CN211517387U - Electric tool - Google Patents
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- CN211517387U CN211517387U CN201922147730.5U CN201922147730U CN211517387U CN 211517387 U CN211517387 U CN 211517387U CN 201922147730 U CN201922147730 U CN 201922147730U CN 211517387 U CN211517387 U CN 211517387U
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Abstract
The utility model relates to an electric tool field discloses an electric tool. The electric tool includes a motor, an impact mechanism, a mode switching member, a detecting member, and a controller. The impact mechanism can utilize the driving force of the motor to form impact on the main shaft along the axial direction of the main shaft in an impact mode; the mode switching piece can move between a first position and a second position, when the mode switching piece is positioned at the first position, the electric tool is positioned in an impact mode, and when the mode switching piece is positioned at the second position, the electric tool is positioned in a non-impact mode; the controller is used for controlling the duty ratio of the motor according to the stroke amount of the trigger switch and adjusting the duty ratio of the motor corresponding to the minimum stroke amount of the trigger switch to be a preset value larger than zero when the current position of the mode switching piece detected by the detection piece is judged to be the first position. Therefore, when the hammer is in an impact mode, the motor can provide enough driving force to form impact on the main shaft along the axial direction of the main shaft when the trigger stroke is small, and the quick hammer starting is realized.
Description
Technical Field
The utility model relates to an electric tool technical field especially relates to an electric tool.
Background
The electric tool is a widely used work tool which is held by hands, and the electric tool gradually replaces a pure manual tool at present. Among them, the electric drilling tool is widely researched and developed as one of the most commonly used hand-held power tools.
The output power of the electric drilling tool is mainly adjusted by pulling a trigger to adjust the duty ratio of a motor, the common trigger is generally made of a potentiometer, the potentiometer generally consists of a resistor body and a movable electric brush, and when the electric brush moves along the resistor body, the output end can obtain a voltage value which has a certain relation with the displacement. Specifically, on the electric drilling tool, as the pulling amount of the trigger is increased, the voltage value acquired by the controller end is larger, and the duty ratio of the motor is further determined according to the corresponding relation between the pre-stored voltage value and the duty ratio of the motor. Generally, the larger the voltage value is, the larger the motor duty ratio is, i.e., the larger the pulling amount of the trigger is, the larger the motor duty ratio is. Conversely, the smaller the pulling amount of the trigger is, the smaller the duty ratio of the motor is, the lower the power is, the smaller the torque is, and the smaller the driving force is.
When the electric tool is in an impact mode, because the pulling amount of the trigger is small, the driving force of the motor is small, the impact mechanism cannot impact the main shaft along the axial direction of the main shaft under the small driving force, so that the hammer starting failure is caused, the hammer can be successfully started only by increasing the pulling amount of the trigger, the hammer starting speed is slow, and the efficiency of the electric tool is low.
SUMMERY OF THE UTILITY MODEL
Accordingly, it is necessary to provide an electric tool that solves the problems of a low hammer starting speed and a low working efficiency when the electric tool is in the impact mode.
A power tool, comprising:
a housing;
a trigger switch;
the main shaft is arranged in the shell, and the end part of the main shaft is provided with a tool head;
the motor is arranged in the shell and used for providing driving force;
the impact mechanism can drive the main shaft to reciprocate along the axial direction of the main shaft by using the driving force of the motor in the impact mode;
a mode switch operable to move between a first position and a second position, the power tool being in an impact mode when the mode switch is in the first position, the power tool being in a non-impact mode when the mode switch is in the second position;
a detecting member for detecting a current position of the mode switching member;
the controller is respectively electrically connected with the detection piece, the trigger switch and the motor, and controls the duty ratio of the motor according to the stroke quantity of the trigger switch;
the controller is further configured to adjust a motor duty ratio corresponding to the minimum stroke amount of the trigger switch to a preset value larger than zero when the current position of the mode switching piece detected by the detection piece is judged to be the first position.
In one embodiment, the detection member includes a first detection element and a second detection element, one of the first detection element and the second detection element is fixed to the mode switching member, and the other of the first detection element and the second detection element is fixed to the housing, and the second detection element falls within a detection range of the first detection element when the mode switching member is in the first position, and the second detection element does not fall within the detection range of the first detection element when the mode switching member is in the second position.
In one embodiment, the housing is sleeved outside the mode switching member, a first groove is disposed on an outer side wall of the mode switching member, a second groove is disposed on an inner side wall of the housing, one of the first detecting element and the second detecting element is fixed in the first groove, and the other of the first detecting element and the second detecting element is fixed in the second groove.
In one embodiment, the first detecting element is a hall sensor, and the second detecting element is a magnet.
