• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a method for detecting an overload of at least one saw blade of a circular saw, in particular a multi-blade circular saw. A sound measurement, in particular airborne sound measurement, of the operating noise of the saw blade is carried out and an alarm is triggered or an intervention in the operation of the circular saw, for example by a when exceeding the sound level in the range of a previously defined frequency range by a predetermined amount for a certain period of time Stopping and retracting the feed, made. The invention further relates to a device for carrying out the method described.
    公开号:AT515112A4
    申请号:T50556/2013
    申请日:2013-09-06
    公开日:2015-06-15
    发明作者:
    申请人:Fellner Wolfgang Ing；
    IPC主号:
    专利说明:

    The invention relates to a method for detecting an overload of at least one saw blade of a circular saw, in particular a multi-blade circular saw, and a device for carrying out this method.
    In circular saws, especially in multi-blade circular saws for sawing logs to boards, it comes in bushy strains constantly faulty blades due to excessive cutting pressure. Bushy trunks cause a characteristic squeaking as the wood moves through the plant if the feed rate is increased too quickly when the denser wood points are hit. In this case, the saw blade, or the entire several saw blades on a shaft comprehensive Einhang in a multi-blade circular saw by the vibrations occurring damage. But these vibrations also lead to a cut offset between saw blades of an upper and lower Einhanges and thus to a poor quality of the cut boards or committee. In most cases, after such an incident, one or more leaves or even the entire suspension must be replaced, resulting in service life and caused by the frequently required saw blade replacement high cost of spare parts.
    So far, such operations were intervened only after hearing of a machine operator in the operation of a circular saw and, for. stopped the feed and the circular saw cleared, which is done by moving the trunk back a small distance, which gives the saw blades time to stabilize and thus any vibrations can subside again.
    However, there is the disadvantage that in a sawmill very many and noisy noise sources are present and it depends very much on the experience and attention of the machine operator, whether damage to the hanging is prevented or not. The response times of a person who has to constantly operate the machine here with high attention are usually far higher than automatic circuits, which systematically leads to a higher wear of the expensive saw blades and suspensions.
    The aim of the invention is to avoid this disadvantage and to provide a method and a device for carrying out the method, which reliably detects excessive swinging of the saw blades and allows timely corrective intervention in the operation of a multi-blade circular saw.
    This is achieved by the characterizing features of claim 1 according to the invention. The proposed method steps ensures that an overload of the leaves, which leads to a marked increase in the operating noise of the multi-blade circular saw in a certain frequency range, reliably detected and appropriate countermeasures can be taken.
    In this context, it is expedient to proceed according to the features of claim 2. This ensures a reliable detection of an overload of the leaves. Thus, it has been found in tests that when the blades are overloaded, they vibrate and a significant increase in the noise in the specified frequency range occurs and such a case of operation can thus be detected very reliably.
    According to the features of claim 3 are proposed. This results in a simple structure with which an overload of the leaves of a multi-blade circular saw can be reliably detected. Depending on the system, the controller may provide either an audible or visual alarm signal for manual intervention by a user and / or automatic intervention to control the circular saw. An intervention in the control of the circular saw, for example, be an automatic stopping of the feed and retraction of the saw blades. The exact frequencies that are detected, as well as the amount and duration of exceeding the sound level in these frequency ranges can be adjusted individually depending on the type of system, as well as the specific intervention in the control of the circular saw.
    According to a further feature of the invention, the features of claim 4 are provided. By continuously measuring the sound levels and comparing them with stored values over a longer period of time, the slow increase in sound level as the blade is worn becomes visible and the data obtained can also be used for more efficient control. Thus, a signal can be output as soon as a saw blade is dull and must be replaced, or can be slowed down by an automatic intervention in the control of the circular saw, for example blunted saw blades, the feed accordingly and thus the life of the saw blades can be increased. This results in a more effective use of each saw blade, which reduces the cost of operating the saw.
    Due to the features of claim 5, on the one hand a protection of the microphone before jumping chips and also results in a directivity of the microphone assembly, so that an omnidirectional microphone can be used and still an influence by other sound sources is largely avoided.
    To protect the microphone from dust and sawdust, the features of claim 5 can be provided. The plug can be changed or cleaned regularly depending on the dust load.
    To capture only the airborne sound, the features of claim 6 can be provided.
    The invention will now be explained in more detail with reference to the accompanying Fig. 1, which shows schematically a multi-blade circular saw with a device according to the invention.
    A multi-blade circular saw 1 has two hooks 2, which are formed by a number of circular saw blades held on a common shaft. A tree trunk 8 is advanced in the direction of the arrow 9 against the hooks 2 and divided by these.
    On a housing of the multi-blade circular saw 1 or in the immediate vicinity of a microphone 3 is arranged, which is arranged in a reverberant funnel 4. In this case, the microphone 3 is mounted sound decoupled.
    To protect against dust and sawdust in the hopper 4, a plug 5 is arranged made of an open-cell foam, which covers the front opening of the funnel 4.
    The microphone 3 is followed by a preamplifier 6, which amplifies the signals of the microphone 3. To evaluate the signals, the preamplifier 6 is followed by a bandpass filter 7, which transmits signals in a bandwidth of about 900 Hz to 4 kHz.
    In an evaluation circuit 10, the filtered signals are examined with regard to an increase in the sound level. When a preset level rise in the measured range is exceeded for a certain period of time, a signal is output to a controller 11 which causes the advancement of the log 8 to be stopped and the latter to travel a certain distance, e.g. 30 to 40 cm is withdrawn. As a result, the oscillations of the circular saw blades of the appendages 2, which occur in an overload of the circular saw blades, decay, after which the tree trunk 8 can be advanced against the traps 2 again.
