Power tool and lawn mower

Abstract

The application discloses an electric tool and a mower, which comprise a main machine, a working assembly and a control unit; a motor is used for providing driving force for the working assembly; a first switch is used for controlling the safe starting of the main machine; and a second switch is used for controlling the power-on state of the main machine; wherein the control unit is configured to: acquire a first switch signal capable of indicating the switch state of the first switch and a second switch signal capable of indicating the switch state of the second switch; after the first switch signal indicates that the first switch is in a closed state, the second switch signal is detected to indicate that the second switch is in a closed state, and the motor is controlled to start working. The working machine has high reliability and stable working performance.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a garden tool, for example, to a lawn mower. BACKGROUND

[0002] The lawn mower is generally used by the user to trim the lawn at home. The commonly used lawn mower has a main machine and an operating handle, and the operating handle can be detachably connected to the main machine. The user can control the walking and mowing of the lawn mower by operating the switch on the handle. In order to prevent the accidental start of the lawn mower from causing a safety accident, a safety switch is usually provided on the handle device for regulatory considerations.

[0003] The commonly used safety switch is a mechanical Lock-off switch. After the Lock-off switch is pressed down, the user operates the main machine switch to drive the mechanical structure in the Lock-off switch to pop out to complete the start operation. However, the mechanical structure in the Lock-off switch is complex, and after the user releases the trigger, the structure may be stuck and cannot be bounced back, thereby affecting the normal on-off operation of the lawn mower. SUMMARY

[0004] In order to solve the problems in the prior art, the present application provides a lawn mower with high reliability and stable working performance.

[0005] In order to achieve the above-mentioned target, the present application adopts the following technical scheme:

[0006] An electric tool, comprising: a main machine comprising a working assembly and a control unit; a motor for providing driving force for the working assembly; a first switch for controlling the safety start of the main machine; a second switch for controlling the power-on state of the main machine; wherein the control unit is configured to: acquire a first switch signal capable of indicating the switch state of the first switch and a second switch signal capable of indicating the switch state of the second switch; after the first switch signal indicates that the first switch is in a closed state, and the second switch signal indicates that the second switch is in a closed state, control the motor to start working.

[0007] Further, the first switch is a signal switch.

[0008] Further, it further comprises: a handle device connected to the main machine; a signal unit provided on the handle device, for acquiring the switch signals of the first switch and the second switch; a communication bus connected between the signal unit and the control unit, for transmitting the switch signals on the signal unit to the control unit.

[0009] Further, during the working of the motor, the first switch can be in an open state.

[0010] Further, the working assembly comprises a cutting assembly and a walking assembly; the motor comprises: a first motor configured to provide driving force for the cutting assembly;

[0011] a second motor configured to provide driving force for the walking assembly;

[0012] The control unit is configured to:

[0013] detect, after the first switch signal indicates that the first switch is in a closed state, that the second switch signal indicates that the second switch is in a closed state, and control the first motor to start working.

[0014] Further, the garden tool further comprises: a third switch configured to control the rotation angle of the handle device on the main machine; and a fourth switch configured to control the extension state of the handle device; the control unit is configured to: acquire a third switch signal capable of indicating the switch state of the third switch and a fourth switch signal capable of indicating the switch state of the fourth switch; when the third switch is in a closed state and the fourth switch is in an open state, and in sequence, the first switch is in a closed state and the second switch is in a closed state are detected, the first motor is controlled to start working; when the third switch is in an open state and / or the fourth switch is in a closed state, the first motor is controlled to stop rotating.

[0015] Further, the garden tool further comprises: a fifth switch configured to control the power-on state of the second motor; the control unit is configured to: acquire a fifth switch signal capable of indicating the switch state of the fifth switch; when the third switch is closed and the fifth switch signal indicating that the fifth switch is closed is detected, the second motor is controlled to start working.

[0016] Further, the control unit is configured to: when the third switch is in an open state and / or the fifth switch is in an open state, the second motor is controlled to stop rotating.

