CN105082261A - Chain saw and control method thereof - Google Patents
Chain saw and control method thereof Download PDFInfo
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- CN105082261A CN105082261A CN201410201684.1A CN201410201684A CN105082261A CN 105082261 A CN105082261 A CN 105082261A CN 201410201684 A CN201410201684 A CN 201410201684A CN 105082261 A CN105082261 A CN 105082261A
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Abstract
The invention relates to a chain saw. The chain saw comprises a shell, a working subassembly, a motor, at least two detection units, a processing unit, a storage unit, a comparison unit and a control unit, wherein the working subassembly stretches out of the shell along the longitudinal direction; the motor is contained in the shell and is used for driving the working subassembly to carry out cutting work; two of the at least two detection units are respectively arranged at two sides of the gravity center of the chain saw and are used for detecting a moving condition of the positions where the two detection units are located and generating detection signals; the processing unit is used for receiving the detection signals and generating an intermediate signal; the storage unit is used for storing a preset reference signal; the comparison unit is used for comparing the intermediate signal with the preset reference signal; the control unit is used for outputting a control signal to control the working subassembly to stop the cutting work under a preset condition according to a comparison result of the comparison unit.
Description
Technical field
The present invention relates to a kind of power tool, especially relate to a kind of chain saw and control method thereof.
Background technology
Chain saw, as a kind of portable cutting tool, is employed for the several scenes such as cutting timber, engraving statue.Due to high efficiency and the very strong cutting power of its cutting, and be subject to extensive welcome.According to investigation, most user uses the experience of chain saw fewer, is not very familiar to the correlative protection measure of chain saw, neither understand very much the safety operation of chain saw, causes annual improper use chain saw and the report of hurting sb.'s feelings happens occasionally.When chain saw works, the most easily produce it is a risk that be called as " recalcitrating " or " counter play " phenomenon." recalcitrate " refer to chain saw front end work package (mainly refer to around guide plate rotate chain) cut the object such as log or branch time, because the Cutting Drag running into moment is comparatively large, work package can upwards or (namely towards the direction of user) motion backward in a short period of time.Because this is (usually within 0.3 second) that occur within the extremely short time, user often has little time this reaction thus the control lost chain saw, thus causes the event of hurting sb.'s feelings.
In order to prevent the generation of this event, industry devises a kind of mechanism of Mechanical course.This mechanical mechanism covers front hand grip, is namely arranged between work package and user, and by the inertia of recoil or start a system by clashing in sharply accelerator, this system can be braked work package, thus makes it quit work.Then this controlling organization reaction is comparatively slow, is not enough to effectively stop for losing the control to chain saw.
To this, industry design electronic sensor unit detects chain saw " recalcitrating ".Because can rotate around center of rotation when chain saw produces " recalcitrating ", whether the amount of spin that electronic sensor unit can detect chain saw carrys out perception and creates " recalcitrating ".But utilize electronic sensor unit to have following problem.If electronic sensor unit arranges distance center of rotation is comparatively near, then the signal that detects of electronic sensor unit is more weak, is unfavorable for that accurate judgement " recalcitrates " generation of phenomenon.If the distance center of rotation that electronic sensor unit is arranged is comparatively far away, such as, be arranged on guide plate, then the signal that detects of electronic sensor unit is stronger, but the problem of generation is in addition more difficult installing electronic elements on guide plate, and operability is not strong.
Summary of the invention
In view of this, the invention provides a kind of control method of chain saw, it quick and precisely can identify " recalcitrating " phenomenon that chain saw produces suddenly, and can carry out correspondingly protecting effectively and timely.
For achieving the above object, the technical solution adopted in the present invention is: a kind of control method of chain saw, wherein chain saw comprises extending longitudinally and for carrying out cutting work work package, this control method comprises following rate-determining steps: detect the situation of movement of at least two positions on chain saw and send detectable signal, two positions wherein at least two positions are positioned at the both sides of chain saw center of gravity; M signal is obtained according to detectable signal logical operation; Relatively M signal and the reference signal preset; According to comparative result, control work package on a preset condition based and stop cutting work.
Preferably, logical operation comprises and carries out vector subtraction to detectable signal.
