Power tool speed regulation system and method

Abstract

The present invention discloses a power tool speed control system, wherein a power module is connected to an inverter, which is electrically connected to a controller and a motor, and the controller is electrically connected to a switch speed control module, a speed display module, and a speed prompt module. The switch speed control module includes a switch trigger electrically connected to the controller and sets the target operating speed of the motor according to the amount of travel of the switch trigger. The speed display module is used to display the preset operating speed of the motor. The speed prompt module is used to prompt the set state of the target operating speed. The present invention adds an intelligent speed control mode to the power tool. The target operating speed is set by cooperating with the switch speed control module, the speed display module, and the speed prompt module. This is convenient and quick, and can meet the actual demand for the power tool to rotate within a specific time and at a specific operating speed. There is no need to continuously press the switch trigger, which greatly reduces the operator's labor intensity and improves work efficiency.

Description

Technical field

[0001] The present invention relates to the field of electric tool control, and in particular to an electric tool speed regulation system and method. [Background Technology]

[0002] Currently, for power tools with a switch trigger with a speed regulation function, as the switch trigger is pressed for a longer distance, the motor speed increases accordingly; conversely, as the switch trigger is pressed for a shorter distance, the motor speed decreases accordingly.

[0003] However, when operating a power tool through the above-mentioned speed regulation scheme, the operating speed of its motor is limited by the on-stroke amount of the switch trigger: when the operator wants to use the power tool within a specific time and at a specific operating speed of the motor, the operator must manually press the switch trigger and keep the on-stroke amount of the switch trigger unchanged. Such operation makes it difficult to keep the motor rotating at a specific operating speed. Especially for operators who use power tools continuously for a long time, it is easy to cause physical fatigue, energy collapse, and greatly reduce work efficiency, which in turn leads to delays in normal work, while greatly reducing the operator's comfort.

[0004] Therefore, it is necessary to design a power tool speed regulation system and method to solve the above technical problems. [Summary of the invention]

[0005] In view of the shortcomings of the prior art, the present invention aims to provide a power tool speed control system and method, which adopts the following technical solutions:

[0006] A power tool speed control system includes a power module, a motor, a controller and an inverter, wherein the power module is connected to the inverter, and the inverter is connected to the motor and the controller; the controller is connected to a switch constant speed module, a speed display module and a speed constant prompt module; the switch constant speed module includes at least a switch trigger connected to the controller, and sets the target operating speed of the motor according to the connection stroke of the switch trigger; the speed display module is used to display the preset operating speed of the motor; the speed constant prompt module is used to prompt the setting status of the target operating speed; after the target operating speed is set, the power tool runs at the target operating speed when it is restarted.

[0007] Furthermore, the rotation speed display module includes at least a display connected to the controller, and presents the preset operating speed through the display.

[0008] Furthermore, the speed control prompt module adopts at least one of an indicator light module and a voice prompt module.

[0009] Furthermore, the indicator light module includes at least an LED light, and the setting status of the target running speed is displayed through the LED light; the voice prompt module includes at least a voice player, and the setting status of the target running speed is prompted through the voice player.

[0010] Furthermore, the setting state of the target running speed includes at least a setting state and a setting completed state.

[0011] Preferably, the switch trigger is a variable resistance switch.

[0012] Furthermore, the controller at least includes a calculation module, a storage unit connected to the calculation module, and a timing unit, wherein the storage unit stores the preset operating speed corresponding to the on-stroke amount of the switch trigger and a duration threshold for pressing the switch trigger and keeping the on-stroke amount of the switch trigger unchanged; the calculation module is used to calculate the on-stroke amount of the switch trigger and compare it with the preset operating speed to obtain the target operating speed; the timing unit is used to count the duration for pressing the switch trigger and keeping the on-stroke amount of the switch trigger unchanged.

[0013] Furthermore, the calculation module is further configured to compare the duration with the duration threshold to control the setting state of the target running speed.

[0014] Furthermore, the controller is connected to a mode switching module for controlling the working mode of the motor; the working mode includes at least a normal mode and an intelligent constant speed mode, the normal mode is used to control the real-time operating speed of the motor according to the connection stroke of the switch trigger; the intelligent constant speed mode is used to set the target operating speed according to the switch constant speed module, the speed display module and the constant speed prompt module.

[0015] Furthermore, the mode switching module includes at least a mode button, and controls the motor to switch between the normal mode and the intelligent constant speed mode through the mode button.

