equipped with a handle for the operator to push the lawnmower during operation.

[0003] When the lawnmower is in operation, the connecting assembly extends a certain length backwards from the main body of the lawnmower, allowing the operator to work at a safe distance from the cutting tools. When the lawnmower is not in operation, it needs to be stored. For storage, the connecting assembly adopts a folding and telescopic design. Specifically, during storage, the second connecting assembly can retract into the first connecting assembly to shorten its length and fold until it is close to the main body of the lawnmower, minimizing its space occupation. Simultaneously, for safety, a safety switch mechanism is installed on the connecting assembly. When the second connecting assembly is fully extended, the safety switch mechanism is triggered, outputting a switch signal to the main control module. Only then will the main control module enter normal operating mode and respond to operations such as blade movement and lawnmower movement.

[0004] Current safety switch mechanisms typically employ microswitches and trigger rods. When the second connecting component is extended, the trigger rod activates the microswitch. However, this type of safety switch mechanism involves numerous switching devices and wiring harnesses, increasing cost and assembly complexity, and also resulting in poor reliability. Utility Model Content

[0005] The purpose of this utility model is to provide an electric tool that uses a telescopic switch assembly to detect the extension and retraction state of the connecting assembly, ensuring that the second connecting assembly is in the extended state when the electric tool is working, thereby ensuring operational safety. At the same time, the structure is simple and has high reliability.

[0006] This utility model provides an electric tool, including a main body, a connecting component connected to the main body, and a main control module disposed on the connecting component; the connecting component includes a first connecting component and a second connecting component, one end of the first connecting component is connected to the main body, and the other end of the first connecting component is retractably connected to one end of the second connecting component; the main control module is mounted on the end of the second connecting component away from the first connecting component; a telescopic control component is provided at the connection between the first connecting component and the second connecting component, the telescopic control component includes a crossbeam, the crossbeam being connected to the first connecting component; the electric tool also includes a telescopic switch assembly, the telescopic switch assembly being electrically connected to the main control module, the telescopic switch assembly including a first position signal component disposed on the crossbeam and a second position signal component disposed on the second connecting component;

[0007] When the second connection component is in the first state, the first position signal component corresponds to the second position signal component. At this time, the telescopic switch component generates a first signal and transmits it to the main control module.

[0008] In one possible implementation, the main body is provided with a first connecting component and a second connecting component on opposite sides, and the opposite ends of the crossbeam are respectively connected to the first connecting components on opposite sides; the first position signal component includes a conductive element disposed in the crossbeam, and the second position signal component includes a docking component disposed on the second connecting components on opposite sides, and the docking components on the second connecting components on opposite sides are respectively electrically connected to the main control module;

[0009] When the second connecting component is in the first state, the two ends of the conductive element are electrically connected to the mating parts on the two sides of the second connecting component to form a current loop.

[0010] In one possible implementation, the second connecting component is made of a conductive material, and the docking member is electrically connected to the main control module through the second connecting component;

[0011] Alternatively, the docking component is electrically connected to the main control module via a wire located inside the second connection assembly.

[0012] In one possible implementation, the telescopic switch assembly is a photoelectric switch assembly, wherein the first position signal component and / or the second position signal component includes a light emitting module and a light receiving module, and the main control module is electrically connected to the light emitting module and the light receiving module;

[0013] When the second connection component is in the first state, the optical receiving module can generate photoelectric change signals and transmit them to the main control module.

[0014] In one possible implementation, the telescopic switch assembly is a through-beam photoelectric switch assembly, a slotted photoelectric switch assembly, a specular reflection photoelectric switch assembly, or a diffuse reflection photoelectric switch assembly.

[0015] In one possible implementation, the retractable switch assembly is a laser transceiver assembly; one of the first position signal component and the second position signal component includes a laser emitting module, and the other includes a laser receiving module, and the main control module is electrically connected to the laser emitting module and the laser receiving module;

[0016] When the second connection component is in the first state, the laser emitting module corresponds to the laser receiving module, enabling the laser receiving module to receive the laser emitted by the laser emitting module, thereby causing the laser receiving module to generate a photoelectric change signal and transmit it to the main control module.

[0017] In one possible implementation, the second position signal component is disposed within the second connecting assembly, the second connecting assembly having a through hole penetrating its sidewall, the through hole corresponding to the second position signal component, the through hole being located between the second position signal component and the first position signal component.

[0018] In one possible implementation, the retractable switch assembly is a Hall sensor assembly; one of the first position signal component and the second position signal component includes a Hall switch, and the other includes a magnetic element, and the main control module is electrically connected to the Hall switch;

[0019] When the second connection component is in the first state, the Hall switch corresponds to the magnetic element, causing the Hall switch to generate a Hall signal and transmit it to the main control module.

[0020] In one possible implementation, the retractable switch assembly is an NFC sensing assembly; one of the first position signal component and the second position signal component includes a radio frequency transceiver module, and the other includes an NFC sensing element, and the main control module is electrically connected to the radio frequency transceiver module;

[0021] When the second connection component is in the first state, the radio frequency transceiver module corresponds to the NFC sensing element, causing the radio frequency transceiver module to generate an electrical signal and transmit it to the main control module.

[0022] In one feasible manner, the power tool is a lawnmower or a snowplow.

[0023] The power tool provided by this utility model features a telescopic switch assembly. This assembly includes a first position signal component mounted on a crossbeam and a second position signal component mounted on a second connecting component. When the second connecting component is in a first state, the second position signal component corresponds to the crossbeam, meaning it corresponds to the first position signal component. This causes the telescopic switch assembly to generate a first signal, which is transmitted to the main control module. The main control module then enters normal operation, responding to operations such as the operation of the travel drive motor and the work drive motor. This ensures that the second connecting component is in the extended state when the power tool is in operation, thereby guaranteeing operational safety. Furthermore, this telescopic switch assembly has a simple structure, reducing switch costs and assembly complexity, and offers high reliability. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of the power tool in the first embodiment of this utility model.

[0025] Figure 2 for Figure 1 A bottom view.

[0026] Figure 3 This is a schematic diagram of the signal transmission between the main control module and the motor control module in the first embodiment of this utility model.

[0027] Figure 4 This is a schematic diagram showing the installation position of the telescopic switch assembly in the first embodiment of this utility model.

[0028] Figure 5 This is a schematic diagram showing the installation position of the telescopic switch assembly in another embodiment of the present invention.

[0029] Figure 6 This is a schematic diagram showing the installation position of the telescopic switch assembly in the second embodiment of this utility model.

[0030] Figure 7 This is a schematic diagram showing the installation position of the telescopic switch assembly in another embodiment of the present invention.

[0031] Figure 8 This is a schematic diagram showing the installation position of the telescopic switch assembly in another embodiment of the present invention.

[0032] Figure 9 This is a schematic diagram showing the installation position of the telescopic switch assembly in another embodiment of the present invention.

[0033] Figure 10 This is a schematic diagram showing the installation position of the telescopic switch assembly in the third embodiment of this utility model.

[0034] Figure 11This is a schematic diagram showing the installation position of the telescopic switch assembly in the fourth embodiment of this utility model.

