CN116587369A - Bench type tool and control method thereof - Google Patents

Abstract

The present application provides a bench tool comprising: a workbench, wherein the workbench is provided with a working plane for placing a workpiece; a saw blade acting on a workpiece; a motor for driving the saw blade to rotate; a controller for controlling rotation of the motor; the sensing device is electrically connected with the controller and is used for sensing the state of the workpiece and outputting a first signal to the first switch of the controller so that a user can select at least two working modes of the bench tool; when the stage tool is in the first mode of operation, the controller is configured to: and adjusting the rotating speed of the motor to be the first rotating speed based on the acquired first signal or the working parameter of the motor. By adopting the technical scheme, the table-type tool which is applicable to various working conditions and has high safety can be provided.

Description

Bench type tool and control method thereof

Technical Field

The present application relates to an electric tool, and more particularly, to a control method of a table-type tool.

Background

Bench tools, which are commonly used for cutting and grinding operations, and some large power tools are one of the tools that are widely used at present. Taking cutting as an example, a table-type tool typically includes a table and a saw blade disposed on the table for cutting materials including wood, plastic, metal, and the like. When a user performs a cutting operation on a small workpiece, a switch on the table is typically operated with one hand to turn off the motor when the cut is completed. However, in some specific cases. For example, when a workpiece to be processed is relatively large, a user cannot take out hands in time to shut down after cutting, so that electric energy waste is caused, meanwhile, potential safety hazards are brought, and user experience is poor.

Disclosure of Invention

In order to overcome the defects of the related art, the application provides a control method suitable for a bench tool, which can provide a bench tool with various working modes and can automatically identify shutdown after workpiece withdrawal.

In order to achieve the above object, the present application adopts the following technical scheme:

a bench-type tool comprising: a workbench provided with a working plane for placing a workpiece; a saw blade acting on a workpiece; a motor for driving the saw blade to rotate; a controller for controlling rotation of the motor; the sensing device is electrically connected with the controller and is used for sensing the state of the workpiece and outputting a first signal to the controller; a first switch for a user to select at least two modes of operation of the bench tool; when the stage tool is in the first mode of operation, the controller is configured to: and adjusting the rotating speed of the motor to be the first rotating speed based on the acquired first signal or the working parameter of the motor.

In some embodiments, the bench tool further comprises a second switch operable by a user, the second switch being configured as an electromagnetic switch; the second switch includes a start switch and an off switch for user operation.

In some embodiments, when the stage tool is in the first mode of operation or the second mode of operation, the controller is configured to: when the trigger signal of the starting switch is obtained, a control signal is output to the driving circuit to drive the motor to rotate.

In some embodiments, when the stage tool is in the second mode of operation, the controller is configured to: the motor is controlled to be turned off when a trigger signal for turning off the switch is acquired.

In some embodiments, the sensing device includes at least one sensor disposed on a front side of the saw blade; the distance between the sensor and the saw blade is more than 0 and less than or equal to 10mm.

In some embodiments, the sensor comprises a capacitive proximity switch, an inductive proximity switch, or an optoelectronic switch.

In some embodiments, the operating parameter of the motor includes an operating current or rotational speed of the motor.

In some embodiments, the first rotational speed is set to 0.

In some embodiments, the stage tool further comprises a power source device removably mounted to the stage tool for providing power to the stage tool.

A control method of a stage-type tool, the stage-type tool comprising: a workbench provided with a working plane for placing a workpiece; a saw blade acting on a workpiece; a motor for driving the saw blade to rotate; a first switch for a user to select at least two modes of operation of the bench tool; a sensing device for sensing a state of the workpiece; a controller electrically connected to at least the sensing device; the control method comprises the following steps: and acquiring the working mode of the bench tool, and when the bench tool is in the first working mode, after acquiring the preset time of the load removal signal of the workpiece, regulating the rotating speed of the motor to be the first rotating speed by the controller.

