WO2019062990A1

WO2019062990A1 - Electric tool and control device thereof

Info

Publication number: WO2019062990A1
Application number: PCT/CN2018/108843
Authority: WO
Inventors: 孙井龙; 朱伯元; 毋宏兵; 张传兵; 朱行
Original assignee: 苏州宝时得电动工具有限公司
Priority date: 2017-09-30
Filing date: 2018-09-29
Publication date: 2019-04-04
Also published as: CN109590949B; CN111491762B; CN111491762A; CN109590949A

Abstract

An electric tool comprises a motor (1), an output shaft (2), a motion conversion mechanism, a control switch (30), a control assembly (50). The output shaft is in matching connection with a working head (21). The motion conversion mechanism is connected to the motor and the output shaft, and can convert rotary motions of the motor into axial impacts and transmits the axial impacts to the working head. The control switch is used for switching off or on an electrical connection between a power source (10) and the motor. The control mechanism (50) comprises a controller (51) and an electronic switch (52). The electronic switch is located between the motor and the controller. The controller controls ON and OFF of the electronic switch to intermittently control a characteristic variable reflecting the working state of the motor, so that the working head of the electric tool performs intermittent impacts, the effects of the intermittent impacts are same as effects obtained when operations for switching on or off the control switch are repeatedly performed, and power supply to the motor is intermittently changed. The intermittent impacts of the working head of the electric tool effectively reduces harmful loss imposed by the electric tool on surfaces of ceramic tiles, and accordingly, the situation of break of ceramic tiles due to the effect of continuous acting force on the ceramic tile during hole drilling is avoided. The present invention also relates to a control device for the electric tool.

Description

Power tool and its control device

Technical field

The invention relates to the technical field of power tools, and in particular to a power tool and a control device thereof.

Background technique

At present, the user can perform drilling work on the working surface of materials such as ceramic tiles and cement with the aid of electric tools such as electric drills. However, when drilling holes in ceramic tiles (glazed tiles, vitrified tiles, etc.), the existing AC drill must be combined with a hole opener or a glass drill to open holes in tiles (glazed tiles, vitrified tiles, etc.). The price of the hole opener or the glass drill is relatively high, and a hole opener or a glass drill can only punch about 5 holes. The average cost per hole is higher, and the batch head needs to be frequently replaced when punching. Cumbersome.

It is an urgent problem to be solved by the present invention how to provide a power tool that can punch holes in a tile without the need of a hole punch or a glass drill, and the tile is not easily broken.

Summary of the invention

In order to overcome the deficiencies of the prior art, the problem to be solved by the present invention is to provide a power tool that can be opened in a tile without the attachment of the accessory and the tile is not broken.

The technical solution adopted by the present invention to solve the prior art problem is:

A power tool comprising:

motor;

Output shaft, mated with the working head;

a motion conversion mechanism connecting the motor and the output shaft to convert the rotational motion of the motor into an axial impact transmission to the working head;

Controlling a switch for disconnecting or turning on an electrical connection between the power source and the motor;

a control assembly comprising a controller and an electronic switch, the electronic switch being located between the motor and the controller, the controller controlling the switching of the electronic switch to intermittently control a characteristic variable reflecting the operating state of the motor, such that The head of the electric power tool is intermittently impacted, and the intermittent impact is the same as that in the case where the opening and closing operations of the control switch are repeated, and the power supply of the motor is intermittently changed.

Preferably, the control component performs intermittent control on the characteristic variables reflecting the working state of the motor, and then performs continuous control.

Preferably, the method further includes:

a switching device, the switching device is connected to the control component, the switching device generates a control signal to the control component according to a user operation, and the control component controls the power tool in a first working mode and a second working mode Switch between

Wherein, when the power tool is in the first working mode, the control component intermittently controls a characteristic variable reflecting the working state of the motor; when the power tool is in the second working mode, the control component reflects The characteristic variables of the operating state of the motor are continuously controlled.

Preferably, the power tool has a single impact energy of 1.6 joules or more and less than or equal to 3 joules, and the control component intermittently controls the characteristic variable reflecting the working state of the motor such that the impact frequency of the working head is greater than 2000 times. / sec, less than 4800 times / sec, when the single impact energy is 1.6 joules, the control component changes the characteristic variable reflecting the working state of the motor according to the first period, wherein the first period is greater than or equal to 0.1 second, less than or equal to 2 seconds, when the single impact energy is 3 joules, the control component changes the characteristic variable reflecting the working state of the motor according to the second period, wherein the second period is greater than or equal to 0.1 seconds and less than or equal to 1.5 seconds.

Preferably, when the stroke amount of the control switch reaches a preset value, the control component switches from intermittent control to continuous control to a characteristic variable reflecting the working state of the motor.

Preferably, after the control switch is closed for a preset time, the control component switches from intermittent control to continuous control to a characteristic variable reflecting the working state of the motor.

Preferably, the control component performs intermittent control on a characteristic variable reflecting the working state of the motor, including:

The control component controls a characteristic variable reflecting the operating state of the motor to generate a plurality of pulses according to a preset periodic variation rule.

Preferably, among the plurality of pulses, the amplitude of the latter pulse is greater than or equal to the amplitude of the previous pulse.

Preferably, the amplitudes of the plurality of pulses are gradually increased by a preset value.

Preferably, after the plurality of pulses, the control component controls the characteristic variable reflecting the operating state of the motor to maintain the first value, wherein the first value is greater than or equal to the amplitude of the last pulse.

Preferably, the waveform of a single pulse comprises:

Increase from the initial value to the second value in the first time;

Maintaining the second value for a second time;

Decreasing from the second value to a third value in a third time;

Keeping the third value running for a fourth time.

Preferably, the rate at which the single pulse rises from the initial value to the second value is different from the rate of decrease from the second value to the third value.

Preferably, the plurality of pulses rise at different rates.

Preferably, 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.

Preferably, when the electric hammer is in the second working mode, the control component continuously controls the characteristic variable reflecting the working state of the motor according to the operation amount of the control switch by the user.

Preferably, the electric hammer further comprises a function conversion button for realizing switching of four functions of drilling, hammer drilling, adjustment and hammer.

Preferably, the characteristic variable reflecting the operating state of the motor comprises the rotational speed of the motor.

Preferably, the characteristic variable reflecting the operating state of the motor includes a duty ratio which is a ratio of the energization time of the motor to the total on/off time.

In another aspect of the present invention, a control device for a power tool is provided, the power tool including a motor, an output shaft coupled to the working head, and a motion conversion mechanism, the motion conversion mechanism connecting the motor and the output shaft, The utility model converts the rotary motion of the motor into an axial impact transmission to the working head, and the control device comprises:

Preferably, the method further includes:

In another aspect of the invention, there is also provided a control apparatus for a power tool, the power tool comprising a power source and a motor, the apparatus comprising:

Switching device, switching the power tool between the first working mode and the second working mode according to a user operation;

Control components are respectively connected to the control switch and the switching device, the control component being configured to:

When the power tool is in the first working mode and the control switch is closed, the characteristic variable that controls the working state of the motor generates a plurality of periodic changes according to a preset period change rule.

In a possible implementation manner, the control component is further configured to:

When the power tool is in the first mode of operation and the control switch is closed, the characteristic variable is controlled to maintain a first value after the plurality of periodic changes.

For a device as described above, in a possible implementation, controlling the feature variable to maintain the first value includes:

The feature variable is controlled to maintain the first value according to a preset retention rule.

For the above device, in a possible implementation manner, the characteristic variable that controls the working state of the motor generates a plurality of periodic changes according to a preset periodic change rule, including:

A characteristic variable that controls an operating state of the motor produces at least one first period change, wherein each first period change comprises:

Increase from the initial value to the second value in the first time;

Maintaining the second value for a second time;

Decreasing from the second value to a third value in a third time;

Keeping the third value running for a fourth time.

In a possible implementation manner, the first time period change includes:

Raising from the initial value to the second value from the initial value in a first time;

Maintaining the second value for a second time;

Decreasing from the second value to the third value at a second acceleration in a third time;

Keeping the third value running for a fourth time.

In a possible implementation manner, 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,

Wherein, after the plurality of periodic changes, the characteristic variable maintains the first value.

For the above device, in a possible implementation, the characteristic variable that controls the working state of the motor generates a plurality of periodic changes according to a preset periodic change rule, and further includes:

After the characteristic variable controlling the operating state of the motor generates at least one first period change, the characteristic variable controlling the operating state of the motor generates at least one second period change, wherein each second period change comprises:

Increase from the third value to the fourth value in the fifth time;

Maintaining the fourth value for a sixth time;

Decreasing from the fourth value to the fifth value in the seventh time;

Keep the fifth value running for the eighth time.

In a possible implementation manner, the second periodic change includes:

Raising from the third value to the fourth value from the third value in the fifth time;

Maintaining the fourth value for a sixth time;

Decreasing from the fourth value to the fifth value from the fourth value in the seventh time;

Keep the fifth value running for the eighth time.

In a possible implementation manner, the second value is less than or equal to the fourth value, and the fourth value is less than or equal to the first value,

In a possible implementation manner, 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.

