CN116922458A - Shearing opening control method of electric shearing tool - Google Patents
Shearing opening control method of electric shearing tool Download PDFInfo
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- CN116922458A CN116922458A CN202310886484.3A CN202310886484A CN116922458A CN 116922458 A CN116922458 A CN 116922458A CN 202310886484 A CN202310886484 A CN 202310886484A CN 116922458 A CN116922458 A CN 116922458A
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- 238000010008 shearing Methods 0.000 title claims abstract description 103
- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000001939 inductive effect Effects 0.000 claims abstract description 33
- 238000011895 specific detection Methods 0.000 claims description 43
- 230000033001 locomotion Effects 0.000 claims description 23
- 230000010355 oscillation Effects 0.000 claims description 20
- 230000002441 reversible effect Effects 0.000 claims description 11
- 230000003068 static effect Effects 0.000 claims description 11
- 239000004020 conductor Substances 0.000 claims description 10
- 230000035699 permeability Effects 0.000 claims description 10
- 238000005520 cutting process Methods 0.000 claims description 8
- 238000006073 displacement reaction Methods 0.000 claims description 7
- 230000000903 blocking effect Effects 0.000 claims description 4
- 230000004044 response Effects 0.000 claims description 4
- 230000036961 partial effect Effects 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 238000013459 approach Methods 0.000 claims 1
- 238000009434 installation Methods 0.000 abstract description 8
- 230000000875 corresponding effect Effects 0.000 description 19
- 230000008859 change Effects 0.000 description 11
- 238000001514 detection method Methods 0.000 description 7
- 238000013138 pruning Methods 0.000 description 7
- 230000002829 reductive effect Effects 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 5
- 230000005355 Hall effect Effects 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
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- 238000006243 chemical reaction Methods 0.000 description 3
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- 230000000670 limiting effect Effects 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
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- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000005357 Hall field Effects 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 229910001053 Nickel-zinc ferrite Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
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- 235000011389 fruit/vegetable juice Nutrition 0.000 description 1
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Classifications
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G3/00—Cutting implements specially adapted for horticultural purposes; Delimbing standing trees
- A01G3/02—Secateurs; Flower or fruit shears
- A01G3/033—Secateurs; Flower or fruit shears having motor-driven blades
- A01G3/037—Secateurs; Flower or fruit shears having motor-driven blades the driving means being an electric motor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
- B26B25/00—Hand cutting tools involving disc blades, e.g. motor-driven
- B26B25/002—Motor-driven knives with a rotating annular blade
Abstract
The application discloses a shearing opening control method of an electric shearing tool, which relates to the technical field of electric shearing tools, and comprises the following steps that firstly, a movable blade stroke control piece changes the relative position of an inductive sensor and a trigger piece; secondly, generating corresponding inductance by the inductance sensor; thirdly, the control processor obtains the inductance of the inductive sensor, judges the current relative position of the trigger piece and the inductive sensor, and correspondingly outputs a control signal to the electric driving assembly; and fourthly, the electric driving assembly drives the blade to reach the designated position, and the relative position information of the current trigger piece and the inductive sensor can be obtained after the control processor judges the inductive quantity because the increase and the decrease of the inductive quantity are linear, so that the position of the blade is mapped to the position of the control blade, the correspondence between the position of the blade and the blade stroke control piece is realized, and the inductive sensor and the trigger piece are adopted as control, so that the installation convenience is improved better.
Description
The present application claims priority to a "method for controlling the shearing opening of an electric shearing tool" of chinese patent application No. [ CN202211074536.9 ] filed on month 09 and 03 of 2022, which is incorporated by reference in its entirety.
Technical Field
The application relates to the technical field of electric shearing tools, in particular to a shearing opening control method of an electric shearing tool.
Background
The existing electric pruning shear blade position control is mainly realized by using a Hall device induction magnet mode based on a Hall effect. The working principle is as follows: the hall effect is the deflection of a charged particle, which is essentially a motion, caused by the lorentz force in a magnetic field. When charged particles (electrons or holes) are confined in a solid material, this deflection causes a positive and negative charge accumulation in the vertical current and magnetic field direction, thus creating an additional transverse electric field, i.e., a hall field. The distance between the trigger magnet and the Hall device can be judged by detecting the electromotive force of the electric field through the modern technology, so that the positions of the pruning shear trigger and the blade are correlated, and the control of the position of the pruning shear blade is realized.
