CN109590949B - Control device and method for power tool and power tool - Google Patents
Control device and method for power tool and power tool Download PDFInfo
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- CN109590949B CN109590949B CN201710919435.XA CN201710919435A CN109590949B CN 109590949 B CN109590949 B CN 109590949B CN 201710919435 A CN201710919435 A CN 201710919435A CN 109590949 B CN109590949 B CN 109590949B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D11/00—Portable percussive tools with electromotor or other motor drive
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D17/00—Details of, or accessories for, portable power-driven percussive tools
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- Processing Of Stones Or Stones Resemblance Materials (AREA)
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Abstract
The present disclosure relates to a control device and method for a power tool, and a power tool. The power tool includes a power source and a motor, the apparatus including: the control switch is used for disconnecting or connecting the electrical connection between the power supply and the motor; a changeover switch that switches the power tool between a first operation mode and a second operation mode according to a user operation; a control component connected with the control switch and the transfer switch respectively, the control component configured to: when the power tool is in the first working mode and the control switch is closed, the characteristic variable of the power tool is controlled to generate a plurality of periodic changes according to a preset periodic change rule. According to the control device and method for the power tool and the power tool, in the first working mode, the process of multiple periodic changes is not affected by user operation, the working stability of the power tool can be effectively improved, harmful damage of the power tool to a working surface is reduced, and the success rate of operations such as punching on the working surface is improved.
Description
Technical Field
The present disclosure relates to the field of power tools, and in particular, to a control device and method for a power tool and a power tool.
Background
With the rapid development of power tools, workers can drill holes on the working surface of materials such as tiles and cement with the aid of power tools such as electric hammers. However, in the related art, the impact of the power tool against the work surface may cause harmful damage to the work surface, such as chipping of the tile during the drilling process.
Disclosure of Invention
In view of the above, the present disclosure provides a control device and method for a power tool and a power tool.
According to an aspect of the present disclosure, there is provided a control apparatus for a power tool including a power source and a motor, the apparatus comprising:
a control switch for disconnecting or connecting the electrical connection between the power source and the motor;
a changeover switch that switches the power tool between a first operation mode and a second operation mode according to a user operation;
a control component connected to the control switch and the transfer switch, respectively, the control component configured to:
and when the power tool is in the first working mode and the control switch is closed, controlling the characteristic variable of the power tool to generate multiple periodic changes according to a preset periodic change rule.
For the above apparatus, in one possible implementation, the control component is further configured to:
controlling the characteristic variable to maintain a first value after the plurality of periodic changes when the power tool is in the first operating mode and the control switch is closed.
For the above apparatus, in one possible implementation, controlling the characteristic variable to maintain a first value includes:
and controlling the characteristic variable to keep a first value according to a preset keeping rule.
For the above device, in one possible implementation manner, the controlling the characteristic variable of the power tool to generate a plurality of periodic changes according to a preset periodic change rule includes:
controlling a characteristic variable of the power tool to generate at least one first period change, wherein each first period change comprises:
rising from an initial value to a second value within a first time;
maintaining the second value for a second time;
decreasing from the second value to a third value within a third time;
and keeping the third value for running for a fourth time.
For the above apparatus, in one possible implementation, the each first period change includes:
increasing from the initial value to a second value at a first acceleration over a first time;
maintaining the second value for a second time;
decreasing from the second value to a third value at a second acceleration over a third time;
and keeping the third value for running for a fourth time.
For the above apparatus, in one possible implementation, the second value is less than or equal to the first value, the initial value is less than or equal to the third value,
wherein the characteristic variable retains the first value after the plurality of cyclical variations.
With regard to the above apparatus, in a possible implementation manner, controlling the characteristic variable of the power tool to generate a plurality of periodic changes according to a preset periodic change rule further includes:
after controlling the characteristic variable of the power tool to generate at least one first periodic change, controlling the characteristic variable of the power tool to generate at least one second periodic change, wherein each second periodic change comprises:
rising from the third value to a fourth value within a fifth time;
maintaining the fourth value for a sixth time;
decreasing from the fourth value to a fifth value within a seventh time;
and keeping the fifth value for running for an eighth time.
For the above apparatus, in a possible implementation manner, the each second period change includes:
increasing from the third value to a fourth value at a third acceleration within a fifth time;
maintaining the fourth value for a sixth time;
decreasing from the fourth value to a fifth value at a fourth acceleration within a seventh time;
and keeping the fifth value for running for an eighth time.
For the above apparatus, in one possible implementation, the second value is less than or equal to the fourth value, the fourth value is less than or equal to the first value,
wherein the characteristic variable retains the first value after the plurality of cyclical variations.
For the above apparatus, in one possible implementation, the initial value is less than or equal to the third value, and the third value is less than or equal to the fifth value.
For the above apparatus, in one possible implementation, the control component is further configured to:
and when the power tool is in the second working mode and the control switch is closed, controlling the characteristic variable of the power tool according to the operation amount of the control switch by a user.
With regard to the above apparatus, in one possible implementation, the switching of the power tool between the first operating mode and the second operating mode includes any one of:
switching the power tool between a first working mode and a second working mode according to the position of the switch;
and switching the power tool between a first working mode and a second working mode according to the pressing times of the selector switch.
With the above arrangement, in one possible implementation, the characteristic variable includes a rotational speed of the motor.
For the above device, in a possible implementation manner, the characteristic variable further includes a duty ratio, where the duty ratio is a ratio of the power-on time of the motor to the total power-on and power-off time.
According to another aspect of the present disclosure, there is provided a control method for a power tool including a power source and a motor, the method including:
judging the states of a control switch and a selector switch of the power tool, wherein the selector switch switches the power tool between a first working mode and a second working mode according to user operation;
and under the condition that the power tool is in a first working mode and the control switch is closed, controlling the characteristic variable of the power tool to generate a plurality of periodic changes according to a preset periodic change rule.