In some embodiments, the load shedding signal is related to a first signal output by the sensing device or an operating parameter of the motor.

In some embodiments, the operating parameters of the motor include at least an operating current or a rotational speed of the motor.

In some embodiments, the preset time is greater than or equal to 400ms and less than or equal to 600ms.

The application has the advantages that: the user can independently set up different working modes through the switch that sets up on the workstation according to different cutting demands in order to satisfy the different demands of user when cutting large-scale work piece and small-size work piece. On the basis, the automatic shutdown function after intelligently identifying the machined parts to evacuate is provided, the endurance of the battery pack is improved, the potential safety hazard is reduced, and the user experience is improved.

Drawings

FIG. 1 is a perspective view of a table tool as a specific embodiment;

FIG. 2 is an electrical schematic of the bench-type tool of FIG. 1;

FIG. 3a is a schematic illustration of a position of the sensing device on the table tool of FIG. 1;

FIG. 3b is another schematic view of the position of the sensing device in the table tool of FIG. 1;

FIG. 4 is a flow chart of a method of controlling the table tool of FIG. 1 in a smart mode;

FIG. 5 is a flow chart of a method of controlling the table tool of FIG. 1 in a normal mode;

FIG. 6 is a perspective view of a table-type tool as another embodiment;

FIG. 7 is an electrical schematic of a bench-type tool as another embodiment;

FIG. 8 is a schematic view of the location of a sensing device on the table tool of FIG. 6;

FIG. 9 is a control circuit diagram of a second switch of the table tool of FIG. 6;

FIG. 10 is a flow chart of a control scheme of the bench tool of FIG. 6 in a smart mode and a normal mode;

FIG. 11 is a schematic view of the stage tool of FIG. 6 in an empty stage, a loading stage, and a load-removing stage;

fig. 12 is a flow chart of a control scheme of the bench-type tool in fig. 6 in a smart mode.

Detailed Description

The application is described in detail below with reference to the drawings and the specific embodiments.

Fig. 1 shows a table-type tool 100 as an embodiment in the present application. The bench tool 100 may be any of a variety of known types, such as a stand alone bench tool or a portable bench tool. The bench-type tool 100 in fig. 1 is designed to be movable.

Referring to fig. 1 to 4, the stage tool 100 includes a stage 10, and the stage 10 has a work plane 11 on which a workpiece can be placed. Specifically, the work plane 11 is the upper surface of the work table 10 for a user to perform a cutting operation thereon. The work plane 11 is formed with a through hole 12. The bench tool 100 further includes a saw blade 20 for cutting a workpiece. Saw blade 20 extends through bore 12. The table-type tool 100 further includes a motor 30 for providing power, and the saw blade 20 is rotated by the motor 30 disposed below the work plane 11 to perform a cutting function. The saw blade 20 is used to cut a workpiece 40, such as wood, that is pushed along the work plane 11 and in contact with the saw blade 20.

The stage tool 100 further includes a driving module 80 for driving the motor 30 and a controller 70 electrically connected to the driving module 80. The controller 70 outputs a control signal to the driving circuit 80 to control the operation of the motor 30. Specifically, the driving module 80 distributes voltages to the motor 30 in a certain logic relationship under the driving of the control signal output from the controller 70, so that the motor 30 is started and generates continuous torque. In some embodiments, the drive module 80 includes a plurality of electronic switches. Specifically, the electronic switch includes a field effect transistor or an insulated gate bipolar transistor, or the like. In some embodiments, the drive module 80 is a three-phase bridge circuit. The motor 30 in this embodiment is preferably provided as a brushless motor, although other types of motors may be used, and the application is not limited thereto. In some embodiments, the controller 70 employs a dedicated control chip (e.g., MCU, micro control unit, microcontroller Unit).

