CN219169765U

CN219169765U - Electric tool

Info

Publication number: CN219169765U
Application number: CN202223613663.XU
Authority: CN
Inventors: 崔松松; 穆小涛
Original assignee: Jiangsu Dongcheng Tools Technology Co Ltd
Current assignee: Jiangsu Dongcheng Tools Technology Co Ltd
Priority date: 2022-12-29
Filing date: 2022-12-29
Publication date: 2023-06-13
Anticipated expiration: 2032-12-29

Abstract

The utility model discloses an electric tool, comprising: the electric tool comprises a working state detection module connected with the controller and used for detecting working parameters of the electric tool in a loading state and an unloading state, and the controller controls the tool to stop according to whether the working parameters detected by the working state detection module meet preset conditions or not. The utility model realizes the detection of the working parameters by the newly added working state detection module, thereby judging whether to stop the machine for protection according to the working state of the electric tool, and having high safety performance.

Description

Electric tool

[ field of technology ]

The utility model relates to the technical field of electric tools, in particular to a cutting type electric tool.

[ background Art ]

The electric tool is a working tool which is widely used and is held by hands, and generally comprises a transmission assembly, a motor, a power supply assembly (such as a battery), a controller and the like, wherein the power supply assembly is loaded to supply current to drive the motor to rotate, and then the working head is driven to work through the transmission assembly. When a user uses a cutting tool to cut, the user can operate the switch to enable the cutting tool to cut continuously, the cutting part can receive certain resistance due to an object to be cut, if the user cannot predict when the cutting is finished due to interference of sight or environment, the user still continues to press down the cutting forcefully at the cutting finishing moment, when the cutting is finished, the resistance disappears, and the cutting part can injure the user due to inertia force, so that the safety is lower.

Referring to chinese patent No. CN208019534U, published in 2018, 10 and 30, it is disclosed that the electric cutting tool includes a current detecting device for determining whether the tool is an idle current or a load current, and when the relation between the object to be cut and the cutting portion is changed from contact to non-contact, the current is changed from the load current to the idle current, so as to determine that the object to be cut has been cut off, and brake the cutting portion. The tool can be braked after cutting each time, continuous cutting cannot be realized, and a trigger is triggered after cutting each time, so that the working efficiency is low.

Therefore, it is necessary to design a power tool with high safety and high working efficiency to solve the above problems.

[ utility model ]

In order to solve the above problems, the present utility model provides an electric tool with high safety and high working efficiency.

The utility model solves the problems in the prior art by adopting the following technical scheme: a power tool, comprising: the cutting device comprises a shell, a cutting piece arranged on the shell, a motor accommodated in the shell and a controller connected with the motor, wherein the controller controls the cutting piece to perform cutting action, the electric tool comprises a working state detection module connected with the controller and is used for detecting working parameters of the electric tool in a loaded state and an unloaded state, and the controller controls whether the electric tool is stopped or not according to whether the working parameters detected by the working state detection module meet preset conditions or not.

The further improvement scheme is as follows: the working state detection module is a current detection module and is used for detecting current when the motor works, and the working parameters comprise load current in a load state and no-load current in a no-load state.

The further improvement scheme is as follows: the controller stores a preset load current and a preset no-load current, and the working parameter is a preset time from the preset load current to the preset no-load current.

The further improvement scheme is as follows: the preset condition is that the time from the loaded current to the unloaded current is not longer than the preset time, and the controller controls the motor to brake.

The further improvement scheme is as follows: and if the time from the on-load current to the off-load current is longer than the preset time, the controller controls the motor to continue to run.

The further improvement scheme is as follows: the working state detection module is an acceleration detection module and is used for detecting the acceleration of the working direction of the electric tool.

The further improvement scheme is as follows: the controller stores a preset acceleration value.

The further improvement scheme is as follows: and when the preset condition is that the acceleration of the working direction of the electric tool is larger than the preset acceleration value, the controller controls the motor to brake.

The further improvement scheme is as follows: and when the acceleration of the working direction of the electric tool is not greater than the preset acceleration value, the controller controls the motor to continue to operate.

The further improvement scheme is as follows: the on-load state is that the cutting piece does not cut off the object to be cut, and the off-load state is that the cutting piece cuts off the object to be cut.