When the power tool is in the second working mode, and the control switch is closed, the characteristic variable of the working state of the motor is controlled according to the operation amount of the control switch by the user.

For the above device, in a possible implementation manner, the switching between the first working mode and the second working mode of the power tool includes any one of the following modes:

Switching the power tool between the first working mode and the second working mode according to the position of the switching device;

The power tool is switched between the first operating mode and the second operating mode according to the number of presses of the switching device.

In a possible implementation of the above apparatus, the characteristic variable includes a rotational speed of the motor.

In a possible implementation manner, the characteristic variable further includes a duty ratio, wherein the duty ratio is a ratio of an energization time of the motor to a total on/off time.

According to another aspect of the present invention, there is provided a control method for a power tool including a power source and a motor, the method comprising:

Determining a state of a control switch of the power tool and a switching device, wherein the switching device switches the power tool between the first working mode and the second working mode according to a user operation;

For the above method, in a possible implementation manner, the method further includes:

The characteristic variable is controlled to maintain a first value after the plurality of periodic changes.

For the above method, in a possible implementation, controlling the feature variable to maintain the first value includes:

For the above method, in a possible implementation manner, the characteristic variable that controls the working state of the motor generates a plurality of periodic changes according to a preset periodic change rule, including:

Increase from the initial value to the second value in the first time;

Maintaining the second value for a second time;

Decreasing from the second value to a third value in a third time;

Keeping the third value running for a fourth time.

For the above method, in a possible implementation manner, the first change of the first period includes:

Maintaining the second value for a second time;

Keeping the third value running for a fourth time.

For the above method, in a possible implementation, the characteristic variable that controls the working state of the motor generates a plurality of periodic changes according to a preset periodic change rule, and further includes:

Increase from the third value to the fourth value in the fifth time;

Maintaining the fourth value for a sixth time;

Decreasing from the fourth value to the fifth value in the seventh time;

Keep the fifth value running for the eighth time.

For the above method, in a possible implementation manner, the second period change includes:

Maintaining the fourth value for a sixth time;

Keep the fifth value running for the eighth time.

In a possible implementation manner, the method further includes:

In the second working mode of the power tool, a characteristic variable of an operating state of the motor is controlled according to an operation amount of the control switch by a user.

For the above method, in a possible implementation, the switching between the first working mode and the second working mode of the power tool includes any one of the following modes:

For the above method, in one possible implementation, the characteristic variable includes the rotational speed of the motor.

According to another aspect of the present invention, there is provided a power tool comprising: the control device for a power tool according to the above.

Compared with the prior art, the utility model has the beneficial effects that the power tool provided by the embodiment of the invention includes a motion conversion mechanism, which can convert the rotary motion of the motor into an axial impact transmission to the working head, and the controller controls the electronic switch. The on-off control intermittently controls the characteristic variables reflecting the working state of the motor, so that the working head of the power tool intermittently impacts, thereby effectively reducing the harmful loss of the power tool to the tile surface, and avoiding the continuous impact during the drilling process. The force acts on the tile, causing the tile to rupture. At the same time, it does not need to be combined with other accessories such as the hole opener, which saves the cost.

DRAWINGS

The accompanying drawings, which are incorporated in FIG

1a is a schematic structural view showing a control circuit of a power tool according to an embodiment of the present invention;

1b is a schematic view showing the specific structure of a control circuit of a power tool according to an embodiment of the present invention;

2 is a waveform diagram showing an example 1 of the first mode of the present invention;

Figure 3 is a waveform diagram showing an example 2 of the first mode of the present invention;

Figure 4 is a waveform diagram showing a second mode of operation of the present invention;

Figure 5 is a waveform diagram showing an example 3 of the first mode between the inventions;

Figure 6 is a waveform diagram showing an example 4 of the first mode of the present invention;

Figure 7 is a waveform diagram showing an example 5 of the first mode of the present invention;

Figure 8 is a waveform diagram showing an example six of the first mode of the present invention;

9 is a schematic structural view of a power tool according to the present invention;

Figure 10a is a front elevational view of a power tool of the present invention;

Figure 10b is a top plan view of a power tool of the present invention;

Figure 10c is a front elevational view of another power tool of the present invention;

Figure 11 is a flow chart of a control method for a power tool of the present invention;

Figure 12 is a flow chart of a control method for a power tool of the present invention;

Figure 13 is a flow chart of a control method for a power tool of the present invention;

Figure 14 is a flow chart of a control method for a power tool of the present invention.

Detailed ways

Various exemplary embodiments, features, and aspects of the invention are described in detail below with reference to the drawings. The same reference numerals in the drawings denote the same or similar elements. Although the various aspects of the embodiments are illustrated in the drawings, the drawings are not necessarily drawn to scale unless otherwise indicated.

The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustrative." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or preferred.

In addition, numerous specific details are set forth in the Detailed Description of the invention in the Detailed Description. Those skilled in the art will appreciate that the invention may be practiced without some specific details. In some instances, methods, means, components, and circuits that are well known to those skilled in the art are not described in detail in order to facilitate the invention.

A power tool according to the present invention includes a motor, an output shaft coupled to the working head, a motion converting mechanism, a control switch and a control assembly, wherein the motion converting mechanism is used to connect the motor and the output shaft to convert the rotational motion of the motor into a shaft The impact force is transmitted to the working head. The control component includes a controller and an electronic switch. The electronic switch is located between the motor and the controller. The controller controls the on/off of the electronic switch to intermittently control the characteristic variables reflecting the working state of the motor, so that the electric motor The head of the tool is intermittently impacted, and the intermittent impact is the same as the control for intermittently changing the power supply of the motor, similarly to the case where the opening and closing operations of the control switch are repeated. Among them, the opening of the control switch means that the power source and the motor are not connected, the power of the power source cannot be transmitted to the motor, and the closing of the control switch refers to the connection of the power source and the motor, and the power of the power source can be transmitted to the motor and the motor is operated.

According to the power tool provided by the present invention, the controller controls the on/off of the electronic switch to intermittently control the characteristic variables reflecting the working state of the motor, so that the working head of the power tool realizes intermittent impact, thereby effectively reducing the pair of power tools. The harmful loss of the tile surface avoids the continuous impact force on the tile during the drilling process, which causes the tile to rupture. At the same time, it does not need to be combined with other accessories such as the hole opener, which saves the cost.

The existing electric drill can perform the punching operation on the working surface. The electric drill punching mainly causes the working surface to have a correspondingly sized hole by the rotation of the drill bit and the working surface, and the smaller the rotating speed of the electric drill, the longer the friction is out of one hole. Therefore, in order to complete the drilling operation on the working surface, there is a certain requirement for the rotation speed of the electric drill, for example, the rotation speed of the electric drill must reach 2000 rev / sec. The electric power tool of the present invention converts the rotational motion of the motor into an axial impact of the output shaft by the motion conversion mechanism, and strikes the working surface by the axial impact force of the output shaft, thereby striking the working surface into a desired hole. The invention converts the rotary friction of the drill bit into a drilling force to impact the working surface, completes the drilling, and has a turning point in solving the problem. At the same time, if the rotary motion is converted into an axial impact alone, the power tool can be opened when the surface of the tile (glazed tile, vitrified tile, etc.) is opened, but the impact of the power tool on the tile is high (the impact frequency is high) ), there will be new problems with tile damage. In order to solve the new problem, the invention adopts intermittent control on the characteristic variables reflecting the working state of the motor, so that the power tool intermittently appears between the low frequency impacts at high frequency impact, so that the impact on the tile surface such as vitrified bricks is caused. The force is buffered during intermittent changes, reducing or even avoiding harmful damage to the work surface. This allows the power tool to perforate the surface of the tile so that the tile does not break.

In one embodiment of the invention, the control component controls the characteristic variables that reflect the operating state of the motor intermittently and then performs continuous control. The specific performance is that the working head of the power tool has a continuous impact after intermittent impact, and the electric tool can be a hammer or a hammer drill. During the intermittent control of the characteristic variables reflecting the working state of the motor by the control component, the impact force applied to the working surface is buffered, and the tile surface is not easily broken. When the power tool is drilled to a certain depth and needs to continue punching on another material, if intermittent control is still used, although the punching operation can be continued, the overall efficiency of the tool becomes low, and this embodiment solves the problem. When the hole is continuously punched on another material, the control component intermittently controls the characteristic variables reflecting the working state of the motor, so that the surface of the tile (glazed tile, vitrified tile, etc.) is not broken, and the work efficiency is improved. .

The above embodiments are described in detail below, and the power tool of the present invention can be used for drilling work on a work surface having different materials. For different materials, the power of the power tool that the material can withstand is different. When the power tool of the present invention is operated on a working surface having two different materials, different forces can be selected according to different materials. For example, when the power tool is used for processing a wall surface, the wall surface has a first material located on the surface layer and a second material located below the surface layer, and the present invention is different in the magnitude of the force that the two different materials can withstand during operation. According to this feature, when the power tool is operated with the first material of the surface layer with less ability, the control component intermittently controls the characteristic variables reflecting the working state of the motor, so that the average force is small, and the first material of the surface layer is prevented. The surface is broken. When working with the second material with large capacity, the control component continuously controls the characteristic variables reflecting the working state of the motor to provide a large force. The second material will not break and can achieve fast operation. . The batch head of the power tool of the invention can process different materials without replacing the batch head, thereby saving cost and improving efficiency.