[0016] The present invention provides a method for regulating the speed of an electric tool, comprising the following steps:

[0017] S1: The power tool is powered on and enters normal mode;

[0018] S2: Switch the normal mode to the intelligent constant speed mode by pressing the control mode button. In this mode, the switch trigger is pressed continuously to adjust the amount of travel and the preset running speed displayed on the display is monitored until the preset running speed reaches the target running speed.

[0019] S3: In intelligent speed control mode, when the preset running speed is equal to the target running speed and the duration is less than the duration threshold, the LED light will flash continuously or the voice player will issue a prompt indicating that the target running speed is being set;

[0020] S4: When the preset running speed is equal to the target running speed and the duration is greater than or equal to the duration threshold, the LED light is always on or the voice player announces that the target running speed is in the set state, and then the switch trigger is released;

[0021] S5: Press the switch trigger again and release it, and the power tool will run at the target speed.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The present invention adds an intelligent constant speed mode to the power tool. The target operating speed is set by cooperating with the switch constant speed module, the speed display module and the constant speed prompt module. This is convenient and quick, and can meet the operator's actual needs for the power tool to rotate at a specific operating speed within a specific time. Especially for operators who use the power tool continuously for a long time, there is no need to press the switch trigger for a long time, which frees the operator's fingers, reduces labor intensity, makes the operator less likely to get tired, greatly improves work efficiency, and at the same time greatly improves the operator's comfort.

[0024] In addition, the present invention changes the traditional single method of normal mode speed regulation, and enables the power tool to switch between normal mode and intelligent constant speed mode through the mode button. The dual-mode operation can meet the different usage needs of customers and has high flexibility.

Brief Description of the Drawings

[0025] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings:

[0026] Figure 1 It is a module structure diagram of the electric tool speed control system of the present invention;

[0027] Figure 2 This is a principle circuit diagram of the electric tool speed regulation system of the present invention;

[0028] Figure 3 This is a principle flow chart of the electric tool speed regulation method of the present invention;

[0029] Figure 4 2 is an application example diagram of the present invention.

[0030] The meaning of the reference numerals in the figures:

[0031] 1. Power module 2. Motor 3. Controller 4. Inverter 5. Switch speed module 6. Speed ​​display module 7. Speed ​​prompt module 8. Mode switching module 31. Calculation module 32. Storage unit 33. Timing unit 51. Switch trigger 61. Display 71. Indicator module 72. Voice prompt module 81. Mode button 711. LED light 721. Voice player [Specific implementation method]

[0032] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0033] See Figure 1 、 Figure 2 The power tool speed control system shown includes a power module 1, a motor 2, a controller 3 and an inverter 4. The power module 1 is connected to the inverter 4, and the inverter 4 is connected to the motor 2 and the controller 3; the controller 3 is connected to the switch speed control module 5, the speed display module 6 and the speed control prompt module 7; the switch speed control module 5 includes at least a switch trigger 51 connected to the controller 3, and sets the target operating speed of the motor 2 according to the connection stroke of the switch trigger 51; the speed display module 6 is used to display the preset operating speed of the motor 2; the speed control prompt module 7 is used to prompt the setting status of the target operating speed; after the target operating speed is set, the power tool runs at the target operating speed when it is restarted; wherein, the switch trigger 51 is used at least to control the start and stop of the motor 2, and the controller 3 adopts an MCU controller.

[0034] See Figure 2 As shown, the speed display module 6 includes at least a display 61 connected to the controller 3, and the preset running speed is presented through the display 61; the constant speed prompt module 7 adopts at least one of an indicator light module 71 and a voice prompt module 72; the indicator light module 71 includes at least an LED light 711, and the setting status of the target running speed is displayed through the LED light 711; the voice prompt module 72 includes at least a voice player 721, and the setting status of the target running speed is prompted through the voice player 721.

[0035] In this embodiment, the setting state of the target running speed includes at least a setting state and a setting completed state.

[0036] In this embodiment, the switch trigger 51 adopts a variable resistance switch, and preferably, a VR speed regulating switch is adopted.

[0037] Continue reading Figure 1 、 Figure 2As shown, the controller 3 at least includes a calculation module 31, a storage unit 32 connected to the calculation module 31, and a timing unit 33. The storage unit 32 stores a preset operating speed corresponding to the on-stroke amount of the switch trigger 51 and a duration threshold for pressing the switch trigger 51 and keeping the on-stroke amount of the switch trigger 51 unchanged; the calculation module 31 is used to calculate the on-stroke amount of the switch trigger 51 and compare it with the preset operating speed to obtain a target operating speed; the timing unit 33 is used to count the duration of pressing the switch trigger 51 and keeping the on-stroke amount of the switch trigger 51 unchanged.