In one embodiment, the first sensing element is a proximity sensor and the second sensing element is a magnet.
In one embodiment, the first detecting element is an optical sensor and the second detecting element is an optical identification code.
In one embodiment, the optical sensor is a laser sensor, and the optical identification code is a plurality of concave-convex structures arranged at intervals.
In one embodiment, the preset value is less than or equal to 50%.
The application provides an electric tool, the mode of operation of electric tool can be adjusted through the position of adjusting the mode switch piece, specifically, when the mode switch piece is in the first position, electric tool is in impact mode, when the mode switch piece is in the second position, electric tool is in non-impact mode. The current position of the mode switching piece can be detected through the detection piece and sent to the controller, and when the controller judges that the mode switching piece is in the first position, namely when the electric tool is in an impact mode, the duty ratio of a motor corresponding to the minimum stroke of the trigger switch is adjusted to be a preset value larger than zero. The motor duty cycle increase, promptly for motor speed improves, and power improves, and the moment of torsion grow, and then can make electric tool be in when the impact mode, the motor is when the trigger stroke is less, also can provide sufficient drive power and form along the axial striking of main shaft to the main shaft, realizes opening the hammer fast, improves electric tool's work efficiency.
Drawings
Fig. 1 is a schematic structural view of an electric tool according to an embodiment of the present invention;
fig. 2 is a schematic structural view of a guide member in an electric tool according to an embodiment of the present invention;
fig. 3 is a schematic structural view of an impact switch member in an electric tool according to an embodiment of the present invention;
fig. 4 is a schematic structural view of the electric power tool according to the embodiment of the present invention when the impact switch is separated from the guide;
fig. 5 is a schematic diagram illustrating a positional relationship between a first detecting element and a second detecting element when a mode switching member of an electric power tool according to an embodiment of the present invention is at a first position;
fig. 6 is a schematic view illustrating a positional relationship between the first detecting element and the second detecting element when the mode switching member of the electric power tool according to the embodiment of the present invention is at the second position;
fig. 7 is a graph showing a relationship between a trigger switch stroke amount and a motor duty ratio of the electric power tool according to the embodiment of the present invention.
Reference numerals:
10-a housing; 101-a second groove;
20-a motor;
30-an impact mechanism; 301-a ram; 302-a guide; 3021-second stationary teeth; 303-an energy storage element; 304-a first guide; 305-a second guide;
40-a main shaft;
50-mode switching element; 501-a first groove;
60-a detection member; 601-a first detection element; 602-a second detection element;
70-a controller;
80-a transmission mechanism;
90-impact switch; 901-first stationary teeth;
100-a tool head;
200-a battery;
300-trigger switch.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" or "coupled" to another element, it can be directly connected to the other element or intervening elements may also be present, and are also to be broadly construed, e.g., as being fixedly connected, detachably connected, or integrally connected; either mechanically or electrically. The specific meaning of the above terms in the present invention can be understood in specific cases to those of ordinary skill in the art.
As used herein, the terms "vertical," "horizontal," "left," "right," "upper," "lower," "front," "rear," "circumferential," and the like are based on the orientation or positional relationship shown in the drawings and are intended to facilitate the description of the invention and to simplify the description, but do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The embodiment of the utility model provides an electric tool has impact mode and non-impact mode, as shown in fig. 1, including casing 10, trigger switch 300, set up inside casing 10, the tip is used for installing the main shaft 40 of instrument head 100, set up the motor 20 that is used for providing drive power in casing 10, by the impact mechanism 30 of motor 20 drive work, impact mechanism 30 can utilize the drive power formation of motor 20 to follow the axial striking of main shaft 40 under impact mode to make main shaft 40 can drive instrument head 100 reciprocating motion. Also included is a mode switch 50 operable to move between a first position, wherein the power tool is in an impact mode, and a second position, wherein the mode switch 50 is in the second position, wherein the power tool is in a non-impact mode. In addition, the electric tool further comprises a detecting piece 60 and a controller 70, wherein the detecting piece 60 is used for detecting the current position of the mode switching piece 50, and the controller 70 is respectively electrically connected with the detecting piece 60, the trigger switch 300 and the motor 20 and is used for controlling the duty ratio of the motor 20 according to the stroke amount of the trigger switch 300.
The spindle 40 is for receiving a tool head 100 and has a central axis X. In the impact mode, the main shaft 40 reciprocates along its central axis X. In the non-impact mode, the main shaft 40 cannot reciprocate along its central axis X. The mode switch 50 is used to switch the power tool between the impact mode and the non-impact mode.