In another embodiment of the present invention, please refer to FIG. 1a, which is a schematic structural diagram of a control circuit of the power tool of the present invention. The control circuit of the power tool includes a power source 10, a motor 1, a control switch 30 and a control unit 50 for opening or closing an electrical connection between the external power source 10 and the motor 1, in the above embodiment, intermittent The control and continuous control are switched based on the amount of stroke of the control switch 30 reaching a preset value. Specifically, the control switch 30 may be a trigger switch, and the intermittent control and the continuous control are switched based on the operation amount of the trigger switch. When the power tool processes the first material, the control component 50 intermittently records the characteristic variable reflecting the working state of the motor. Controlling, causing the working head of the power tool to intermittently impact, when approaching or reaching the second material or when the user needs continuous impact, the amount of stroke of the user pulling the control switch 30 is increased until the preset value is reached, and the control assembly 50 reflects the motor The characteristic variable of the working state is switched from intermittent control to continuous control, and the working head of the power tool is switched from intermittent impact to continuous impact, and the power tool operates with a large force. For example, when the amount of pulling operation of the control switch 30 of the electric power tool is Lmv (for example, 4000 mv) or less, the electric power tool performs intermittent control, and the tool periodically performs power supply and power supply stop, when the amount of actuation of the switch 30 is controlled. When the Lmv is exceeded, the power tool is continuously controlled.

Due to the different intermittent control time required by different materials, when different users use electric tools, the time to reach the interface between the first material and the second material may be different, or in a certain operation, only intermittent control is required. In this case, the intermittent impact and the continuous impact are switched by manually controlling the amount of pulling operation of the switch 30, which may be different according to the material of the working surface, the user's demand, or the user's operating force. Real-time observation of the adjustment of the intermittent impact time, making the intermittent impact and continuous impact switching more accurate.

In the above embodiment, an example in which the characteristic variable intermittent control and the continuous control reflecting the operating state of the motor are switched based on the amount of the pulling operation of the control switch 30 so that the intermittent impact and the continuous impact of the working head of the electric power tool are switched are shown. However, the present invention can also intermittently control the characteristic variables within a predetermined time TM from the time T0 at which the control switch 30 is turned on, irrespective of the amount of the pulling operation of the control switch 30, after the lapse of the predetermined time TM , continuous control of the feature variables. By controlling the time when the switch 30 is turned on, the intermittent control and the continuous control are switched, and the automaticness is higher and the operation is more convenient.

Further, in addition to the above-described intermittent control and continuous control according to the amount of the pulling operation of the control switch 30 and the time when the control switch 30 is turned on, it is also possible to switch the intermittent control based on the operating current of the motor 1 and the function of the rotational speed. Continuous control.

In the present embodiment, the characteristic variables reflecting the operating state of the motor may include parameters such as the rotational speed, duty ratio, and the like of the motor 1. The present invention is not limited thereto, in which the duty ratio is increased, the rotational speed of the motor 2 is increased, and the single impact energy of the power tool on the working surface is also increased.

In another embodiment of the present invention, please refer to FIG. 1b for a detailed structural diagram of a control circuit of the power tool of the present invention. The power tool further includes a switching device 40 connected to the control component 50. The control component 50 includes a controller 51 and an electronic switch 52. The switching device 40 generates a control signal according to a user operation and transmits it to the controller 51 in the control component 50. The first control mode 511 or the second control mode 512 is selected according to the control signal to control the electronic switch 52 such that the power tool is respectively in the first working mode or the second working mode; wherein, when the power tool is in the first working mode, The controller 51 intermittently controls the characteristic variable reflecting the working state of the motor through the first control mode 511, so that the working head of the power tool intermittently impacts; when the power tool is in the second working mode, the controller 51 clears the second control mode 512 pairs of characteristic variables reflecting the working state of the motor are continuously controlled, so that the working head of the power tool continuously impacts.

The power tool of the above embodiment has a first working mode and a second working mode. When the power tool is operated on a fragile and explosive working surface of a ceramic tile such as a common glazed tile or a vitrified tile, the switching device 4 switches to the first work. The mode, the control component 50 intermittently controls the duty variables such as the duty ratio and the rotational speed of the impact tool, and the intermittent impact of the working head of the power tool causes the impact force acting on the surface of the tile such as the vitrified tile to be buffered during the intermittent impact process. Reduce or even avoid harmful damage to the work surface. In a preferred embodiment, when the switching device 4 is switched to the first working mode, the control component 50 performs intermittent control on the duty variables such as the duty ratio and the rotational speed of the impact tool, and then performs continuous control, wherein the control can be controlled. The trigger operation amount of the switch 30 switches between the intermittent control and the continuous control, and the characteristic variable is switched from the intermittent control to the continuous control when the time when the control switch 30 is turned off reaches a preset value. When the power tool is working on other working surfaces, the switching device 4 switches to the second working mode, and the control unit 50 continuously controls the characteristic variables reflecting the working state of the motor, so that the working head continuously impacts to improve work efficiency. The electric tool of the invention can work on different working surfaces, and when different working surfaces are switched, only mode selection is needed, and the batch head is not needed, which improves work efficiency and saves cost.

In the present invention, the total energy of the power tool to perform a single punching operation is equal to the product of the single impact energy and the impact frequency. As the single impact energy becomes larger, the corresponding impact frequency is appropriately reduced, so that the total energy for completing a single operation satisfies the first predetermined range or equal to a fixed value. For example, for different power tools, the total energy for completing a single job is different, and for a certain type of power tool, the total energy for completing a single job is fixed.

How the present invention determines a suitable single impact energy is a technical problem that needs to be solved. The single impact energy is too large, which will reduce the friction between the power tool and the working surface, causing the power tool to slip on the surface of the tile. If the single impact energy is too large, the tile surface will be broken immediately. Meet the operational requirements. The technical personnel of the present invention have conducted many tests, and summarized the test results, and found that the magnitude of the single impact energy needs to satisfy the second preset range. In the present invention, the second preset range is that the single impact energy is greater than or equal to the first pre-predetermined range. The value is set to be less than or equal to the second preset value, wherein the first preset value is 1.6 joules and the second preset value is 3 joules. Among them, for 2Kg electric hammer or impact drill with standard aperture of 18mm, the single impact energy should be greater than or equal to 1.8 joules, less than or equal to 3 joules. For 1.5Kg electric hammer or impact drill with standard aperture of 18mm, the single impact energy should be greater than Equal to 1.6 joules, less than or equal to 3 joules. When the single impact energy is less than 1.6 joules, at this time, the impact force of the power tool is small, and it is not possible to drill or drill holes on the working surface for a long time. If the characteristic variables are intermittent variables, The drilling time is longer and does not meet the operation requirements. When the single impact energy is more than 3 joules, the excessive impact force will cause the tool to crack the surface of the tile such as the vitrified tile in one impact, and it does not meet the operation requirements. According to the invention, according to a plurality of tests, for a 2Kg electric hammer or impact drill with a standard aperture of 18 mm, when the single impact energy is between 1.8 joules and 2 joules, the impact frequency should be greater than 2000 times/second, less than 4800 times/ Secondly, the power tool can ensure that when the surface of the tile such as vitrified brick is drilled, the tile is not broken, and the high punching efficiency can be ensured, and the overall working efficiency is the highest. In this embodiment, in order to ensure that the punching on the tile is not broken, the power tool impacts the t1 time with a single impact energy of 1.8-2 joules, and then reduces the impact frequency impact t2 time after the impact frequency of 4800 times/second. Impact can reduce the impact of the tile surface and prevent the tile from rupturing. For example, after impacting at a shock frequency of 4,800 times/second for 0.1 second, then impacting at an impact frequency of 2,500 times/second for 0.8 seconds, and then impacting at an impact frequency of 4,800 times/second for 0.1 second, sequentially circulating, so that the tile surface is subjected to continuous impact force. Reduce so that the tiles do not break. When the single impact energy is equal to 3 joules, the impact frequency is greater than 2000 times/second, the impact frequency is less than 4800 times/second, and the impact time is relatively reduced, for example, the impact frequency of 4800 times/second is impacted for 2 milliseconds and then smaller. The impact frequency is, for example, 2000 times/second impact for 1 second. Preferably, for a power tool with a single impact energy of 1.8-2 joules, the maximum impact frequency is 4000-4200 times/second, and the user controls the maximum impact frequency duration according to actual needs to ensure that the tile surface is not broken, and may have Larger work efficiency. For a power tool with a single impact energy equal to 3 joules, the maximum impact frequency is 4000-4200 times/second, and the maximum impact frequency duration is small, which may be 1-2 milliseconds. The invention is not limited herein, as long as it can be guaranteed The tiles do not break.