For the above method, in a possible implementation manner, the method further includes:
controlling the characteristic variable to maintain a first value after the plurality of periodic changes.
For the above method, in one possible implementation, controlling the characteristic variable to maintain a first value includes:
and controlling the characteristic variable to keep a first value according to a preset keeping rule.
For the above method, in one possible implementation, controlling the characteristic variable of the power tool to generate a plurality of periodic changes according to a preset periodic change rule includes:
controlling a characteristic variable of the power tool to generate at least one first period change, wherein each first period change comprises:
rising from an initial value to a second value within a first time;
maintaining the second value for a second time;
decreasing from the second value to a third value within a third time;
and keeping the third value for running for a fourth time.
For the above method, in one possible implementation, the each first period change includes:
increasing from the initial value to a second value at a first acceleration over a first time;
maintaining the second value for a second time;
decreasing from the second value to a third value at a second acceleration over a third time;
and keeping the third value for running for a fourth time.
For the above method, in one possible implementation, the second value is less than or equal to the first value, the initial value is less than or equal to the third value,
wherein the characteristic variable retains the first value after the plurality of cyclical variations.
For the above method, in a possible implementation manner, controlling the characteristic variable of the power tool to generate a plurality of periodic changes according to a preset periodic change rule further includes:
after controlling the characteristic variable of the power tool to generate at least one first periodic change, controlling the characteristic variable of the power tool to generate at least one second periodic change, wherein each second periodic change comprises:
rising from the third value to a fourth value within a fifth time;
maintaining the fourth value for a sixth time;
decreasing from the fourth value to a fifth value within a seventh time;
and keeping the fifth value for running for an eighth time.
For the above method, in a possible implementation manner, the each second period change includes:
increasing from the third value to a fourth value at a third acceleration within a fifth time;
maintaining the fourth value for a sixth time;
decreasing from the fourth value to a fifth value at a fourth acceleration within a seventh time;
and keeping the fifth value for running for an eighth time.
For the above method, in one possible implementation, the second value is less than or equal to the fourth value, the fourth value is less than or equal to the first value,
wherein the characteristic variable retains the first value after the plurality of cyclical variations.
For the above method, in one possible implementation, the initial value is less than or equal to the third value, and the third value is less than or equal to the fifth value.
For the above method, in one possible implementation, the method further includes:
and when the power tool is in the second working mode, controlling the characteristic variable of the power tool according to the operation amount of the control switch by the user.
With regard to the above method, in one possible implementation, the switching of the power tool between the first operating mode and the second operating mode includes any one of:
switching the power tool between a first working mode and a second working mode according to the position of the switch;
and switching the power tool between a first working mode and a second working mode according to the pressing times of the selector switch.
With regard to the above method, in one possible implementation, the characteristic variable includes a rotational speed of the motor.
For the method, in a possible implementation manner, the characteristic variable further includes a duty ratio, where the duty ratio is a ratio of the power-on time of the motor to the total power-on and power-off time.
According to another aspect of the present disclosure, there is provided a power tool including: according to the control device for the power tool described above.
According to the control device and method for the power tool and the power tool, when the power tool is started and works in the first working mode, the control component controls the characteristic variable of the power tool to automatically generate multiple periodic changes according to the preset periodic change rule, so that harmful damage to a working surface caused by the power tool is effectively reduced, and the success rate of operations such as punching on the working surface by the power tool is improved. The process of multiple periodic changes is automatically carried out according to a preset periodic change rule, the influence of a user on the operation of the control switch and the change-over switch is avoided, the working stability of the power tool can be effectively improved, and the working fluctuation of the power tool is reduced.
Other features and aspects of the present disclosure will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features, and aspects of the disclosure and, together with the description, serve to explain the principles of the disclosure.
FIG. 1 illustrates a block diagram of a control device for a power tool according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram illustrating a second mode of operation in accordance with an exemplary embodiment;
FIG. 3 is a schematic diagram illustrating an example one of a first mode of operation in accordance with an exemplary embodiment;
FIG. 4 is a schematic diagram illustrating an example two of a first mode of operation, according to an example embodiment;
FIG. 5 is a schematic diagram illustrating an example three of a first mode of operation, according to an exemplary embodiment;
FIG. 6 is a schematic diagram illustrating an example four of a first work simulation in accordance with an exemplary embodiment;
FIG. 7a is a front view of a power tool shown in accordance with an exemplary embodiment;
FIG. 7b is a top view of a power tool shown in accordance with an exemplary embodiment;
FIG. 8 is a flowchart illustrating a control method for a power tool according to an exemplary embodiment;
FIG. 9 is a flowchart illustrating a control method for a power tool according to an exemplary embodiment;
FIG. 10 is a flowchart illustrating a control method for a power tool according to an exemplary embodiment.
Detailed Description
Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present disclosure. It will be understood by those skilled in the art that the present disclosure may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present disclosure.
Fig. 1 shows a block diagram of a control device for a power tool according to an embodiment of the present disclosure. As shown in fig. 1, the power tool may include a power source 1 and a motor 2, and the control means for the power tool may include a control switch 3, a changeover switch 4, and a control assembly 5. The control switch 3 is used to open or close the electrical connection between the power source 1 and the motor 2. The changeover switch 4 switches the power tool between the first operation mode and the second operation mode in accordance with user operation. The control component 5 is electrically connected to the control switch 3 and the switch 4, respectively, and the control component 5 is configured to: when the power tool is in the first working mode and the control switch is closed, the characteristic variable of the power tool is controlled to generate a plurality of periodic changes according to a preset periodic change rule.