As shown in fig. 1 and 2, the impact mechanism 30 includes a hammer 301, a guide 302, and an energy storage element 303 abutting on the hammer 301, wherein the hammer 301 is provided with a first guide 304, and the guide 302 is provided with a second guide 305. In the impact mode, the hammer 301 rotates relative to the guide 302, so that the first guide 304 can drive the hammer 301 to move along the central axis X toward the second axial direction a against the acting force of the energy storage element 303 through the second guide 305, and the energy storage element 303 can drive the hammer 301 to move along the central axis X toward the first axial direction B opposite to the second axial direction a to impact the main shaft 40; in the non-impact mode, the hammer 301 and the guide 302 do not rotate relative to each other. In the embodiment shown in fig. 1, the second axis a is horizontal to the left and the first axis B is horizontal to the right.
As an alternative embodiment, the electric power tool provided in the present embodiment further includes a transmission mechanism 80, and the transmission mechanism 80 is configured to transmit the driving force of the motor 20 to at least one of the hammer 301 and the guide 302. The mode switching member 50 is operable to switch between a first position and a second position, and when the mode switching member 50 is in the first position, the hammer 301 can rotate relative to the guide member 302, i.e., there is relative rotation therebetween, and the electric power tool is in the impact mode; when the mode switching member 50 is in the second position, the guide 302 can be rotated by the motor 20, but the hammer 301 and the guide 302 do not rotate relative to each other, and the electric power tool is in the non-impact mode.
In the present embodiment, as shown in fig. 1, 3 and 4, an impact switch member 90 is further included, and the mode switch member 50 is operable to move between the first position and the second position, in effect, the engagement or disengagement of the impact switch member 90 with or from the guide member 302 is achieved by switching the position of the mode switch member 50. Specifically, when the mode switching member 50 is in the first position, the impact switching member 90 is engaged with the guide 302, the guide 302 is fixed with respect to the housing 10, at this time, the hammer 301 is rotated with respect to the guide 302 by the driving of the motor 20, so that the first guide can drive the hammer 301 to move along the central axis X toward the second axial direction a against the urging force of the energy accumulating element 303 through the second guide, the energy accumulating element 303 can drive the hammer 301 to move along the central axis X toward the first axial direction B opposite to the second axial direction a to impact the spindle 40, and the electric power tool enters the impact mode; when the mode switching member 50 moves to the second position, the impact switching member 90 is separated from the guide member 302, the guide member 302 is rotatable with respect to the housing 10, the hammer 301 and the guide member 302 do not rotate relative to each other, and the electric power tool enters the non-impact mode.
In the present embodiment, the mode switching member 50 is provided rotatably with respect to the housing 10, and drives the impact switching member 90 to move axially by rotating. Thus, the operation space of the mode switching member 50 can be reduced. In this manner, when switching between the second position and the first position, the mode switching member 50 is rotated by a certain angle to switch the positions. Of course, as an alternative embodiment, the mode switching member 50 may be axially moved relative to the housing 10 to change the position, thereby driving the impact switching member 90 to move axially.
The impact switch member 90 is provided with first fixing teeth 901, the guide member 302 is provided with second fixing teeth 3021, and the mode switch member 50 rotates with respect to the housing 10 and drives the impact switch member 90 to move along the center line axis X to engage or disengage the first fixing teeth 901 with or from the second fixing teeth 3021. When the first stationary teeth 901 are engaged with the second stationary teeth 3021, the impact switch 90 may restrict the movement of the guide 302, the guide 302 is fixed with respect to the housing 10, and the power tool enters the impact mode. When the first stationary teeth 901 are separated from the second stationary teeth 3021, the guide 302 is rotatable with respect to the housing 10, and the power tool enters the non-impact mode.
As an alternative embodiment, as shown in fig. 1, 5 and 6, the detecting member 60 includes a first detecting member 601 and a second detecting member 602, one of the first detecting member 601 and the second detecting member 602 is fixed to the mode switching member 50, and the other of the first detecting member 601 and the second detecting member 602 is fixed to the housing 10, and when the mode switching member 50 is at the first position, the second detecting member 602 falls within the detection range of the first detecting member 601, and when the mode switching member 50 is at the second position, the second detecting member 602 does not fall within the detection range of the first detecting member 601. The first detecting element 601 is used for detecting the second detecting element 602, and has a certain detecting range, when the mode switching member 50 is rotated to the first position, the second detecting element 602 falls into the detecting range of the first detecting element 601, and when the mode switching member 50 is rotated to the second position, the second detecting element 602 does not fall into the detecting range of the first detecting element 601.