The single impact energy of the power tool is greater than or equal to 1.6 joules and less than or equal to 3 joules, and the control component intermittently controls the characteristic variable reflecting the working state of the motor such that the impact frequency of the working head is greater than 2000 times/second. When the single impact energy is 1.6 joules, the control component changes the characteristic variable reflecting the working state of the motor according to the first period, wherein the first period is greater than or equal to 0.1 second and less than or equal to 2 seconds. That is, the single impact energy is 1.6 joules, and the impact frequency of the working head is 2000 times/second. After the impact is 0.1-2 seconds, the power tool stops the impact, and after the impact for 0.1-2 seconds, the power tool stops the impact, and so on. When the impact frequency is in the range of 2000-4800 times/second, after the impact is 0.1-2 seconds, the power tool stops the impact and then the impact is 0.1-2 seconds, and the power tool stops the impact. When the single impact energy is 3 joules, the impact frequency of the working head is 2000 times/second. After the impact is 0.1-1.5 seconds, the power tool stops the impact, and after the impact for 0.1-1.5 seconds, the power tool stops the impact, and so on. When the impact frequency is in the range of 2000-4800 times/second, after the impact is 0.1-1.5 seconds, the power tool stops the impact and then strikes for 0.1-1.5 seconds, and the power tool stops the impact. Among them, when the single pulse time of the power tool is between 1.6-3 joules, the impact frequency is in the range of 2000-4800 times/second, and the power tool stops the impact after the power tool impacts 0.1-2 seconds, and then the impact is 0.1-2. After the second, the power tool stops the impact and repeats.

The single impact energy of the power tool of the invention is within a second preset range, so that the characteristic variable of the working state of the motor can be changed intermittently, the tool has sufficient impact force to perform the drilling operation, and the impact force can be avoided. Large, the tile surface is broken, and the tool has a higher punching efficiency.

In the above embodiment, the magnitude of the single impact energy can be measured by the stress wave method. When the power tool hits the working surface, a stress wave (stress pulse) is generated in the tool and is transmitted to the end of the chisel along the direction of the power tool. This stress pulse can be recorded with an appropriate instrument. The stress pulse carries a portion of the impact energy of the impact mechanism, and the maximum stress is a function of the end-impact velocity (ie, the impact energy) at the time of the impact operation. The relationship between the impact energy and the maximum stress can be determined by appropriate marking. The specific detection method can refer to the method of measuring the impact energy by the stress wave method in the performance test method of the rock drilling machine and the pneumatic tool in the national standard, and will not be detailed here. The measurement of the impact frequency can be performed using a signal that clearly indicates the number of impacts of the product under test, such as the motion of the power tool, the stress pulse, and the motion signal. For example, a stress pulse computer measurement method or a magnetoelectric sensor method or a pressure sensor or a high speed camera can be used to perform measurement while the power tool is operating normally.

The above embodiment controls the intermittent variation of the characteristic variables of the power tool by controlling the magnitude of the single impact energy of the power tool and the magnitude of the impact frequency, so that the power tool can be operated on different working surfaces (tiles, vitrified tiles, etc.). It can ensure that the surface of tiles, vitrified tiles and the like are not broken, and it can prevent the single impact energy from being too low and the work efficiency is too low.

The intermittent control of the characteristic variables of the present invention includes intermittently controlling the characteristic variables in a pulsed manner. During the intermittent control process, the control component 50 controls the characteristic variable reflecting the working state of the motor to generate a plurality of pulses according to a preset periodic variation rule, that is, the frequency and amplitude of the pulse during the intermittent control are preset, and the control switch 30 is moved. The amount of motion is irrelevant. In one embodiment of the present invention, the amplitude of the latter pulse is greater than or equal to the amplitude of the previous pulse, that is, the amplitude of the plurality of pulses is gradually increased as a whole, and the amplitude of the plurality of pulses is gradually increased according to a preset value, and the present invention is gradually increased. The increase can be the same or different.

Specifically, FIG. 2 is a waveform diagram showing an example 1 of the first mode of the present invention. The characteristic variables of this embodiment include, but are not limited to, duty cycle, rotational speed. As shown in Fig. 2, the amplitude of the plurality of pulses is gradually increased, the pulse amplitude of the first pulse is D1, the pulse amplitude of the second pulse is D2, the pulse amplitude of the third pulse is D3, and the pulse amplitude of the fourth pulse is D4. . . . . . . Among them, D4>D3>D2>D1. When the power tool starts working, the amplitude of the pulse increases slowly, and the subsequent growth is faster, that is, D4-D3>D3-D2>D2-D1. Of course, the amplitude of the plurality of pulses can also be increased at a steady rate, for example, D4-D3=D3-D2=D2-D1, which is not limited in the present invention. In this embodiment, the rate of each pulse rise and the rate of decrease may be adjusted according to actual conditions, and the rate of rise may be equal to the rate of decrease. In another embodiment, the rate of rise may not be equal to the rate of decrease. As shown in Figure 2, the pulse rises from D0 to D1 in t1 and from D1 to D0 in t3-t2. When the power tool processes one of the materials, the rising rate can be set equal to the falling rate, ie T1=t3-t2, when the power tool processes another material, the rising rate can be set not equal to the falling rate, for example, the rising speed is greater than the falling rate, that is, t1 < t3 - t2. The invention is not limited thereto.

Please refer to FIG. 3, which is a waveform diagram of Example 2 of the first mode of the present invention. As shown in FIG. 3, the difference from the second embodiment is that the amplitudes of the plurality of pulses are steadily increased, wherein the two pulses are equal, and the amplitudes of the latter two pulses are greater than the amplitudes of the first two pulses. For example, the amplitudes of the first and second pulses are equal to D1, the amplitudes of the third and fourth pulses are equal to D2, and the amplitudes of the fifth and sixth pulses are equal to D3, and the seventh and eighth pulses (in the eighth pulse diagram) The amplitudes are not shown to be equal to D4, and so on, which is not mentioned here. Among them, D4>D3>D2>D1. When the power tool starts to work, the amplitude of the pulse increases slowly, and the subsequent growth is faster. It can also be stably increased by multiple pulses, that is, D4-D3, D3-D2, D2-D1 can be equal or not equal, and the present invention is This is not limited.

In the present embodiment, the characteristic variables may include parameters describing the operating state of the motor, such as the rotational speed of the motor and the impact frequency. Among them, the impact frequency can be greater than 2000 times / sec. The periodic change rule can be set according to the actual needs of the material of the working surface, and the present invention does not limit this. In this way, when the power tool is turned on and the first working mode is used, the control component controls the characteristic variable reflecting the working state of the motor to automatically generate multiple periodic changes according to the preset periodic change rule, and the process of multiple cycles is not affected. The user's influence on the control switch and the operation of the switching device enables the working head to automatically intermittently impact in a single operation of controlling the switch from the start to the release. It can effectively improve the stability of the work of the power tool and reduce the fluctuation of the work of the power tool. As can be seen by those skilled in the art, when the power tool is operated in the first working mode, the process of periodically changing a plurality of times can control the magnitude of the periodic change according to the amount of the pulling operation of the user operation control switch operation, that is, by controlling the switch. The movement operation amount controls the magnitude of the intermittent impact of the working head.

In a possible implementation manner, the control component may be further configured to: when the power tool is in the first working mode, and the control switch is closed, the control component controls the characteristic variable that reflects the working state of the motor to be maintained after the plurality of pulse changes The first amplitude is constant, that is, the working head of the power tool maintains a continuous impact after multiple intermittent impacts, and the magnitude of the continuous impact is not affected by the amount of operation of the control switch. Wherein the first amplitude is greater than or equal to the amplitude of the last pulse. For example, after a number of periodic changes, the control feature variable maintains the first magnitude. The first amplitude is greater than or equal to the magnitude of the periodic variation.

In a possible implementation, the control component is further configured to: control the feature variable to maintain the first amplitude, and may include controlling the feature variable to maintain the first amplitude according to a preset retention rule. That is, a control program is preset in the control component, and the control component continuously controls the characteristic variables reflecting the working state of the motor according to the control program.

In this implementation, the retention rule may be set according to the material of the work surface, the type of work, and the like, which is not limited by the present invention.

In this way, when the power tool is in the first working mode and the control switch is closed, the characteristic variable that reflects the working state of the motor generates a plurality of periodic changes, and then the control characteristic variable maintains the first amplitude, and the entire working process of the power tool is not controlled. The effect of the stroke amount of the switch. The fragile and explosive working surface of ordinary glazed tiles, vitrified tiles and the like can be buffered during the multiple cycle changes of the characteristic variables of the working state of the motor, thereby reducing or even avoiding harmful damage to the working surface. A person skilled in the art can set a specific working state of the power tool in the first working mode according to actual needs, which is not limited by the present invention.

As can be seen by those skilled in the art, the power tool maintains the first amplitude of the characteristic variable reflecting the working state of the motor during the continuous change phase of the first working mode, wherein the first amplitude can be changed according to the change of the stroke amount of the control switch. Different working surfaces, the user can control the first range to change with the material of the working surface, and the efficiency is higher.

In one possible implementation, the characteristic variable can include the rotational speed of the motor.

In one possible implementation, the feature variable can also have a duty cycle. The duty ratio is the ratio of the energization time of the motor 2 to the total on/off time.