In the present embodiment, the characteristic variables may include parameters describing the operating state of the motor, such as the rotation speed of the motor and the hammer frequency. Wherein the hammering frequency may be greater than 2000 times/second. The period change rule can be set according to the actual requirements of the material of the working surface and the like, and the disclosure does not limit the rule. Therefore, when the power tool is started and works in the first working mode, the control assembly controls the characteristic variable of the power tool to automatically generate a plurality of periodic changes according to a preset periodic change rule, and the process of the plurality of periodic changes is not influenced by the operation of a user on the control switch and the change-over switch. The working stability of the power tool can be effectively improved, and the working fluctuation of the power tool is reduced.
In one possible implementation, the control component 5 may be further configured to: when the power tool is in the first operating mode and the control switch is closed, the control characteristic variable remains at the first value after a plurality of cyclical changes.
In one possible implementation, the control component 5 is further configured to: controlling the characteristic variable to maintain the first value may include controlling the characteristic variable to maintain the first value according to a preset maintenance rule.
In this implementation, the holding rule may be set according to the material of the work surface, the type of work, and the like, and the present disclosure is not limited.
Therefore, when the power tool is in the first working mode and the control switch is closed, the characteristic variable of the power tool is controlled to keep the first value after being subjected to multiple periodic changes, and the whole working process of the power tool is not influenced by the operation amount of a user. The fragile and explosive working surfaces of the ceramic tiles such as the common glazed tiles, the vitrified tiles and the like can be buffered in the process of the characteristic variable of the power tool changing periodically for many times, so that the harmful damage to the working surfaces is reduced or even avoided. The specific operating state of the power tool in the first operating mode can be set by those skilled in the art according to actual needs, and the disclosure is not limited thereto.
In a possible implementation, the characteristic variable may comprise the rotational speed of the motor 2.
In one possible implementation, the characteristic variable may also be a duty cycle. The duty ratio is a ratio of the energization time of the motor 2 to the total energization/deenergization time.
In this implementation, the characteristic variable may further include other parameters such as an energization frequency capable of controlling the rotation of the motor, which is not limited by the present disclosure.
In one possible implementation, the control component 5 may be further configured to: when the power tool is in the second operation mode, the characteristic variable of the power tool is controlled according to the operation amount of the control switch 3 by the user.
In this embodiment, the characteristic variables of the power tool can be controlled in accordance with the operation amounts such as the degree of pressing the control switch by the user, the rotation angle, and the operation time of the corresponding operation. For example, the greater the force with which the user presses the control switch, the higher the rotational speed of the motor, and the longer the time the user presses, the longer the duration of the motor at the corresponding rotational speed. In this way, in the second operation mode, the characteristic variable can be manually controlled by the user according to the operation amount of the control switch by the user.
In another possible implementation, the characteristic variable may also be raised to a constant value and maintained at the constant value during operation when the power tool is in the second operating mode and the control switch 3 is closed.
FIG. 2 is a schematic diagram illustrating a second mode of operation in accordance with an exemplary embodiment. As shown in fig. 2, the operation principle and process of the second operation mode will be described by taking the characteristic variable as the rotation speed of the motor as an example. When the power tool is in the second working mode, if the fact that the pressing force of the user on the control switch is steadily increased within the time range from t0 to t1 is detected, the rotating speed of the motor is continuously increased from the initial value v0 "to the rotating speed v 1". And after t1, detecting that the user does not increase the pressing force degree on the control switch any more, and keeping the fixed pressing force degree for a certain time, and controlling the motor to stably rotate at the rotating speed v1 'according to the rotating speed v 1' determined by the current pressing force degree on the control switch by the user. Therein, the initial value v0 "may be zero, i.e. the motor accelerates from a standstill to v 1". The user can also raise or lower the rotation speed of the motor for multiple times according to actual needs, which is not limited by the disclosure.
In the first working mode, the characteristic variable of the power tool is controlled to generate a plurality of periodic changes, and the characteristic variable is controlled to keep a first value after the plurality of periodic changes. Several exemplary implementations of the power tool feature variable producing multiple periodic variations are given below. In the following example, only the rotation speed of the motor is taken as an example for description, but actually the duty ratio may also realize its periodic variation in the same way as the rotation speed of the motor, and the periodic variation process of the duty ratio in the first operation mode may refer to the specific description of the periodic variation of the characteristic variable taking the rotation speed of the motor as an example.
In one possible implementation, the controlling the characteristic variable of the power tool to make a plurality of periodic changes according to a preset periodic change rule may include: at least one first periodic variation of a characteristic variable of the power tool is controlled. Wherein, each first period change may include: rising from an initial value to a second value within a first time; keeping the second value for running for a second time; decreasing from the second value to a third value within a third time; and keeping the third value for running for a fourth time.
In this implementation, the characteristic variable may be controlled to rise from the initial value to the second value at a fixed acceleration or an unfixed acceleration, and the characteristic variable may be controlled to fall from the second value to the third value at a fixed acceleration or an unfixed acceleration, for example, the initial value may be raised to the first value in a rising manner such as a straight line (e.g., line 0 in fig. 3), a curved line (e.g., line 2 in fig. 3), a broken line (e.g., line 1 in fig. 3), and the second value may be lowered to the third value in a falling manner such as a straight line (e.g., line 5 in fig. 3), a curved line (e.g., line 3 in fig. 3), a broken line (e.g., line 4 in fig. The ascending mode and the descending mode of the value of the characteristic variable can be set by those skilled in the art according to actual needs, and the present disclosure does not limit this.
The initial value may be 0, and the first value may be a rotation speed of the motor in a normal operation.
In one possible implementation, each first cycle change may include: increasing from an initial value to a second value at a first acceleration within a first time; keeping the second value for running for a second time; decreasing from the second value to a third value at a second acceleration over a third time; and keeping the third value for running for a fourth time.
In one possible implementation, the second value may be less than or equal to the first value, and the initial value may be less than or equal to the third value.