[0035] Figure 12 This is a schematic diagram showing the installation position of the telescopic switch assembly in the fifth embodiment of this utility model. Detailed Implementation

[0036] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0037] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and claims of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0038] First Embodiment

[0039] like Figures 1 to 4 As shown, the first embodiment of this utility model provides an electric tool, including a main body 1 (i.e., chassis), a connecting component 2 connected to the main body 1, and a main control module 4 (i.e., control panel) disposed on the connecting component 2; the main body 1 is provided with rollers 11 for supporting the main body 1, a travel drive motor 12 for driving the rollers 11 to rotate, a workpiece 13 for performing work, and a work drive motor 14 for driving the workpiece 13 to operate; the main control module 4 can be signal connected to the travel drive motor 12 and the work drive motor 14 respectively to control the operation of the travel drive motor 12 and the work drive motor 14. The main body 1 serves as the primary support structure for the power tool, assembling all parts into a single unit. The roller 11 can rotate relative to the main body 1, allowing the main body 1 to move on the ground. The walking drive motor 12 is connected to the roller 11 via a transmission mechanism (not shown), thereby driving the roller 11 to rotate through the transmission mechanism. The work drive motor 14 is used to drive the workpiece 13 to perform tasks (such as mowing lawns, snowplowing, etc.). The connecting component 2 is used for the user to push the power tool. The main control module 4 is used for user operation to perform tasks and walking.

[0040] The connecting component 2 is rotatably connected to the main body 1 and is retractable, thus enabling it to fold and extend for storage. The connecting component 2 includes a first connecting component 21 and a second connecting component 22 arranged in parallel. One end of the first connecting component 21 is connected to the main body 1 (specifically, rotatably connected), and the other end of the first connecting component 21 is retractably connected to one end of the second connecting component 22. Specifically, both the first connecting component 21 and the second connecting component 22 are hollow tubular structures, with the second connecting component 22 fitted inside the first connecting component 21, allowing it to be retractably stored within the first connecting component 21. The connecting component 2 is connected to a handle 24, which is connected to the end of the second connecting component 22 furthest from the first connecting component 21. The handle 24 is connected to the main body 1 via the connecting component 2, allowing the user to hold and push the power tool. The main control module 4 is installed at the end of the second connecting component 22 furthest from the first connecting component 21.

[0041] The second connection component 22 has a first state (i.e., as shown in the first state). Figure 1 The system has two states: the extended state and the retracted state (not shown in the figure). The system can switch between these two states. When the second connecting component 22 is in the first state, most of its portion extends beyond the first connecting component 21. For example, the length of the overlap between the second connecting component 22 and the first connecting component 21 is less than or equal to 5% of the total length of the second connecting component 22, thus elongating the connecting component 2. When the second connecting component 22 is in the second state, most of its portion retracts into the first connecting component 21. For example, the length of the overlap between the second connecting component 22 and the first connecting component 21 is greater than or equal to 80% of the total length of the second connecting component 22, thus shortening the connecting component 2. Simultaneously, when the connecting component 2 rotates relative to the main body 1, it has a folded state (not shown in the figure) and an unfolded state (i.e., as shown in the figure). Figure 1 (As shown in the diagram) and can switch between two states. When the power tool is in working state, the connecting component 2 rotates backward relative to the main body 1 and is in an unfolded state, and the second connecting component 22 is in the first state, with the connecting component 2 located behind the main body 1. At this time, the user can push the power tool through the connecting component 2, and the user can control the operation of the power tool by operating the main control module 4. When the power tool is not in working state, the connecting component 2 rotates forward relative to the main body 1 and is in a folded state, and the second connecting component 22 is in the second state. At this time, the connecting component 2 is close to the main body 1, thereby saving space occupied by the device and making it easy to store.

[0042] A telescopic control component 23 is provided at the connection between the first connecting component 21 and the second connecting component 22. The telescopic control component 23 includes a crossbeam 231 and a locking member (not shown) disposed within the crossbeam 231. The crossbeam 231 is fixedly connected to the first connecting component 21. The locking member is used to lock the second connecting component 22 in a first state or a second state (specifically, the first connecting component 21 and the second connecting component 22 are provided with limiting holes, and the locking member is telescopic; when the second connecting component 22 is extended to the position or retracted to the position, the locking member can be locked in the limiting holes to restrict the telescopic movement of the second connecting component 22 relative to the first connecting component 21. For the specific structure and working principle of the telescopic control component 23, please refer to the patent applications previously filed by the applicant, such as CN113875399B and CN114365616B, etc., which will not be elaborated here). Specifically, the main body 1 is provided with a first connecting component 21 and a second connecting component 22 on both opposite sides. The crossbeam 231 is a shell structure with open ends. The opposite ends of the crossbeam 231 are respectively connected to the first connecting component 21 on both opposite sides. The opposite ends of the main control module 4 are respectively connected to the second connecting component 22 on both opposite sides.

[0043] The power tool also includes a telescopic switch assembly 6, which is electrically connected to the main control module 4. Specifically, the main control module 4 can be electrically connected to the telescopic switch assembly 6 via a wire 7, which runs through the second connecting assembly 22. The telescopic switch assembly 6 includes a first position signal component 61 mounted on the crossbeam 231 and a second position signal component 62 mounted on the second connecting assembly 22. The main control module 4 is electrically connected to the first position signal component 61 and / or the second position signal component 62. When the second connecting component 22 is in the first state (i.e., when the second connecting component 22 is extended to the position), the first position signal component 61 corresponds to the second position signal component 62. At this time, the telescopic switch component 6 generates a first signal (i.e., the signal that the second connecting component 22 is extended to the position) and transmits the first signal to the main control module 4. After receiving the first signal, the main control module 4 enters the normal operation state. At this time, the main control module 4 can respond to the operation commands issued by the user, such as the operation of the walking drive motor 12 and the working drive motor 14. That is, the main control module 4 allows the walking drive motor 12 and the working drive motor 14 to operate. However, when the main control module 4 does not receive the first signal, the main control module 4 does not respond to (blocks) the operation commands issued by the user, such as the operation of the walking drive motor 12 and the working drive motor 14. That is, the main control module 4 does not allow the walking drive motor 12 and the working drive motor 14 to operate.

[0044] The power tool provided in this embodiment features a telescopic switch assembly 6. The telescopic switch assembly 6 includes a first position signal component 61 mounted on a crossbeam 231 and a second position signal component 62 mounted on a second connecting component 22. When the second connecting component 22 is in a first state, the second position signal component 62 corresponds to the crossbeam 231, that is, the second position signal component 62 corresponds to the first position signal component 61. This causes the telescopic switch assembly 6 to generate a first signal and transmit it to the main control module 4. At this time, the main control module 4 enters a normal operating state and responds to operations such as the operation of the travel drive motor 12 and the work drive motor 14, thereby ensuring that the second connecting component 22 is in the extended state when the power tool is working, thus ensuring operational safety. At the same time, the telescopic switch assembly 6 has a simple structure, reduces the cost of switching and assembly complexity, and has high reliability.

[0045] like Figure 4 As shown, in one embodiment, the first position signal component 61 includes a conductive element 611 disposed within the crossbeam 231, extending from one end of the conductive element 611 to the opposite end; the second position signal component 62 includes docking parts 621 disposed on the second connecting assemblies 22 on opposite sides, and the docking parts 621 on the second connecting assemblies 22 on opposite sides are respectively electrically connected to the main control module 4. When the second connecting assembly 22 is in the first state, the opposite ends of the conductive element 611 are respectively electrically connected to the docking parts 621 on the second connecting assemblies 22 on opposite sides to form a current loop (i.e., forming a current loop of main control module 4-docking part 621-conductive element 611-docking part 621-main control module 4). Specifically, when the second connecting component 22 is in the process of extension and retraction but has not yet extended to its full position, the conductive element 611 and the docking element 621 are not connected to form a current loop. At this time, the main control module 4 cannot detect the current signal, so it is determined that the second connecting component 22 has not yet extended to its full position. When the second connecting component 22 extends to its full position, the two ends of the conductive element 611 are electrically connected to the docking elements 621 on the two sides of the second connecting component 22 respectively and form a current loop. At this time, the main control module 4 detects the current signal, so it is determined that the second connecting component 22 has extended to its full position.