In this implementation, the characteristic variable may further include other parameters such as a power-on frequency capable of controlling the rotation of the motor, which is not limited by the present invention.

In a possible implementation manner, the user selects a second working mode by operating a function switching button, and the second working mode may be a continuous working mode, such as a hammer drilling mode, and the control component controls the working state of the motor according to the selection of the function switching button. The characteristic variables continue to change.

In a possible implementation manner, the control component may be further configured to continuously control the characteristic variable reflecting the working state of the motor according to the amount of the operation operation of the control switch by the user in the second working mode.

In this implementation, the characteristic variable of the operating state of the motor can be controlled according to the degree of pressing of the control switch by the user, the angle of rotation, and the operating time of the corresponding operation. For example, the greater the force the user presses the control switch, the higher the rotational speed of the motor, and the longer the user presses, the longer the motor will last at the corresponding rotational speed. In this way, in the second working mode, the characteristic variable can be manually controlled by the user according to the amount of pulling operation of the control switch by the user.

In another possible implementation, when the power tool is in the second mode of operation and the control switch is closed, the characteristic variable can also rise to a constant value and maintain the constant value during operation.

Figure 4 is a waveform diagram showing a second mode of operation of the present invention. As shown in FIG. 4, the working principle and process of the second working mode are described by taking the characteristic variable as the rotational speed of the motor as an example. When the power tool is in the second working mode, if it is detected that the user continuously increases the pressing force of the control switch in t0~t1, the rotation speed of the motor is continuously increased from the initial value v0" until the rotation speed v1". Then, after t1, it is detected that the user no longer increases the pressing force on the control switch, and keeps the fixed pressing force for a certain time, and then controls the motor to rotate at the speed v1 according to the rotation speed v1" determined by the user's current pressing force on the control switch. "Stable rotation. Wherein, the initial value v0" may be zero, that is, the motor is accelerated from a stationary state to v1". The user can also increase or decrease the rotational speed of the motor as many times as needed, which is not limited by the present invention.

In the first mode of operation, the characteristic variable that controls the operating state of the motor generates a plurality of periodic changes, and after the plurality of periodic changes, that is, after the plurality of pulse changes, controlling the characteristic variable to maintain the first amplitude or The first value. Several exemplary implementations of the characteristic variables of the operating state of the motor that produce multiple periodic variations are given below. In the following example, only the rotational speed of the motor is taken as an example. However, in practice, the duty cycle can also be changed in the same manner as the rotational speed of the motor. In the first working mode, the periodic change of the duty cycle can be referred to The rotational speed of the motor is a specific description of the periodic variation of the characteristic variables of the example.

In a possible implementation manner, the characteristic variable that controls the working state of the motor generates a plurality of periodic changes according to a preset period change rule, and may include: controlling a characteristic variable of an operating state of the motor to generate at least one first period change. The first period change may include: rising from the initial value to the second value in the first time; maintaining the second value to run the second time; decreasing from the second value to the third value in the third time; maintaining The third value runs for the fourth time.

In this implementation, the characteristic variable can be controlled to rise from the initial value to the second value with a fixed acceleration or an unfixed acceleration, and the characteristic variable can be controlled to decrease from the second value to the third value with a fixed acceleration or an unfixed acceleration, for example, , the initial value is linear (such as 0 line in Figure 5), the curve (such as 2 lines in Figure 5), the broken line (such as 1 line in Figure 5), etc., rises to the first amplitude, and makes the second value straight. (5 lines in Figure 5), curves (3 lines in Figure 5), and broken lines (4 lines in Figure 5) are reduced to a third value. A person skilled in the art can set the rising mode and the falling mode of the value of the characteristic variable according to actual needs, which is not limited by the present invention.

Wherein, the initial value may be 0, and the first value represented by the first amplitude may be the rotational speed of the motor under normal operation.

In a possible implementation, each time the first period change may include: rising from the initial value to the second value from the initial value in the first time; maintaining the second value to run the second time; in the third time The second value is decreased from the second value to the third value; the third value is maintained for the fourth time.

In a 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 can be controlled to rise from the initial value to the second value at the first acceleration a1 during the first time. And, the characteristic variable can be controlled to decrease from the second value to the third value at the second acceleration a2 in the 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|, a1=-a2, or may be different. The first acceleration and the second acceleration can be set according to the material properties of the working surface and actual needs. It should be understood that the first acceleration and the second acceleration may be set according to actual needs by those skilled in the art, which is not limited by the present invention.

Fig. 5 is a waveform diagram showing an example 3 of the first mode of the present invention. In the first example, after the control feature variable generates a plurality of first period changes, the control feature variable maintains the first amplitude. As shown in FIG. 5, the first example will be described by taking the characteristic variable as the rotational speed of the motor as an example. The second value is the same as the first value represented by the first amplitude, and the third value is the same as the initial value.

In the first first period change, in t0 to t1, the rotation speed of the control motor is increased from the initial value v0 to the second value v1, and then the motor is controlled to rotate at the second value v1 as the rotation speed in t1 to t2. In t2 to t3, the rotation speed of the control motor is decreased from the second value v1 to the third value v0, and then in t3 to t4, the control motor is rotated at the third value v0.

In the second first period change, during the time interval t4 to t8, the rotation process of the motor repeat time interval t0 to t4 is controlled to rotate.

Finally, in the time interval t8 to t9, the rotation speed of the control motor is raised from the third value v0 to the first value v1, and after the motor rotation speed reaches the first value v1, the control motor continues to rotate at the first value v1. In the first example, the working process of the first example is described by taking the first characteristic change of the control feature variable as an example. The number of times of the first cycle change can be set according to actual needs, which is not limited by the present invention. .

Fig. 6 is a waveform diagram showing an example 4 of the first mode of the present invention. In Example 2, after the control feature variable generates a plurality of first period changes, the control feature variable maintains the first amplitude. As shown in FIG. 6, the example 2 is described by taking the characteristic variable as the rotational speed of the motor as an example. Wherein the second value is the same as the first value indicated by the first amplitude, and the third value V1' is greater than the initial value V0'. specifically:

In the first first period change, in t0~t1, the rotation speed of the control motor is raised from the initial value V0' to the second value V2', and then in the t1 to t2, the motor is controlled to have the second value V2' as the rotation speed. Make a turn. In t2 to t3, the rotation speed of the control motor is decreased from the second value V2' to the third value V1', and then, in t3 to t4, the control motor is rotated at the third value V1'.

In the second first period change, in t4 to t5, the rotation speed of the control motor is raised from the third value V1' to the second value V2', and then in the range of t5 to t6, the motor is controlled to have the second value V2'. The rotation speed is rotated. In t6 to t7, the rotational speed of the control motor is decreased from the second value V2' to the third value V1', and then in t7 to t8, the motor is controlled to rotate at the third value V1'.

Finally, in t8~t9, the rotation speed of the control motor is raised from the third value V1' to the first value V2', and after the motor rotation speed reaches the first value V2', the control motor continues to rotate at the first value V2'. . In the second example, the working process of the second example is described by taking only the first characteristic change of the control characteristic variable as an example, and the number of times of the first cycle change and the value of each speed are set according to actual needs, and the present invention is This is not limited.

In this way, after starting up (after time t0), the motor's speed does not return to zero, always keeps rotating, avoiding the frequent shutdown and restart of the motor, reducing the loss of the motor, and avoiding the large restart of the motor after braking. Current problem.

In a possible implementation manner, controlling a characteristic variable that reflects a working state of the motor to generate a plurality of periodic changes according to a preset periodic change rule, and further comprising: generating at least one first periodic change in controlling a characteristic variable that reflects a working state of the motor Thereafter, controlling the characteristic variable reflecting the operating state of the motor produces at least one second periodic change. The second period change may include: rising from the third value to the fourth value in the fifth time; maintaining the fourth value to run the sixth time; and descending from the fourth value to the fifth value in the seventh time; Keep the fifth value running for the eighth time.

In this implementation, the characteristic variable may be controlled to rise from the third value to the fourth value with a fixed acceleration or an unfixed acceleration, and the characteristic variable may be controlled to decrease from the fourth value to the fifth value with a fixed acceleration or an unfixed acceleration. For example, the third value is increased to a fourth value in a straight line, a curved line, or a broken line, and the fourth value is decreased to a fifth value in a straight line, a curved line, or a broken line. A person skilled in the art can set the rising mode and the falling mode of the value of the characteristic variable according to actual needs, which is not limited by the present invention.

In a possible implementation manner, each time the second period change may include: rising from a third value to a fourth value from a third value in a fifth time; maintaining a fourth value to run a sixth time; The fourth value is decreased from the fourth value to the fifth value; the fifth value is maintained for the eighth time.

In this implementation, during the fifth time, the characteristic variable can be controlled to rise from the third value to the fourth value at the third acceleration a3. And, the characteristic variable can be controlled to decrease from the fourth value to the fifth value at the fourth acceleration a4 in 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|, a3=-a4, or may be different. The third acceleration and the fourth acceleration can be set according to the material properties of the working surface and actual needs. It should be understood that the third acceleration and the fourth acceleration may be set according to actual needs by those skilled in the art, which is not limited by the present invention.