Preferably, pre-conditionedly reference signal is greater than for M signal.
Preferably, control work package to stop cutting work to comprise controlling motor quitting work
Preferably, when M signal is not more than reference signal, control work package maintenance work.
Preferably, two positions are equal to the distance of center of gravity.
Preferably, the phase difference 180 degree of two positions.
The present invention also provides a kind of chain saw performing above-mentioned control method, and it has electronic control component, quick and precisely can identify " recalcitrating " phenomenon that chain saw produces suddenly, and can carry out correspondingly protecting effectively and timely.
For achieving the above object, the technical solution adopted in the present invention is: a kind of chain saw, comprising: housing; Work package, extends longitudinally out housing; Motor, is contained in housing and for driving work package to carry out cutting work; At least two probe units, wherein two probe units are separately positioned on the both sides of the center of gravity of chain saw, for detecting the situation of movement of position and producing detectable signal; Processing unit, for receiving detectable signal and producing M signal; Memory cell, for storing default reference signal; Comparing unit, for comparing M signal and the reference signal preset; Control unit, according to the comparative result of comparing unit, exports control signal in predefined conditions and stops cutting work to control work package.
Preferably, at least two probe units are less than the beeline of work package to center of gravity to the distance of center of gravity.
Preferably, probe unit comprises the first probe unit and the second probe unit, chain saw comprises the front apron arranged near work package and the back handle arranged away from work package, and the first probe unit is arranged on front apron, and the second probe unit is arranged on back handle.
Preferably, two probe units are equal to the distance of center of gravity.
Preferably, the phase difference of two probe unit positions is 180 degree.
Preferably, M signal obtains after carrying out vector subtraction to detectable signal.
Preferably, pre-conditionedly described reference signal is greater than for described M signal.
Preferably, control signal controls described motor and quits work.
Preferably, chain saw comprises the braking mechanism with brake motor, and control signal controls braking mechanism brake motor.
Preferably, when M signal is not more than reference signal, control unit controls work package maintenance work.
Compared with prior art, beneficial effect of the present invention is: compare with reference after carrying out process by least two probe units to the result of detection of chain saw, perform corresponding actions according to different comparative results.Can identify that chain saw " recalcitrates " phenomenon and can prevent effectively and timely so more accurately.And structure is simple, cost is lower.
Accompanying drawing explanation
Above-described object of the present invention, technical scheme and beneficial effect by the detailed description that can realize specific embodiments of the invention below, can describe and clearly obtain simultaneously by reference to the accompanying drawings.
Identical label in accompanying drawing and description and symbol are for representing identical or equivalent element.
Fig. 1 is the schematic diagram of chain saw of the present invention.
Fig. 2 is the relation schematic diagram of chain saw internal electrical components of the present invention.
Schematic diagram when Fig. 3 is chain saw of the present invention generation " recalcitrating " phenomenon.
Fig. 4 is the schematic diagram of chain saw of the present invention when not producing " recalcitrating " phenomenon.
Fig. 5 is the block diagram of the control method of chain saw in Fig. 1.
1, chain saw 2, housing 3, work package
4, probe unit 5, processing unit 6, memory cell
7, comparing unit 8, control unit 21, motor
22, front apron 23, handle apparatus 31, guide plate
32, cutting element 41, the 41 ', first probe unit 42,42 ', the second probe unit
G, center of gravity W, workpiece X, detectable signal
Y, M signal
Detailed description of the invention
Below in conjunction with accompanying drawing, preferred embodiment of the present invention is described in detail, can be easier to make advantages and features of the invention be readily appreciated by one skilled in the art, thus more explicit defining is made to protection scope of the present invention.
Be illustrated in figure 1 the chain saw 1 of one embodiment of the invention.Chain saw 1 mainly comprises housing 2 and performs the work package 3 of cutting work.Housing 2 hollow is arranged, and its inside is provided with motor 21 (not shown in figure 1).Motor 21 performs work for driving work package 3.Not shown transmission mechanism is also provided with in housing 2.In preferably embodiment, housing 2 also comprises provides the handle apparatus 23 of gripping effect and the front apron 22 between handle apparatus 23 and work package 3.Front apron 22, closer to work package 3, can play certain protective action, avoids work package 3 to damage the user gripping handle apparatus 23.And handle apparatus 23 is further from work package 3.