Due to the linear hall effect IC, it responds in proportion to the magnetic flux density. As shown in fig. 1, it is assumed that the signal output range of the linear hall device is 0V to Vout. When no magnetic field is present, the analog output drives the loop as Vout. The north-south magnetic poles induce unique voltages, so that the S pole or N pole of the magnet needs to be confirmed when the linear Hall device is installed after the type selection is determined. Therefore, the conventional electric pruning shears using the hall element sensing magnet as the means of blade position control are not preferable in terms of convenience of installation, and the control portion thereof is to be improved.
Disclosure of Invention
The application aims to overcome the defects of the prior art and provides a technical scheme capable of solving the problems.
In order to achieve the above purpose, the present application provides the following technical solutions: a shearing opening control method of an electric shearing tool comprises the following steps of
The first step, the movable blade stroke control member, the blade stroke control member is enabled to conduct forward movement, reverse movement or alternate movement between the forward movement and the reverse movement in a prescribed route, and the relative position of the inductive sensor and the trigger member is enabled to be changed;
secondly, generating corresponding inductance by the inductive sensor according to the relative position of the trigger piece;
thirdly, the control processor obtains the inductance of the inductive sensor, judges the current active position of the blade stroke control member according to the inductance, judges the current relative position of the trigger piece and the inductive sensor, and outputs a control signal corresponding to the position of the blade stroke control member to the electric driving piece of the electric driving assembly according to the judged position information;
and fourthly, the electric driving assembly drives the blade to reach the designated position, and the shearing opening degree formed by the first blade and the second blade is changed.
As a further scheme of the application:
the inductive sensor is a hollow annular inductor or an inductance coil arranged on the electric shearing tool main body, and the trigger piece is a magnetizer arranged on the blade stroke control piece; or the inductive sensor is an air-core annular inductor or an inductance coil arranged on the blade stroke control element, and the trigger piece is a magnetizer arranged on the electric shearing tool body;
when the blade stroke control member moves forward along a specified route, the magnetizer is in a moving state of being inserted into the hollow annular inductor or the inductance coil; when the blade stroke control member moves reversely in a prescribed route, the magnetizer is in a moving state of being separated from the hollow annular inductor or the inductance coil; or when the blade stroke control member moves forward along a specified route, the magnetizer is in a moving state of being separated from the hollow annular inductor or the inductance coil; when the blade travel control member moves reversely in a prescribed path, the magnetizer is in a moving state of being inserted into the hollow annular inductor or the inductance coil.
As a further scheme of the application: the control processor is provided with an oscillating circuit matched with the air-core annular inductor or the inductance coil, the air-core annular inductor or the inductance coil is correspondingly converted into an oscillating frequency according to the inductance quantity generated by the relative position of the magnetizer, and the oscillating frequency is correspondingly changed by changing the displacement of the magnetizer; outputting a frequency within a specific detection frequency band in response to a specific displacement amount of the magnetic conductor of a specific magnetic permeability while moving the blade stroke control member; and the control processor receives the frequency in the specific detection frequency band and correspondingly controls and outputs the shearing opening corresponding to the frequency.
As a further scheme of the application: all frequency point information of a specific detection frequency band is prestored in a memory of the control processor, and each frequency point corresponds to a shearing opening; after receiving the oscillation frequency, the control processor firstly determines whether the received oscillation frequency is located in the specific detection frequency band, and if the received oscillation frequency is located in the specific detection frequency band, the control processor compares the received oscillation frequency to obtain corresponding shearing opening information and correspondingly controls and outputs the corresponding shearing opening.
As a further scheme of the application: after receiving the oscillation frequency, the control processor firstly determines whether the received oscillation frequency is located in the specific detection frequency band, and if not, the control processor correspondingly does not output the shearing angle control or maintains the current shearing angle control.
As a further scheme of the application: the specific detection frequency band is a low frequency band.
As a further scheme of the application: the device is provided with a static working frequency used for representing the influence of external impurities, and the frequency of the specific detection frequency band is smaller than the static working frequency.
As a further scheme of the application: the specific detection frequency band is 40KHz-55KHz, and the frequency of the specific detection frequency band is reduced when the shearing opening is gradually reduced.
As a further scheme of the application: the blade travel control is a trigger rotatably disposed on the power shear tool body.
As a further scheme of the application: the trigger moves in a direction that the magnetizer is separated from the hollow annular inductor or the inductance coil according to a specified route, and when the magnetizer reaches a terminal point, the magnetizer is close to an opening of the hollow annular inductor or the inductance coil, and a state of partially blocking the opening is formed; the partial blocking of the opening by the magnetizer meets the following conditions: debris having a cross section greater than or equal to the cross section of the magnetizer cannot pass through the opening.