[0017] A garden tool comprises: a main machine comprising a working assembly and a control unit; a motor configured to provide driving force for the working assembly; a handle device connected to the main machine; a first switch provided on the handle device and configured to control the safe start of the main machine; and a second switch provided on the handle device and configured to control the power-on state of the main machine; wherein the control unit is configured to: acquire a first switch signal capable of indicating the switch state of the first switch and a second switch signal capable of indicating the switch state of the second switch; detect, after the first switch signal indicates that the first switch is in a closed state, that the second switch signal indicates that the second switch is in a closed state, and control the motor to start working.

[0018] The lawn mower comprises a main machine, a cutting assembly for cutting vegetation, a walking assembly comprising a first walking wheel and a second walking wheel, a first motor for controlling the cutting assembly to perform a cutting action, a second motor for controlling the walking assembly to walk, a first switch arranged on the handle device for controlling the safe start of the main machine, a second switch arranged on the handle device for controlling the power-on state of the main machine, and a control unit arranged on the main machine, wherein the control unit is configured to acquire a first switch signal capable of indicating the switch state of the first switch and a second switch signal capable of indicating the switch state of the second switch, and control the first motor to start working after the second switch signal indicates that the second switch is in a closed state after the first switch signal indicates that the first switch is in a closed state.

[0019] Further, the lawn mower further comprises a signal unit arranged on the handle device for acquiring the switch signals of the first switch and the second switch on the handle device, and a communication bus connected between the signal unit and the control unit for transmitting the switch signals on the signal unit to the control unit.

[0020] The lawn mower has the advantages that the electronic switch is used to replace the mechanical safety switch, and the working performance and reliability of the machine are improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a perspective view of the lawn mower;

[0022] Figure 2 is Figure 1 is a structural view of the handle device of the lawn mower in

[0023] Figure 3 is Figure 1 is a schematic view of the circuit control of the lawn mower in

[0024] Figure 4 is Figure 1 is a flow chart of the control method of the lawn mower in

[0025] Figure 5 is Figure 1 is a flow chart of the control method of the lawn mower in

[0026] REFERENCE SIGNS:

[0027] 100 - lawn mower;

[0028] 10 - handle device; 11 - operating member; 111 - grip; 112 - first mounting portion; 113 - second mounting portion; 11a - first straight line; 11b - second straight line; 121 - first connecting rod; 122 - second connecting rod; 13 - housing; 14 - first switch; 15 - second switch; 16 - third switch; 17 - fourth switch; 18 - fifth switch; 19 - speed regulating switch; 10a - signal unit;

[0029] 20 - main machine; 211 - cutting assembly; 212 - traveling assembly; 22 - control unit; 221 - first motor; 222 - second motor; 23 - chassis; 241 - first drive circuit; 242 - second drive circuit;

[0030] 30 - communication bus. DETAILED DESCRIPTION

[0031] The application will be described in greater detail with reference to the accompanying drawings and specific embodiments. It can be understood that the specific embodiments described herein are merely illustrative of the application and are not to be used to limit the scope of the application. In addition, it should be noted that, for the sake of brevity, only the parts of the drawings that are necessary for an understanding of the application have been shown.

[0032] It can be understood that the rear walking self-propelled working machine protected by the present application can be a large or medium-sized garden electric tool, such as a snow blower, a blower, a mower, etc. The present embodiment will be described taking the mower as an example.

[0033] Referring to Figure 1 The mower 100 shown in the figure comprises a main machine 20 and a handle device 10. The main machine 20 at least comprises a working assembly and a control unit 22. The working assembly can comprise a cutting assembly 211 such as a cutting blade, and a traveling assembly 212 such as a traveling wheel. The control unit 22 can comprise a first motor 221 for controlling the cutting assembly 211 to perform a cutting function, and a second motor 222 for controlling the traveling assembly 212 to travel. The main machine 20 can further comprise a chassis 23 capable of accommodating the cutting assembly 211, and the traveling assembly 212 capable of supporting the chassis 23.