Work package 3 extends longitudinally out housing 2.The cutting element 32 that work package 3 comprises guide plate 31 and is installed on guide plate 31.Guide plate 31 is preferably one-body molded, and guide plate 31 is equally preferably extending longitudinally.Guide plate 31 can determine a guide plate plane.In the present embodiment, the chain that cutting element 32 is formed for chain link serial connection, this chain is installed on the periphery of guide plate 31, and can rotate around this guide plate 31 with being driven.
Composition graphs 1 and Fig. 3, the most of element due to chain saw 1 all arranges in housing 2, and therefore the center of gravity G of chain saw 1 is usually located in housing 2, and away from work package 3.When producing " recalcitrating " phenomenon in chain saw cutting work, whole chain saw 1 can time compole short condition under suddenly around an axis quick rotation.This axis centroidal G and guide plate 31 place plane.Further, whole chain saw 1 can around axis one-directional rotation.Counter clockwise direction as shown in dotted arrow in Fig. 3.This be due to chain saw 1 carry out cutting work time, workpiece W is positioned at the below of work package 3.When running into larger resistance, the workpiece W assembly 3 that can push the work forward rotates counterclockwise.
As shown in Figure 2, chain saw 1 at least comprises probe unit 4, processing unit 5, memory cell 6, comparing unit 7 and control unit 8.Wherein, probe unit 4 is for detecting the situation of movement of position and producing detectable signal.And the quantity of probe unit 4 is at least two in the present invention.Particularly, probe unit 4 is arranged on chain saw regularly.When chain saw entirety produces skew (comprising various rotation or/and translation), the position also corresponding generation skew at probe unit 4 place.Namely probe unit 4 detects for carrying out in detect cycle and produces detectable signal.In various embodiments, detectable signal can have various ways.Such as angle variable quantity, other forms such as displacement variable.In preferably embodiment, detectable signal is the displacement acceleration of relative chain saw center of gravity G.And detect cycle is set in a shorter time cycle usually, be generally 0.1 second or millisecond magnitude.In the present invention, probe unit 4 comprises the first probe unit 41 and the second probe unit 42.These two probe units are separately positioned on the diverse location on chain saw, and these two diverse locations have certain space interval.Therefore the detectable signal that probe unit 4 detects represents the situation of movement of these two diverse locations.Further, these two probe units 4 are all arranged on the housing 2 of chain saw 1, and are positioned at the both sides of chain saw center of gravity G.The benefit of such setting is the situation of movement that two probe units 4 can detect center of gravity G both sides respectively, thus is beneficial to and detects " recalcitrating " phenomenon more accurately.In a preferred embodiment, because handle apparatus 23 and front apron 22 lay respectively at the both sides of center of gravity G.Therefore the first probe unit 41 can be arranged on front apron 22, and other second probe unit 42 can be arranged on handle apparatus 23.Can see like this, any one probe unit 4 is all less than the beeline of work package 3 to center of gravity G to the distance of center of gravity G.In another embodiment, two probe units 4 are separately positioned on the inside of housing 2.In addition, this two probe units 4 are equal to the distance of center of gravity G, make probe unit 4 all be positioned at on the center of gravity G same circular arc that is the center of circle like this.Further, two probe units 4 can be located along the same line with center of gravity G, are namely symmetrical arranged about center of gravity G.In other words, the phase difference of these two probe unit 4 positions is 180 degree.In other implementations, the quantity of probe unit 4 also can be not limited to 2, can be more than 2 situations.
In various embodiments, probe unit 4 can be MEMS (MEMS) sensor, such as accelerometer and/or gyro meter.Accelerometer is used for detecting the acceleration situation of chain saw, because chain saw can produce larger acceleration when producing " recalcitrating " phenomenon.Therefore accelerometer effectively can detect this acceleration situation.And in other implementations, gyro meter may be used for detecting the rolling of chain saw, pitching, depart from or around the rotary speed of chain saw longitudinal axis.In addition, probe unit 4 also can be condenser type or voltage-type sensor, for detection speed change, pressure change, voltage, electric current etc.In addition in order to easy for installation, probe unit 4 can only for detecting a direction, the direction be rotated about axis when this direction is chain saw generation " recalcitrating ".Particularly, counter clockwise direction as shown in Figure 3.Namely probe unit 4 detects the acceleration of this anticlockwise tangential direction.In other embodiments, probe unit 4 also can detect the acceleration in the direction being three-dimensional three normal axis.