Compared with the prior art, the application has the following beneficial effects:
according to the shearing opening control method, the variable inductance of the inductance type sensor is obtained through the relative position change of the trigger piece and the inductance type sensor, and the relative position information of the current trigger piece and the inductance type sensor can be obtained after the control processor judges the inductance quantity because the increase and the decrease of the inductance are linear, so that the relative position information is mapped to the position of the control blade, and the blade position corresponds to the blade stroke control piece;
through the linear change of inductance value, control processor can comparatively accurately obtain the relative position information of trigger piece and inductance type sensor, obtains the position information of blade stroke control spare, and every position point can all map to the position of current blade, and adopts inductance type sensor and trigger piece as control detection, when the installation, can avoid: the current linear Hall device selects the type and confirms the S pole or the N pole of magnet when the installation after confirming, can influence production efficiency' S problem, and the installation convenience is better.
Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the application, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic diagram of a linear variation of a conventional linear Hall effect;
FIG. 2 is a flow chart of a method of controlling shear opening according to the present application;
FIG. 3 is a schematic view of the internal structure of the electric shear tool according to the present application;
FIG. 4 is a schematic view of another internal structure of the power tool of the present application;
FIG. 5 is a schematic circuit diagram of a signal conditioning circuit according to the present application;
FIG. 6 is a diagram showing an example of waveform change corresponding to the signal conditioning circuit according to the present application;
FIG. 7 is a flow chart of the present application for converting frequencies for output;
FIG. 8 is a flow chart of the shear angle control of the receive frequency in the present application;
fig. 9 is a schematic circuit diagram of an oscillating circuit in the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Referring to fig. 2-9, a method for controlling a shearing opening of an electric shearing tool includes
The first step, the movable blade stroke control member, the blade stroke control member is enabled to conduct forward movement, reverse movement or alternate movement between the forward movement and the reverse movement in a prescribed route, and the relative position of the inductive sensor and the trigger member is enabled to be changed;
secondly, generating corresponding inductance by the inductive sensor according to the relative position of the trigger piece;
thirdly, the control processor obtains the inductance of the inductive sensor, judges the current active position of the blade stroke control member according to the inductance, judges the current relative position of the trigger piece and the inductive sensor, and outputs a control signal corresponding to the position of the blade stroke control member to the electric driving piece of the electric driving assembly according to the judged position information;
and fourthly, the electric driving assembly drives the blade to reach the designated position, and the shearing opening degree formed by the first blade and the second blade is changed.
According to the shearing opening control method, the variable inductance of the inductance type sensor is obtained through the relative position change of the trigger piece and the inductance type sensor, and the relative position information of the current trigger piece and the inductance type sensor can be obtained after the control processor judges the inductance quantity because the increase and the decrease of the inductance are linear, so that the relative position information is mapped to the position of the control blade, and the blade position corresponds to the blade stroke control piece;
through the linear change of inductance value, control processor can comparatively accurately obtain the relative position information of trigger piece and inductance type sensor, obtains the position information of blade stroke control spare, and every position point can all map to the position of current blade, and adopts inductance type sensor and trigger piece as control detection, when the installation, can avoid: the current linear Hall device selects the type and confirms the S pole or the N pole of magnet when the installation after confirming, can influence production efficiency' S problem, and the installation convenience is better.
Preferably, the control processor obtains the inductance of the inductive inductor in real time.
The following electric shear tool can be innovated based on the above-described shear opening control method, or it can be understood that the above-described shear opening control method is innovated based on the following electric shear tool. The settings of the electric shearing tool are as follows:
the utility model provides an electric shear tool, includes electric shear tool main part 1, is provided with on the electric shear main part 1:
the first blade 2 and the second blade 3 are matched with each other to cut, and the first blade 2 and the second blade 3 are matched with each other to cut objects (such as branches) to be cut;
an electric drive unit 4, wherein the electric drive unit 4 drives at least one blade (a first blade and a second blade) for adjusting the shearing opening degree formed by the first blade 2 and the second blade 3;
a blade stroke control member 5, the blade stroke control member 5 being reciprocally movable in a prescribed path, forming a forward movement and a reverse movement;
a trigger 6;
an inductive sensor 7;
a control processor 8, configured to receive an inductance generated by the inductance sensor 7, and control a driving distance and a driving direction of the electric driving assembly 4 to the blade according to the inductance;
when the blade stroke control member 5 moves along a predetermined path, the blade stroke control member 5 drives the trigger member 6 or the inductive sensor 7, so that the relative position of the trigger member 6 and the inductive sensor 7 changes, and the inductive sensor 7 senses the change of the inductance generated by the trigger member 6.