[0034] The handle device 10 is connected to the rear end of the main machine 20 for a user to operate. Optionally, the handle device 10 can also be rotated relative to the main machine 20 to adapt to users with different heights. The handle device 10 can also be rotated relative to the main machine 20 to a folded state, at which time the mower 100 occupies a smaller space, thereby facilitating the storage of the mower. Optionally, the handle device 10 is a telescopic handle, and by adjusting the telescopic state of the handle device 10 and cooperating with the rotational position of the handle device 10 relative to the main machine 20, the comfort of users with different heights using the mower 100 can be further increased.

[0035] In one embodiment, as shown in Figures 1 to 2 The handle device 10 comprises at least an operating member 11, a connecting rod assembly 12 and a housing 13. The operating member 11 comprises a holding portion 111 for a user to hold, a first mounting portion 112 and a second mounting portion 113 arranged at two ends of the holding portion 111 respectively. In this embodiment, the first mounting portion 112 extends along a first straight line 11a, and the second mounting portion 113 extends along a second straight line 11b parallel to the first straight line 11a. When the user needs to push the mower to mow, the user can stand at the rear side of the handle device 10 and hold the holding portion 111 with hands to apply a forward pushing force to the holding portion 111, so as to drive the mower to walk on the ground. The connecting rod assembly 12 is used to connect the operating member 11 and the main machine 20. The connecting rod assembly comprises a first connecting rod 122 and a second connecting rod 121. One end of the first connecting rod 122 is connected to the main machine 20, and the other end is connected to the first mounting portion 112. One end of the second connecting rod 121 is connected to the main machine 20, and the other end is connected to the second mounting portion 113. The first connecting rod 122 extends along the first straight line 11a, and the second connecting rod 121 extends along the second straight line 11b parallel to the first straight line 11a. The housing 13 extends along the left-right direction, and the housing 13 connects the first connecting rod 121 and the second connecting rod 122. The housing 13 is formed with a first accommodating cavity 131, and the first connecting rod 122 extends into the first accommodating cavity 131 along the first straight line 11a.

[0036] In this embodiment, as shown in Figure 2As shown, the handle device 10 is provided with a plurality of switches, which can specifically include a second switch 15 mainly used for controlling the power-on state of the main machine 20. Optionally, the second switch 15 is a trigger main switch. The handle device 10 is also provided with a first switch 14 mainly used for controlling the safe start of the main machine 20, so as to avoid the second switch 15 being accidentally triggered to start the main machine 20, thereby causing a safety hazard. In an embodiment, the first switch 14 is a signal switch. The first switch 14 and the second switch 15 are two independent electronic switches. Further, the handle device 10 is also provided with a trigger piece 161 for triggering a third switch 16. The third switch 16 mainly controls the fixed angle of the handle device 10 on the main machine 20. In an embodiment, the third switch 16 is arranged in the housing of the main machine 20 and can be triggered by the trigger piece 161 to change the conduction state. For example, when the user adjusts the trigger piece 161 to make the third switch 16 in an open state, the handle device 10 can be adjusted to a state of completely fitting the main machine 20 or a state of being approximately perpendicular to the main machine 20. When the user adjusts the trigger piece 161 to make the third switch 16 closed, the handle device 10 can be adjusted between several preset states relative to the main machine 20, and in the above-mentioned several preset states, the handle device 10 has an included angle with the plane on which the main machine 20 is located in the first straight line 11a or the second straight line 11b direction greater than 90°. That is, when the third switch 16 is open, the handle device 10 is in a state not conducive to operating the main machine 20 to walk, and when the third switch 17 is closed, the handle device 10 is in a state conducive to operating the main machine 20 to walk. In an embodiment, the included angle of the handle device 10 with the plane on which the main machine 20 is located in the first straight line 11a or the second straight line 11b direction can be set as the fixed angle of the handle device 10 relative to the main machine 20. Thus, when the third switch 16 is open, the fixed angle of the handle device 10 relative to the main machine 20 is approximately greater than or equal to 0° and less than or equal to 90°, and when the third switch 16 is closed, the fixed angle of the handle device 10 relative to the main machine 20 is approximately greater than 90° or greater than 90° and less than 180°. Further, the handle device 10 is also provided with a fourth switch 17 for controlling the telescopic state of the handle device 10, which is preferably arranged in the first accommodating cavity 131 formed by the housing 13. In this application, when the fourth switch 17 is in an open state, the handle device 10 is in a completely unfolded state, and when the fourth switch 17 is in a closed state, the handle device 10 can be telescoped at will, i.e., can be adjusted to a completely telescopic state, thereby facilitating storage. Further, the handle device 10 can also be provided with a fifth switch 18, which is a self-walking control switch of the mower 100 and can control the second motor 222 to start running. Optionally, the handle device 10 is also provided with a speed regulating switch 19 mainly used for changing the rotating speed of the second motor 222 during the walking process of the mower 100, thereby controlling the walking speed of the mower 100.Optionally, the speed control switch 19 can have multiple speed settings, such as 0, 1, 2, etc. When in the 0 setting, the speed of the second motor 222 is 0, and the lawnmower 100 stops moving.