In a possible implementation, the second value may be less than or equal to the fourth value, and the fourth value may be less than or equal to the first value.

In one possible implementation, the initial value may be less than or equal to the third value, and the third value may be less than or equal to the fifth value.

In this way, the impact on the working surface can be formed by the weakening and strongening effect, which further acts as a cushioning effect and reduces the damage to the working surface.

Fig. 7 is a waveform diagram showing an example 5 of the first mode of the present invention. In the third example, after the control feature variable generates a plurality of first period changes, the control feature variable is continuously controlled to generate a plurality of second period changes, and finally the control feature variable maintains the first amplitude. As shown in FIG. 7, the example 3 is described by taking the characteristic variable as the rotational speed of the motor as an example. The third value and the fifth value are both v0' and the first value is the same as the first value, and the second value v1' is smaller than the first value v2'. specifically:

In the first period change, the rotational speed of the control motor is increased from the initial value v0' to the second value v1' in t0 to t1, and then the motor is controlled to rotate at the second value v1' as the rotational speed in t1 to t2. In t2 to t3, the rotation speed of the control motor is decreased from the second value v1' to the third value v0', and then in t3 to t4, the control motor is rotated at the third value v0'.

In the second period change, the rotational speed of the control motor is increased from the third value v0' to the fourth value v2' in t4 to t5, and then the motor is controlled to rotate at the fourth value v2' as the rotational speed in t5 to t6. In t6 to t7, the rotational speed of the control motor is decreased from the fourth value v2' to the fifth value v0', and then in t7 to t8, the motor is controlled to rotate at the fifth value v0'.

Finally, in t8~t9, the rotation speed of the control motor is raised from the fifth value v0' to the first value v2', and after the motor rotation speed reaches the first value v2', the control motor continues to rotate at the first value v2'. . In the third example, the working process of the third example is described by taking only the first periodic change and the second periodic change of the control characteristic variable as an example, and the first cycle change and the second cycle change may also be generated according to actual needs. The number of times is set, which is not limited by the present invention.

Fig. 8 is a waveform diagram showing an example six of the first mode of the present invention. In the fourth example, after the control feature variable generates a plurality of first period changes, the control feature variable is continuously controlled to generate a plurality of second period changes, and finally the control feature variable maintains the first amplitude. As shown in FIG. 8, the example 4 is described by taking 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 the same as the first value indicated by the first amplitude, and the second value V2 is smaller than the first value V3. . specifically:

In the first period change, in t0 to t1, the rotation speed of the control motor is increased from the initial value V0 to the second value V2, and then in t1 to t2, the control motor is rotated at the second value V2. In t2 to t3, the rotation speed of the control motor is decreased from the second value V2 to the third value V1, and then in t3 to t4, the control motor is rotated at the third value V1.

In the second cycle change, the rotational speed of the control motor is increased from the third value V1 to the fourth value V3 in t4 to t5, and then the motor is rotated at the fourth value V3 as the rotational speed in t5 to t6. In t6 to t7, the rotation speed of the control motor is decreased from the fourth value V3 to the fifth value V1, and then in t7 to t8, the control motor is rotated at the fifth value V1.

Finally, in t8 to t9, the rotation speed of the control motor is raised from the fifth value V1 to the first value V3, and after the motor rotation speed reaches the first value V3, the control motor is continuously rotated at the first value V3. In the third example, the working process of the fourth example is described by taking the first characteristic change and the second time change of the control characteristic variable as an example, and the first cycle change and the second cycle change may be generated according to actual needs. The number of times and the respective rotational speed values are set, which is not limited in the present invention.

The power tool can pre-store any one or more of the above modes as various options of the first working mode and select by the switching device.

In the above mode examples one, two, three and four, the time between t0 and t1, the time between t4 and t5 may be greater than 0.1 second, the time between t2 and t3, and the time between t6 and t7 may be greater than 0.3 seconds. The first value may be greater than 300 revolutions per second, and when the third value is greater than the initial value, it may be less than 200 revolutions per second. In this way, the damage of the working surface can be reduced, and the success rate of the punching can be improved.

In a possible implementation manner, the switching between the first working mode and the second working mode of the power tool may include any one of the following modes: the power tool is in the first working mode and the second working mode according to the position of the switching device. Switch between. The power tool is switched between the first operating mode and the second operating mode according to the number of presses of the switching device. Or the switching device is pressed and the power tool enters the first mode of operation.

In this implementation, the switching device can be integrated into the control switch, so that the control switch can be used as a trigger switch to control the switching between the motor and the power source, and can also switch between the first working mode and the second working mode, In an achievable manner, the control switch includes a first position and a second position, when the first position is pressed, the power of the power source is transmitted to the motor, and the power tool is activated; when the second position of the control switch is pressed, the first of the control tool Switching between the working mode and the second working mode. As will be appreciated by those skilled in the art, the switching device can be a separate switch or a separate knob that can be rotated or twisted to determine the mode of operation of the power tool selected by the user by detecting a change in state that occurs after the user operates the knob. The working mode of the power tool selected by the user can be determined according to the rotation direction, the angle, the number of times, and the like of the knob. For example, if it is detected that the knob is rotated clockwise from the initial position, the operating mode of the power tool is switched to the first working mode; if it is detected that the knob is rotated counterclockwise from the initial position, the operating mode of the power tool is switched to The second mode of work. It can also be set to switch the working mode of the power tool to the first working mode if it detects that the knob is rotated clockwise or counterclockwise from the initial position; if the knob is detected, the knob is rotated clockwise or counterclockwise from the initial position. Then, the working mode of the power tool is switched to the second working mode. The switching device may also be a button that can be pressed multiple times, and the switching between the first working mode and the second working mode is controlled by the number of times the button is pressed by the user. For example, if the button is pressed once, the operating mode of the power tool is switched to the first working mode; if the button is pressed twice, the operating mode of the power tool is switched to the second mode. Alternatively, the switching device may be a membrane switch, and the membrane switch is provided with an indicator light for indicating whether the switching device is triggered. When the user presses the switching device, the switching device is triggered, the indicator light works, and the power tool enters the first working mode, that is, the intermittent control mode.

It should be understood that the switching device and the switching mode of switching the working mode of the power tool between the first working mode and the second working mode based on the switching device may be set according to actual needs, and the present invention does not limited. In this way, the switching process between the working modes can be simplified, which brings convenience to the user's use and saves the user's time.

It should be noted that although the above-described embodiment is described as an example of a control device for a power tool as described above, those skilled in the art can understand that the present invention is not limited thereto. In fact, the user can flexibly set the component according to personal preference and/or actual application scenario, as long as it conforms to the technical solution of the present invention.

The control device and method for the power tool and the power tool provided by the embodiment of the present invention, when the power tool is turned on and operating in the first working mode, the control component controls the characteristic variable reflecting the working state of the motor according to a preset period. The change rule automatically generates multiple periodic changes, thereby effectively reducing the harmful damage of the power tool to the working surface, and improving the success rate of the power tool for punching on the working surface. The process of multiple cycle changes is automatically performed according to preset periodic change rules, and is not affected by the operation of the control switch and the switching device by the user, and can effectively improve the stability of the work of the power tool and reduce the fluctuation of the work of the power tool.

Please refer to FIG. 9 , which is a schematic structural view of a power tool according to the present invention. The electric power tool of the present invention comprises: a motor 1 having a motor shaft 11; an output shaft 2 for accommodating the working head 21; a transmission mechanism 3 disposed between the motor shaft 11 and the output shaft 2; and a hammer mechanism 4 for Providing a hammering force for the working head 21, comprising an output shaft 2 and a piston housed in the output shaft 2, a ram that is intermittently struck by the piston, and a ram that is intermittently struck by the ram; the first housing 5 is for receiving At least a portion of the hammer mechanism 4, wherein the output shaft 2 is partially exposed to the first housing 5; the second housing 6 is coupled to the first housing 5 for supporting the transmission mechanism 3; the third housing 7, and the second The housing 6 is connected for receiving at least part of the motor 1.

The transmission mechanism 3 includes a first intermediate shaft 31 for driving the hammer mechanism 4, the first intermediate shaft 31 having a first end adjacent to the motor 1 and a second end remote from the motor 1, the first end of the first intermediate shaft 31 being fixed It is supported on the second casing 6 and shares the load it receives by the second casing 6.

Specifically, the electric power tool in this embodiment includes a motor 1 for driving the rotation of the working head, and the motor 1 has a motor shaft 11 that outputs power to the electric power tool by its own rotation so that the working head 21 in the electric power tool Rotation is generated, or a hammering force is partially or wholly provided to the working head 21 by the hammer mechanism 4 to effect a hammering motion.

The output shaft 2 is for accommodating the working head 21, and drives the working head 21 to perform operations such as rotation. In order to connect the output shaft 2 and the motor shaft 11, the power tool includes a transmission mechanism 3, and the transmission mechanism 3 can realize a connection transmission and a power output between the output shaft 2 and the motor shaft 11 through a transmission structure such as an intermediate shaft and a gear.