[0046] Specifically, the main control module 4 includes a first control unit 41 and a current detection circuit 461. The first control unit 41 is electrically connected to the current detection circuit 461, and the first control unit 41 can be signal-connected to the walking drive motor 12 and the working drive motor 14 respectively. The docking parts 621 on the second connecting components 22 on opposite sides are electrically connected to the current detection circuit 461 respectively. When the second connecting components 22 are in the first state, a current loop is formed between the current detection circuit 461, the docking parts 621 and the conductive parts 611. At this time, the current detection circuit 461 sends an electrical signal (i.e., the first signal) to the first control unit 41, and the first control unit 41 then allows the walking drive motor 12 and the working drive motor 14 to operate.

[0047] like Figure 4 As shown, in one embodiment, the first position signal component 61 is disposed within the crossbeam 231, and the second position signal component 62 is disposed within the second connecting assembly 22. The second connecting assembly 22 has a through hole 220 penetrating its sidewall, corresponding to the second position signal component 62, and located between the second position signal component 62 and the first position signal component 61. Through this through hole 220, the conductive component 611 can be electrically connected to the mating component 621. Simultaneously, when the second connecting assembly 22 is in the first state, if the first connecting assembly 21 obstructs the through hole 220, then the first connecting assembly 21 also needs to be provided with a through hole (not shown) corresponding to the through hole 220.

[0048] like Figure 4 As shown, in one embodiment, the conductive element 611 can be a wire, a conductive rod, etc. Both ends of the conductive element 611 are provided with mating parts 612, and the mating parts 612 are electrically connected to the conductive element 611. When the second connecting assembly 22 is in the first state, the mating parts 612 at both ends of the conductive element 611 are electrically connected to the mating parts 621 on the second connecting assembly 22 on both sides to form a current loop.

[0049] In one implementation, the mating part 612 is a retractable electrical connector, specifically a spring pin, spring ball, or other structure (spring pins and spring balls are existing technologies, and their specific structures will not be described here). The docking part 621 can be a conductive block (such as a copper block, aluminum block, etc.), a terminal block, or other structure. When the second connecting assembly 22 is in the first state, the mating part 612 can extend into the second connecting assembly 22 through the through hole 220 and contact the docking part 621 to achieve electrical connection. However, when the second connecting assembly 22 is in the extension or retraction process and has not yet extended to its full position, the mating part 612 abuts against the outer wall of the second connecting assembly 22 and cannot extend into the second connecting assembly 22.

[0050] In another implementation, the docking member 621 is a telescopic electrical connector, specifically a spring pin, spring ball, or similar structure, and the mating member 612 can be a conductive block, terminal block, or similar structure. When the second connecting component 22 is in the first state, the docking member 621 can extend out of the second connecting component 22 through the through hole 220 and contact the mating member 612 to achieve electrical connection. However, when the second connecting component 22 is in the process of telescoping and has not yet extended to its full position, the docking member 621 abuts against the inner wall of the first connecting component 21 and cannot extend out of the second connecting component 22 to contact the mating member 612.

[0051] like Figure 4 As shown, in one embodiment, the docking part 621 is electrically connected to the main control module 4 via the wire 7 (that is, the docking parts 621 on the two opposite sides of the second connecting assembly 22 are electrically connected to the main control module 4 via the wire 7 respectively). The wire 7 is located inside the second connecting assembly 22, that is, the wire 7 runs through the second connecting assembly 22. One end of the wire 7 is electrically connected to the docking part 621, and the other end is electrically connected to the main control module 4.

[0052] like Figure 5 As shown, in another embodiment, the second connecting component 22 is made of a conductive material (specifically, it can be a conductive material such as steel or iron). The docking member 621 is electrically connected to the main control module 4 through the second connecting component 22, thus eliminating the need for wires inside the second connecting component 22. Specifically, the docking member 621 is in contact with one end of the second connecting component 22, and the other end of the second connecting component 22 can be electrically connected to the main control module 4 through a wire.

[0053] like Figures 1 to 3 As shown, in one embodiment, the power tool also includes a motor control module 3 and a first power supply 15 disposed on the main body 1. The first power supply 15 is electrically connected to the motor control module 3, the travel drive motor 12, and the work drive motor 14, respectively. The first power supply 15 is used to supply power to the motor control module 3, the travel drive motor 12, and the work drive motor 14 (of course, the first power supply 15 can also supply power to other components on the main body 1, such as the lighting module on the main body 1). Generally, the first power supply 15 is detachably connected to the main body 1 to facilitate charging of the first power supply 15; the motor control module 3 is disposed below the power supply module 15.

[0054] The main control module 4 includes a first control unit 41, and the motor control module 3 includes a second control unit 31. In this embodiment, both the first control unit 41 and the second control unit 31 are MCUs (Microcontroller Units). The second control unit 31 is electrically connected to the walking drive motor 12 and the working drive motor 14, respectively. The first control unit 41 and the second control unit 31 can communicate with each other, that is, the main control module 4 and the motor control module 3 can communicate with each other, thereby controlling the operation of the walking drive motor 12 and the working drive motor 14 through the motor control module 3 based on user operation (i.e., this power tool has dual control modules).

[0055] The power tool also includes a second power supply 45, which is disposed on the connection component 2 and is electrically connected to the main control module 4. The second power supply 45 is used to supply power to the main control module 4.

[0056] In this system, the first power supply 15 is typically a large battery (specifically, a large battery pack), while the second power supply 45 is typically a small battery. That is, the volume, capacity, and supply voltage of the first power supply 15 are generally larger than those of the second power supply 45. The second power supply 45 can specifically use button batteries, pouch batteries, cylindrical batteries, etc. The second power supply 45 generally uses rechargeable batteries.

[0057] In existing technologies, the motor control module 3 and the main control module 4 are typically connected via a long wiring harness. This harness enables the motor control module 3 to supply power to the main control module 4 and facilitates communication between the two (i.e., the harness includes power and communication lines). Signal transmission and electrical connection are achieved through a wired connection, and both the motor control module 3 and the main control module 4 are powered by the first power supply 15. In this embodiment, the power tool utilizes a second power supply 45, which can independently power the main control module 4. This eliminates the need to rely on the first power supply 15 for power supply, thus eliminating the need for a power cable between the motor control module 3 and the main control module 4. This reduces the use of wiring harnesses, saves on wiring harness costs, lowers assembly difficulty, reduces the inherent risks of wiring harnesses, and improves safety, reliability, and the aesthetics of the equipment.

[0058] like Figure 1 and Figure 3As shown, in one embodiment, the power tool further includes a wireless communication module 5. The wireless communication module 5 includes a first wireless communication unit 51 and a second wireless communication unit 52. The first wireless communication unit 51 is electrically connected to the first control unit 41, and the second wireless communication unit 52 is electrically connected to the second control unit 31. The first wireless communication unit 51 and the second wireless communication unit 52 can communicate wirelessly, so that the first control unit 41 and the second control unit 31 can communicate wirelessly through the wireless communication module 5, thereby enabling the main control module 4 and the motor control module 3 to communicate wirelessly through the wireless communication module 5.