[0037] It should be noted that the position of the aforementioned switch on the handle device 10 can be adjusted according to the different overall layout of the lawnmower 100, and this application does not impose any restrictions.

[0038] In one embodiment, such as Figure 3 As shown, the control board of the handle device 10 is equipped with a signal unit 10a, and the switching signals of one or more switches on the handle device 10 can be transmitted to the signal unit 10a. A communication bus 30 is provided between the handle device 10 and the main unit 20 of the lawnmower 100. The communication bus 30 can transmit signals from the handle device 10 to the control unit 22 of the main unit 20, so that the control unit 22 can control the mowing action of the cutting component 211 or control the walking action of the walking component 212. Optionally, a bus interface is provided on the control board of the handle device 10, and a bus interface is also provided on the control board of the main unit 20, thereby enabling bus communication between the main unit 20 and the handle device 10. It is understood that bus communication can reduce the complexity of wiring within the handle device 10. Optionally, wireless communication can also be used between the handle device 10 and the main unit 20, which can also reduce the complexity of wiring within the handle device 10. Understandably, a first drive circuit 241 is provided between the first motor 221 and the control unit 22 to generate a drive signal to drive the first motor 221 to rotate; a second drive circuit 242 is provided between the second motor 222 and the control unit 22 to generate a drive signal to drive the second motor 222 to rotate. Optionally, the circuit structures of the two drive circuits can be identical, specifically composed of multiple switching elements. Each gate terminal of the switching element is electrically connected to the control unit 22 to receive control signals from the control unit 22. Each drain or source terminal of the switching element is connected to the stator winding of the motor. The switching elements receive control signals from the control unit 22 and change their respective conduction states, thereby changing the current loaded by the battery pack on the stator winding of the motor.

[0039] It should be noted that the lawn mower 100 can start mowing when the handle device 10 is in the fully unfolded state and the fixed angle of the handle device 10 relative to the main machine 20 is approximately greater than 90°; and the lawn mower 100 can walk but cannot mow when the handle device 10 is in the non-fully unfolded state and the fixed angle of the handle device 10 relative to the main machine 20 is approximately greater than 90°. That is, before starting the lawn mower 100, the third switch 16 is closed to install the handle device 10 on the main machine 20 at an angle approximately greater than 90°, and then the lawn mower 100 is started as needed. For example, when mowing is started, the fourth switch 17 is opened to place the handle device 10 in the fully unfolded state, and then the first switch 14 and the second switch 15 are closed in sequence, so that the lawn mower 100 can perform mowing action. For example, if only the lawn mower 100 is moved without mowing, the fifth switch 18 can be closed to control the lawn mower 100 to walk. It can be understood that during the walking of the lawn mower 100, the walking speed of the lawn mower 100 can be controlled by controlling the speed regulating switch 19. In an embodiment, when the fifth switch 18 is closed and the speed regulating switch 19 is in a non-0 gear, the lawn mower 100 can walk. In addition, after the first switch 14 and the second switch 15 are closed to power on the main machine 20, the first switch 14 can be opened, and the first switch 14 can remain in the open state during the subsequent mowing or walking of the lawn mower 100.