[0038] In this embodiment, the operation module 31 is further used to compare the duration with a duration threshold to control the setting state of the target running speed, wherein the duration threshold is 1s-2s, preferably 2s.

[0039] Continue reading Figure 1 、 Figure 2 As shown, the controller 3 is connected to a mode switching module 8 for controlling the working mode of the motor; the working mode includes at least a normal mode and an intelligent constant speed mode, the normal mode is used to control the real-time running speed of the motor 2 according to the connection stroke of the switch trigger 51; the intelligent constant speed mode is used to set the target running speed according to the switch constant speed module 5, the speed display module 6 and the constant speed prompt module 7; the mode switching module 8 includes at least a mode button 81, and the mode button 81 is used to control the motor 2 to switch between the normal mode and the intelligent constant speed mode.

[0040] See Figure 3 As shown, the present invention provides a power tool speed regulation method, which is based on a power tool speed regulation system and includes the following steps:

[0041] S1: The power tool is powered on and enters the normal mode. In this mode, the real-time operating speed is controlled by pressing the switch trigger 51 to a certain extent. The normal mode is the initial default mode when the power tool is powered on.

[0042] S2: Switching the normal mode to the intelligent constant speed mode by pressing the mode button 81. In this mode, the amount of travel of the switch trigger 51 is continuously adjusted while monitoring the preset running speed displayed on the display 61 until the preset running speed reaches the target running speed.

[0043] S3: In the intelligent constant speed mode, when the preset running speed is equal to the target running speed and the duration is less than the duration threshold, the LED light 711 flashes continuously or the voice player 721 issues a prompt indicating that the target running speed is being set;

[0044] S4: When the preset operating speed is equal to the target operating speed and the duration is greater than or equal to the duration threshold, the LED light 711 is constantly on or the voice player 721 issues a prompt indicating that the target operating speed has been set, and then the switch trigger 51 is released. During the target operating speed setting process, the power tool is in a stopped state.

[0045] S5: Press the switch trigger 51 again and then release it, and the power tool runs at the target speed;

[0046] S6: Press the switch trigger 51 again and then release it, and the power tool stops;

[0047] S7: Press the Mode 81 button again to switch the intelligent cruise control mode to normal mode.

[0048] When the preset running speed is not equal to the target running speed, the LED light 711 is in a continuous flashing state or the voice player 721 issues a prompt indicating that the target running speed is in the setting state.

[0049] In this embodiment, the setting status of the target running speed can also be displayed on the display 61, such as the display 61 showing a setting status or a setting completed status.

[0050] In this embodiment, when the power tool is in the intelligent constant speed mode and needs to be changed to another target operating speed, the following two schemes can be used: (1) first press the mode button 81 to switch the intelligent constant speed mode to the normal mode; press the mode button 81 again to switch the normal mode to the intelligent constant speed mode, and then set another target operating speed; (2) stop the power tool, press the switch trigger 51 and keep the switch trigger 51 pressed for 2s to 3s to directly enter the target operating speed setting state, and then reset another target operating speed according to step S3.

[0051] The speed regulation working principle of the present invention is:

[0052] (1) Normal mode: The operator adjusts the on-stroke amount of the switch trigger 51 in real time according to the operating speed requirement of the power tool, thereby achieving the purpose of adjusting the real-time operating speed of the power tool;

[0053] (2) Intelligent constant speed mode (assuming the target running speed is V0, the preset running speed is V1, the duration threshold is T0, and the duration is T1): V1 is adjusted by continuously adjusting the amount of stroke of pressing the switch trigger 51 until V1 is equal to V0. During this speed adjustment process, the LED light 711 is in a continuous flashing state or the voice player 721 issues a prompt that V0 is in the setting state; when V1 is equal to V0 and T1 is less than T0, the LED light 711 is in a continuous flashing state or the voice player 721 issues a prompt that the target running speed is in the setting state; when V1 is equal to V0 and T1 is greater than or equal to T0, the LED light 711 is always on or the voice player 721 issues a prompt that V0 is in the setting state, and then the switch trigger 51 is released, and V0 is set.

[0054] The present invention adds an intelligent constant speed mode to the power tool, and sets the target operating speed through the cooperation of the switch constant speed module 5, the speed display module 6 and the constant speed prompt module 7. This is convenient and fast, and can meet the operator's actual needs for the power tool to rotate within a specific time and at a specific operating speed. Especially for operators who use the power tool continuously for a long time, there is no need to press the switch trigger 51 for a long time, which frees the operator's fingers, reduces labor intensity, makes the operator less likely to get tired, greatly improves work efficiency, and at the same time greatly improves the operator's comfort. In addition, the present invention changes the traditional single method of ordinary mode speed regulation, and uses the mode button 81 to switch the power tool between ordinary mode and intelligent constant speed mode. The dual-mode operation can meet the different usage needs of customers and has high flexibility.