Specifically, the transmission mechanism 3 generally includes a plurality of intermediate shafts, which are respectively used to output rotational power to the output shaft 2 or to drive the hammer mechanism 4 to perform hammering. Wherein the transmission mechanism 3 comprises a first intermediate shaft 31 for driving the hammer mechanism 4, the first intermediate shaft 31 having a first end adjacent to the motor 1 and a second end remote from the motor 1, the first of the first intermediate shaft 31 The end is fixedly supported on the second housing 6, and the second end of the first intermediate shaft 31 is provided as a cantilever.

Since the second end of the first intermediate shaft 31 is not connected to the first housing 5, but is provided as a cantilever that is suspended, such that the suspended second end of the first intermediate shaft 31 is also subjected to an alternating load. The load is not transmitted to the first housing 5.

In order to perform drilling, hammering and drilling combined with hammering, the power tools have different working modes. In different working modes, the intermediate shaft and different transmission components can be switched by the clutch mechanism. Connecting or disconnecting between the two, respectively, to drive the intermediate shaft under the rotation of the motor shaft 11, driving the corresponding transmission member and the working head 21 to generate one or more of a rotation or a linear reciprocating motion, thereby causing the electric tool to perform Corresponding drilling or hammering function.

Further, in order to drive the tool head 21 to rotate so that the hammer mechanism 4 performs the drilling operation, the transmission mechanism 3 further includes a second intermediate shaft 32 for driving the rotation of the output shaft 2, and the second intermediate shaft 32 has a portion close to the motor 1. At one end and away from the second end of the motor 1, the first end of the second intermediate shaft 32 is movably supported on the second housing 6, and the second end of the second intermediate shaft 32 is movably supported on the first housing 5.

Wherein, in order to avoid interference between the mechanisms, the first intermediate shaft 31 and the second intermediate shaft 32 are generally disposed on both sides of the motor shaft 11, and the first intermediate shaft 31 and the second intermediate shaft 32 are both driven by gears and the like. The power is taken from the motor shaft 11, the first intermediate shaft 31 is meshed with the pinion gear on the motor shaft 11 by the first gear 312 to obtain the power generated by the motor 1, and the second intermediate shaft 32 is passed through the second gear and the motor shaft 11. The gear meshing acquires the power generated by the motor 1, and then transmits power to the corresponding components through a connection with other components and structures, thereby respectively realizing the rotation and impact of the working head 21.

Generally, the axial directions of the second intermediate shaft 32 and the motor shaft 11 are both disposed in the vertical direction, and the motor shaft 11 and the motor 1 are generally disposed at the lowermost portion of the hammer mechanism 4, and the transmission is disposed above the motor 1. Mechanism 3, first housing 5, and the like. When one end of the second intermediate shaft 32 is connected to the second casing 6, since the second casing 6 is located between the motor 1 and the transmission mechanism 3, it is connected to the second casing 6, that is, the middle cover. It is usually the bottom end of the second intermediate shaft 32. Thus, the bottom end of the second intermediate shaft 32 is movably supported on the second casing 6, and the top end of the second intermediate shaft 32 is movably supported on the first casing 5 and connected to the transmission mechanism 3 or the output shaft 2.

In this embodiment, the first intermediate shaft 31, the second intermediate shaft 32, and the motor shaft 11 are in the same plane, and the gear centers of the first gear, the second gear, and the pinion are located on a straight line. This arrangement allows the force to be evenly distributed when each gear meshes with the motor shaft, thereby increasing the service life of the gear.

When the driving work head 21 realizes the drilling operation, since the second intermediate shaft 32 always rotates around its own rotating shaft under the power of the motor 1, the second intermediate shaft 32 can directly drive the output shaft 2 through a gear connection or the like. Turn to drill.

The power tool of the present invention is provided with a function conversion button for realizing switching of four functions of drilling, hammer drilling, adjustment and hammer. The switching device on the power tool can be combined with the other four functions, so that when the power tool is used as an electric drill or a hammer drill, the first mode and the second mode can be selected. When it is required to open a hole in a tile surface such as a vitrified tile, the user presses or toggles the switching device so that the first operating mode of the switching device is triggered, and the control component controls the characteristic variable of the operating state of the motor to intermittently change. As known to those skilled in the art, the switching device can be other types of switches, for example, can be integrated into the function switching button, so that the function switching button can realize five functions of drilling, hammer drilling, angle adjustment, hammer and intermittent control.

Fig. 10a is a front view of a power tool of the present invention, and Fig. 10b is a plan view of a power tool of the present invention. The power tool may include the above-described control device for the power tool. As shown in FIGS. 10a and 10b, the switching device 40 for the control device of the power tool is disposed at the upper portion of the power tool, and the control switch 30 is disposed at the handle of the power tool, which is convenient for the user to operate. Figure 10c is a front elevational view of another power tool of the present invention, the switching device 40' for switching the intermittent control mode is disposed inside the power tool handle, the upper portion of the battery pack, as shown in Figure 10c, the switching device 40' is set On the inner side of the handle, the user can be prevented from being erroneously triggered, and at the same time, the wear of the film switching device 40' caused by the switching device 40' during the moving process can be prevented.

In the present embodiment, when the user intends to punch holes on a fragile and explosive working surface such as a tile, the switching device 40 may be operated to switch the power tool to the first working mode. After the user places the punched portion of the power tool on the pre-punched area of the tile, the user opens the control switch 30 to activate the motor of the power tool. The device control motor is rotated in a manner such as the above-described example to achieve a punching process.

In this embodiment, when the user intends to punch a hole on a conventional non-fragile and non-explosive working surface such as a wall, the control switch 30 may be operated to switch the power tool to the second working mode according to the user. The pulling operation amount controls the characteristic variable reflecting the working state of the motor to realize the punching process. In another embodiment, when the user intends to punch a hole on a conventional non-fragile and non-explosive working surface such as a wall, the user can switch to the second working mode by rotating the function conversion button on the power tool, according to the user. The amount of pull operation controls the characteristic variables that reflect the operating state of the motor.

The power tool provided by the embodiment of the invention can work in a plurality of working modes and has a wide range of uses. When the power tool is turned on and operates in the first working mode, the control component controls the characteristic variable reflecting the working state of the motor to automatically generate a plurality of periodic changes according to a preset period change rule. The process of multiple cycle changes is not affected by the user's operation of the control switch and the switching device, and can effectively improve the stability of the work of the power tool and reduce the fluctuation of the work of the power tool. It can improve the success rate of punching and other operations on the working surface, and reduce harmful damage to the working surface.

Figure 11 is a flow chart of a control method for a power tool of the present invention. As shown in FIG. 11, the method may include steps S11 to S13.

In step S11, the state of the control switch of the electric power tool and the switching device are determined, wherein the switching device switches the power tool between the first working mode and the second operating mode according to a user operation.

In step S12, when the power tool is in the first working mode and the control switch is closed, the characteristic variable that controls the working state of the motor generates a plurality of periodic changes according to a preset periodic change rule.

Figure 12 is a flow chart of a control method for a power tool of the present invention.

In a possible implementation manner, as shown in FIG. 12, the method may further include step S13 in addition to the foregoing steps S11 and S12.

In step S13, after a plurality of periodic changes, the control feature variable maintains the first value.

In a possible implementation manner, step S13 may further include: controlling the feature variable to maintain the first value according to a preset retention rule.

In a possible implementation manner, the characteristic variable that controls the working state of the motor generates a plurality of periodic changes according to a preset period change rule, and may include: controlling a characteristic variable of an operating state of the motor to generate at least one first period change.

The first period change includes: increasing from the initial value to the second value in the first time; maintaining the second value to run the second time; decreasing from the second value to the third value in the third time; maintaining the first The third value runs for the fourth time.

In a possible implementation manner, each time the first period change comprises: rising from the initial value to the second value from the initial value in the first time; maintaining the second value to run the second time; The second value drops to a third value with a second acceleration; the third value is maintained for a fourth time.

In a possible implementation manner, 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 a possible implementation manner, the characteristic variable that controls the working state of the motor generates a plurality of periodic changes according to a preset period change rule, and may further include: generating at least one first period change in the characteristic variable that controls the working state of the motor Thereafter, the characteristic variable that controls the operating state of the motor produces at least one second periodic change.

The second period change may include: rising from the third value to the fourth value in the fifth time; maintaining the fourth value to run the sixth time; and descending from the fourth value to the fifth value in the seventh time; Keep the fifth value running for the eighth time.

In a possible implementation manner, the second value is less than or equal to the fourth value, and the fourth value is less than or equal to the first value.

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.

Figure 13 is a flow chart of a control method for a power tool of the present invention.

In a possible implementation manner, as shown in FIG. 13, the method may further include step S14 in addition to the above steps S11 to S13.

In step S14, the power tool is in the second operation mode, and the characteristic variable reflecting the operating state of the motor is controlled according to the amount of operation of the control switch by the user.

In a possible implementation manner, the switching between the first working mode and the second working mode of the power tool may include any one of the following modes: the power tool is in the first working mode and the second working mode according to the position of the switching device. Switching between; the power tool is switched between the first working mode and the second working mode according to the number of pressing of the switching device.