[0040] In an embodiment, the control unit 22 can obtain the switch signals of the above-mentioned switches, and control the lawn mower 100 to mow and / or walk according to the conduction state of the switch signals and the sequence of switching the conduction state of different switches. It can be understood that the switch signal can directly reflect the closed or open state of the corresponding switch.

[0041] In a specific implementation, after the control unit 22 receives the first switch signal indicating that the first switch 14 is closed, the control unit 22 can monitor the second switch signal indicating the conduction state of the second switch 15 in real time, and when the second switch signal indicating that the second switch 15 is closed is obtained, the control unit 22 controls the first motor 221 to rotate to drive the cutting assembly 211 to cut vegetation. It should be noted that after the second switch 15 is closed and the first motor 221 rotates, the first switch 14 can be opened, and the rotation of the first motor 221 will not be affected, that is, the mowing will not be affected.

[0042] In an optional implementation, if the third switch 16 is arranged on the mower 100 to control the rotation angle of the handle device 10 on the main machine 20, the control unit 22, when receiving the first switch signal indicating that the first switch 14 is closed, needs to further acquire the third switch signal indicating that the third switch 16 is closed, and then monitor the second switch signal indicating the conduction state of the second switch 15 in real time or periodically, and control the first motor 221 to rotate to drive the cutting assembly 211 to cut the vegetation when the second switch signal indicating that the second switch 15 is closed is acquired. The third switch 16 can be closed before the first switch 14 is closed, or can be closed after the first switch 14 is closed, but the control unit 22 controls the mower 100 to mow according to the conduction state of the second switch 15 when the third switch 16 and the first switch 14 are both closed.

[0043] In an optional implementation, if the third switch 16 is arranged on the mower 100, and the fourth switch 17 is arranged to control the extension state of the handle device 100. The control unit 22, when receiving the first switch signal indicating that the first switch 14 is closed, needs to further acquire the third switch signal indicating that the third switch 16 is closed and the fourth switch signal indicating that the fourth switch 17 is disconnected, and then monitor the second switch signal indicating the conduction state of the second switch 15 in real time or periodically, and control the first motor 221 to rotate to drive the cutting assembly 211 to cut the vegetation when the second switch signal indicating that the second switch 15 is closed is acquired. The control sequence of the third switch 16 and the fourth switch 17 can not be limited, and the control sequence of the first switch 14, the third switch 16 and the fourth switch 17 can also not be limited. In this embodiment, the control unit 22 controls the mower 100 to mow according to the conduction state of the second switch 15 when the first switch 14 is closed, the third switch 16 is closed, and the fourth switch 17 is disconnected.

[0044] Further, the control unit 22 controls the first motor 221 to stop rotating to stop the mower 100 from mowing after detecting the third switch signal indicating that the third switch 16 is disconnected and / or the fourth switch signal indicating that the fourth switch 17 is closed. That is, when the handle device 10 is not in the fully extended state and / or the fixed angle of the handle device 10 relative to the main machine 20 is substantially in the range of greater than or equal to 0° and less than or equal to 90°, the mower 100 stops mowing to avoid danger.

[0045] In one embodiment, the power-on state of the second motor 222 in the mower 100 is controlled by the fifth switch 18. It can be understood that the user can mow only, walk only, or mow and walk at the same time.

[0046] Specifically, during the process that the mower 100 performs mowing, i.e. the process that the first motor 221 works, if the control unit 22 detects the fifth switch signal indicating that the fifth switch 18 is closed, the control unit 22 can control the second motor 222 to start working. That is, when the third switch 16 is closed, or the second switch 15 and the third switch 16 are both closed, or the first switch 14, the second switch 15 and the third switch 16 are all closed, or the first switch 14, the second switch 15, the third switch 16 and the fourth switch 17 are all closed, and the control unit 22 detects that the fifth switch 18 is closed, the control unit 22 can control the second motor 222 to rotate, so that the mower 100 moves. It can be understood that when the control unit 22 detects that the third switch 16 is opened and / or the fifth switch 18 is opened, the control unit 22 controls the second motor 222 to stop rotating, so that the mower 100 stops moving. It can be understood that if the third switch 16 is opened, the first motor 221 will also stop working, i.e. after the third switch 16 is opened, the mower 100 stops working.