In some embodiments, the bench tool 100 further comprises a sensing device 60. The sensing device 60 is electrically connected to the controller 70, and is configured to sense a state of the workpiece and output a first signal to the controller 70. Specifically, the sensing device 60 includes at least one sensor for identifying the condition of the workpiece 40. Specifically, the sensing device 60 may employ a mechanical switch, a signal switch, a capacitive sensor, or a photoelectric switch, etc. In this embodiment, the sensing device 60 is configured as a capacitive proximity switch.

Referring to fig. 3a, a sensing device 60 is at least partially located on the work plane 11 for sensing a processing state of the workpiece 40 to obtain a load rejection signal of the workpiece 40. The saw blade 20 is formed with a cutting plane (not shown) and the projection of the sensing device 60 onto the plane of the cutting plane does not overlap with the projection of the saw blade 20 onto the plane of the cutting plane. The arrow direction in fig. 3a is the direction of movement of the workpiece 40. The user moves the work piece 40 in the direction of the arrow to perform a cutting operation, and the sensing device 60 is capable of sensing evacuation of the work piece 40 when the cutting operation is completed or the user moves the work piece 40 out of the work plane 11. The load shedding signal in this embodiment is related to the first signal output by the sensing device 60. The load removal signal in this embodiment may be understood as the end of the processing of the workpiece, or may be understood as the withdrawal of the workpiece from the work plane. Of course, those skilled in the art can also define the load rejection signal for other reasons, such as stopping the workpiece for a period of time.

When the user manipulates the workpiece 40 and moves it gradually toward the capacitive proximity switch in the direction of the arrow in fig. 3a, the capacitive dielectric constant of the capacitive proximity switch changes, and the capacitance of the capacitive proximity switch changes accordingly due to the change in dielectric constant. The controller 70 is electrically connected to the capacitive proximity switch and obtains an electrical signal related to the capacitance of the capacitive proximity switch. When the user has completed the cutting operation, the workpiece 40 will no longer be moved in the direction of the arrow in fig. 3 a. When the user withdraws the workpiece 40 from the working plane 11, the capacitive dielectric constant of the capacitive proximity switch is restored to the original state, the sensing device 60 outputs a first signal, and the controller 70 adjusts the rotation speed of the motor 30 to be the first rotation speed after receiving the first signal. Specifically, the first rotation speed in the present embodiment is 0. Of course, the first rotational speed may also be set to a lower rotational speed.

Referring to fig. 3b, a sensing device 60a is at least partially positioned on the work plane 11 for sensing a processing state of the workpiece 40 to obtain a load rejection signal of the workpiece 40. The saw blade 20 is formed with a cutting plane (not shown) and the projection of the sensing device 60a onto the plane of the cutting plane is located within the projection of the saw blade 20 onto the plane of the cutting plane. Specifically, the projection of the sensing device 60a on the work plane 11 is located between the point a and the point B in the front-rear direction. Where point a is the rear end point of the projection of blade 20 onto work plane 11 and point B is the midpoint of the projection of blade 20 onto work plane 11. The arrow direction in fig. 3b is the direction of movement of the workpiece 40. When the user moves the workpiece 40 in the arrow direction to perform the cutting operation, and when the user moves the workpiece 40 out of the work plane 11 after the cutting operation is completed, the sensing device 60a can sense the load removal signal of the workpiece 40. Of course, in some embodiments, the load removal signal of the workpiece may also be determined by the user by acquiring parameters of the motor, such as current, voltage, or rotational speed.

In some embodiments, the table-type tool 100 further includes an operation switch 50 provided on the table 10, the operation switch 50 being operable by a user. Specifically, the operation switch 50 includes a first switch 51 and a second switch 52. The first switch 51 is a main control switch of the table tool 100, and the second switch 52 is a motor switch of the table tool 100. The user can put the stage tool 100 in different operation modes by operating the first switch 51. Specifically, when the user operates the first switch 51 in the "1" gear, the stage tool 100 is in the first operation mode, i.e., the smart mode. When the user operates the first switch in the "2" gear, the bench tool 100 is in the second operation mode, i.e., the normal mode. When the user operates the first switch 51 in the "0" gear, the stage tool 100 is in the shutdown mode. Of course, the above-described setting of the number of operation modes and specific correspondence are not limitations of the present application.