In this implementation, the characteristic variable may be controlled to rise from an initial value to a second value at a first acceleration a1 for a first time. And, the characteristic variable may be controlled to decrease from the second value to the third value at the second acceleration a2 for a third time. The value of the first acceleration a1 and the value of the second acceleration a2 may be the same, that is, | a1| ═ a2|, and a1 ═ a2, or may be different. The first acceleration and the second acceleration may be set according to the material properties and the actual needs of the working surface. It should be understood that the first acceleration and the second acceleration can be set by those skilled in the art according to actual needs, and the present disclosure is not limited thereto.
Fig. 3 is a schematic diagram illustrating an example one of a first mode of operation, according to an example embodiment. In example one, the control characteristic variable maintains the first value after a plurality of first periodic changes of the control characteristic variable. As shown in fig. 3, the first example will be described by taking the characteristic variable as the rotation speed of the motor as an example. Wherein, the second value is v1 same as the first value, and the third value is v0 same as the initial value.
In the first period change, the rotating speed of the motor is controlled to be increased from the initial value v0 to a second value v1 within t 0-t 1, and then the motor is controlled to rotate at the second value v1 within t 1-t 2. And in the period from t2 to t3, the rotating speed of the motor is controlled to be reduced from the second value v1 to the third value v0, and then in the period from t3 to t4, the motor is controlled to rotate by taking the third value v0 as the rotating speed.
In the second first periodic variation, the motor is controlled to rotate by repeating the rotation process from the time interval t0 to t4 in the time interval t4 to t 8.
Finally, in the time interval t 8-t 9, the rotation speed of the motor is controlled to be increased from the third value v0 to the first value v1, and after the rotation speed of the motor reaches the first value v1, the motor is controlled to rotate continuously at the first value v 1. In the first example, the working process of the first example is described by taking the example that the control characteristic variable generates the first period change twice, and the generation times of the first period change can be set according to actual needs, which is not limited by the disclosure.
Fig. 4 is a schematic diagram illustrating an example two of the first mode of operation, according to an example embodiment. In example two, the control characteristic variable maintains the first value after the control characteristic variable has undergone the first periodic change a plurality of times. As shown in fig. 4, example two will be described with the characteristic variable as the rotational speed of the motor as an example. Wherein the second value is V2 ' same as the first value, and the third value V1 ' is greater than the initial value V0 '. Specifically, the method comprises the following steps:
in the first period change, the rotation speed of the motor is controlled to be increased from the initial value V0 ' to the second value V2 ' within t 0-t 1, and then the motor is controlled to rotate by taking the second value V2 ' as the rotation speed within t 1-t 2. And in the range from t2 to t3, the rotating speed of the motor is controlled to be reduced from the second value V2 ' to the third value V1 ', and then in the range from t3 to t4, the motor is controlled to rotate by taking the third value V1 ' as the rotating speed.
In the second first period change, the rotation speed of the motor is controlled to be increased from the third value V1 ' to the second value V2 ' within t 4-t 5, and then the motor is controlled to rotate at the second value V2 ' within t 5-t 6. And in the range from t6 to t7, the rotating speed of the motor is controlled to be reduced from the second value V2 ' to the third value V1 ', and then in the range from t7 to t8, the motor is controlled to rotate by taking the third value V1 ' as the rotating speed.
Finally, in the period from t8 to t9, the rotation speed of the motor is controlled to be increased from the third value V1 'to the first value V2', and after the rotation speed of the motor reaches the first value V2 ', the motor is controlled to rotate continuously at the first value V2'. In the second example, the working process of the second example is described by taking the example that the control characteristic variable generates the first period change twice, and the generation times of the first period change and each rotating speed value can be set according to actual needs, which is not limited by the disclosure.
By the mode, after the motor is started (after t 0), the rotating speed of the motor does not return to zero and keeps rotating all the time, so that the condition that the motor is frequently stopped and restarted is avoided, the loss of the motor is reduced, and the problem of large current caused by restarting after the motor is braked can be avoided.
In a possible implementation manner, controlling the characteristic variable of the power tool to generate a plurality of periodic changes according to a preset periodic change rule may further include: after controlling the characteristic variable of the power tool to produce at least one first periodic change, controlling the characteristic variable of the power tool to produce at least one second periodic change. Wherein, each second period change may include: rising from the third value to a fourth value within a fifth time; keeping the fourth value for running for a sixth time; decreasing from the fourth value to the fifth value within a seventh time; and keeping the fifth value for running for the eighth time.
In this implementation, the characteristic variable may be controlled to rise from the third value to the fourth value at a fixed acceleration or an unfixed acceleration, and the characteristic variable may be controlled to fall from the fourth value to the fifth value at a fixed acceleration or an unfixed acceleration, for example, the third value may be raised to the fourth value in a straight line, a curve, or a broken line, and the fourth value may be lowered to the fifth value in a straight line, a curve, or a broken line. The ascending mode and the descending mode of the value of the characteristic variable can be set by those skilled in the art according to actual needs, and the present disclosure does not limit this.
In one possible implementation, each second period change may include: increasing from the third value to a fourth value at a third acceleration within a fifth time; keeping the fourth value for running for a sixth time; decreasing from the fourth value to a fifth value at a fourth acceleration within a seventh time; and keeping the fifth value for running for the eighth time.
In this implementation, during the fifth time, the characteristic variable may be controlled to rise from the third value to the fourth value at the third acceleration a 3. And, the characteristic variable may be controlled to decrease from the fourth value to the fifth value at the fourth acceleration a4 during the seventh time. The value of the third acceleration a3 and the value of the fourth acceleration a4 may be the same, that is, | a3| ═ a4|, and a3 ═ a4, or may be different. The third acceleration and the fourth acceleration may be set according to the material properties and the actual needs of the working surface. It should be understood that the third acceleration and the fourth acceleration can be set by those skilled in the art according to actual needs, and the present disclosure is not limited thereto.