[0059] By setting up the wireless communication module 5, the main control module 4 and the motor control module 3 communicate wirelessly through the wireless communication module 5. Therefore, there is no need to set up a communication line between the motor control module 3 and the main control module 4, thereby further reducing the use of wiring harnesses (that is, changing wired communication to wireless communication).

[0060] In one implementation, the wireless communication module 5 is a Bluetooth communication module. The first wireless communication unit 51 includes a first Bluetooth module, and the second wireless communication unit 52 includes a second Bluetooth module. The first and second Bluetooth modules are capable of wireless communication (specifically, Bluetooth wireless communication). Bluetooth technology, as a low-power, low-cost, short-range wireless communication technology, allows two devices to connect directly and exchange data without network infrastructure. The maximum transmission distance of Bluetooth signals is 10 cm to 10 meters, which can be increased to 100 meters by increasing the transmission power. The distance between the main control module 4 and the motor control module 3 is about 2 meters, achieving good transmission performance within the optimal Bluetooth signal transmission range. Furthermore, the Bluetooth module has no specific limitations on installation angle and position; therefore, this solution does not require specific structural design for signal transmission and reception, saving on R&D and assembly costs. For details on the specific device structure and working principle of Bluetooth communication technology, please refer to existing technologies, which will not be elaborated here.

[0061] In another implementation, the wireless communication module 5 is an infrared communication module. The first wireless communication unit 51 includes a first infrared transceiver unit, and the second wireless communication unit 52 includes a second infrared transceiver unit. The first and second infrared transceiver units are capable of wireless communication (specifically, infrared wireless communication). The first infrared transceiver unit includes a first infrared transmitting unit and a first infrared receiving unit, and the second infrared transceiver unit includes a second infrared transmitting unit and a second infrared receiving unit. The first infrared receiving unit can receive infrared signals emitted by the second infrared transmitting unit, and the second infrared receiving unit can receive infrared signals emitted by the first infrared transmitting unit. The infrared transmitting unit mainly includes devices such as an infrared emitting tube for emitting infrared rays, and the infrared receiving unit mainly includes devices such as an infrared receiving tube for receiving infrared rays. Since the signal transmission medium for infrared communication is near-infrared light, the structure needs to consider the transmission of infrared light. When specifically setting the positions of the first wireless communication unit 51 and the second wireless communication unit 52, the first wireless communication unit 51 can be placed on the main control module 4, and the second wireless communication unit 52 can be placed on the telescopic control component 23. This ensures that the first wireless communication unit 51 is always aligned with the second wireless communication unit 52 (details will be provided later), thereby guaranteeing the smooth transmission of infrared signals. For the specific device structure and working principle of infrared communication technology, please refer to existing technologies; they will not be elaborated here.

[0062] In another implementation, the wireless communication module 5 is a radio frequency (RF) communication module. The first wireless communication unit 51 includes a first RF transceiver unit, and the second wireless communication unit 52 includes a second RF transceiver unit. The first and second RF transceiver units are capable of wireless communication (specifically, RF wireless communication). RF, short for radio frequency, refers to radio frequency current, a type of high-frequency alternating electromagnetic wave. RF technology is a technology for signal transmission and processing within the radio wave frequency range. Similar to Bluetooth communication, RF technology is a low-power, low-cost, short-range wireless communication technology widely used in consumer electronics. Its working principle involves modulating the information source (analog or digital signal) with a high-frequency current (amplitude modulation or frequency modulation) to form an RF signal, which is then transmitted into the air via an antenna. The RF signal is received at a long distance and demodulated to restore the electrical information source. An RF transceiver unit generally includes a transmitter circuit, a receiver circuit, and an antenna. Because the RF signal is radiated into space through the antenna, there are no specific restrictions on the installation angle of the RF transceiver unit, further reducing assembly difficulty. For specific device structures and working principles of RF communication technology, please refer to existing technologies, which will not be elaborated here.

[0063] like Figure 3As shown, in one implementation, when the wireless communication module 5 is a Bluetooth communication module, an infrared communication module, or a radio frequency communication module, the main control module 4 further includes a Bluetooth module 42, which is electrically connected to the first control unit 41. The Bluetooth module 42 is used for wireless communication with the external device 8 (specifically, Bluetooth wireless communication). The external device 8 can be a user's mobile terminal device (e.g., a mobile phone, computer, etc.), a remote control, etc. By setting the Bluetooth module 42 to communicate wirelessly with the external device 8, the user can control the operation of the power tool through the external device 8 (e.g., through a mobile app).

[0064] In another implementation, the wireless communication module 5 is a star-flash communication module. The first wireless communication unit 51 includes a first star-flash module, and the second wireless communication unit 52 includes a second star-flash module. The first and second star-flash modules are capable of wireless communication (specifically, star-flash wireless communication). Simultaneously, the first star-flash module is also used for wireless communication with an external device 8, allowing the user to control the operation of the power tool through the external device 8. In this case, there is no need to additionally set up a Bluetooth module 42 for communication with the external device 8. By setting up the star-flash communication module, two communication domains are formed between the motor control module 3, the main control module 4, and the external device 8. The motor control module 3 and the main control module 4 form the first communication domain, and the main control module 4 and the external device 8 form the second communication domain. That is, the first star-flash module can handle both communication within the device and communication outside the device. Before the advent of StarSpeed ​​technology, the main solutions for short-range wireless communication were Bluetooth and Wi-Fi. However, these two standards were separate: Bluetooth focused on low power consumption, while Wi-Fi prioritized high efficiency. Each had its strengths but was incompatible. StarSpeed ​​technology, as a new generation of short-range wireless communication technology, broke down the technical barriers between Bluetooth and Wi-Fi, acting as a "perfect combination" of the two, integrating their advantages and significantly improving power consumption, transmission speed, stability, and coverage. Furthermore, StarSpeed ​​modules have no specific restrictions on installation angle, further reducing assembly difficulty. For details on the specific device structure and working principle of StarSpeed ​​communication technology, please refer to existing technologies; they will not be elaborated upon here.

[0065] like Figure 1 and Figure 3As shown, in one implementation, the main control module 4 also includes a walking motor switch 43 and a working motor switch 44, both of which are electrically connected to the first control unit 41. The walking motor switch 43 is operated by the user to control the operation of the walking drive motor 12 (the walking motor switch 43 can control the start / stop and working gear of the walking drive motor 12, etc.); the working motor switch 44 is operated by the user to control the operation of the working drive motor 14 (the working motor switch 44 can control the start / stop and working gear of the working drive motor 14, etc.). The motor control module 3 also includes a first control circuit 32 and a second control circuit 33 (both the first control circuit 32 and the second control circuit 33 include various electronic components, such as resistors, inductors, and switching elements). The second control unit 31 is electrically connected to the walking drive motor 12 through the first control circuit 32, and the second control unit 31 is electrically connected to the working drive motor 14 through the second control circuit 33. Of course, the main control module 4 and the motor control module 3 also include other control elements and detection modules, which will not be described in detail here.

[0066] like Figure 1 and Figure 3 As shown, in one embodiment, the first power supply 15 is electrically connected to the second control unit 31 so that the second control unit 31 can obtain the status information (e.g., voltage, power, operating temperature, etc.) of the power module 15. The second power supply 45 is electrically connected to the first control unit 41 so that the first control unit 41 can obtain the status information (e.g., voltage, power, operating temperature, etc.) of the second power supply 45.