Next, a detailed description will be given of a control method in which the stage tool 100 is in different operation modes.

When the user operates the first switch 51 to be in the "1" gear, the table-type tool 100 is in the smart mode, and the motor 30 is not operated, and the saw blade 20 is not rotated. When the user turns on the second switch 52, the motor 30 begins to drive the saw blade 20 to rotate for the user to perform a cutting operation. The controller 70 senses the workpiece 40 through the sensing device 60, and when the sensing device 60 senses that the user completes the cutting operation of the workpiece 40, the controller 70 controls the motor 30 to be turned off to stop the saw blade 20 from continuing to rotate. When the user needs to start the motor 30 again to perform the cutting operation while the table tool 100 is still in the smart mode, the second switch 51 needs to be started again to control the start of the motor 30. Of course, it should be noted that, when the bench tool 100 is in the intelligent mode, the user may also control the first switch 51 to be in the "0" gear to achieve the shutdown.

The flow of the control method of the bench tool 100 in the smart mode will be described with reference to fig. 4, which includes the steps of:

s11: the controller acquires a signal that the first switch is in a 1 gear, and the console tool enters an intelligent mode;

s12: judging whether the second switch is turned on, if so, executing step S13; if not, repeating the step S12;

s13: the controller controls the motor to start, and the saw blade rotates to enable a user to execute cutting operation;

s14: judging whether the first switch is in a 0 gear or not, if so, executing a step S16; if not, executing step S15;

s15: whether the sensing device detects a workpiece load removal signal or not, if so, executing step S16; if not, returning to the step S14;

s16: the controller controls the motor to be turned off.

When the user sets the bench tool in the intelligent mode through the first switch, the user needs to continuously turn on the second switch, and Ma Dacai can be started to drive the saw blade to rotate so as to meet the cutting requirement of the user. When the user finishes cutting, the sensing device arranged on the workbench detects a workpiece load removing signal, and the controller controls the motor to be turned off. When the user needs to perform the cutting operation again, the second switch needs to be turned on again. Of course, when the table tool is in the intelligent mode, the user can also turn off the motor through the first switch, and only the first switch needs to be set at the '0' gear.

In other embodiments, when the user sets the table tool in the smart mode via the first switch, the user needs to continue to turn on the second switch Ma Dacai, which can be activated to rotate the saw blade to meet the user's cutting needs. The difference from the above embodiment is that, after the user finishes cutting, the controller controls the motor to be turned off after a preset time after the sensing device mounted on the workbench detects the workpiece load removal signal. Of course, the preset time can be designed by the person skilled in the art according to the actual situation. In this embodiment, the preset time is set to be less than or equal to 1 second. When the user needs to perform the cutting operation again, the second switch needs to be turned on again. Of course, when the table tool is in the intelligent mode, the user can also turn off the motor through the first switch, and only the first switch needs to be set at the '0' gear.

When the user operates the first switch 51 to be in the "2" gear, the table type tool 100 is in the normal mode, in which the motor 30 is normally started to drive the saw blade 20 to rotate, and in which the user can directly perform the cutting work. When the first switch 51 is in the "2" gear, the second switch 52 is in the "disabled state". The above-mentioned "failure state" is understood that the controller 70 does not process the on and off signals of the second switch 52 and the output signal of the sensing device 60 accordingly. When the user has completed the cutting operation, the motor 30 is operating normally and the saw blade 20 rotates normally, at which point the user may choose to continue the cutting operation or operate the first switch 51 in the "0" gear to turn off the motor 30.

The flow of the control method of the stage tool 100 in the normal mode will be described below with reference to fig. 5, which includes the steps of:

s21: the controller acquires a signal that the first switch is in a 2 gear, and the console tool enters a conventional mode;

s22: the controller controls the motor to start, and the saw blade rotates to enable a user to execute cutting operation;

s23: judging whether the first switch is in a 0 gear or not, if so, executing a step S24; if not, repeating the step S23;

s24: the controller controls the motor to be turned off.