Compared with the prior art, the utility model has the following beneficial effects: the electric tool is provided with a working state detection module connected with the controller and used for detecting working parameters of the electric tool, wherein the working parameters are loaded and unloaded, and the controller controls whether the electric tool is stopped or not according to whether the working parameters detected by the working state detection module meet preset conditions. The utility model realizes the detection of the working parameters by the newly added working state detection module, thereby judging whether to stop the machine for protection according to the working state of the electric tool, and having high safety performance.

[ description of the drawings ]

The following describes the embodiments of the present utility model in further detail with reference to the accompanying drawings:

FIG. 1 is a perspective view of the power tool of the present utility model;

FIG. 2 is a schematic circuit diagram of a power tool according to a first embodiment of the present utility model;

FIG. 3 is a current waveform diagram of the motor of the present utility model;

FIG. 4 is a schematic view of the power tool of the present utility model in a loaded state;

FIG. 5 is a schematic view of the power tool of the present utility model in an empty state;

fig. 6 is a schematic circuit diagram of a power tool according to a second embodiment of the present utility model.

Meaning of reference numerals in the drawings:

100. electric tool 101, housing 102, cutting member 103, trigger 1, motor 2, controller 3, driving circuit 4, voltage detection module 5, object 6 to be cut, acceleration detection module

[ detailed description ] of the utility model

The utility model will be described in further detail with reference to the drawings and embodiments.

Referring to fig. 1, an electric tool 100 according to the present utility model is shown, and in this embodiment, the electric tool 100 is a chain saw, but may be any other electric tool such as a circular saw. The power tool 100 includes: the cutting device comprises a shell 101, a cutting member 102, a trigger 103, a motor 1 and a controller 2, wherein the cutting member 102 is installed in the shell 101, the motor 1 is installed in the shell 101, the controller 2 is connected with the motor 1, a user presses the trigger 103, and the controller 2 drives the motor 1 to control the cutting member 102 to perform cutting action. The electric tool 100 includes a working state detection module connected to the controller 2, and configured to detect working parameters of the electric tool 100 in a loaded state and an unloaded state, where the controller 2 controls whether the electric tool 100 is stopped according to whether the working parameters in the loaded state to the unloaded state meet preset conditions.

Referring to fig. 2, a circuit diagram of a first embodiment is shown, which includes a positive electrode and a negative electrode of a power supply, a driving circuit 3 connected between the positive electrode and the negative electrode, the driving circuit 3 is connected to the motor 1 and the controller 2, the driving circuit 3 includes an upper bridge arm and a lower bridge arm connected in series, connection points of the upper bridge arm and the lower bridge arm are respectively connected to three-phase windings of the motor, the upper bridge arm includes a first upper bridge arm, a second upper bridge arm and a third upper bridge arm, the lower bridge arm includes a first lower bridge arm, a second lower bridge arm and a third lower bridge arm, the upper bridge arm includes upper switching tubes Q1 to Q3 connected to each upper bridge arm respectively, the lower bridge arm includes lower switching tubes Q4 to Q6 connected to each lower bridge arm respectively, the switching tubes Q1 to Q6 are respectively connected in parallel with diodes D1 to D6 for freewheeling, the three-phase windings U, V, W of the motor 1 are respectively connected to connection points of the upper bridge arm and the lower bridge arm, the motor 1 adopts a two-two three-phase six-state working mode, so that one of the upper bridge arm and the lower bridge arm can be simultaneously turned on two or more of the upper and lower bridge arms are not turned on. The working state detection module is a current detection module, the current detection module comprises a resistor R connected to the negative electrode and a voltage detection module 4 connected to two ends of the resistor R in parallel, the voltage detection module 4 is connected to the controller 2 and is used for detecting current when the motor 1 works, the working parameters comprise load current in a load state and no-load current in a no-load state, the controller 2 stores preset load current and preset no-load current, and the working parameters are from preset load current to preset no-load current for preset time. Referring to fig. 3, in this embodiment, the preset load current a1 is 20A, the preset idle current a2 is 5A, and the preset time is 1s. Referring to fig. 4, which is a schematic diagram of the loaded state of the electric tool 100, that is, the cutting member 102 does not cut off the object 5 to be cut, the current gradually increases from 0 when the electric tool 100 starts cutting, the loaded current increases to the preset loaded current a1 when the electric tool 100 cuts normally, and the loaded current decreases to the preset unloaded current a2 when the electric tool 100 cuts completely, as shown in fig. 5, the controller 2 detects that the time t1 from the preset loaded current a1 to the preset unloaded current a2 is compared with the preset time, the preset condition is that the time t1 is not greater than the preset time, which means that the pressure applied by the user to the electric tool 100 is greater, and the cutting member 102 is easily hit to the user due to inertia at the moment of cutting completion, so the controller 2 controls the motor 1 to brake, and the switching tubes Q4, Q5, Q6 are turned on to short circuit the motor 1; if the preset time is longer than the preset time, it means that the user applies a small pressure to the electric tool 100, and the cutting member 102 will not be hit by the user due to inertia, so that the controller 2 controls the motor 1 to continue to operate.