[0067] like Figure 1 and Figure 3 As shown, in one embodiment, a folding detection switch 16 is provided at the connection between the first connecting component 21 and the main body 1. The folding detection switch 16 is electrically connected to the second control unit 31. The folding detection switch 16 is used to detect the folded state of the connecting component 2. The folding detection switch 16 has a similar function to the telescopic switch component 6 mentioned above, both serving as safety switches. When the connecting component 2 is in a folded state or in a state between folding and unfolding, the power tool cannot move or work (i.e., the walking drive motor 12 and the working drive motor 14 are not allowed to operate); when the connecting component 2 is in an unfolded state, the power tool can move and work (i.e., the walking drive motor 12 and the working drive motor 14 are allowed to operate), to ensure safety.

[0068] like Figure 1 and Figure 3As shown, in one embodiment, the first wireless communication unit 51 is disposed on the connecting component 2. Specifically, the first wireless communication unit 51 is disposed on the main control module 4 (of course, the first wireless communication unit 51 can also be directly disposed on the body of the connecting component 2 or on other components of the connecting component 2). The second wireless communication unit 52 is disposed on the main body 1. Specifically, the second wireless communication unit 52 is disposed on the motor control module 3 (of course, the second wireless communication unit 52 can also be directly disposed on the body of the main body 1 or on other components of the main body 1). For example, the main control module 4 also includes a first circuit board (not shown), on which both the first control unit 41 and the first wireless communication unit 51 are disposed; the motor control module 3 also includes a second circuit board (not shown), on which both the second control unit 31 and the second wireless communication unit 52 are disposed. This setup is generally suitable for scenarios where the wireless communication module 5 uses a Bluetooth communication module, an RF communication module, or a star-flash communication module, and there are no specific requirements for the installation location. (When the infrared communication module uses this setup, the infrared transceiver units need to be aligned to ensure smooth transmission of infrared signals. However, since the connecting component 2 can extend and fold relative to the main body 1, the angle between the main control module 4 and the motor control module 3 will change during the extension and folding process, which may lead to the inability of the first infrared transceiver unit and the second infrared transceiver unit to perform normal infrared communication.)

[0069] In another implementation, the second wireless communication unit 52 is disposed on the connecting component 2. Specifically, the second wireless communication unit 52 can be disposed on the telescopic control component 23. Since the angle between the main control module 4 and the telescopic control component 23 does not change during the telescopic or folding process of the connecting component 2 (the two are always in a parallel state), disposing the first wireless communication unit 51 on the main control module 4 and the second wireless communication unit 52 on the telescopic control component 23 ensures that the first wireless communication unit 51 and the second wireless communication unit 52 are always aligned, thereby maintaining good communication between them. Since the second wireless communication unit 52 is not directly disposed on the main body 1 at this time, the second wireless communication unit 52 and the second control unit 31 need to be electrically connected via a cable (not shown). At this time, the cable can be routed through the first connecting component 21, that is, one end of the cable is electrically connected to the second wireless communication unit 52, and the other end of the cable passes through the first connecting component 21 and extends into the main body 1, and finally is electrically connected to the second control unit 31. This configuration is generally used when the wireless communication module 5 uses an infrared communication module. Of course, this configuration can also be used when the wireless communication module 5 uses a Bluetooth communication module, an RF communication module, or a star-flash communication module.

[0070] like Figure 1 and Figure 3 As shown, in one embodiment, the second power supply 45 is disposed on the main control module 4. Of course, the second power supply 45 can also be disposed directly on the body of the connecting component 2 or on other components of the connecting component 2 (for example, a battery compartment is additionally disposed on the connecting component 2, and the second power supply 45 is disposed in the battery compartment).

[0071] like Figure 1 and Figure 2 As shown, in one embodiment, the power tool is a lawnmower. The working component 13 includes a mowing blade, which is located at the bottom of the main body 1. The drive motor 14 drives the mowing blade to rotate for mowing. A grass collection box (not labeled) is located at the rear of the main body 1 to collect the grass cut by the mowing blade. Of course, in other embodiments, the power tool can also be a snowplow, etc., in which case the working component 13 can be replaced with a snowplow component, etc.

[0072] Second Embodiment

[0073] like Figure 6 As shown, the power tool provided in the second embodiment of this utility model is basically the same as that in the first embodiment, except that the type, specific structure, working principle and arrangement of the telescopic switch assembly 6 are different.

[0074] In this embodiment, the telescopic switch assembly 6 is a photoelectric switch assembly. The first position signal component 61 and / or the second position signal component 62 include a light emitting module 6A and a light receiving module 6B. The light emitting module 6A is used to emit light (infrared or visible light), and the light receiving module 6B is used to receive the light emitted by the light emitting module 6A. The main control module 4 is electrically connected to the light emitting module 6A and the light receiving module 6B respectively. Specifically, the main control module 4 is electrically connected to the light emitting module 6A and the light receiving module 6B respectively through wires 7, which run through the second connecting assembly 22. When the second connecting assembly 22 is in the first state, the light receiving module 6B can generate a photoelectric change signal (i.e., the first signal) and transmit it to the main control module 4. The main control module 4 determines that the second connecting assembly 22 has been extended to the correct position based on this signal.

[0075] Specifically, a photoelectric switch is a sensor that uses changes in light intensity to realize changes in electricity. It first converts the change in the measured quantity into a change in light signal, and then uses photoelectric elements to further convert the light signal into an electrical signal. A photoelectric switch consists of three parts: a transmitter, a receiver, and a detection circuit. The transmitter continuously emits a light beam in a specific direction, the beam originating from a semiconductor light source such as a light-emitting diode (LED) or an infrared emitting diode (IRD). The receiver is composed of photodiodes, phototransistors, etc. Optical elements are mounted in front of the receiver, and the detection circuit is located behind the receiver, capable of filtering out the valid signal and applying it.

[0076] Common photoelectric switches include through-beam photoelectric switches, slotted photoelectric switches, specular reflection photoelectric switches, and diffuse reflection photoelectric switches. Through-beam photoelectric switches consist of a transmitter and receiver spaced apart, primarily detecting whether the light beam is interrupted; if interrupted, a switching signal change is generated. Specular reflection and slotted photoelectric switches operate on the same principle as through-beam switches, generating a switching signal change through beam interruption; however, they each have their own characteristics. Specular reflection photoelectric switches can distinguish opaque objects, have a long effective range, and are less susceptible to interference; slotted photoelectric switches can reliably detect high-speed changes and distinguish between transparent and translucent objects. Diffuse reflection photoelectric switches emit a light beam, which is diffusely reflected from the target. The switching state changes only when sufficient combined light returns to the receiver (e.g., when a certain location on the target is smoother or has higher reflectivity). For the specific structure and working principle of photoelectric switches, please refer to existing technologies, which will not be elaborated here.

[0077] like Figure 6 As shown, in one embodiment, the telescopic switch assembly 6 is a through-beam photoelectric switch assembly; one of the first position signal component 61 and the second position signal component 62 includes a light emitting module 6A, and the other includes a light receiving module 6B (the positions of the light emitting module 6A and the light receiving module 6B are interchangeable). When the second connecting assembly 22 is in the first state, the light emitting module 6A corresponds to the light receiving module 6B, enabling the light receiving module 6B to receive the light emitted by the light emitting module 6A, thereby generating a photoelectric change signal and transmitting it to the main control module 4. The first position signal component 61 is disposed within the crossbeam 231, and the second position signal component 62 is disposed within the second connecting assembly 22. The second connecting assembly 22 has a through hole 220 penetrating its sidewall, which corresponds to the second position signal component 62 and is located between the second position signal component 62 and the first position signal component 61; through this through hole 220, the light receiving module 6B can receive the light emitted by the light emitting module 6A.