    Furthermore, the output signals of the evaluation circuit 10 can also be used by a signaling device (not shown), e.g. an optical or acoustic warning device supplied.
    Vienna, September 6, 2013
    权利要求:
    Claims (7)
    [1]
    Dr. Müllner Dipl.-Ing. Katschinka OG, Patent Attorney Office Weihburggasse 9, Postfach 159, A-1014 WIEN, Austria Phone: [+43 (1) 512 24 81 / Fax: a + 43 (1) 513 76 81 / E-Mail: ® repatent@aon.at Account (PSK): 1480 708 BLZ 60000 BIC: OPSKATWW IBAN: AT19 6000 0000 0148 07081 480 708 16/45807 Ing. Wolfgang Fellner GmbH 1220 Vienna (AT) Claims: 1. A method for detecting an overload of at least one saw blade of a circular saw, in particular a multi-blade circular saw, characterized in that a sound measurement, in particular airborne sound measurement, the operating noise of the saw blade is performed and an alarm is triggered or an intervention in the operation when exceeding the sound level in the range of a previously defined frequency range by a predetermined amount for a certain period of time the circular saw, for example by stopping and retracting the feed, is made.
    [2]
    2. The method according to claim 1, characterized in that the increase in the sound level in a predefined frequency range of 900Hz to 4kHz is detected and triggered an increase in the sound level by an amount of at least about 8 to 14dB in this frequency range an alarm and / or is intervened in the operation of the circular saw.
    [3]
    3. A device for carrying out the method according to claim 1 or 2, characterized in that a measuring microphone (3) with the interposition of a bandpass filter (7) with a pass-frequency range of 900Hz to 4kHz a signal rise detecting evaluation circuit (10) is connected downstream, which is in communication with a controller (11) of the circular saw (1) and / or a signaling device.
    [4]
    4. Device according to claim 3, characterized in that the evaluation circuit has a memory which stores the sound level measurements over long periods of time, wherein the stored values of the evaluation circuit are comparable, whereby the wear of the saw blade can be detected by the continuous increase of the sound level.
    [5]
    5. Device according to claim 3 or 4, characterized in that the measuring microphone (3) by a funnel (4) is attenuated, the frequencies less than 900Hz attenuates and amplified between 900Hz and 4KHz and on the saw blade (2) of the circular saw (1 ) is aligned.
    [6]
    6. Device according to one of claims 3 to 5, characterized in that the measuring microphone (3) an open-pored Schaumstoffpfropfen (5) is pre-set.
    [7]
    7. Device according to one of claims 3 to 6, characterized in that the microphone (3) in the hopper (4) is kept vibrationally decoupled. Vienna, September 6, 2013
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    WO1982003589A1|1981-04-13|1982-10-28|Forsgren Roland|Method and apparatus for monitoring the tool status in a tool machine with cyclic machining|
    DE69804982T2|1997-09-22|2002-11-07|Design & Mfg Solutions Inc|DEVICE AND METHOD FOR RECOMMENDING DYNAMICALLY PREFERRED MACHINING SPEEDS|
    DE10057661A1|2000-11-21|2002-06-06|Siemens Ag|Determining saw degree of sharpness involves detecting saw vibration signal during sawing, converting analog sensor signal to digital form and subjecting digitized signal to computer analysis|CN107457609A|2017-08-25|2017-12-12|西安交通大学|Milling parameter suppressing method and milling parameter optimization system based on stiffness variation|DD289732A5|1989-12-04|1991-05-08|Technische Universitaet Chemnitz,Bfs/N,De|CIRCUIT ARRANGEMENT FOR TOOL GROUND, TOOL WEAR AND SPAN FORM MONITORING|
    US5170358A|1990-12-06|1992-12-08|Manufacturing Laboratories, Inc.|Method of controlling chatter in a machine tool|
    KR950005567B1|1992-06-30|1995-05-25|Samsung Electronic Devices|Pannel & driving method of plazma display|
    DE19722937A1|1997-05-23|1998-11-26|Interholz Technik Gmbh|Control system and method for regulating processing speeds in woodworking|
    WO1999031637A1|1997-12-18|1999-06-24|Sentec Corporation|Emergency vehicle alert system|
    JPH11327588A|1998-05-08|1999-11-26|Taguchi Tsushin Kogyo Kk|Alarm device for converting sound alarm into another transmission medium|
    JP2008140037A|2006-11-30|2008-06-19|Matsushita Electric Works Ltd|Working monitoring device|DE102016208002B4|2016-05-10|2019-02-21|Thyssenkrupp Ag|Method and device for detecting errors on rotating knives|
    DE102017007605A1|2017-08-10|2019-02-14|Michael Weinig Ag|Method for separating elongate workpieces and processing machine for carrying out such a method|
    法律状态:
    2020-04-15| PC| Change of the owner|Owner name: PRINZ GMBH, AT Effective date: 20200309 |
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50556/2013A|AT515112B1|2013-09-06|2013-09-06|Method and device for detecting an overload of at least one saw blade of a circular saw|ATA50556/2013A| AT515112B1|2013-09-06|2013-09-06|Method and device for detecting an overload of at least one saw blade of a circular saw|
    EP14183862.3A| EP2845674B1|2013-09-06|2014-09-06|Method for detecting an overload of a saw blade and device for same|
    DK14183862.3T| DK2845674T3|2013-09-06|2014-09-06|Method for detecting an overload of a saw blade and device therefor|
    SI201431762T| SI2845674T1|2013-09-06|2014-09-06|Method for detecting an overload of a saw blade and device for same|
    PL14183862T| PL2845674T3|2013-09-06|2014-09-06|Method for detecting an overload of a saw blade and device for same|
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