In one possible implementation, the second value may be less than or equal to the fourth value, which may be less than or equal to the first value.
In one possible implementation, the initial value may be less than or equal to a third value, which may be less than or equal to a fifth value.
The mode can form the effect that the impact on the working surface is gradually increased from weak, further play a role in buffering and reduce the damage to the working surface.
Fig. 5 is a schematic diagram illustrating an example three of the first mode of operation, according to an example embodiment. In example three, after the control characteristic variable generates the first period change for a plurality of times, the control characteristic variable continues to generate the second period change for a plurality of times, and finally the control characteristic variable maintains the first value. As shown in fig. 5, the third example will be described by taking the characteristic variable as the rotation speed of the motor as an example. The third value and the fifth value are both v0 'as the same as the initial values, the fourth value is v 2' as the same as the first value, and the second value v1 'is smaller than the first value v 2'. Specifically, the method comprises the following steps:
in the first period change, the rotating speed of the motor is controlled to be increased from the initial value v0 ' to a second value v1 ' within t 0-t 1, and then the motor is controlled to rotate by taking the second value v1 ' as the rotating speed within t 1-t 2. And in the period from t2 to t3, the rotating speed of the motor is controlled to be reduced to a third value v0 ' from a second value v1 ', and then in the period from t3 to t4, the motor is controlled to rotate by taking the third value v0 ' as the rotating speed.
In the second periodic variation, the rotation speed of the motor is controlled to be increased from the third value v0 ' to the fourth value v2 ' within t 4-t 5, and then the motor is controlled to rotate at the fourth value v2 ' within t 5-t 6. And in the period from t6 to t7, the rotating speed of the motor is controlled to be reduced from the fourth value v2 ' to the fifth value v0 ', and then in the period from t7 to t8, the motor is controlled to rotate by taking the fifth value v0 ' as the rotating speed.
Finally, in the period from t8 to t9, the rotation speed of the motor is controlled to be increased from the fifth value v0 'to the first value v 2', and after the rotation speed of the motor reaches the first value v2 ', the motor is controlled to rotate continuously at the first value v 2'. In the third example, the working process of the third example is described by taking only the control characteristic variable as an example to generate the first period change once and the second period change once, and the generation times of the first period change and the second period change may also be set according to actual needs, which is not limited by the disclosure.
FIG. 6 is a schematic diagram illustrating example four of a first work simulation in accordance with an exemplary embodiment. In example four, after the control characteristic variable generates the first periodic variation for a plurality of times, the control characteristic variable continues to generate the second periodic variation for a plurality of times, and finally the control characteristic variable maintains the first value. As shown in fig. 6, example four will be described with the characteristic variable as the rotational speed of the motor as an example. Wherein the third value and the fifth value are both V1, and both are greater than the initial value V0; the fourth value is V3, the same as the first value, and the second value V2 is less than the first value V3. Specifically, the method comprises the following steps:
in the first period change, the rotation speed of the motor is controlled to be increased from the initial value V0 to a second value V2 within t 0-t 1, and then the motor is controlled to rotate by taking the second value V2 as the rotation speed within t 1-t 2. And in the period from t2 to t3, the rotating speed of the motor is controlled to be reduced from the second value V2 to the third value V1, and then in the period from t3 to t4, the motor is controlled to rotate by taking the third value V1 as the rotating speed.
In the second periodic variation, the rotation speed of the motor is controlled to be increased from the third value V1 to the fourth value V3 within t 4-t 5, and then the motor is controlled to rotate at the fourth value V3 within t 5-t 6. And in the period from t6 to t7, the rotating speed of the motor is controlled to be reduced from the fourth value V3 to the fifth value V1, and then in the period from t7 to t8, the motor is controlled to rotate by taking the fifth value V1 as the rotating speed.
Finally, in the period from t8 to t9, the rotation speed of the motor is controlled to be increased from the fifth value V1 to the first value V3, and after the rotation speed of the motor reaches the first value V3, the motor is controlled to rotate continuously at the first value V3. In the third example, the working process of the fourth example is described by taking only the first period change and the second period change generated once by the control characteristic variable as an example, and the generation times and the rotation speed values of the first period change and the second period change can be set according to actual needs, which is not limited in the present disclosure.
The power tool may have any one or more of the above modes pre-stored as various options for the first mode of operation, and selected by the switch.
In the above-described pattern examples one, two, three, and four, the time between t0 to t1, the time between t4 to t5 may be greater than 0.1 second, the time between t2 to t3, and the time between t6 to t7 may be greater than 0.3 second. The first value may be greater than 300 revolutions per second and the third value may be less than 200 revolutions per second when it is greater than the initial value. Therefore, the damage to the working surface can be reduced, and the success rate of punching is improved.
In one possible implementation, switching the power tool between the first operating mode and the second operating mode may include any one of: the power tool is switched between a first working mode and a second working mode according to the position of the switch. The power tool is switched between a first working mode and a second working mode according to the pressing times of the selector switch.
In this implementation, the switch may be a rotatable or twistable knob, and the operating mode of the power tool selected by the user is determined by detecting a change in state of the knob upon operation by the user. The operation mode of the power tool selected by the user may be determined according to the rotation direction, angle, number of times, etc. of the knob. For example, if the knob is detected to rotate clockwise from the initial position, the operation mode of the power tool can be switched to the first operation mode; and if the knob is detected to rotate anticlockwise from the initial position, switching the working mode of the power tool to a second working mode. The working mode of the power tool can be switched to the first working mode if the knob is detected to rotate once clockwise or anticlockwise from the initial position; and if the knob is detected to be rotated twice clockwise or anticlockwise from the initial position, switching the working mode of the power tool to a second working mode. The switch may also be a button that can be pressed multiple times, the number of times the button is pressed by the user controlling the switching between the first mode of operation and the second mode of operation. For example, it may be set that if the button is pressed once, the operation mode of the power tool is switched to the first operation mode; if the button is continuously pressed twice, the working mode of the power tool is switched to a second working mode.