[0078] Specifically, when the light emitting module 6A and the light receiving module 6B do not correspond, the light receiving module 6B cannot receive the light emitted by the light emitting module 6A due to the obstruction of the second connecting component 22 and / or the first connecting component 21. At this time, the light receiving module 6B does not send an electrical signal to the main control module 4. When the light emitting module 6A and the light receiving module 6B correspond, the light receiving module 6B can receive the light emitted by the light emitting module 6A through the through hole 220. At this time, the light receiving module 6B sends an electrical signal to the main control module 4, and the main control module 4 determines that the second connecting component 22 has been extended into place.

[0079] like Figure 7 As shown, in another embodiment, the telescopic switch assembly 6 is a slotted photoelectric switch assembly; one of the first position signal component 61 and the second position signal component 62 includes a light emitting module 6A and a light receiving module 6B (the light emitting module 6A and the light receiving module 6B are integrated together) arranged at intervals opposite each other, and the other includes a telescopic light-shielding member 6C (specifically, it can adopt a structure similar to a spring pin, using a spring to drive the light-shielding member 6C to telescopically move). When the second connecting component 22 is in the first state, the light-shielding member 6C can extend between the light emitting module 6A and the light receiving module 6B, so that the light receiving module 6B cannot receive the light emitted by the light emitting module 6A, thereby causing the light receiving module 6B to generate a photoelectric change signal and transmit it to the main control module 4. The first position signal component 61 is disposed inside the crossbeam 231, and the second position signal component 62 is disposed inside the second connecting assembly 22. The second connecting assembly 22 is provided with a through hole 220 penetrating its side wall. The through hole 220 corresponds to the second position signal component 62 and is located between the second position signal component 62 and the first position signal component 61. The light shield 6C can pass through the through hole 220 and extend into the space between the light emitting module 6A and the light receiving module 6B.

[0080] Specifically, when the light-shielding component 6C does not correspond to the light-emitting module 6A and the light-receiving module 6B, that is, when the light-shielding component 6C does not extend between the light-emitting module 6A and the light-receiving module 6B (at this time, the light-shielding component 6C will retract into the second connecting component 22 and abut against the inner wall of the first connecting component 21), the light-receiving module 6B can receive the light emitted by the light-emitting module 6A, and at this time, the light-receiving module 6B sends an electrical signal to the main control module 4; when the light-shielding component 6C corresponds to the light-emitting module 6A and the light-receiving module 6B, the light-shielding component 6C extends through the through hole 220 and between the light-emitting module 6A and the light-receiving module 6B to block the light, so that the light-receiving module 6B cannot receive the light emitted by the light-emitting module 6A, at this time the light-receiving module 6B does not send an electrical signal to the main control module 4, and the main control module 4 determines that the second connecting component 22 has extended into place.

[0081] like Figure 8As shown, in another embodiment, the telescopic switch assembly 6 is a mirror-reflective photoelectric switch assembly; one of the first position signal component 61 and the second position signal component 62 includes a light emitting module 6A and a light receiving module 6B (the light emitting module 6A and the light receiving module 6B are integrated together), and the other includes a reflector 6D. When the second connection component 22 is in the first state, both the light emitting module 6A and the light receiving module 6B correspond to the reflector 6D, so that the light emitted by the light emitting module 6A can be reflected by the reflector 6D to the light receiving module 6B, thereby causing the light receiving module 6B to generate a photoelectric change signal and transmit it to the main control module 4. The first position signal component 61 is disposed inside the crossbeam 231, and the second position signal component 62 is disposed inside the second connecting assembly 22. The second connecting assembly 22 is provided with a through hole 220 penetrating its side wall. The through hole 220 corresponds to the second position signal component 62 and is located between the second position signal component 62 and the first position signal component 61. Through the through hole 220, the light emitted by the light emitting module 6A can be reflected by the reflector 6D to the light receiving module 6B.

[0082] Specifically, when the light emitting module 6A and the light receiving module 6B do not correspond to the reflector 6D, the light receiving module 6B cannot receive the light emitted by the light emitting module 6A due to the obstruction of the second connecting component 22 and / or the first connecting component 21. At this time, the light receiving module 6B does not send an electrical signal to the main control module 4. When the light emitting module 6A and the light receiving module 6B correspond to the reflector 6D, the light emitted by the light emitting module 6A can pass through the through hole 220 and be reflected by the reflector 6D to the light receiving module 6B. At this time, the light receiving module 6B sends an electrical signal to the main control module 4, and the main control module 4 determines that the second connecting component 22 has been extended into place.

[0083] like Figure 9As shown, in another embodiment, the telescopic switch assembly 6 is a diffuse reflection photoelectric switch assembly; the first position signal component 61 includes a light emitting module 6A and a light receiving module 6B (the light emitting module 6A and the light receiving module 6B are integrated together), and the second position signal component 62 includes a bright part 221 disposed on the surface of the second connecting component 22; the bright part 221 may be formed by polishing the surface of the second connecting component 22, so that the reflectivity of the bright part 221 is greater than the reflectivity of other parts of the second connecting component 22 (the bright part 221 is smoother). When the second connecting component 22 is in the first state, both the light emitting module 6A and the light receiving module 6B correspond to the bright part 221, so that the light emitted by the light emitting module 6A can be reflected by the bright part 221 to the light receiving module 6B, thereby causing the light receiving module 6B to generate a photoelectric change signal. The first position signal component 61 is disposed inside the crossbeam 231, and the second position signal component 62 is disposed inside the second connecting component 22. That is, the bright part 221 is disposed on the inner surface of the second connecting component 22 (of course, the bright part 221 can also be disposed on the outer surface of the second connecting component 22). The second connecting component 22 is provided with a through hole 220 penetrating its side wall. The through hole 220 corresponds to the second position signal component 62 and is located between the second position signal component 62 and the first position signal component 61. Through the through hole 220, the light emitted by the light emitting module 6A can be reflected by the bright part 221 to the light receiving module 6B.

[0084] Specifically, when the light emitting module 6A and the light receiving module 6B do not correspond to the bright part 221, the light emitted by the light emitting module 6A will be diffusely reflected on the obstruction, and there will not be enough light to return to the light receiving module 6B. At this time, the light receiving module 6B does not send an electrical signal to the main control module 4. When the light emitting module 6A and the light receiving module 6B correspond to the bright part 221, the light emitted by the light emitting module 6A can be reflected by the bright part 221 to the light receiving module 6B (that is, the light receiving module 6B can receive enough light). At this time, the light receiving module 6B sends an electrical signal to the main control module 4, and the main control module 4 determines that the second connecting component 22 has been extended into place.

[0085] like Figures 6 to 9 As shown, in one embodiment, the main control module 4 includes a first control unit 41, an optical emitting circuit 462, and an optical receiving circuit 463. The first control unit 41 is electrically connected to the optical emitting circuit 462 and the optical receiving circuit 463, respectively. The optical emitting circuit 462 and the optical receiving circuit 463 are electrically connected to the optical emitting module 6A and the optical receiving module 6B, respectively, through wires 7.

[0086] Of course, in other embodiments, the photoelectric switch assembly may also have other structural forms.