Referring to fig. 6, which is a circuit diagram of a second embodiment, the operation state detection module is an acceleration detection module 6 for detecting an acceleration of the electric tool 100 in an operation direction, the acceleration detection module 6 includes an acceleration sensor connected to the controller 2, in this embodiment, the electric tool 100 cuts the object 5 to be cut downward, and the acceleration detection module 6 detects the downward acceleration. The controller 2 stores a preset acceleration value, and when the preset condition is that the acceleration of the electric tool 100 in the working direction is greater than the preset acceleration value, it indicates that the pressure applied by the user to the electric tool 100 is greater, and the cutting member 102 is easy to strike the user due to inertia at the moment of cutting completion, so that the controller 2 controls the motor 1 to brake, and the switching tubes Q4, Q5 and Q6 are conducted to short the motor 1; if the acceleration of the electric tool 100 in the working direction is not greater than the preset acceleration value, it indicates that the pressure applied by the user to the electric tool 100 is small, and the cutting member 102 will not be hit by the user due to inertia, so the controller 2 controls the motor 1 to continue to operate.

The electric tool 100 is provided with the working state detection module connected with the controller 2 and is used for detecting the loaded and unloaded working parameters of the electric tool 100, the controller 2 interacts with the working state detection module, and whether the electric tool is stopped is controlled according to whether the working parameters detected by the working state detection module meet the preset conditions. The utility model realizes the detection of the working parameters by the newly added working state detection module, thereby judging whether to stop the machine for protection according to the working state of the electric tool, and having high safety performance.

The present utility model is not limited to the above-described embodiments. Those skilled in the art will readily appreciate that many other alternatives to the power tool of the present utility model are possible without departing from the spirit and scope of the present utility model. The protection scope of the present utility model is subject to the claims.

Claims

1. A power tool, comprising: the cutting device comprises a shell, a cutting piece arranged on the shell, a motor accommodated in the shell and a controller connected with the motor, wherein the controller controls the cutting piece to perform cutting action; the method is characterized in that: the electric tool comprises a working state detection module connected to the controller and used for detecting working parameters of the electric tool in a loaded state and an unloaded state, and the controller controls whether the electric tool is stopped or not according to whether the working parameters detected by the working state detection module meet preset conditions.

2. The power tool of claim 1, wherein: the working state detection module is a current detection module and is used for detecting current when the motor works, and the working parameters comprise load current in a load state and no-load current in a no-load state.

3. The power tool of claim 2, wherein: the controller stores a preset load current and a preset no-load current, and the working parameter is a preset time from the preset load current to the preset no-load current.

4. A power tool according to claim 3, wherein: the preset condition is that the time from the loaded current to the unloaded current is not longer than the preset time, and the controller controls the motor to brake.

5. The power tool of claim 4, wherein: and if the time from the on-load current to the off-load current is longer than the preset time, the controller controls the motor to continue to run.

6. The power tool of claim 1, wherein: the working state detection module is an acceleration detection module and is used for detecting the acceleration of the working direction of the electric tool.

7. The power tool of claim 6, wherein: the controller stores a preset acceleration value.

8. The power tool of claim 7, wherein: and when the preset condition is that the acceleration of the working direction of the electric tool is larger than the preset acceleration value, the controller controls the motor to brake.

9. The power tool of claim 8, wherein: and when the acceleration of the working direction of the electric tool is not greater than the preset acceleration value, the controller controls the motor to continue to operate.

10. The power tool of claim 1, wherein: the on-load state is that the cutting piece does not cut off the object to be cut, and the off-load state is that the cutting piece cuts off the object to be cut.