The bench tool of the present application is provided with two modes of operation, a conventional mode and an intelligent mode, respectively. It will be appreciated that the normal mode operation is relatively simple, setting the first switch to "2" enables the motor to be started, performs the cutting operation, and turns the motor off by setting the first switch to "0" when the cutting is completed. This mode is suitable for a user to cut a small-sized workpiece, and both hands can operate the first switch relatively easily after the operation is completed. And requires a continuous cutting operation in a short time. In the intelligent mode, when the user needs to switch the first switch to the 1 gear, the second switch is triggered again to start the motor to execute the cutting operation, and the intelligent mode is beneficial in that the controller is powered off or powered off immediately after detecting the preset time after the workpiece load removing signal through the sensing device. The mode is suitable for the use under the working condition that the user is inconvenient to shut down manually after cutting a large-sized workpiece.

Fig. 6 to 8 show a stage-type tool 100b as another embodiment of the present application. The bench tool 100b may be any of a variety of known types, such as a stand alone bench tool or a portable bench tool. The stage tool 100b in fig. 6 is designed to be movable.

In the present embodiment, the stage tool 100b includes a driving module 80b electrically connected to the motor 30, a controller 70b, a sensing device 60b, a current detecting unit 31 for obtaining a motor current, and a rotation speed detecting unit 32 for obtaining a motor rotation speed. Wherein the current detecting unit 31 and the rotation speed detecting unit 32 are electrically connected to the controller 70b.

In some embodiments, the sensing device 60b is mounted on the front side of the saw blade. The sensing device 60b is electrically connected to the controller 70b, and is configured to sense a state of the workpiece and output a first signal to the controller 70b. Specifically, the distance between the sensing device 60b and the saw blade is greater than 0 and less than or equal to 20mm. The sensing device 60b includes at least one sensor that outputs a first signal for indicating a condition of the workpiece. The condition of the workpiece includes the workpiece being near the saw blade or being far from the saw blade. Specifically, the sensor is provided as a capacitive proximity switch of the direct current, NPN or NO type. In other embodiments, the first signal output by the sensor is used to indicate a state of the workpiece, including the workpiece 40 being above the sensor and the workpiece 40 not being above the sensor. In the present application, the type of the sensor is not limited, and for example, an inductive proximity switch or an optoelectronic switch may be used.

The stage-type tool 100b of the present embodiment further includes a first switch 51b and a second switch 52b for user operation. The user can control the operating state of the console tool 100b through the first switch 51b and the second switch 52b. Specifically, referring to fig. 6, a first switch 51b and a second switch 52b are provided at the side of the table 10. Thus, a user can operate the switch more conveniently, and the workpiece can be prevented from touching the switch by mistake, so that the processing is affected.

Specifically, the first switch 51b is a mode switch of the table tool 100b, and the user can place the table tool 100b in different operation modes by operating the first switch 51 b. When the user operates the first switch 51b in the "1" gear, the stage tool 100b is in the first operation mode, i.e., the smart mode. When the user operates the first switch in the "2" gear, the bench tool 100b is in the second operation mode, i.e., the normal mode.

The second switch 52b includes a start switch 521b and an off switch 522b. Wherein, when the first switch 51b is in the "1" gear, the bench tool 100b is in the intelligent mode. When the first switch 51b is in the "2" gear, the stage tool 100b is in the normal mode.

Specifically, when the first switch 51b is in the "2" gear, the stage tool 100b is in the normal mode, and the user can control the start and stop of the stage tool 100b by operating the second switch 52b. Wherein the start switch 521b is used for controlling the start of the motor 30, and the off switch 522b is used for controlling the off of the motor 30. The user activates the start switch 521b and the controller 70b controls the motor 30 to be powered on to drive the saw blade to rotate, thereby performing the cutting function of the table-type tool. When the user ends the cutting operation, the off switch 522b is triggered, and the controller 70b controls the motor 30 to be turned off. When the user wants to start the table type tool 100b again to make a cut, the start switch 521b needs to be triggered again.