Preferably, the electric shearing tool main body is further provided with a transmission (not shown), the blade stroke control element corresponds to an output end of the transmission, a user operating element is arranged at an input end of the transmission, when a user operates the user operating element in a pushing, rotating, buckling or other mode, the transmission correspondingly enables the blade stroke control element to move through mechanical transmission, and the response of the blade stroke control element is changed through the transmission (such as increasing the movement range or reducing the movement range), so that the user can control the shearing opening to a required opening size more easily.
The electric driving part of the electric driving assembly 4 is usually a motor, and the motor outputs power, so that the corresponding blade can finally perform forward movement and reverse movement through forward and reverse rotation of the motor. The motor may drive only one blade, or the motor may drive both blades simultaneously. When the motor drives the blade, the power output by the motor can finally reach the blade after passing through the gearbox 11, so as to achieve the change of moment, speed or direction.
When the motor driving assembly 4 only drives one blade: if the driven blade is the first blade 2, the first blade 2 is correspondingly a moving blade, the second blade 3 is correspondingly a fixed blade, the second blade 3 is mounted on the electric shearing tool main body 1, the first blade 2 can be driven by the electric driving component 4 to rotate, for example, the first blade is rotatably arranged on the electric shearing tool main body through a rotating shaft, or the first blade is rotatably sleeved on a rotating shaft on the electric shearing tool main body, or the first blade is connected to a power output shaft, and the power output shaft can be an output shaft of a motor or an output shaft of a gearbox.
The electric driving part of the electric driving assembly 4 can also be an electric push rod, an air cylinder, a hydraulic cylinder, an electric spindle and the like with forward and reverse driving functions.
The inductance sensor 7 may be a conventional variable gap inductance sensor, a variable area inductance sensor, or a solenoid iron-inserted inductance sensor.
The blade travel control 5 may be movable in the following manner: pressing, such as a key with a reset function; push-type, such as sliding sleeves and sliding push rods; rotary, such as a trigger, knob, rotatable grip, etc.
The specific moving mode of the blade stroke control member of the electric shearing tool and the specific setting of the inductive sensor can be arbitrarily matched from the scheme listed above and the similar scheme which can be directly obtained, and one embodiment of the matched electric shearing tool can be shown in fig. 3-4:
the blade travel control member is a trigger 501 rotatably provided on the electric shear tool body 1, the inductance sensor is an air-core toroidal inductor or inductor 701 mounted on the electric shear tool body 1, the trigger member is a magnetizer 601 mounted on the trigger, and when the trigger 501 rotates: the magnetizer 601 is in a moving state of being inserted into the hollow annular inductor or the inductance coil 701; or the magnetizer 601 is in a moving state of being separated from the hollow toroidal inductor or the inductor coil 701.
When the trigger 501 is pulled down, the magnetizer 601 is driven by the rotating trigger 501, so that the relative position of the magnetizer 601 and the hollow annular inductor or the inductance coil 701 is changed, the inductance generated by the hollow annular inductor or the inductance coil 701 is changed, the control processor 8 obtains the inductance of the hollow annular inductor or the inductance coil 701, judges the current rotation position of the trigger 501 according to the inductance, judges the relative position of the magnetizer 601 and the hollow annular inductor or the inductance coil 701, and outputs a control signal corresponding to the position of a blade stroke control member (namely, drives the blade to a corresponding position) to an electric driving member of the electric driving assembly 4, thereby adjusting the shearing opening 100 formed by the first blade 2 and the second blade 3 to a corresponding opening.
The relative position of the magnetizer 601 and the air-core toroidal inductor or inductor 701 is changed as:
1) When the blade travel control member moves forward along a prescribed path, the magnetizer 601 is in a moving state of being inserted into the hollow toroidal inductor or the inductor coil 701; when the blade travel control member moves reversely in a prescribed path, the magnetizer 601 is in a moving state of being separated from the hollow annular inductor or the inductance coil 701;
or (b)
2) When the blade stroke control member moves forward along a prescribed path, the magnetizer 601 is in a moving state of being separated from the hollow annular inductor or the inductance coil 701; when the blade stroke control member is moved in the reverse direction by a predetermined route, the magnetizer 601 is moved to be inserted into the air-core toroidal inductor or the inductor coil 701.
The aforementioned blade travel control member is movable in a prescribed path, and in this embodiment, it can be understood that: the trigger 501 is rotated with the electric shear tool body 1 as a support, and the forward movement may be the direction of rotation of the trigger when the trigger is pulled.