[0055] The present invention is applicable to electric tools such as electric drills and impact screwdrivers. Figure 4 The electric drill shown.

[0056] The present invention is not limited to the above-mentioned specific embodiments. Those skilled in the art can easily understand that there are many other alternatives to the electric tool speed control system and method of the present invention without departing from the principle and scope of the present invention. The scope of protection of the present invention shall be based on the content of the claims.

Claims

1. A power tool speed control system, comprising a power module, a motor, a controller, and an inverter, wherein the power module is connected to the inverter, and the inverter is connected to the motor and the controller; characterized in that: The controller is connected to the switch constant speed module, the speed display module and the constant speed prompt module; The switch speed control module at least includes a switch trigger connected to the controller, and sets the target operating speed of the motor according to the switch trigger's on stroke. The speed display module is used to display the preset running speed of the motor to facilitate setting the target running speed; The constant speed prompt module is used to prompt the setting state of the target running speed; After the target operating speed is set, the electric tool runs at the target operating speed when it is restarted; The step of setting the target operating speed of the motor according to the on-stroke amount of the switch trigger includes: Obtaining a duration during which the on-stroke amount of the switch trigger remains unchanged; According to the on-stroke amount of the switch trigger, a preset operating speed is obtained, and there is a mapping relationship between the on-stroke amount of the switch trigger and the preset operating speed; A target operating speed of the motor is set according to the duration and the preset operating speed.

2. The electric tool speed control system according to claim 1, characterized in that: The rotation speed display module at least includes a display connected to the controller, and displays the preset operating speed through the display.

3. The electric tool speed control system according to claim 1, wherein: The speed-regulating prompt module adopts at least one of an indicator light module and a voice prompt module.

4. The electric tool speed control system according to claim 3, characterized in that: The indicator light module includes at least an LED light, and displays the setting state of the target running speed through the LED light; The voice prompt module at least includes a voice player, and prompts the setting status of the target running speed through the voice player.

5. The electric tool speed control system according to claim 1, characterized in that: The setting state of the target running speed includes at least a setting state and a setting completed state.

6. The electric tool speed control system according to claim 1, characterized in that: The switch trigger adopts a variable resistance switch.

7. The electric tool speed control system according to claim 1, characterized in that: The controller includes at least a calculation module, a storage unit connected to the calculation module, and a timing unit, wherein the storage unit stores the preset operating speed corresponding to the on-stroke amount of the switch trigger and a duration threshold for pressing the switch trigger and maintaining the on-stroke amount of the switch trigger unchanged; The calculation module is used to calculate the on-stroke amount of the switch trigger and compare it with the preset operating speed to obtain the target operating speed; The timing unit is used to count the duration of pressing the switch trigger and keeping the switch trigger's on stroke unchanged; The calculation module is further configured to compare the duration with a duration threshold to control a setting state of the target running speed.

8. The electric tool speed control system according to claim 1, characterized in that: The controller is connected to a mode switching module for controlling the working mode of the motor; the working mode includes at least a normal mode and an intelligent constant speed mode, the normal mode is used to control the real-time operating speed of the motor according to the connection stroke of the switch trigger; the intelligent constant speed mode is used to set the target operating speed according to the switch constant speed module, the speed display module and the constant speed prompt module.

9. The electric tool speed control system according to claim 8, characterized in that: The mode switching module includes at least a mode button, and controls the motor to switch between the normal mode and the intelligent constant speed mode through the mode button.

10. A method for regulating the speed of an electric tool, characterized in that: The following steps are involved: S1: The power tool is powered on and enters normal mode; S2: Switch the normal mode to the intelligent constant speed mode by pressing the control mode button. Continuously adjust the amount of time the switch trigger is pressed and monitor the preset running speed displayed on the display until the preset running speed reaches the target running speed. S3: In intelligent speed control mode, when the preset running speed is equal to the target running speed and the duration is less than the duration threshold, the LED light will flash continuously or the voice player will issue a prompt indicating that the target running speed is being set; S4: When the preset running speed is equal to the target running speed and the duration is greater than or equal to the duration threshold, the LED light is always on or the voice player announces that the target running speed is in the set state, and then the switch trigger is released; S5: Press the switch trigger again and release it, and the power tool will run at the target speed.

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