When the first switch 51b is in the "1" gear, the table-type tool 100b is in the intelligent mode, the user triggers the start switch 521b, and the controller 70b controls the motor 30 to be powered on to drive the saw blade to rotate, so that the cutting function of the table-type tool is performed. Unlike the conventional mode described above, when the table-type tool 100b operates in the smart mode, the user does not need to control the motor 30b to stop driving the saw blade by manually operating the trigger off switch 522b. The turning off of the stage tool 100b is not performed by the off switch 522b, but is determined by the stage tool 100b itself. The above determination method will be described in detail below. When the user wants to start the table type tool 100b again to make a cut, the start switch 521b needs to be triggered again.

The bench tool provided by the application has various working modes, and has an automatic shutdown function in an intelligent mode. Thus, a plurality of working modes are set, and different working demands of users can be met. By setting the intelligent mode, the electric energy in the power supply device can be saved and the endurance time of the power supply device can be improved on the premise of no manual operation of a user.

Next, the circuit principle of the second switch 52b will be described with reference to fig. 9. In some embodiments, the second switch 52b is provided as an electromagnetic switch composed of a start switch 521b, an off switch 522b, and a relay 523 b. The start switch 521b is a normally open type micro switch, and the off switch 522b is a normally closed type micro switch.

When the user presses the start switch 521b, since the off switch 522b is a normally closed micro switch, the bat+ generates 12V voltage through the start switch 521b, the off switch 522b and the power conversion circuit 1, and further triggers the switch tube Q5 to be turned on, and the enable terminal of the relay 523b is powered on to trigger the main switch 524b of the relay 523b to be turned on, so that the AC terminal is kept always turned on, and the power conversion circuit 1 continuously outputs 12V voltage. The above process can be understood as the second switch 52b being turned on, i.e. the electromagnetic switch being turned on. When the controller 70b obtains that the second switch 52b is in the on state, it outputs a control signal to the driving circuit to drive the motor 30 to rotate.

When the first switch 51b is in the "2" gear, the bench tool 100b is in the normal mode, and the user needs to trigger the off switch 522b, thereby realizing the shutdown function. Specifically, with continued reference to fig. 8, when the switch-off 522b is pressed, the circuit across the AC is cut off, the +12v loop power supply is cut off, the switch Q5 is turned off, and the enable terminal of the relay 523b is powered down, so that the BC is turned off, so that the AC is kept in the off state all the time. The above process can be understood as the second switch 52b being turned off, i.e. the electromagnetic switch being turned off. When the controller 70b acquires that the second switch 52b is in the off state, it controls the stop of the rotation of the motor 30 b.

When the first switch 51b is in the "1" gear, the table-type tool 100b is in the intelligent mode, and the controller 70b directly controls the stop rotation of the control motor 30 b.

In the present embodiment, when the stage tool 100b is set to the smart mode, it has the function of automatic shutdown. Specifically, when the bench tool is in the intelligent mode, the controller adjusts the rotation speed of the motor to be the first rotation speed after acquiring the preset time of the load removal signal of the workpiece. In some embodiments, the load shedding signal is related to a first signal output by the sensing device or an operating parameter of the motor. Specifically, the operating parameters of the motor include, but are not limited to, the operating current or rotational speed of the motor. In some embodiments, the preset time is greater than or equal to 400ms and less than or equal to 600ms. In some embodiments, the preset time is 500ms. In some embodiments, the first rotational speed is 0. In other embodiments, the first rotational speed is a lower rotational speed greater than 0. It will be appreciated that when the bench tool 100b is in the smart mode, the controller is configured to: and adjusting the rotating speed of the motor to be the first rotating speed based on the acquired first signal or the working parameter of the motor.