As one of the shearing opening adjusting operations, when the trigger 501 is pulled down, the shearing opening of the first blade 2 and the second blade 3 becomes smaller, that is, a shearing state of the object to be sheared is exhibited.
The magnetizer is preferably a magnetic core or a metal piece with high magnetic permeability such as iron, nickel, manganese and the like.
Preferably, the electric shearing tool is further provided with an elastic member 9, the elastic member 9 corresponds to the trigger 501, when the user pulls down the trigger 501, the elastic member 9 is stressed by the trigger 501 to elastically deform, when the user releases the trigger 501, the elastic member 9 is restored by elastic deformation to drive the trigger 501 to automatically reset, and the elastic member can adopt elastic articles such as a pressure spring, a tension spring, a torsion spring, a shrapnel and the like.
Likewise, as the same or similar embodiments, the mounting location of the magnetizer 601 and the mounting location of the air-core toroidal inductor or inductor 701 may be interchanged, namely: the magnetizer 601 is mounted on the electric shearing tool body 1, and the hollow toroidal inductor or inductor 701 is mounted on the trigger 501.
In this embodiment, in order to enable the control processor 8 to obtain the inductance information of the air-core toroidal inductor or the inductance coil 701 more accurately, the control processor (MCU) is provided with a signal conditioning circuit, the signal conditioning circuit includes a second-order integrating circuit, a detecting circuit and an operational amplifier, the second-order integrating circuit is used for converting a square wave into a sine wave, and the positive and negative amplitudes of the sine wave change with the inductance change of the inductance sensor, the detecting circuit is used for converting the sine wave converted by the second-order integrating circuit into a relatively stable direct current voltage, the operational amplifier is used for amplifying the direct current voltage obtained by the detecting circuit, and finally, the direct current voltage is input to the control processor (MCU) for sampling and AD conversion, and the control processor (MCU) determines the relative position of the magnetizer and the air-core toroidal inductor or the inductance coil more accurately. Waveform changes referring to fig. 6, it should be noted that the waveform changes shown in fig. 6 are to be understood as examples, and the waveform changes may be deformed accordingly with changes in frequency, amplitude, etc.
As shown in fig. 5, the second-order integrating circuit includes a resistive load R2, a resistive load R8, and a capacitive load C5, and the detection circuit includes a diode D2, a resistive load R7, and a capacitive load C4. Taking a square wave with a frequency of 1Mhz, an amplitude of 5V, and a duty cycle of 50% as an example, the input from the H PWM terminal: the resistive load R2, the resistive load R8 and the capacitive load C5 are matched with the hollow annular inductor or the inductance coil (J1 in fig. 5) to convert the square wave into a sine wave, the positive and negative amplitude values of the sine wave change along with the change of the inductance value of the hollow annular inductor or the inductance coil, and when the inductance value of the hollow annular inductor or the inductance coil is increased, the amplitude value of the sine wave is reduced; the diode D2 is in a micro-conduction state, the sine wave obtained through conversion passes through the detection circuit and becomes relatively stable direct current voltage, and the direct current voltage follows the amplitude of the positive period of the sine wave; finally, the weak direct-current voltage output by the detection circuit enters an AMP0 operational amplifier, and the direct-current voltage is amplified by the AMP0 operational amplifier and then is input into a control processor (MCU) for sampling and AD conversion.
Referring specifically to fig. 7-9, in this embodiment, in order to enable the reliability and stability of the inductive sensor to be in a better state when the inductive sensor is applied to control of the shearing opening of the electric shearing tool, and to better adapt to the control of the shearing opening:
the control processor is provided with an oscillating circuit matched with the air-core annular inductor or the inductance coil, the air-core annular inductor or the inductance coil is correspondingly converted into an oscillating frequency according to the inductance quantity generated by the relative position of the magnetizer, and the oscillating frequency is correspondingly changed by changing the displacement of the magnetizer; outputting a frequency within a specific detection frequency band in response to a specific displacement amount of the magnetic conductor of a specific magnetic permeability while moving the blade stroke control member; and the control processor receives the frequency in the specific detection frequency band and correspondingly controls and outputs the shearing opening corresponding to the frequency.