Chain saw 1 also comprises the processing unit 5 for receiving detectable signal.Processing unit 5 is arranged on the inside of chain saw 1, and is electrically connected probe unit 4.In other implementations, probe unit 4 and processing unit 5 also can Integrated designs.Processing unit 5 can be a microprocessor.Processing unit 5 is for receiving detectable signal and producing M signal.The process of process comprises carries out logical operation process to detectable signal.Logical operation can comprise the various ways such as addition subtraction multiplication and division, differentiate, integration.In the present invention, logical operation is vector subtraction computing.Certainly, logical operation can include the combination not limitting the above-mentioned a series of computings enumerated.After logical operation is disposed, namely the result of logical operation is converted into M signal.Therefore M signal contains the information of logic operation result.In the present embodiment, the number of M signal is one, and the quantity due to probe unit 4 is two, so detectable signal is also two.In other examples, the quantity of such as probe unit 4 is more than three or three, then processing unit 5 can be weighted process acquisition according to the detectable signal of the plurality of probe unit 4.More specifically, such as, according to its weight, overlap-add procedure is carried out to the acceleration of two probe unit relative CG, and then carry out vector subtraction process with other probe unit and obtain M signal.
Chain saw 1 also comprises the memory cell 6 of the reference signal preset for storage one.Memory cell 6 can with probe unit 4 and/or processing unit 5 Integrated design.Memory cell 6 is mainly used to store data, such as reference signal.When needs, other elements can call the data deposited in memory cell 6.And the quantity storing reference signal in memory cell 6 also can be one or more.Preferably, reference signal is 0.Certainly, reference signal also can be other values.
Screw 1 also comprises comparing unit 7.Comparing unit 7 equally can Integrated design, also can as other unit of electric connection.Comparing unit 7 for receiving the reference signal in M signal and memory cell 6, and compares it.In other words, comparing unit 7 compares detectable signal after the process of processing unit 5 again with reference signal, and exports comparative result.In the present embodiment, comparative result has two kinds, and a kind of result is that M signal is greater than reference signal, and another result is M signal is not more than reference signal.
In addition, chain saw 1 also comprises control unit 8.The Main Function of control unit 8 controls chain saw 1 on a preset condition based according to the comparative result of comparing unit 7, and export corresponding control signal, thus reach the object that control work package 3 stops cutting work.Particularly, the pre-conditioned M signal for processing unit 5 generation is greater than reference signal.Now, phenomenon that control unit 8 judges that chain saw 1 there occurs " recalcitrating ", control work package 3 when control unit 8 can send control signal, especially cutting element 32 promptly stops cutting work, thus prevent work package 3 from touching user, cause producing injury to user.Control unit 8 sends corresponding control signals work package 3 and stops cutting work can have multiple different mode.Preferred embodiment, the control signal Electronic Control of control unit 8 cuts off the power being supplied to motor 21 to one, and motor 21 can be made like this to quit work very soon.Be beneficial to quitting work fast of work package 3.In another embodiment, chain saw 1 also comprises braking mechanism.There is after braking mechanism is activated the effect to work package 3 fast braking.When control unit 8 phenomenon of judging that chain saw 1 occurs " recalcitrating ", control unit 8 exports the control signal starting braking mechanism, braking mechanism is braked motor 21, thus produces quick out-of-work effect to work package 3.And when M signal is not more than reference signal, control unit 8 judges that " recalcitrating " phenomenon does not occur chain saw 1, control unit 8 also can send the state that corresponding control signal makes work package 3 remain original, such as, proceed cutting work etc.Certainly in various embodiments, control unit 8 also can not send control signal in such cases.In addition, because the motor 21 of chain saw 1 is under idle state, namely work package 3 is in the state of stopping, and the dangerous situation that chain saw 1 can't occur " recalcitrating " etc. hurts sb.'s feelings, therefore under this kind of state, probe unit 4 can't carry out detection operations usually.Certainly, in certain embodiments, probe unit 4 can accomplish real-time detection, whether carries out detection operations and does not depend on whether motor works.