[0087] The other structures and working principles of this embodiment are the same as or similar to those of the first embodiment, and will not be described in detail here.

[0088] Third Embodiment

[0089] like Figure 10 As shown, the power tool provided in the third embodiment of this utility model is basically the same as that in the second embodiment, except that the type of telescopic switch assembly 6 is different.

[0090] In this embodiment, the retractable switch assembly 6 is a laser transceiver assembly. One of the first position signal component 61 and the second position signal component 62 includes a laser emitting module 6E, and the other includes a laser receiving module 6F (the positions of the laser emitting module 6E and the laser receiving module 6F are interchangeable). The laser emitting module 6E emits laser light, and the laser receiving module 6F receives the laser light emitted by the laser emitting module 6E. The main control module 4 is electrically connected to the laser emitting module 6E and the laser receiving module 6F. Specifically, the main control module 4 is electrically connected to the laser emitting module 6E and the laser receiving module 6F respectively via wires 7, which run through the second connecting assembly 22. When the second connecting assembly 22 is in the first state, the laser emitting module 6E corresponds to the laser receiving module 6F, enabling the laser receiving module 6F to receive the laser light emitted by the laser emitting module 6E. This causes the laser receiving module 6F to generate a photoelectric change signal (i.e., the first signal) and transmit it to the main control module 4. Based on this signal, the main control module 4 determines that the second connecting assembly 22 has extended to its designated position. The first position signal component 61 is disposed inside the crossbeam 231, and the second position signal component 62 is disposed inside the second connecting component 22. The second connecting component 22 is provided with a through hole 220 penetrating its side wall. The through hole 220 corresponds to the second position signal component 62 and is located between the second position signal component 62 and the first position signal component 61. Through the through hole 220, the laser receiving module 6F can receive the laser emitted by the laser emitting module 6E.

[0091] Specifically, when the laser emitting module 6E and the laser receiving module 6F do not correspond, the laser receiving module 6F cannot receive the laser emitted by the laser emitting module 6E due to the obstruction of the second connecting component 22 and / or the first connecting component 21. At this time, the laser receiving module 6F does not send an electrical signal to the main control module 4. When the laser emitting module 6E and the laser receiving module 6F correspond, the laser receiving module 6F can receive the laser emitted by the laser emitting module 6E through the through hole 220. At this time, the laser receiving module 6F sends an electrical signal to the main control module 4, and the main control module 4 determines that the second connecting component 22 has been extended into place.

[0092] In one implementation, the main control module 4 includes a first control unit 41, a laser signal modulation module 464, and a laser signal demodulation module 465. The first control unit 41 is electrically connected to both the laser signal modulation module 464 and the laser signal demodulation module 465. The laser signal modulation module 464 and the laser signal demodulation module 465 are electrically connected to the laser transmitting module 6E and the laser receiving module 6F respectively via wires 7. The structure and working principle of the laser transceiver assembly are similar to those of a photoelectric switch; for details on the specific structure and working principle of the laser transceiver assembly, please refer to existing technologies, which will not be elaborated here.

[0093] The other structures and working principles of this embodiment are the same as or similar to those of the first embodiment, and will not be described in detail here.

[0094] Fourth embodiment

[0095] like Figure 11 As shown, the power tool provided in the fourth embodiment of this utility model is basically the same as that in the second embodiment, except that the type, specific structure and working principle of the telescopic switch assembly 6 are different.

[0096] In this embodiment, the retractable switch assembly 6 is a Hall effect sensor assembly. One of the first position signal component 61 and the second position signal component 62 includes a Hall effect switch 6G, and the other includes a magnetic element 6H. The magnetic element 6H can specifically be a magnet, a steel magnet, etc. (The positions of the Hall effect switch 6G and the magnetic element 6H can be interchanged; since the main control module 4 does not need to be electrically connected to the magnetic element 6H, preferably, the second position signal component 62 is the Hall effect switch 6G, and the first position signal component 61 is the magnetic element 6H, to facilitate wiring). The main control module 4 is electrically connected to the Hall effect switch 6G. Specifically, the main control module 4 is electrically connected to the Hall effect switch 6G through a wire 7, which runs through the second connection assembly 22. When the second connection assembly 22 is in the first state, the Hall effect switch 6G corresponds to the magnetic element 6H (the straight-line distance between them is shortest), causing the Hall effect switch 6G to generate a Hall signal (specifically a voltage signal; i.e., the first signal) and transmit it to the main control module 4. The main control module 4 determines that the second connection assembly 22 has extended to its designated position based on this signal. The first position signal component 61 is disposed inside the crossbeam 231, and the second position signal component 62 is disposed inside the second connecting assembly 22; meanwhile, since the Hall switch 6G and the magnetic element 6H are non-contact sensing elements, there is no need to make additional openings on the second connecting assembly 22.

[0097] Specifically, a Hall effect switch is an electronic switch that uses a magnetic field as a sensor to control a device by detecting changes in the magnetic field strength. It is a non-contact switch that can detect the presence of an object. The principle of a Hall effect switch is as follows: it has a built-in magnet and a miniature electronic component. When it approaches an external magnetic field, it generates a voltage. When the Hall effect switch 6G does not correspond to the magnetic component 6H, due to the greater linear distance between them, the Hall effect switch 6G outputs a high level to the main control module 4. When the Hall effect switch 6G corresponds to the magnetic component 6H, due to the shortest linear distance between them, the Hall effect switch 6G outputs a low level to the main control module 4 (i.e., a level change occurs). Based on this, the main control module 4 determines that the second connecting component 22 has extended into place.

[0098] In one implementation, the main control module 4 includes a first control unit 41 and a Hall signal receiving circuit 466. The first control unit 41 is electrically connected to the Hall signal receiving circuit 466, and the Hall signal receiving circuit 466 is electrically connected to the Hall switch 6G via a wire 7. For the specific structure and working principle of the Hall sensing component, please refer to existing technologies, which will not be elaborated here.

[0099] The other structures and working principles of this embodiment are the same as or similar to those of the first embodiment, and will not be described in detail here.

[0100] Fifth Embodiment

[0101] like Figure 12 As shown, the power tool provided in the fifth embodiment of this utility model is basically the same as that in the fourth embodiment, except that the type, specific structure and working principle of the telescopic switch assembly 6 are different.

[0102] In this embodiment, the retractable switch assembly 6 is an NFC (Near Field Communication) sensing assembly. One of the first position signal component 61 and the second position signal component 62 includes a radio frequency transceiver module 6I, and the other includes an NFC sensing element 6J. The radio frequency transceiver module 6I specifically includes an antenna matching circuit capable of transmitting and receiving radio frequency signals (the antenna matching circuit is generally integrated on a circuit board). The NFC sensing element 6J can specifically be an NFC card, NFC tag, etc., capable of passively receiving radio frequency signals (the positions of the radio frequency transceiver module 6I and the NFC sensing element 6J can be interchanged; since the main control module 4 does not need to be electrically connected to the NFC sensing element 6J, preferably, the second position signal component 62 is the radio frequency transceiver module 6I, and the first position signal component 61 is the NFC sensing element 6J, to facilitate wiring). The main control module 4 is electrically connected to the radio frequency transceiver module 6I. Specifically, the main control module 4 is electrically connected to the radio frequency transceiver module 6I through a wire 7, which runs through the second connection assembly 22. When the second connecting component 22 is in the first state, the radio frequency transceiver module 6I corresponds to the NFC sensing element 6J (the straight-line distance between them is the shortest), causing the radio frequency transceiver module 6I to generate an electrical signal (specifically a radio frequency signal; i.e., the first signal) and transmit it to the main control module 4. The main control module 4 determines that the second connecting component 22 has extended into place based on this signal. The first position signal component 61 is disposed within the crossbeam 231, and the second position signal component 62 is disposed within the second connecting component 22. Meanwhile, since the radio frequency transceiver module 6I and the NFC sensing element 6J are non-contact sensing elements, there is no need to make additional openings on the second connecting component 22.