According to an inductance value calculation formula:
L＝N²μA/l
wherein L is inductance, N is number of turns of coil, mu is magnetic permeability of the magnetizer, A is cross-sectional area of the magnetizer, and L is length of coil;
as an electric shear tool capable of being used for a long time, the coil is not replaced when normally used, and the inductance is mainly determined by the magnetic permeability of the magnetic conductor, the cross-sectional area of the magnetic conductor and the depth of the magnetic conductor entering the coil in practical application, namely, when the magnetic conductor with specific cross-sectional area and specific magnetic permeability enters the coil and the distance of the magnetic conductor with specific magnetic permeability is a value in a specific range (namely, the specific displacement amount), the generated inductance is a specific inductance, and the frequency in a specific detection frequency band is obtained after the specific inductance is converted by the oscillating circuit. When the magnetic conductor is applied to electric scissors which can be held by one hand, the magnetic conductor can be cylindrical nickel-zinc ferrite with the diameter of 3 mm.
In the case of controlling the shearing opening as an electric shearing tool, particularly as an electric shearing tool for pruning, the working environment of the electric shearing tool is very complex, for example, when a piece of chips with the same magnetic permeability but different cross sections fall into a coil carelessly, or when a piece of chips with the same cross sections but different magnetic permeability fall into a coil carelessly, once the electric shearing tool is mistakenly triggered, injuries or losses are easily caused, so that a control system of the electric shearing tool is required to be capable of identifying whether the chips are entering a trigger piece or not very reliably and stably so as to reduce the occurrence of the injuries or losses. Therefore, by setting the specific detection frequency band, the control processor performs corresponding shear opening control when obtaining the frequency belonging to the specific detection frequency band, the influence of the frequency outside the specific detection frequency band on the shear opening control is eliminated, and the reliability and stability during the shear opening control are effectively improved.
The setting of the specific detection frequency and the control made by the control processor aiming at the specific detection frequency are not needed to be additionally controlled by hardware such as a coil, a magnetizer, an oscillating circuit, a control processor and the like on the premise of improving the reliability and the stability of the control, and only the corresponding setting of the control program is needed, so that the cost is reduced more easily.
Further, all frequency point information of a specific detection frequency band is pre-stored in a memory of the control processor, and each frequency point corresponds to a shearing opening; after receiving the oscillation frequency, the control processor firstly determines whether the received oscillation frequency is located in the specific detection frequency band, and if the received oscillation frequency is located in the specific detection frequency band, the control processor compares the received oscillation frequency to obtain corresponding shearing opening information and correspondingly controls and outputs the corresponding shearing opening. Further, after receiving the oscillation frequency, the control processor correspondingly does not output the shear angle control or maintains the current shear angle control if the received oscillation frequency is determined not to be within the specific detection frequency band.
The control of not outputting the shearing angle can be to restore the shearing opening to the initial angle, for example, when the initial angle is set to be opened to the maximum opening, and when the received oscillation frequency is not the frequency in the specific detection frequency band, the control processor automatically executes the control, namely, the blade is driven to restore to the initial position through the electric driving assembly, so that the shearing opening is restored to the initial maximum angle, the blade can be effectively ensured to be withdrawn and returned safely and timely, the safety is improved, the secondary damage to the human body is effectively avoided, and the secondary damage to the electric shearing tool is effectively reduced.
Preferably, the specific detection frequency band is a low frequency band, and as an electric shearing tool capable of being used for pruning, the shearing force is larger, the specific detection frequency band is arranged in the low frequency band, the number of converted pulses is moderate, the specific detection frequency is easier to count, the corresponding shearing opening is easier to accurately control, and the applicability of the inductive sensor in the control of the shearing opening of the electric shearing tool is better. More preferably, the specific detection frequency range is 40KHz-55KHz, and the frequency of the specific detection frequency range is reduced when the shearing opening is gradually reduced. For example, when the obtained frequency is 55KHz, the shearing opening is correspondingly controlled to be maximum, and when the obtained frequency is 40KHz, the shearing opening is correspondingly controlled to be minimum. The frequency band range is in the low frequency band, the linear proportion of 55KHz decreasing to 40KHz is closer to the blade proportion, the applicability is better when the frequency band is applied to the shearing opening control of the electric shearing tool, and the selection of the specific detection frequency band is more beneficial to improving the accuracy of the shearing opening control.
The device is provided with a static working frequency used for representing the influence of external impurities, and the frequency of the specific detection frequency band is smaller than the static working frequency. Preferably, the amplitude of the oscillation is a value of which the detection point is more than 150%, and the anti-interference performance is better. When the specific detection frequency band is selected to be 40KHz-55KHz, the static working frequency is preferably set to be 60KHz. The specific detection frequency band and the static working frequency have larger safety margin, and when being used for controlling the shearing opening degree of the garden electric shearing tool which can be used for pruning, common metal sundries are copper, iron and aluminum, pollutant water, water pollution, leaves, oil juice and the like, and the influence frequency band is close to the static working point, so that the influence of the common sundries can be effectively avoided through the arrangement. The setting and the selection of the specific detection frequency band and the static working frequency can ensure that the inductive sensor has better applicability and control precision when being applied to the control of the shearing opening of the electric shearing tool on one hand, and has larger safety margin when setting the static working frequency on the other hand.