Specifically describe its operation principle and control method below.For convenience of description, adopt two probe units 4 in most preferred embodiment, and these two probe units 4 are equal to the distance of chain saw center of gravity G.Again emphasize it is that the quantity that the present invention does not limit probe unit is 2, also and unrestricted probe unit 4 is symmetrical about center of gravity G.Compared to work package 3, probe unit 4 is closer to the center of gravity G of chain saw.When chain saw 1 produces " recalcitrating " phenomenon, whole chain saw can around center of gravity G quick rotation, counter clockwise direction as shown in Figure 3.So the first probe unit 41 and the second probe unit 42 detect its situation of movement respectively and produce detectable signal, the S1 step namely in Fig. 5.Because the first probe unit 41 and the second probe unit 42 are just in time positioned on the concentric circles of center of gravity G, therefore the detectable signal just in time equal and opposite in direction that detects of the detectable signal that detects of the first probe unit 41 and the second probe unit 42, but due to both angular phase differences just in time 180 degree, so direction is just in time contrary.For example, suppose that the detectable signal that the first probe unit 41 detects is X, then the detectable signal that the second probe unit 42 detects is-X.Then these two result of detections pass to processing unit 5, and processing unit 5 receives laggard row relax result of detection, and exports M signal, i.e. S2 step in Fig. 5.In the present embodiment, processing unit 5 obtains M signal after making vector subtraction to these two detectable signals.Therefore M signal Y=X-(-X)=2X.In that case, interim signal value only has the detectable signal X detected in the prior art of a probe unit in front case, and signal obtains effectively amplifying to be beneficial to suppressing interfering signal or impurity signal.Then comparing unit 7 receives and compares M signal and reference signal, and S3 step in Fig. 5.In the present embodiment, the numerical value of reference signal usually can not be very large, such as, can be X, also can be greater than 0 steady state value.Now because M signal Y=2X is much larger than reference signal, so comparing unit 7 judges that M signal Y is greater than reference signal.So control unit 8 judges to there occurs " recalcitrating " phenomenon.Control unit 8 will send control signal control work package 3 and quit work, i.e. step S5 in Fig. 5.
When chain saw 1 performs other actions and produces displacement, such as integral translation chain saw 1, to facilitate cut workpiece, namely produces as the situation in Fig. 4.Then chain saw still performs S1, S2, S3 step respectively.In the S1 step of the present embodiment, as shown in Figure 5, the detectable signal equal and opposite in direction that the first probe unit 41 and the second probe unit 42 produce, direction is also identical.Suppose that the detectable signal that the first probe unit 41 produces still is X, then the detectable signal that the second probe unit 42 produces also is X.Then in S2 step, processing unit 5 receives and processes, and obtains M signal Y=X-X=0.Therefore, in that case, interim signal value is starkly lower than in front case the detectable signal X of the prior art only having a probe unit.Then in S3 step, comparing unit 7 compares M signal and reference signal, and in the present embodiment, because M signal is 0 or no better than 0, therefore M signal is inevitable much smaller than reference signal, and M signal is not more than reference signal in other words.Therefore according to this comparative result, control unit 8 identifies and " recalcitrating " phenomenon does not occur.Control unit 8 will send control signal and control work package 3 continuation maintenance original state, namely performs step S4.The meaning maintaining original state refers to, if original work package 3 is in the state of stopping, then control unit 8 still makes work package 3 be in the state of stopping.If original work package 3 is in the state of normal cutting work, then control unit 8 still makes work package 3 be in the state of normal cutting work.Due to occur " recalcitrating " phenomenon and there is not " recalcitrating " phenomenon condition under, the size of M signal has obvious difference, and therefore control unit 8 can identify corresponding situation easily, thus substantially increases accuracy, and cost is also lower.
The present invention is not limited to lifted specific embodiment structure, and the structure based on the present invention's design all belongs to scope.