Next, a flowchart of a control principle of the different modes of the stage tool 100b in the present embodiment will be described with reference to fig. 10.

S31: triggering a starting switch;

s32: judging whether the current first switch is in a 1 gear or not, if not, executing a step S33; if yes, executing step S35;

s33: the controller controls the motor to start;

s34: judging whether the turn-off switch is triggered, if yes, executing step S37; if not, executing step S34;

s35: the controller controls the motor to start;

s36: acquiring a load removal signal of the workpiece, and if so, executing a step S37; if not, executing step S36;

s37: the controller controls the motor to be turned off.

Next, the operation of the stage tool 100b in the smart mode will be described with reference to fig. 11 and 12.

S41: the motor is started.

When the first switch 51b is in the "1" position, the start switch 521b is triggered, the motor is started, the saw blade starts to rotate, the table-type tool 100b enters the idle state, and the workpiece 40 is positioned in front of the sensing device 60b as shown in fig. 11 (a).

S42: the no-load current and no-load rotation speed of the motor are obtained.

When the table tool 100b is in the idle stage, the controller 70b acquires the idle current of the motor and the idle rotation speed.

S43: a first signal output by the sensing device is acquired.

When the stage tool 100b is in the idle stage, the first signal output by the sensing device is used to indicate whether the workpiece is detected. For example, when the first signal output by the sensing device is 0, it indicates that the workpiece is not detected. When the first signal output by the sensing device is 1, the detection of the workpiece is indicated.

S44: judging whether to enter a loading stage, if so, executing a step S45; if not, step S42 is performed.

As the user starts the operation, the stage tool 100b enters a loading stage as shown in (b) and (c) in fig. 11. Specifically, the controller 70b determines the condition for the stage tool 100b to enter the loading stage: (1) The stage tool 100b is set to enter the loading mode when the first signal output by the sensing device 60b is 1. (2) The controller 70b acquires the operating current and the rotational speed of the motor in real time, and sets the stage tool 100b to enter the loading mode when the difference between the operating current and the no-load current is greater than or equal to the first current threshold and the difference between the rotational speed and the no-load rotational speed is greater than or equal to 500 rpm. Note that, if the condition (1) or the condition (2) is satisfied, the stage tool 100b may be considered to have entered the loading stage.

S45: and acquiring the working current and the rotating speed of the motor of the bench tool in the loading state.

S46: a first signal output by the sensing device is acquired.

S47: judging whether to enter a load removal stage, if so, executing S48; if not, step S45 is performed.

With the completion of the processing of the workpiece 40, the stage tool 100b enters a load removal stage shown in fig. 10 (d). When the controller 70b determines that the stage tool 100b enters the load removal stage, i.e., the load removal signal is obtained, the motor is controlled to stop driving the saw blade to rotate.

Specifically, the controller 70b determines the condition for the stage tool 100b to enter the load removal stage: (1) The first signal output by the sensing device 60b indicates that no workpiece is detected, and the stage tool is determined to enter the load shedding stage. (2) The controller 70b obtains the operating current and the rotational speed of the motor in real time, and sets the stage tool 100b to enter the load removal mode when the difference between the operating current and the idle current is less than or equal to the second current threshold and the difference between the rotational speed and the idle rotational speed is less than or equal to 2000 rpm. It should be noted that satisfying both the condition (1) and the condition (2) recognizes that the stage tool 100b has entered the load removal stage. It will be appreciated that the load shedding signal described above is related to the first signal output by the sensing device 60b or the operating parameter of the motor. When the stage tool enters the load removal stage, the controller is considered to receive the load removal signal. In this embodiment, the first current threshold and the second current threshold are set to 7A,

s48: the controller adjusts the rotation speed of the motor to be the first rotation speed after the preset time.

And after the controller acquires the load removal signal, delaying the preset time to control the motor rotation speed to be the first rotation speed. In this embodiment, the preset time is set to 500ms and the first rotation speed is set to 0.