[0047] In the embodiment, by adopting independent electronic switches to control the power-on state of the host and the safe start of the host respectively, the problems of unstable machine performance and reduced safety caused by the mechanical structure of the mechanical safety switch not rebounding and other reasons are avoided.

[0048] Reference Figure 4 , assuming that only the first switch 14, the second switch 15, the fifth switch 18 and the speed regulating switch 19 are provided on the mower, as an embodiment, the control method of the above mower specifically includes the following steps:

[0049] S101, acquiring a switch signal;

[0050] Specifically, the acquired switch signal not only includes the conduction state of different switches, but also can indicate the conduction sequence of the switches.

[0051] S102, detecting whether the first switch is conducted or not, if yes, turning to step S103, otherwise, continuing to detect.

[0052] S103, detecting whether the second switch is conducted or not, if yes, turning to step S104, otherwise, continuing to detect.

[0053] S104, controlling the first motor to start working.

[0054] S105, detecting whether the fifth switch is conducted or not, if yes, turning to step S106, otherwise, continuing to detect.

[0055] S106, controlling the second motor to start working.

[0056] S107, detecting whether the speed regulating switch is conducted or not, if yes, turning to step S108, otherwise, continuing to detect.

[0057] S108, adjusting the rotating speed of the second motor according to the sliding state of the speed regulating switch.

[0058] It should be noted that after the steps S104, S106 and S108 are executed, the step S109 is further executed.

[0059] S109, detecting whether the second switch and the fifth switch are both open, if yes, turning to the step S110, otherwise, continuing to turn to the steps S111 and S112.

[0060] S110, controlling the first motor and the second motor to stop rotating.

[0061] S111, the second switch is open.

[0062] S112, the fifth switch is open.

[0063] S113, controlling the first motor to stop rotating.

[0064] S114, controlling the second motor to stop rotating.

[0065] Reference Figure 5 , assuming that the lawn mower is provided with the first switch 14, the second switch 15, the third switch 16, the fourth switch 17, the fifth switch 18 and the speed regulating switch 19, as an embodiment, the control method of the above lawn mower specifically comprises the following steps:

[0066] S201, detecting whether the third switch is closed and the fourth switch is open, if yes, turning to the step S202, otherwise, continuing to detect.

[0067] S202, detecting whether the first switch is turned on, if yes, turning to the step S203, otherwise, continuing to detect.

[0068] S203, detecting whether the second switch is turned on, if yes, turning to the step S204, otherwise, continuing to detect.

[0069] S204, controlling the first motor to start working.

[0070] S205, detecting whether the fifth switch is turned on, if yes, turning to the step S206, otherwise, continuing to detect.

[0071] S206, controlling the second motor to start working.

[0072] S207, detecting whether the speed regulating switch is turned on, if yes, turning to the step S208, otherwise, continuing to detect.

[0073] S208, adjusting the rotating speed of the second motor according to the sliding state of the speed regulating switch.

[0074] It should be noted that after the first motor is started under the control of step S204, step S206 and step S208, the process can also turn to step S209.

[0075] S209, detecting whether the second switch and the fifth switch are both open and / or the third switch is open, if yes, turning to step S210, otherwise, turning to step S211 and step S212.

[0076] S210, controlling the first motor and the second motor to stop rotating.

[0077] S211, the second switch is open or the third switch is open.

[0078] S212, the fifth switch is open or the third switch is open.

[0079] S213, controlling the first motor to stop rotating.

[0080] It can be understood that when the fourth switch is closed, i.e. the connecting rod can freely extend and retract, the first motor also stops rotating.