In this embodiment, the mode switching member 50 and the housing 10 are generally in a sleeved position relationship, and at least a portion of the mode switching member 50 is directly disposed opposite to each other, the mode switching member 50 can be sleeved outside the housing 10, and the housing 10 can also be sleeved outside the mode switching member 50. Under the condition that the housing 10 is sleeved outside the mode switching member 50, at least a part of the mode switching member 50 is exposed for the user to rotate, i.e., the housing 10 is sleeved on a part of the mode switching member 50. When the mode switch 50 is rotated, the housing 10 is fixed.
As an alternative embodiment, the housing 10 is sleeved outside the mode switching member 50, the outer side wall of the mode switching member 50 is provided with a first groove 501, the inner side wall of the housing 10 is provided with a second groove 101, one of the first detecting element 601 and the second detecting element 602 is fixed in the first groove 501, and the other is fixed in the second groove 101.
Assuming that the first detecting element 601 is fixed in the first groove 501 and the second detecting element 602 falls into the second groove 101, in the process of rotating the mode switching member 50 to the first position, the first groove 501 gradually approaches the second groove 101, so that the first detecting element 601 in the first groove 501 gradually approaches the second detecting element 602 in the second groove 101, and when the mode switching member 50 is at the first position, the second detecting element 602 in the second groove 101 falls into the detecting range of the first detecting element 601 in the first groove 501. When the mode switching member 50 is rotated to the second position, the first groove 501 gradually moves away from the second groove 101, and when the mode switching member 50 is at the second position, the second detecting element 602 in the second groove 101 does not fall within the detecting range of the first detecting element 601 in the first groove 501.
Similarly, when the first detecting element 601 is fixed in the second recess 101 and the second detecting element 602 is fixed in the first recess 501, the second detecting element 602 in the first recess 501 falls within the detecting range of the first detecting element 601 in the second recess 101 when the mode switching member 50 is at the first position. When the mode switching member 50 is rotated to the second position, the first groove 501 gradually moves away from the second groove 101, and when the mode switching member 50 is at the second position, the second detecting element 602 in the first groove 501 does not fall within the detecting range of the first detecting element 601 in the second groove 101.
Of course, the first detecting member 601 and the second detecting member 602 may be fixed to the mode switching member 50 or the housing 10 by other means, and are not limited to the manner of providing the groove.
In an alternative embodiment, the first detecting element 601 is a hall sensor, and the second detecting element 602 is a magnet. The hall sensor is a magnetic field sensor manufactured according to the hall effect, an electrical parameter (for example, voltage) output by the hall sensor changes with the change of the magnetic field strength, and the magnetic field strength sensed by the hall sensor when the mode switching member 50 is at the first position is different from the magnetic field strength sensed by the hall sensor when the mode switching member 50 is at the second position, so that the output electrical parameter is also different, and the position of the mode switching member 50 is detected accordingly.
As a variant, the first detection element 601 may be a proximity sensor and the second detection element 602 a magnet. The principle of the proximity sensor is similar to that of a hall sensor and is not described in detail herein.
As another variation, the first detecting element 601 is an optical sensor and the second detecting element 602 is an optical identification code. The optical sensor can be a laser sensor, and the optical identification code can be a concave-convex structure arranged at a plurality of intervals. When the mode switching member 50 is located at the first position, and the laser emitted by the laser sensor can irradiate the concave-convex structure, the distances from the laser to the convex surface and the concave surface are different, so that the distance signals reflected by the optical identification code received by the laser sensor are regularly different, and the optical identification code can be detected. When the mode switching member 50 is at the second position, the reflected signal received by the laser sensor does not have the above-mentioned characteristics, and the position of the mode switching member 50 is detected accordingly.
It should be noted that there may be various structures of the optical identification code, for example, the blocks are arranged at black and white intervals, or the surface of one of the two adjacent blocks is arranged as an inclined surface, which may affect the signal received by the laser sensor.
It should be noted that the first detection element 601 and the second detection element 602 are not limited to the above embodiments, and other elements capable of achieving the same function are applicable to the present application.
The following describes the starting process of the electric tool:
rotating the mode switching member 50 to a desired position, pressing the trigger switch 300, communicating the controller 70 with the battery 200, powering on the controller 70, simultaneously powering on the motor 20 by the controller 70, detecting the position of the mode switching member 50 by the detecting member 60, and sending the position information to the controller 70, judging the position information by the controller 70, when the mode switching member 50 is at the first position, that is, the electric tool is in the impact mode, sending a control signal to the motor 20 by the controller 70, so that the initial duty ratio of the motor 20 (that is, the motor duty ratio corresponding to the minimum stroke amount of the trigger switch, hereinafter, referred to as the initial duty ratio) is adjusted to a preset value larger than zero, and starting the motor 20.