[0103] Specifically, in this embodiment, the NFC sensing component adopts a passive working mode, that is, the radio frequency transceiver module 6I is the NFC initiating device (also known as the master device), and the NFC sensing element 6J is the NFC target device (also known as the slave device). The master device needs to be powered, and the master device can convert electrical energy into a radio frequency field and radiate it to the slave device. The slave device does not actively generate a radio frequency field, so it does not need to be powered. After receiving the radio frequency signal sent by the master device, the slave device converts the radio frequency signal into electrical energy to power the circuit of the slave device, and then receives the data sent by the master device. Using load modulation technology, the slave device transmits the data back to the master device at the same speed, thereby realizing the communication between the master device and the slave device. Since the slave device does not actively generate a radio frequency field, but passively receives the radio frequency field generated by the master device, it is called the passive working mode.

[0104] When the RF transceiver module 6I does not correspond to the NFC sensing element 6J, the RF transceiver module 6I cannot sense the NFC sensing element 6J due to the large straight-line distance between them (i.e., the two cannot communicate). At this time, the RF transceiver module 6I does not output an electrical signal to the main control module 4. When the RF transceiver module 6I corresponds to the NFC sensing element 6J, the RF transceiver module 6I can sense the NFC sensing element 6J due to the shortest straight-line distance between them. At this time, the RF transceiver module 6I outputs an electrical signal to the main control module 4, and the main control module 4 determines that the second connecting component 22 has been extended into place.

[0105] In one implementation, the main control module 4 includes a first control unit 41 and an NFC signal receiving circuit 467. The first control unit 41 is electrically connected to the NFC signal receiving circuit 467, and the NFC signal receiving circuit 467 is electrically connected to the radio frequency transceiver module 6I via a wire 7. For the specific structure and working principle of the NFC sensing component, please refer to existing technologies, which will not be elaborated here.

[0106] The other structures and working principles of this embodiment are the same as or similar to those of the first embodiment, and will not be described in detail here.

[0107] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. An electric tool, comprising a body (1), a connection component (2) connected to the body (1), and a main control module (4) disposed on the connection component (2); The connecting component (2) includes a first connecting component (21) and a second connecting component (22). One end of the first connecting component (21) is connected to the main body (1), and the other end of the first connecting component (21) is retractably connected to one end of the second connecting component (22). The main control module (4) is installed at the end of the second connecting component (22) away from the first connecting component (21). A telescopic control component (23) is provided at the connection between the first connecting component (21) and the second connecting component (22). The telescopic control component (23) includes a crossbeam (231) which is connected to the first connecting component (21). Its features are, The power tool also includes a telescopic switch assembly (6), which is electrically connected to the main control module (4). The telescopic switch assembly (6) includes a first position signal component (61) disposed on the crossbeam (231) and a second position signal component (62) disposed on the second connection assembly (22). When the second connection component (22) is in the first state, the first position signal component (61) corresponds to the second position signal component (62), and at this time the telescopic switch component (6) generates a first signal and transmits it to the main control module (4).

2. The power tool as described in claim 1, characterized in that, The main body (1) is provided with the first connecting component (21) and the second connecting component (22) on both sides of the main body (1), and the two ends of the crossbeam (231) are respectively connected to the first connecting component (21) on both sides of the main body (1). The first position signal component (61) includes a conductive element (611) disposed in the crossbeam (231), and the second position signal component (62) includes a docking part (621) disposed on the second connecting assembly (22) on opposite sides. The docking parts (621) on the second connecting assembly (22) on opposite sides are electrically connected to the main control module (4). When the second connecting component (22) is in the first state, the two ends of the conductive element (611) are electrically connected to the mating parts (621) on the two sides of the second connecting component (22).

3. The power tool as described in claim 2, characterized in that, The second connecting component (22) is made of conductive material, and the docking part (621) is electrically connected to the main control module (4) through the second connecting component (22); And / or, the docking part (621) is electrically connected to the main control module (4) via a wire (7) located inside the second connection assembly (22).

4. The power tool as described in claim 1, characterized in that, The telescopic switch assembly (6) is a photoelectric switch assembly. The first position signal component (61) and / or the second position signal component (62) include a light emitting module (6A) and a light receiving module (6B). The main control module (4) is electrically connected to the light emitting module (6A) and the light receiving module (6B). When the second connection component (22) is in the first state, the optical receiving module (6B) can generate photoelectric change signals and transmit them to the main control module (4).

5. The power tool as described in claim 4, characterized in that, The telescopic switch assembly (6) is a photoelectric switch assembly, wherein one of the first position signal component (61) and the second position signal component (62) includes the light emitting module (6A) and the other includes the light receiving module (6B); When the second connecting component (22) is in the extended state, the light emitting module (6A) corresponds to the light receiving module (6B), enabling the light receiving module (6B) to receive the light emitted by the light emitting module (6A), thereby causing the light receiving module (6B) to generate a photoelectric change signal.

6. The power tool as claimed in claim 1, characterized in that, The telescopic switch assembly (6) is a laser transceiver assembly; one of the first position signal component (61) and the second position signal component (62) includes a laser emitting module (6E) and the other includes a laser receiving module (6F); the main control module (4) is electrically connected to the laser emitting module (6E) and the laser receiving module (6F); When the second connection component (22) is in the first state, the laser emitting module (6E) corresponds to the laser receiving module (6F), enabling the laser receiving module (6F) to receive the laser emitted by the laser emitting module (6E), thereby enabling the laser receiving module (6F) to generate a photoelectric change signal and transmit it to the main control module (4).

7. The power tool as claimed in any one of claims 2-6, characterized in that, The second position signal component (62) is disposed within the second connecting component (22). The second connecting component (22) has a through hole (220) penetrating its sidewall. The through hole (220) corresponds to the second position signal component (62) and is located between the second position signal component (62) and the first position signal component (61).

8. The power tool as claimed in claim 1, characterized in that, The telescopic switch assembly (6) is a Hall sensor assembly; one of the first position signal component (61) and the second position signal component (62) includes a Hall switch (6G) and the other includes a magnetic element (6H); the main control module (4) is electrically connected to the Hall switch (6G); When the second connection component (22) is in the first state, the Hall switch (6G) corresponds to the magnetic element (6H), causing the Hall switch (6G) to generate a Hall signal and transmit it to the main control module (4).

9. The power tool as claimed in claim 1, characterized in that, The retractable switch assembly (6) is an NFC sensing assembly; one of the first position signal component (61) and the second position signal component (62) includes a radio frequency transceiver module (6I), and the other includes an NFC sensing element (6J); the main control module (4) is electrically connected to the radio frequency transceiver module (6I). When the second connection component (22) is in the first state, the radio frequency transceiver module (6I) corresponds to the NFC sensing element (6J), causing the radio frequency transceiver module (6I) to generate an electrical signal and transmit it to the main control module (4).

10. The power tool as claimed in claim 1, characterized in that, The power tool is a lawnmower or a snowplow.

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