As shown in fig. 9, the oscillating circuit preferably has a resistor R2 as an output current limiting resistor, and is connected to an air-core toroidal inductor or an inductor coil (J1 in fig. 9), and the detection point may be a point or B point, where a is a high-potential frequency output point, and B is a low-potential frequency output point, and frequency control is performed by PWM.
In the embodiment of the application, the blade stroke control member moves along a prescribed route in a direction that the magnetizer is separated from the hollow annular inductor or the inductance coil, and when the magnetizer reaches the end point, the magnetizer is close to the opening of the hollow annular inductor or the inductance coil, and the opening is partially blocked.
The partial blocking of the opening by the magnetizer meets the following conditions: debris having a cross section greater than or equal to the cross section of the magnetizer cannot pass through the opening.
For example, when the elastic member 9 and the trigger 501 are provided, and when the trigger is released, the elastic member drives the trigger to return, and when the trigger is released, the trigger returns correspondingly drives the magnetizer 601 to move in a direction of pulling out the air-core annular inductor or the inductance coil, so that when the trigger is released, the magnetizer moves towards the direction of pulling out the air-core annular inductor or the inductance coil, but after the trigger is completely released (the trigger is completely released), the reserved interval between the magnetizer and the opening of the air-core annular inductor or the inductance coil is kept to be a small interval, and sundries with the cross section larger than or equal to that of the magnetizer cannot pass through the small interval.
The return position of the trigger can be limited by arranging the corresponding limiting piece, so that the reserved interval between the magnetizer and the opening of the coil can be kept to be the small interval after the trigger is completely loosened (the trigger is completely returned), sundries with the cross section larger than or equal to that of the magnetizer can not pass through, the occurrence of the condition of false identification triggering is effectively avoided, and the safety is better when the trigger is applied to the shearing opening control of an electric shearing tool.
It should be noted that, in order to make the power consuming parts (such as the control processor and the electric driving part of the electric driving assembly) of the electric cutting tool obtain electricity to run normally when the electric cutting tool is manufactured, the electric cutting tool further includes a power module 10, where the power module 10 may be configured to connect with the mains supply to supply power to the power consuming parts of the electric cutting tool, and the power module 10 may also be configured to supply power to the power consuming parts of the electric cutting tool through a self-contained storage battery.
The communication between the control processor and the motor driving assembly can be wired or wireless, and the wired and wireless communication technology is a common technology and is not described in detail herein.
It will be evident to those skilled in the art that the application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (10)
1. A shearing opening control method of an electric shearing tool is characterized in that the shearing opening control method comprises the following steps of
The first step, the movable blade stroke control member, the blade stroke control member is enabled to conduct forward movement, reverse movement or alternate movement between the forward movement and the reverse movement in a prescribed route, and the relative position of the inductive sensor and the trigger member is enabled to be changed;
secondly, generating corresponding inductance by the inductive sensor according to the relative position of the trigger piece;
thirdly, the control processor obtains the inductance of the inductive sensor, judges the current active position of the blade stroke control member according to the inductance, judges the current relative position of the trigger piece and the inductive sensor, and outputs a control signal corresponding to the position of the blade stroke control member to the electric driving piece of the electric driving assembly according to the judged position information;
and fourthly, the electric driving assembly drives the blade to reach the designated position, and the shearing opening degree formed by the first blade and the second blade is changed.
2. The method for controlling a shearing opening of an electric shearing tool according to claim 1, wherein,
the inductive sensor is a hollow annular inductor or an inductance coil arranged on the electric shearing tool main body, and the trigger piece is a magnetizer arranged on the blade stroke control piece; or the inductive sensor is an air-core annular inductor or an inductance coil arranged on the blade stroke control element, and the trigger piece is a magnetizer arranged on the electric shearing tool body;
when the blade stroke control member moves forward along a specified route, the magnetizer is in a moving state of being inserted into the hollow annular inductor or the inductance coil; when the blade stroke control member moves reversely in a prescribed route, the magnetizer is in a moving state of being separated from the hollow annular inductor or the inductance coil; or when the blade stroke control member moves forward along a specified route, the magnetizer is in a moving state of being separated from the hollow annular inductor or the inductance coil; when the blade travel control member moves reversely in a prescribed path, the magnetizer is in a moving state of being inserted into the hollow annular inductor or the inductance coil.