As an optional implementation, the preset value is less than or equal to 50%. Further preferably, the preset value is set to 50%, and when the initial duty ratio of the motor is set to 50%, the motor can provide enough driving force to drive the spindle to reciprocate, and meanwhile, the driving force of the motor can not damage the load.
As shown in fig. 7, in practical applications, the stroke amount of the trigger switch 300 and the duty ratio of the motor 20 generally have a linear relationship, and as the stroke amount of the trigger switch 300 increases, the duty ratio of the motor 20 increases linearly. In fig. 7, taking the preset value as 50% as an example, when the electric tool is in the impact mode, the duty ratio of the motor 20 corresponding to the minimum stroke amount of the trigger switch 300 is 50%, and the duty ratio of the motor 20 is linearly increased from 50% to 100% in the process of increasing the stroke amount from 0 to L. When the electric tool is in the non-impact mode, the duty ratio of the motor 20 corresponding to the minimum stroke amount of the trigger switch 300 is 0, and the duty ratio of the motor 20 is linearly increased from 0 to 100% in the process of increasing the stroke amount from 0 to L.
It should be noted that, the relationship between the trigger switch stroke amount and the motor duty ratio may also be a nonlinear relationship, and may be set according to actual requirements, which is not limited herein.
Of course, the initial duty cycle of the motor 20 may also be adjusted to be greater than 50%, for example, 60%, 65%, 70%, etc., and the preset value may be set according to actual requirements. The duty cycle of the motor 20 is increased, namely, the rotating speed of the motor 20 is increased, the power is increased, the torque is increased, and further, when the electric tool is in an impact mode, the motor 20 can provide enough driving force to form the impact on the main shaft 40 along the axial direction of the main shaft 40 when the stroke of the trigger switch 300 is small, so that the quick hammer starting is realized, and the working efficiency of the electric tool is improved.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (8)
1. A power tool having an impact mode and a non-impact mode, the power tool comprising:
a housing;
a trigger switch;
the main shaft is arranged in the shell, and the end part of the main shaft is provided with a tool head;
the motor is arranged in the shell and used for providing driving force;
the impact mechanism can drive the main shaft to reciprocate along the axial direction of the main shaft by using the driving force of the motor in the impact mode;
a mode switch operable to move between a first position and a second position, the power tool being in an impact mode when the mode switch is in the first position, the power tool being in a non-impact mode when the mode switch is in the second position;
a detecting member for detecting a current position of the mode switching member;
the controller is respectively electrically connected with the detection piece, the trigger switch and the motor, and controls the duty ratio of the motor according to the stroke quantity of the trigger switch;
the controller is further configured to adjust a motor duty ratio corresponding to the minimum stroke amount of the trigger switch to a preset value larger than zero when the current position of the mode switching piece detected by the detection piece is judged to be the first position.
2. The electric power tool according to claim 1, wherein the detection member includes a first detection member and a second detection member, one of the first detection member and the second detection member is fixed to the mode switching member, and the other of the first detection member and the second detection member is fixed to the housing, and the second detection member falls within a detection range of the first detection member when the mode switching member is at the first position and does not fall within the detection range of the first detection member when the mode switching member is at the second position.
3. The power tool of claim 2, wherein the housing is disposed outside the mode switch, a first groove is disposed on an outer side wall of the mode switch, a second groove is disposed on an inner side wall of the housing, one of the first detecting element and the second detecting element is fixed in the first groove, and the other of the first detecting element and the second detecting element is fixed in the second groove.
4. The power tool of claim 2, wherein the first sensing element is a hall sensor and the second sensing element is a magnet.
5. The power tool of claim 2, wherein the first sensing element is a proximity sensor and the second sensing element is a magnet.
6. The power tool of claim 2, wherein the first sensing element is an optical sensor and the second sensing element is an optical identification code.
7. The power tool of claim 6, wherein the optical sensor is a laser sensor and the optical identification code is a plurality of spaced apart raised and recessed structures.
8. The power tool of claim 1, wherein the preset value is less than or equal to 50%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922147730.5U CN211517387U (en) | 2019-12-04 | 2019-12-04 | Electric tool |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922147730.5U CN211517387U (en) | 2019-12-04 | 2019-12-04 | Electric tool |
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| CN211517387U true CN211517387U (en) | 2020-09-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112894724A (en) * | 2019-12-04 | 2021-06-04 | 苏州宝时得电动工具有限公司 | Electric tool and control method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112894724A (en) * | 2019-12-04 | 2021-06-04 | 苏州宝时得电动工具有限公司 | Electric tool and control method thereof |
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