Claims (17)
1. a control method for chain saw, wherein chain saw comprises extending longitudinally and for carrying out cutting work work package, and this control method comprises following rate-determining steps:
Detect the situation of movement of at least two positions on described chain saw and send detectable signal, two positions in wherein said at least two positions are positioned at the both sides of described chain saw center of gravity;
M signal is obtained according to described detectable signal logical operation;
More described M signal and the reference signal preset;
According to comparative result, control described work package on a preset condition based and stop cutting work.
2. control method according to claim 1, is characterized in that: described logical operation comprises carries out vector subtraction to described detectable signal.
3. control method according to claim 1, is characterized in that: be pre-conditionedly greater than described reference signal for described M signal.
4. control method according to claim 3, is characterized in that: control described work package and stop cutting work to comprise controlling motor quitting work.
5. control method according to claim 3, is characterized in that: when described M signal is not more than described reference signal, controls described work package maintenance work.
6. control method according to claim 1, is characterized in that: described two positions are equal to the distance of described center of gravity.
7. control method according to claim 6, is characterized in that: the phase difference of described two positions 180 degree.
8. a chain saw, comprising:
Housing;
Work package, extends longitudinally out described housing;
Motor, is contained in described housing and for driving described work package to carry out cutting work;
At least two probe units, wherein two probe units are separately positioned on the both sides of the center of gravity of described chain saw, for detecting the situation of movement of position and producing detectable signal;
Processing unit, for receiving described detectable signal and producing M signal;
Memory cell, for storing default reference signal;
Comparing unit, for more described M signal and described default reference signal;
Control unit, according to the comparative result of described comparing unit, exports control signal on a preset condition based and stops cutting work to control described work package.
9. chain saw according to claim 8, is characterized in that: described at least two probe units are less than the beeline of described work package to described center of gravity to the distance of described center of gravity.
10. chain saw according to claim 8, it is characterized in that: described probe unit comprises the first probe unit and the second probe unit, described chain saw comprises the front apron arranged near described work package and the back handle arranged away from described work package, described first probe unit is arranged on described front apron, and described second probe unit is arranged on described back handle.
11. chain saws according to claim 8, is characterized in that: described two probe units are equal to the distance of described center of gravity.
12. chain saws according to claim 11, is characterized in that: the phase difference of described two probe unit positions is 180 degree.
13. chain saws according to claim 8, is characterized in that: described M signal obtains after carrying out vector subtraction to described detectable signal.
14. chain saws according to claim 8, is characterized in that: be describedly pre-conditionedly greater than described default reference signal for described M signal.
15. chain saws according to claim 14, is characterized in that: described control signal controls described motor and quits work.
16. chain saws according to claim 14, is characterized in that: described chain saw comprises the braking mechanism braking described motor, and described control signal controls described braking mechanism and brakes described motor.
17. chain saws according to claim 14, is characterized in that: when described M signal is not more than described reference signal, and described control unit controls described work package maintenance work.
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| CN201410201684.1A CN105082261A (en) | 2014-05-13 | 2014-05-13 | Chain saw and control method thereof |
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| CN201410201684.1A CN105082261A (en) | 2014-05-13 | 2014-05-13 | Chain saw and control method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110270717A (en) * | 2018-03-15 | 2019-09-24 | 苏州宝时得电动工具有限公司 | Electric cutting tool |
| WO2020108569A1 (en) * | 2018-11-28 | 2020-06-04 | 南京德朔实业有限公司 | Chainsaw, electric tool, and method for controlling electric tool |
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| US20040181951A1 (en) * | 2003-03-17 | 2004-09-23 | Wittke Edward R. | Chain saw safety system |
| US20100064532A1 (en) * | 2007-07-31 | 2010-03-18 | Edward Raymond Wittke | Chain saw 3D relative positional monitoring and anti-kickback actuation system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110270717A (en) * | 2018-03-15 | 2019-09-24 | 苏州宝时得电动工具有限公司 | Electric cutting tool |
| WO2020108569A1 (en) * | 2018-11-28 | 2020-06-04 | 南京德朔实业有限公司 | Chainsaw, electric tool, and method for controlling electric tool |
| EP3872978A4 (en) * | 2018-11-28 | 2021-12-29 | Nanjing Chervon Industry Co., Ltd. | Chainsaw, electric tool, and method for controlling electric tool |
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