[0081] S214, controlling the second motor to stop rotating.

[0082] It should be noted that the above are only preferred embodiments of the present application and the technical principles applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and those skilled in the art can make various obvious changes, re-adjustments and substitutions without departing from the scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. An electric power tool, comprising: a main body including a working assembly and a control unit; a motor configured to provide driving force for the working assembly; a first switch configured as a signal switch and configured to provide a safety start signal for the main body; a second switch configured to control a power-on state of the main body; characterized in that the control unit is configured to: obtain a first switch signal capable of indicating a switch state of the first switch and a second switch signal capable of indicating a switch state of the second switch; detect, after the first switch signal indicates that the first switch is in a closed state, that the second switch signal indicates that the second switch is in a closed state, and control the motor to start working; after the motor starts working, the first switch can be turned off without affecting the continuous working of the motor. 2.The electric power tool according to claim 1, further comprising: a handle device connected to the main body; a signal unit arranged on the handle device and configured to obtain the switch signals of the first switch and the second switch; a communication bus connected between the signal unit and the control unit and configured to transmit the switch signals on the signal unit to the control unit. 3.The electric power tool according to claim 2, wherein the working assembly includes a cutting assembly and a walking assembly; the motor includes: a first motor configured to provide driving force for the cutting assembly; a second motor configured to provide driving force for the walking assembly; the control unit is configured to: detect, after the first switch signal indicates that the first switch is in a closed state, that the second switch signal indicates that the second switch is in a closed state, and control the first motor to start working. 4.The electric power tool according to claim 3, further comprising: a third switch configured to control a rotation angle of the handle device on the main body; a fourth switch configured to control an extension state of the handle device; the control unit is configured to: obtain a third switch signal capable of indicating a switch state of the third switch and a fourth switch signal capable of indicating a switch state of the fourth switch; after the third switch is in a closed state and the fourth switch is in an open state, sequentially detect that the first switch is in a closed state and the second switch is in a closed state, and control the first motor to start working; when the third switch is in an open state and / or the fourth switch is in a closed state, control the first motor to stop rotating. 5.The electric power tool according to claim 4, further comprising: a fifth switch configured to control a power-on state of the second motor; the control unit is configured to: obtain a fifth switch signal capable of indicating a switch state of the fifth switch; when the third switch is closed and the fifth switch signal indicating that the fifth switch is closed is detected, control the second motor to start working. 6.The electric power tool according to claim 5, wherein the control unit is configured to: when the third switch is in an open state and / or the fifth switch is in an open state, control the second motor to stop rotating. 7.A garden tool, comprising: ​ ​ A host comprising a working assembly and a control unit; A motor for providing driving force for the working assembly; A handle device connected to the host; A first switch provided on the handle device, which is a signal switch for providing a safe starting signal of the host; A second switch provided on the handle device for controlling the power-on state of the host; characterized in that the control unit is configured to: obtain a first switch signal capable of indicating the switch state of the first switch and a second switch signal capable of indicating the switch state of the second switch; detect, after the first switch signal indicates that the first switch is in a closed state, that the second switch signal indicates that the second switch is in a closed state, control the motor to start working, and after the motor starts working, the first switch can be disconnected without affecting the continuous working of the motor.

8. A mower comprising: a host; a cutting assembly for cutting vegetation; a walking assembly comprising a first walking wheel and a second walking wheel; a first motor for controlling the cutting assembly to perform a cutting action; a second motor for controlling the walking assembly to walk; a handle device connected to the host; a first switch provided on the handle device, which is a signal switch for providing a safe starting signal of the host; a second switch provided on the handle device for controlling the power-on state of the host; a control unit provided on the host; the control unit is configured to: obtain a first switch signal capable of indicating the switch state of the first switch and a second switch signal capable of indicating the switch state of the second switch; detect, after the first switch signal indicates that the first switch is in a closed state, that the second switch signal indicates that the second switch is in a closed state, control the first motor to start working, and after the motor starts working, the first switch can be disconnected without affecting the continuous working of the motor.

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