In a possible implementation manner, the characteristic variable may further include a duty ratio, wherein the duty ratio is a ratio of a power-on time of the motor to a total power-off time.

With regard to the method in the above embodiment, the specific manner of each step has been described in detail in the embodiment relating to the device, and will not be explained in detail herein.

In a possible implementation, the following steps are included:

Step S110: performing a switching between the first working mode or the second working mode by the switching device and generating a switching signal to the control component. According to the user operation, the switching device performs switching between the first working mode and the second working mode. Specifically, according to the user operation, the switching device generates a signal related to the first working mode or a signal of the second working mode to the control component.

Step S120: When switching to the first working mode, the control component selects the corresponding first control mode to control the characteristic variable reflecting the working state of the motor to generate a plurality of periodic changes according to a preset periodic change rule. When the switching device transmits the switching signal to the control component according to the first operating mode of the user operating parameter, the control component selects the first control mode to control the motor, and specifically controls the characteristic variable reflecting the working state of the motor according to a preset period. Rules produce multiple periodic changes.

Step S130: When the amount of the stroke of the control switch reaches a preset value, the control characteristic variable maintains the first value. During the periodic variation of the motor characteristic variable, when the user pulls the control switch such that the amount of the stroke of the control switch reaches a preset value, the control component controls the characteristic variable to maintain the first value.

Step S140: When switching to the second working mode, the control component selects the corresponding second control mode to control the continuous change of the characteristic variable reflecting the working state of the motor. When the switching device transmits the switching signal according to the second operating mode of the user operating parameter to the control component in step S110, the control component selects the second control mode to control the motor, and specifically controls the characteristic variable reflecting the working state of the motor after the motor is started, the feature The variables change continuously.

The control device and method for the power tool and the power tool provided by the embodiment of the present invention, when the power tool is turned on and operating in the first working mode, the control component controls the characteristic variable reflecting the working state of the motor according to a preset period. The change rule automatically generates multiple periodic changes, thereby effectively reducing the harmful damage of the power tool to the working surface, and improving the success rate of the power tool for punching on the working surface. The process of multiple cycle changes is automatically performed according to the preset cycle change rule, and is not affected by the operation of the control switch and the switching device, and can effectively improve the stability of the work of the power tool and reduce the fluctuation of the work of the power tool.

The embodiments of the present invention have been described above, and the foregoing description is illustrative, not limiting, and not limited to the disclosed embodiments. Numerous modifications and changes will be apparent to those skilled in the art without departing from the scope of the invention. The choice of terms used herein is intended to best explain the principles, practical applications, or improvements of the techniques in the various embodiments of the embodiments, or to enable those of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

A power tool, characterized in that the power tool comprises:

motor;

Output shaft, mated with the working head;

a motion conversion mechanism connecting the motor and the output shaft to convert the rotational motion of the motor into an axial impact transmission to the working head;

Controlling a switch for disconnecting or turning on an electrical connection between the power source and the motor;

a control assembly comprising a controller and an electronic switch, the electronic switch being located between the motor and the controller, the controller controlling the switching of the electronic switch to intermittently control a characteristic variable reflecting the operating state of the motor, such that The head of the electric power tool is intermittently impacted, and the intermittent impact is the same as the control for intermittently changing the power supply of the motor, similarly to the case where the opening and closing operations of the control switch are repeated.
The electric power tool according to claim 1, wherein said control unit performs intermittent control on a characteristic variable reflecting said motor operating state and then performs continuous control.
The power tool according to claim 1, further comprising:

a switching device, the switching device is connected to the control component, the switching device generates a control signal to the control component according to a user operation, and the control component controls the power tool in a first working mode and a second working mode Switch between

Wherein, when the power tool is in the first working mode, the control component intermittently controls a characteristic variable reflecting the working state of the motor; when the power tool is in the second working mode, the control component reflects The characteristic variables of the operating state of the motor are continuously controlled.
The power tool according to claim 1, wherein said power tool has a single impact energy of 1.6 joules or more and 3 or less joules, and said control unit intermittently controls characteristic variables reflecting said motor operating state. When the impact frequency of the working head is greater than 2000 times/second, less than 4800 times/second, and the single impact energy is 1.6 joules, the control component changes the characteristic variable reflecting the working state of the motor according to the first period, wherein The first period is greater than or equal to 0.1 second, less than or equal to 2 seconds, and when the single impact energy is 3 joules, the control component changes the characteristic variable reflecting the working state of the motor according to the second period, wherein the second period is greater than or equal to 0.1 second is less than or equal to 1.5 seconds.
The electric power tool according to claim 2, wherein when the stroke amount of the control switch reaches a preset value, the control unit switches from intermittent control to continuous control to a characteristic variable reflecting the operating state of the motor.
The power tool according to claim 2, wherein said control component switches from intermittent control to continuous control to a characteristic variable reflecting said motor operating state after said control switch is closed for a preset time.
The power tool according to claim 1, wherein said control unit intermittently controls characteristic variables reflecting said motor operating state, comprising:

The control component controls a characteristic variable reflecting the operating state of the motor to generate a plurality of pulses according to a preset periodic variation rule.
The power tool according to claim 7, wherein among the plurality of pulses, the amplitude of the latter pulse is greater than or equal to the amplitude of the previous pulse.
The electric power tool according to claim 7, wherein the amplitude of the plurality of pulses is gradually increased by a preset value.
The power tool according to claim 7, wherein after the plurality of pulses, the control component controls the characteristic variable reflecting the operating state of the motor to maintain the first value, wherein the first value is greater than or equal to the last one The amplitude of the pulse.
The power tool according to claim 10, wherein the waveform of said single pulse comprises:

Increase from the initial value to the second value in the first time;

Maintaining the second value for a second time;

Decreasing from the second value to a third value in a third time;

Keeping the third value running for a fourth time.
The electric power tool according to claim 11, wherein a rate at which said single pulse rises from an initial value to a second value is different from a rate of decrease from a second value to a third value.
The electric power tool according to claim 7, wherein a plurality of said pulses rise at different rates.
The power tool according to claim 11, wherein said second value is less than or equal to a first value, said initial value being less than or equal to said third value.
The electric power tool according to claim 1, wherein when the electric power tool is in the second operation mode, the control component pair reflects the working state of the motor according to an operation amount of the control switch by a user. The characteristic variables are continuously controlled.
The power tool according to claim 1, wherein said power tool further comprises a function switching button for effecting switching of four functions of drilling, hammer drilling, adjustment and hammer.
The power tool according to claim 1, wherein the characteristic variable reflecting the operating state of the motor comprises a rotational speed of the motor.
The power tool according to claim 1, wherein the characteristic variable reflecting the operating state of the motor comprises a duty ratio, wherein the duty ratio is the energization time of the motor relative to the total on/off time proportion.
A control device for a power tool, the power tool including a motor, an output shaft coupled to the working head, and a motion conversion mechanism, the motion conversion mechanism connecting the motor and the output shaft for converting the rotational motion of the motor to the axial direction The impact transmission to the working head is characterized in that the control device comprises:

Controlling a switch for disconnecting or turning on an electrical connection between the power source and the motor;

a control assembly comprising a controller and an electronic switch, the electronic switch being located between the motor and the controller, the controller controlling the switching of the electronic switch to intermittently control a characteristic variable reflecting the operating state of the motor, such that The head of the electric power tool is intermittently impacted, and the intermittent impact is the same as that in the case where the opening and closing operations of the control switch are repeated, and the power supply of the motor is intermittently changed.
The control device for a power tool according to claim 19, wherein said control unit performs intermittent control on a characteristic variable reflecting said motor operating state and then performs continuous control.
The control device for a power tool according to claim 19, further comprising:

a switching device, the switching device is connected to the control component, the switching device generates a control signal to the control component according to a user operation, and the control component controls the power tool in a first working mode and a second working mode Switch between

Wherein, when the power tool is in the first working mode, the control component intermittently controls a characteristic variable reflecting the working state of the motor; when the power tool is in the second working mode, the control component reflects The characteristic variables of the operating state of the motor are continuously controlled.
The control device for a power tool according to claim 19, wherein said power tool has a single impact energy of 1.6 joules or more and 3 or less joules, and said control component has a characteristic variable reflecting said motor operating state. Performing intermittent control such that the impact frequency of the working head is greater than 2000 times/second, less than 4800 times/second, and when the single impact energy is 1.6 joules, the control component follows the first period of the characteristic variable reflecting the working state of the motor. a change, wherein the first period is greater than or equal to 0.1 second, less than or equal to 2 seconds, and when the single impact energy is 3 joules, the control component changes the characteristic variable reflecting the working state of the motor according to the second period, wherein the second period The period is greater than or equal to 0.1 seconds and less than or equal to 1.5 seconds.
The control device for a power tool according to claim 20, wherein when the stroke amount of the control switch reaches a preset value, the control component switches from the intermittent control to the characteristic variable reflecting the working state of the motor Continuous control.
The control device for a power tool according to claim 20, wherein said control component switches from intermittent control to continuous control to a characteristic variable reflecting said motor operating state after said control switch is closed for a preset time.