In some embodiments, the bench-type tool 100b further comprises a power supply device (not shown) electrically connected to the bench-type tool 100b to provide power to the bench-type tool 100b. The power supply means may be a battery pack or a mains connector. The power supply device in this embodiment is provided as a battery pack detachably connected to the stage tool 100b. The stage-type tool 100b in the present embodiment also has an electric quantity indicating function for indicating the remaining electric quantity of the power supply device. Specifically, the stage-type tool 100b includes a power indicating key and a power indicating lamp that can be operated by a user. When the user presses the electric quantity indicating key, the electric quantity indicating lamp indicates the residual electric energy of the current power supply device and automatically extinguishes after a period of time. In the application, the electric quantity indicating key and the electric quantity indicating lamp can be arranged on the workbench or the power supply device. Of course, the electric quantity indicating key and the electric quantity indicating lamp can be arranged relatively close to each other or can be arranged separately. The specific positions of the electric quantity indicating key and the electric quantity indicating lamp are not limited by the application.

Note that the above is only a preferred embodiment of the present application and the technical principle applied. It will be understood by those skilled in the art that the present application is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the application. Therefore, while the application has been described in connection with the above embodiments, the application is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the application, which is set forth in the following claims.

Claims (13)

1. A bench-type tool comprising:

a workbench provided with a working plane for placing a workpiece;

a saw blade acting on a workpiece;

a motor for driving the saw blade to rotate;

a controller for controlling rotation of the motor;

the sensing device is electrically connected with the controller and is used for sensing the state of the workpiece and outputting a first signal to the controller;

wherein, still include:

a first switch for a user to select at least two modes of operation of the bench-type tool;

when the stage tool is in the first mode of operation, the controller is configured to: and adjusting the rotating speed of the motor to be a first rotating speed based on the acquired first signal or the working parameter of the motor.

2. The bench tool of claim 1 further comprising a second switch operable by a user, the second switch configured as an electromagnetic switch; the second switch includes a start switch and an off switch for user operation.

3. The bench tool of claim 2 wherein when the bench tool is in the first or second mode of operation, the controller is configured to: and when the second switch is in a conducting state, outputting a control signal to the driving circuit to drive the motor to rotate.

4. A bench tool as in claim 3, wherein when the bench tool is in the second mode of operation, the controller is configured to: and controlling the rotating speed of the motor to be the first rotating speed when the second switch is in an off state.

5. The bench tool of claim 1 wherein the sensing means comprises at least one sensor disposed on a front side of the saw blade; the distance between the sensor and the saw blade is more than 0 and less than or equal to 20mm.

6. The bench tool of claim 5 wherein said sensor comprises a capacitive proximity switch, an inductive proximity switch or an optoelectronic switch.

7. The bench tool of claim 1 wherein the operating parameter of the motor comprises an operating current or a rotational speed of the motor.

8. The bench tool of claim 1 wherein the first rotational speed is set to 0.

9. The bench-type tool of claim 1 further comprising a power supply means removably mounted to the bench-type tool for providing power to the bench-type tool.

10. A control method of a stage tool, the stage tool comprising:

a workbench provided with a working plane for placing a workpiece;

a saw blade acting on a workpiece;

a motor for driving the saw blade to rotate;

a first switch for a user to select at least two modes of operation of the bench-type tool;

a sensing device for sensing a state of the workpiece;

a controller electrically connected to at least the sensing device;

the control method comprises the following steps:

and when the working mode of the bench tool is in the first working mode, the controller adjusts the rotating speed of the motor to be the first rotating speed after acquiring the preset time of the load removing signal of the workpiece.

11. The control method according to claim 10, wherein the load removal signal is related to a first signal output from the sensing device or an operation parameter of the motor.

12. The control method according to claim 11, characterized in that the operating parameters of the motor include at least an operating current or a rotational speed of the motor.

13. The control method according to claim 12, characterized in that the preset time is 400ms or more and 600ms or less.