3. The method for controlling the shearing opening of an electric shearing tool according to claim 2, wherein,
the control processor is provided with an oscillating circuit matched with the air-core annular inductor or the inductance coil, the air-core annular inductor or the inductance coil is correspondingly converted into an oscillating frequency according to the inductance quantity generated by the relative position of the magnetizer, and the oscillating frequency is correspondingly changed by changing the displacement of the magnetizer;
outputting a frequency within a specific detection frequency band in response to a specific displacement amount of the magnetic conductor of a specific magnetic permeability while moving the blade stroke control member;
and the control processor receives the frequency in the specific detection frequency band and correspondingly controls and outputs the shearing opening corresponding to the frequency.
4. The method for controlling the shearing opening of an electric shearing tool according to claim 3, wherein,
all frequency point information of a specific detection frequency band is prestored in a memory of the control processor, and each frequency point corresponds to a shearing opening;
after receiving the oscillation frequency, the control processor firstly determines whether the received oscillation frequency is located in the specific detection frequency band, and if the received oscillation frequency is located in the specific detection frequency band, the control processor compares the received oscillation frequency to obtain corresponding shearing opening information and correspondingly controls and outputs the corresponding shearing opening.
5. The method for controlling a shearing opening of an electric shearing tool as recited in claim 4, wherein,
after receiving the oscillation frequency, the control processor firstly determines whether the received oscillation frequency is located in the specific detection frequency band, and if not, the control processor correspondingly does not output the shearing angle control or maintains the current shearing angle control.
6. The method for controlling a shearing opening of an electric shearing tool according to any one of claims 3 to 5, wherein said specific detection frequency band is a low frequency band.
7. The method according to claim 6, wherein a static operating frequency for representing an influence of foreign matter is provided, and the frequency of the specific detection frequency band is smaller than the static operating frequency.
8. The method for controlling the shearing opening of an electric shearing tool as recited in claim 7, wherein said specific detection frequency band is 40KHz-55KHz, and the frequency of the specific detection frequency band is shown to decrease when the shearing opening is gradually decreased.
9. A method of controlling a cutting opening of a power cutting tool according to claim 2 or 3 or 4 or 5 or 7 or 8, wherein the blade stroke control member is a trigger rotatably provided on the power cutting tool body.
10. The method according to claim 9, wherein the trigger is moved in a predetermined path so that the magnetizer is separated from the air-core toroidal inductor or the inductor, and when the magnetizer reaches the end point, the magnetizer approaches to the opening of the air-core toroidal inductor or the inductor, and the opening is partially blocked;
the partial blocking of the opening by the magnetizer meets the following conditions: debris having a cross section greater than or equal to the cross section of the magnetizer cannot pass through the opening.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020230112051A KR20240032642A (en) | 2022-09-03 | 2023-08-25 | Signal generator based on inductance characteristics of element, electric shearing tool, and shear opening degree control method for electric shearing tool |
| EP23193445.6A EP4331787A3 (en) | 2022-09-03 | 2023-08-25 | Signal generator based on inductance characteristics of element, electric shearing tool, and shear opening degree control method for electric shearing tool |
| JP2023138951A JP2024035813A (en) | 2022-09-03 | 2023-08-29 | Signal generator, electric cutting tool, and cutting opening control method for electric cutting tool based on inductance characteristics of device |
| US18/459,007 US20230403984A1 (en) | 2022-09-03 | 2023-08-30 | Signal generator based on inductance characteristics of element, electric shearing tool, and shear opening degree control method for electric shearing tool |
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|---|---|---|---|
| CN202211074536.9A CN115362841A (en) | 2022-09-03 | 2022-09-03 | Shearing opening degree control method of electric shearing tool |
| CN2022110745369 | 2022-09-03 |
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| CN116922458A true CN116922458A (en) | 2023-10-24 |
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| CN202211074536.9A Pending CN115362841A (en) | 2022-09-03 | 2022-09-03 | Shearing opening degree control method of electric shearing tool |
| CN202310886484.3A Pending CN116922458A (en) | 2022-09-03 | 2023-07-19 | Shearing opening control method of electric shearing tool |
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| CN117256339A (en) * | 2023-11-14 | 2023-12-22 | 东莞市嘉航实业有限公司 | Medium and long distance shearing device and control method |
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| CN115362841A (en) * | 2022-09-03 | 2022-11-22 | 东莞市嘉航实业有限公司 | Shearing opening degree control method of electric shearing tool |
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