It should be understood that, a person skilled in the art may set the switch and the switching manner for switching the operation mode of the power tool between the first operation mode and the second operation mode based on the switch according to actual needs, and the disclosure is not limited thereto. Therefore, the switching process between the working modes can be simplified, convenience is brought to the use of a user, and the time of the user is saved.
It should be noted that, although the control device for a power tool has been described above by taking the above-described embodiment as an example, those skilled in the art will appreciate that the present disclosure should not be limited thereto. In fact, the user can flexibly set the components according to personal preferences and/or actual application scenarios, as long as the technical scheme of the present disclosure is met.
According to the control device and method for the power tool and the power tool, when the power tool is started and works in the first working mode, the control component controls the characteristic variable of the power tool to automatically generate multiple periodic changes according to the preset periodic change rule, so that harmful damage to a working surface caused by the power tool is effectively reduced, and the success rate of operations such as punching on the working surface by the power tool is improved. The process of multiple periodic changes is automatically carried out according to a preset periodic change rule, the influence of a user on the operation of the control switch and the change-over switch is avoided, the working stability of the power tool can be effectively improved, and the working fluctuation of the power tool is reduced.
Fig. 7a is a front view of a power tool shown according to an exemplary embodiment, and fig. 7b is a top view of a power tool shown according to an exemplary embodiment. The power tool may comprise the control means for a power tool described above. As shown in fig. 7a and 7b, the switch 4 of the control device for the power tool is provided at the upper portion of the power tool, and the control switch 3 is provided at the handle of the power tool, which can be operated by the user conveniently.
In the present embodiment, when the user intends to punch a hole in a fragile and explosive work surface such as a tile, the power tool may be switched to the first operation mode by operating the switch 4. After the user places the location of the hole in the tile where the hole is to be punched, the user turns on the control switch 3 to activate the motor of the power tool. The device controls the motor to rotate, for example, in the manner described above for the punching process.
In this embodiment, when a user intends to punch a hole on a conventional non-fragile and non-explosive working surface such as a wall, the control switch 3 may be operated first to switch the power tool to the second working mode, and the characteristic variable of the power tool may be controlled according to the operation amount of the user to realize the punching process.
The power tool provided by the embodiment of the disclosure can work in multiple working modes, and has a wide application range. When the power tool is started and works in the first working mode, the control assembly controls the characteristic variable of the power tool to automatically generate a plurality of periodic changes according to a preset periodic change rule. The process of multiple periodic changes is not influenced by the operation of a user on the control switch and the change-over switch, the working stability of the power tool can be effectively improved, and the working fluctuation of the power tool is reduced. The success rate of operations such as punching on the working surface can be improved, and the harmful damage to the working surface is reduced.
FIG. 8 is a flowchart illustrating a control method for a power tool according to an exemplary embodiment. As shown in fig. 8, the method may include steps S11 through S13.
In step S11, the states of a control switch and a changeover switch of the power tool are determined, wherein the changeover switch switches the power tool between the first operation mode and the second operation mode in accordance with the user operation.
In step S12, in the case where the power tool is in the first operation mode and the control switch is closed, the characteristic variable of the control power tool is cyclically changed a plurality of times according to a preset cyclic change rule.
FIG. 9 is a flowchart illustrating a control method for a power tool according to an exemplary embodiment.
In one possible implementation, as shown in fig. 9, the method may further include step S13 in addition to the above-described step S11 and step S12.
In step S13, the control characteristic variable maintains the first value after the plurality of cyclic changes.
In one possible implementation, step S13 may further include: and controlling the characteristic variable to keep a first value according to a preset keeping rule.
In one possible implementation, the controlling the characteristic variable of the power tool to make a plurality of periodic changes according to a preset periodic change rule may include: at least one first periodic variation of a characteristic variable of the power tool is controlled.
Wherein each first cycle change comprises: rising from an initial value to a second value within a first time; keeping the second value for running for a second time; decreasing from the second value to a third value within a third time; and keeping the third value for running for a fourth time.
In one possible implementation, each first cycle change includes: increasing from an initial value to a second value at a first acceleration within a first time; keeping the second value for running for a second time; decreasing from the second value to a third value at a second acceleration over a third time; and keeping the third value for running for a fourth time.
In one possible implementation, the second value is less than or equal to the first value and the initial value is less than or equal to the third value.
In one possible implementation, controlling the characteristic variable of the power tool to make a plurality of periodic changes according to a preset periodic change rule may further include: after controlling the characteristic variable of the power tool to produce at least one first periodic change, controlling the characteristic variable of the power tool to produce at least one second periodic change.
Wherein, each second period change may include: rising from the third value to a fourth value within a fifth time; keeping the fourth value for running for a sixth time; decreasing from the fourth value to the fifth value within a seventh time; and keeping the fifth value for running for the eighth time.
In one possible implementation, each second period change may include: increasing from the third value to a fourth value at a third acceleration within a fifth time; keeping the fourth value for running for a sixth time; decreasing from the fourth value to a fifth value at a fourth acceleration within a seventh time; and keeping the fifth value for running for the eighth time.
In one possible implementation, the second value is less than or equal to a fourth value that is less than or equal to the first value.
In one possible implementation, the initial value is less than or equal to a third value, which is less than or equal to a fifth value.
FIG. 10 is a flowchart illustrating a control method for a power tool according to an exemplary embodiment.
In one possible implementation, as shown in fig. 10, the method may further include step S14 in addition to the above-described steps S11 to S13.
In step S14, when the power tool is in the second operation mode, the characteristic variable of the power tool is controlled in accordance with the amount of operation of the control switch by the user.
In one possible implementation, switching the power tool between the first operating mode and the second operating mode may include any one of: switching the power tool between a first working mode and a second working mode according to the position of the selector switch; the power tool is switched between a first working mode and a second working mode according to the pressing times of the selector switch.
In one possible implementation, the characteristic variable may comprise a rotational speed of the motor.
In one possible implementation, the characteristic variable may further include a duty ratio, wherein the duty ratio is a proportion of the energization time of the motor to the total energization and deenergization time.
With regard to the method in the above-described embodiment, the detailed manner of each step thereof has been described in detail in the embodiment related to the apparatus, and will not be described in detail herein.
According to the control device and method for the power tool and the power tool, when the power tool is started and works in the first working mode, the control component controls the characteristic variable of the power tool to automatically generate multiple periodic changes according to the preset periodic change rule, so that harmful damage to a working surface caused by the power tool is effectively reduced, and the success rate of operations such as punching on the working surface by the power tool is improved. The process of multiple periodic changes is automatically carried out according to a preset periodic change rule, the influence of a user on the operation of the control switch and the change-over switch is avoided, the working stability of the power tool can be effectively improved, and the working fluctuation of the power tool is reduced.
Having described embodiments of the present disclosure, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terms used herein were chosen in order to best explain the principles of the embodiments, the practical application, or technical improvements to the techniques in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (27)
1. A control device for a power tool including a power source and a motor, the device comprising:
a control switch for disconnecting or connecting the electrical connection between the power source and the motor;
a changeover switch that switches the power tool between a first operation mode and a second operation mode according to a user operation;
a control component connected to the control switch and the transfer switch, respectively, the control component configured to:
when the power tool is in the first working mode and the control switch is closed, controlling the characteristic variable of the power tool to generate a plurality of periodic changes according to a preset periodic change rule;
wherein the control component is further configured to:
controlling the characteristic variable to maintain a first value after the plurality of periodic changes when the power tool is in the first operating mode and the control switch is closed.
2. The apparatus of claim 1, wherein controlling the characteristic variable to maintain a first value comprises:
and controlling the characteristic variable to keep a first value according to a preset keeping rule.
3. The apparatus of claim 1, wherein controlling the characteristic variable of the power tool to make a plurality of periodic changes according to a preset periodic change rule comprises:
controlling a characteristic variable of the power tool to generate at least one first period change, wherein each first period change comprises:
rising from an initial value to a second value within a first time;
maintaining the second value for a second time;
decreasing from the second value to a third value within a third time;
and keeping the third value for running for a fourth time.
4. The apparatus of claim 3, wherein each first periodic variation comprises:
increasing from the initial value to a second value at a first acceleration over a first time;
maintaining the second value for a second time;
decreasing from the second value to a third value at a second acceleration over a third time;
and keeping the third value for running for a fourth time.
5. The apparatus of claim 3 or 4, wherein the second value is less than or equal to the first value, wherein the initial value is less than or equal to the third value,
wherein the characteristic variable retains the first value after the plurality of cyclical variations.
6. The apparatus of claim 3, wherein the characteristic variable controlling the power tool is periodically changed a plurality of times according to a preset periodic change rule, further comprising:
after controlling the characteristic variable of the power tool to generate at least one first periodic change, controlling the characteristic variable of the power tool to generate at least one second periodic change, wherein each second periodic change comprises:
rising from the third value to a fourth value within a fifth time;
maintaining the fourth value for a sixth time;
decreasing from the fourth value to a fifth value within a seventh time;
and keeping the fifth value for running for an eighth time.
7. The apparatus of claim 6, wherein the each second periodic variation comprises:
increasing from the third value to a fourth value at a third acceleration within a fifth time;
maintaining the fourth value for a sixth time;
decreasing from the fourth value to a fifth value at a fourth acceleration within a seventh time;
and keeping the fifth value for running for an eighth time.
8. The apparatus of claim 6 or 7, wherein the second value is less than or equal to the fourth value, wherein the fourth value is less than or equal to the first value,
wherein the characteristic variable retains the first value after the plurality of cyclical variations.
9. The apparatus of claim 6 or 7, wherein the initial value is less than or equal to the third value, and wherein the third value is less than or equal to the fifth value.
10. The apparatus of claim 1, wherein the control component is further configured to:
and when the power tool is in the second working mode, controlling the characteristic variable of the power tool according to the operation amount of the control switch by the user.
11. The apparatus of claim 1, wherein the power tool being switched between the first mode of operation and the second mode of operation comprises either:
switching the power tool between a first working mode and a second working mode according to the position of the switch;
and switching the power tool between a first working mode and a second working mode according to the pressing times of the selector switch.
12. The apparatus of claim 1, wherein the characteristic variable comprises a rotational speed of the motor.
13. The apparatus of claim 12, wherein the characteristic variable further comprises a duty cycle, wherein the duty cycle is a proportion of the time the motor is powered on relative to the total time the motor is powered on and off.
14. A control method for a power tool including a power source and a motor, the method comprising:
judging the states of a control switch and a selector switch of the power tool, wherein the selector switch switches the power tool between a first working mode and a second working mode according to user operation;
when the power tool is in a first working mode and the control switch is closed, controlling the characteristic variable of the power tool to generate a plurality of periodic changes according to a preset periodic change rule;
wherein the method further comprises:
controlling the characteristic variable to maintain a first value after the plurality of periodic changes.
15. The method of claim 14, wherein controlling the characteristic variable to maintain a first value comprises:
and controlling the characteristic variable to keep a first value according to a preset keeping rule.
16. The method of claim 14, wherein controlling the characteristic variable of the power tool to make a plurality of periodic changes according to a preset periodic change rule comprises:
controlling a characteristic variable of the power tool to generate at least one first period change, wherein each first period change comprises:
rising from an initial value to a second value within a first time;
maintaining the second value for a second time;
decreasing from the second value to a third value within a third time;
and keeping the third value for running for a fourth time.
17. The method of claim 16, wherein each first periodic variation comprises:
increasing from the initial value to a second value at a first acceleration over a first time;
maintaining the second value for a second time;
decreasing from the second value to a third value at a second acceleration over a third time;
and keeping the third value for running for a fourth time.
18. The method of claim 16 or 17, wherein the second value is less than or equal to the first value, wherein the initial value is less than or equal to the third value,
wherein the characteristic variable retains the first value after the plurality of cyclical variations.
19. The method of claim 16, wherein controlling the characteristic variable of the power tool to make a plurality of periodic changes according to a preset periodic change rule further comprises:
after controlling the characteristic variable of the power tool to generate at least one first periodic change, controlling the characteristic variable of the power tool to generate at least one second periodic change, wherein each second periodic change comprises:
rising from the third value to a fourth value within a fifth time;
maintaining the fourth value for a sixth time;
decreasing from the fourth value to a fifth value within a seventh time;
and keeping the fifth value for running for an eighth time.
20. The method of claim 19, wherein each second periodic variation comprises:
increasing from the third value to a fourth value at a third acceleration within a fifth time;
maintaining the fourth value for a sixth time;
decreasing from the fourth value to a fifth value at a fourth acceleration within a seventh time;
and keeping the fifth value for running for an eighth time.
21. The method of claim 19 or 20, wherein the second value is less than or equal to the fourth value, wherein the fourth value is less than or equal to the first value,
wherein the characteristic variable retains the first value after the plurality of cyclical variations.
22. The method of claim 19 or 20, wherein the initial value is less than or equal to the third value, and wherein the third value is less than or equal to the fifth value.
23. The method of claim 14, further comprising:
and when the power tool is in the second working mode and the control switch is closed, controlling the characteristic variable of the power tool according to the operation amount of the control switch by a user.
24. The method of claim 14, wherein switching the power tool between the first mode of operation and the second mode of operation comprises any one of:
switching the power tool between a first working mode and a second working mode according to the position of the switch;
and switching the power tool between a first working mode and a second working mode according to the pressing times of the selector switch.
25. The method of claim 14, wherein the characteristic variable comprises a rotational speed of the motor.
26. The method of claim 25, wherein the characteristic variable further comprises a duty cycle, wherein the duty cycle is a proportion of the time the motor is energized relative to the total time the motor is energized and de-energized.
27. A power tool, characterized in that the power tool comprises: a control device according to any one of claims 1 to 13.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710919435.XA CN109590949B (en) | 2017-09-30 | 2017-09-30 | Control device and method for power tool and power tool |
| PCT/CN2018/108843 WO2019062990A1 (en) | 2017-09-30 | 2018-09-29 | Electric tool and control device thereof |
| CN201880061417.5A CN111491762B (en) | 2017-09-30 | 2018-09-29 | Electric tool and control device thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710919435.XA CN109590949B (en) | 2017-09-30 | 2017-09-30 | Control device and method for power tool and power tool |
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| CN109590949A CN109590949A (en) | 2019-04-09 |
| CN109590949B true CN109590949B (en) | 2021-06-11 |
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| CN201710919435.XA Active CN109590949B (en) | 2017-09-30 | 2017-09-30 | Control device and method for power tool and power tool |
| CN201880061417.5A Active CN111491762B (en) | 2017-09-30 | 2018-09-29 | Electric tool and control device thereof |
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| WO2021196581A1 (en) * | 2020-03-31 | 2021-10-07 | 苏州宝时得电动工具有限公司 | Control system for electrical control pack |
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| US5531278A (en) * | 1995-07-07 | 1996-07-02 | Lin; Pi-Chu | Power drill with drill bit unit capable of providing intermittent axial impact |
| DE10316844A1 (en) * | 2003-04-11 | 2004-11-04 | Hilti Ag | Control of an electric hand machine tool |
| JP4061595B2 (en) * | 2004-03-05 | 2008-03-19 | 日立工機株式会社 | Vibration drill |
| JP5403328B2 (en) * | 2009-02-02 | 2014-01-29 | 日立工機株式会社 | Electric drilling tool |
| JP5440766B2 (en) * | 2009-07-29 | 2014-03-12 | 日立工機株式会社 | Impact tools |
| JP5547004B2 (en) * | 2010-09-07 | 2014-07-09 | 瓜生製作株式会社 | Stroke torque adjusting device for hydraulic torque wrench |
| JP5813437B2 (en) * | 2011-09-26 | 2015-11-17 | 株式会社マキタ | Electric tool |
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| DE102012209446A1 (en) * | 2012-06-05 | 2013-12-05 | Robert Bosch Gmbh | Hand machine tool device |
| JP6337728B2 (en) * | 2014-09-30 | 2018-06-06 | 日立工機株式会社 | Working machine |
| JP6755152B2 (en) * | 2015-11-06 | 2020-09-16 | 株式会社マキタ | Electric work machine |
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| EP0724935A2 (en) * | 1995-02-03 | 1996-08-07 | Robert Bosch Gmbh | Impact wrench and procedure for tightning a fastener connection therewith |
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| CN111491762A (en) | 2020-08-04 |
| WO2019062990A1 (en) | 2019-04-04 |
| CN111491762B (en) | 2023-08-11 |
| CN109590949A (en) | 2019-04-09 |
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Denomination of invention: Control device and method for power tools, and power tools Effective date of registration: 20230613 Granted publication date: 20210611 Pledgee: China Minsheng Bank Co.,Ltd. Zhangjiagang Sub branch Pledgor: POSITEC POWER TOOLS (SUZHOU) Co.,Ltd. Registration number: Y2023980043393 |
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